Frozen Products

Abstract

A frozen composition is provided which includes hydrophobin. Also provided is the use of hydrophobin in inhibiting ice crystal growth and/or modifying ice crystal habit in frozen food products.

Description

FIELD OF THE INVENTION

[0001] The present invention relates to frozen products that include hydrophobins.

BACKGROUND TO THE INVENTION

[0002] During storage, the ice crystals present in frozen products tend to increase in size as a result of dynamic processes such as recrystallisation. This can lead to poor product characteristics such as poor appearance and unacceptable mouthfeel and/or to product damage. It has been suggested previously to use proteins termed "anti-freeze proteins" (also known as "ice structuring proteins") to inhibit the process of ice recrystallisation.

SUMMARY OF THE INVENTION

[0003] We have found that a class of proteins found in fungi, termed hydrophobins, are also able to inhibit ice crystal growth in frozen products.

[0004] Accordingly, the present invention provides a frozen composition, such as a frozen food product, comprising hydrophobin, preferably hydrophobin in isolated form. In a related aspect, the present invention provides a frozen composition, such as a frozen food product, comprising hydrophobin in a form capable of assembly at an air-liquid surface and a frozen composition, such as a frozen food product, to which hydrophobin in said form has been added.

[0005] Preferably the hydrophobin is a class II hydrophobin.

[0006] In a preferred embodiment, hydrophobin is present in an amount of at least 0.001 wt %, more preferably at least 0.01 wt %.

[0007] In one embodiment, the frozen composition is aerated. In another embodiment, the frozen composition is unaerated.

[0008] In a related aspect, the present invention provides a composition for producing a frozen food product of the invention, which composition comprises hydrophobin, preferably hydrophobin in isolated form, together with at least one of the remaining ingredients of the food product, the composition being in unfrozen form. Preferably the composition comprises all the remaining ingredients of the food product.

[0009] In a related embodiment, the present invention provides a dry composition for producing a frozen food product of the invention, which composition comprises hydrophobin, preferably hydrophobin in isolated form, together with at least one of the remaining non-liquid ingredients of the food product. Preferably the composition comprises all the remaining non-liquid ingredients of the food product.

[0010] The present invention also provides the use of hydrophobin in a method of inhibiting ice crystal growth in a frozen composition. Preferably the hydrophobin is used to inhibit ice recrystallisation.

[0011] In a related aspect, the present invention also provides the use of hydrophobin in a method of modifying ice crystal habit in a frozen composition.

[0012] The present invention further provides a method of inhibiting ice crystal growth, for example ice recrystallisation, in a frozen composition which method comprises adding to the composition hydrophobin prior to and/or during freezing of the composition.

[0013] In a related aspect, the present invention provides a method of modifying ice crystal habit in a frozen composition which method comprises adding to the composition hydrophobin prior to and/or during freezing of the product.

[0014] In a preferred embodiment of the above-described uses and methods, the composition is a frozen food product.

DETAILED DESCRIPTION OF THE INVENTION

[0015] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art (e.g. in chilled confectionery/frozen confectionery manufacture, chemistry and biotechnology). Definitions and descriptions of various terms and techniques used in chilled/frozen confectionery manufacture are found in Ice Cream, 4.sup.th Edition, Arbuckle (1986), Van Nostrand Reinhold Company, New York, N.Y. Standard techniques used for molecular and biochemical methods can be found in Sambrook et al., Molecular Cloning: A Laboratory Manual, 3.sup.rd ed. (2001) Cold to Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y. and Ausubel et al., Short Protocols in Molecular Biology (1999) 4.sup.th Ed, John Wiley & Sons, Inc.--and the full version entitled Current Protocols in Molecular Biology).

Hydrophobins

[0016] Hydrophobins are a well-defined class of proteins (Wessels, 1997, Adv. Microb. Physio. 38: 1-45; Wosten, 2001, Annu Rev. Microbiol. 55: 625-646) capable of self-assembly at a hydrophobic/hydrophilic interface, and having a conserved sequence:

TABLE-US-00001 (SEQ ID No. 1) X.sub.n-C-X.sub.5-9-C-C-X.sub.11-39-C-X.sub.8-23-C-X.sub.5-9-C-C-X.sub.6-- 18-C-X.sub.m

where X represents any amino acid, and n and m independently represent an integer. Typically, a hydrophobin has a length of up to 125 amino acids. The cysteine residues (C) in the conserved sequence are part of disulphide bridges. In the context of the present invention, the term hydrophobin has a wider meaning to include functionally equivalent proteins still displaying the characteristic of self-assembly at a hydrophobic-hydrophilic interface resulting in a protein film, such as proteins comprising the sequence:

TABLE-US-00002 (SEQ ID No. 2) X.sub.n-C-X.sub.1-50-C-X.sub.0-5-C-X.sub.1-100-C-X.sub.1-100-X.sub.1-50-C- -X.sub.0-5- C-X.sub.1-50-C-X.sub.m

or parts thereof still displaying the characteristic of self-assembly at a hydrophobic-hydrophilic interface resulting in a protein film. In accordance with the definition of the present invention, self-assembly can be detected by adsorbing the protein to Teflon and using Circular Dichroism to establish the presence of a secondary structure (in general, .alpha.-helix) (De Vocht et al., 1998, Biophys. J. 74: 2059-68).

[0017] The formation of a film can be established by incubating a Teflon sheet in the protein solution followed by at least three washes with water or buffer (Wosten et al., 1994, Embo. J. 13: 5848-54). The protein film can be visualised by any suitable method, such as labeling with a fluorescent marker or by the use of fluorescent antibodies, as is well established in the art. m and n typically have values ranging from 0 to 2000, but more usually m and n in total are less than 100 or 200. The definition of hydrophobin in the context of the present invention includes fusion proteins of a hydrophobin and another polypeptide as well as conjugates of hydrophobin and other molecules such as polysaccharides.

[0018] Hydrophobins identified to date are generally classed as either class I or class II. Both types have been identified in fungi as secreted proteins that self-assemble at hydrophobilic interfaces into amphipathic films. Assemblages of class I hydrophobins are relatively insoluble whereas those of class II hydrophobins readily dissolve in a variety of solvents.

[0019] Hydrophobin-like proteins have also been identified in filamentous bacteria, such as Actinomycete and Steptomyces sp. (WO01/74864). These bacterial proteins, by contrast to fungal hydrophobins, form only up to one disulphide bridge since they have only two cysteine residues. Such proteins are an example of functional equivalents to hydrophobins having the consensus sequences shown in SEQ ID Nos. 1 and 2, and are within the scope of the present invention.

[0020] The hydrophobins can be obtained by extraction from native sources, such as filamentous fungi, by any suitable process. For example, hydrophobins can be obtained by culturing filamentous fungi that secrete the hydrophobin into the growth medium or by extraction from fungal mycelia with 60% ethanol. It is particularly preferred to isolate hydrophobins from host organisms that naturally secrete hydrophobins. Preferred hosts are hyphomycetes (e.g. Trichoderma), basidiomycetes and ascomycetes. Particularly preferred hosts are food grade organisms, such as Cryphonectria parasitica which secretes a hydrophobin termed cryparin (MacCabe and Van Alfen, 1999, App. Environ. Microbiol 65: 5431-5435).

[0021] Alternatively, hydrophobins can be obtained by the use of recombinant technology. For example host cells, typically micro-organisms, may be modified to express hydrophobins and the hydrophobins can then be isolated and used in accordance with the present invention. Techniques for introducing nucleic acid constructs encoding hydrophobins into host cells are well known in the art. More than 34 genes coding for hydrophobins have been cloned, from over 16 fungal species (see for example WO96/41882 which gives the sequence of hydrophobins identified in Agaricus bisporus; and Wosten, 2001, Annu Rev. Microbiol. 55: 625-646). Recombinant technology can also be used to modify hydrophobin sequences or synthesise novel hydrophobins having is desired/improved properties.

[0022] Typically, an appropriate host cell or organism is transformed by a nucleic acid construct that encodes the desired hydrophobin. The nucleotide sequence coding for the polypeptide can be inserted into a suitable expression vector encoding the necessary elements for transcription and translation and in such a manner that they will be expressed under appropriate conditions (e.g. in proper orientation and correct reading frame and with appropriate targeting and expression sequences). The methods required to construct these expression vectors are well known to those skilled in the art.

[0023] A number of expression systems may be used to express the polypeptide coding sequence. These include, but are not limited to, bacteria, fungi (including yeast), insect cell systems, plant cell culture systems and plants all transformed with the appropriate expression vectors. Preferred hosts are those that are considered food grade--`generally regarded as safe` (GRAS).

[0024] Suitable fungal species, include yeasts such as (but not limited to) those of the genera Saccharomyces, Kluyveromyces, Pichia, Hansenula, Candida, Schizo saccharomyces and the like, and filamentous species such as (but not limited to) those of the genera Aspergillus, Trichoderma, Mucor, Neurospora, Fusarium and the like.

[0025] The sequences encoding the hydrophobins are preferably at least 80% identical at the amino acid level to a hydrophobin identified in nature, more preferably at least 95% or 100% identical. However, persons skilled in the art may make conservative substitutions or other amino acid changes that do not reduce the biological activity of the hydrophobin. For the purpose of the invention these hydrophobins possessing this high level of identity to a hydrophobin that naturally occurs are also embraced within the term "hydrophobins".

[0026] Hydrophobins can be purified from culture media or cellular extracts by, for example, the procedure described in WO 01/57076 which involves adsorbing the hydrophobin present in a hydrophobin-containing solution to surface and then contacting the surface with a surfactant, such as Tween 20, to elute the hydrophobin from the surface. See also Collen et al., 2002, Biochim Biophys Acta. 1569: 139-50; Calonje et al., 2002, Can. J. Microbiol. 48: 1030-4; Askolin et al., 2001, Appl Microbiol Biotechnol. 57: 124-30; and De Vries et al., 1999, Eur J. Biochem. 262: 377-85.

Frozen Compositions

[0027] Frozen compositions/frozen products include frozen food products and frozen biological materials. Frozen food products include frozen plant-derived materials, such as fruit and vegetables, frozen animal-derived materials, such as frozen meat and fish, as well as frozen processed food products, such as ready-made meals, sauces and frozen confections such as ice cream, milk ice, frozen yoghurt, sherbet, slushes, frozen custard, water ice, sorbet, granitas and frozen purees.

[0028] Frozen compositions of the invention can be aerated or unaerated. The term "aerated" means that gas has been intentionally incorporated into the product, such as by mechanical means. The gas is preferably any food-grade gas such as air, nitrogen or carbon dioxide. The extent of aeration, especially in the context of aerated food products, is typically defined in terms of "overrun". In the context of the present invention, % overrun is defined in volume terms as:

((volume of the final aerated product-volume of the mix)/volume of the mix).times.100

[0029] The amount of overrun present in the product will vary depending on the desired product characteristics. For example, the level of overrun in ice cream is typically from about 70 to 100%, whereas the overrun in water ices is from 25 to 30%.

[0030] An unaerated composition, such as a frozen food product, preferably has an overrun of less then 20%, more preferably less than 10%. An unaerated frozen food product is not subjected to deliberate steps such as whipping to increase the gas content. Nonetheless, it will be appreciated that during the preparation of unaerated frozen food products, low levels of gas, such as air, may be incorporated in the product.

Frozen Confectionery Products

[0031] Frozen confections include confections that typically include milk or milk solids, such as ice cream, milk ice, frozen yoghurt, sherbet and frozen custard, as well as frozen confections that do not contain milk or milk solids, such as water ice, sorbet, gravitas and frozen purees.

[0032] The frozen confections may be in the form of a composite product where at least one portion or region of the product, such as a core or layer, does not contain hydrophobin. An example of this would be a product containing a core of ice cream which lacks hydrophobin, coated in a layer of ice cream, milk ice or water ice that does contain hydrophobin. It will be appreciated that in the case of a composite product, the wt % amount of hydrophobin added is calculated solely in relation to those components of the confection that contain hydrophobin and not in relation to the complete product.

[0033] Aerated frozen confections preferably have an overrun of from 25% to 300%, such as from 25% to 150%, more preferably from 50 to 150%.

[0034] The amount of hydrophobin present in the frozen compositions of the invention will generally vary depending on the product formulation and, in the case of aerated products, the volume of the air phase. Typically, the product will contain at least 0.001 wt %, hydrophobin, more preferably at least 0.005 or 0.01 wt %. Typically the product will contain less than 1 wt % hydrophobin. The hydrophobin may be from a single source or a plurality of sources e.g. the hydrophobin can a mixture of two or more different hydrophobin polypeptides.

[0035] Preferably the hydrophobin is class II hydrophobin.

[0036] The present invention also encompasses compositions for producing a frozen food product of the invention, which composition comprises hydrophobin. Generally, the hydrophobin will be in isolated form, typically at least partially purified, such as at least 10% or 20% pure, based on weight of solids. Thus, the hydrophobin is not added as part of a naturally-occurring organism, such as a mushroom, which naturally expresses hydrophobins. Instead, the hydrophobin will typically either have been extracted from a naturally-occurring source or obtained by recombinant expression in a host organism.

[0037] Such compositions include liquid premixes, for example premixes used in the production of frozen confectionery products, and dry mixes, for example powders, to which an aqueous liquid, such as milk or water, is added prior to or during freezing.

[0038] The compositions for producing a frozen food product of the invention, will comprise other ingredients, in addition to the hydrophobin, which are normally included in the food product, e.g. sugar, fat, emulsifiers, flavourings etc. The compositions may include all of the remaining ingredients required to make the food product such that the composition is ready to be processed to form a frozen food product of the invention.

[0039] Dry compositions for producing a frozen food product of the invention will also comprise other ingredients, in addition to the hydrophobin, which are normally included in the food product, e.g. sugar, fat, emulsifiers, flavourings etc. The compositions may include all of the remaining non-liquid ingredients required to make the food product such that all that the user need only add an aqueous liquid, such as water or milk, and the composition is ready to be processed to form a frozen food product of the invention. These dry compositions, examples of which include powders and granules, can be designed for both industrial and retail use, and benefit from reduced bulk and longer shelf life.

[0040] The hydrophobin is added to a composition in a form and in an amount such that it is available to inhibit ice crystal growth, such as ice recrystallisation, and/or modify ice crystal habit. By the term "added", we mean that the hydrophobin is deliberately introduced into the composition for the purpose of taking advantage is of its ability to inhibit ice crystal growth and/or modify ice crystal habit. Consequently, where ingredients are present or added that contain fungal contaminants, which may contain hydrophobin polypeptides, this does not constitute adding hydrophobin within the context of the present invention.

[0041] Typically, the hydrophobin is added to the product in a form that is capable of self-assembly at an air-liquid surface.

[0042] Typically, the hydrophobin is added to the compositions of the invention in an isolated form, typically at least partially purified, such as at least 10% pure, based on weight of solids. By "added in isolated form", we mean that the hydrophobin is not added as part of a naturally-occurring organism, such as a mushroom, which naturally expresses hydrophobins. Instead, the hydrophobin will typically either have been extracted from a naturally-occurring source or obtained by recombinant expression in a host organism.

[0043] The added hydrophobin can be used to reduce or inhibit the growth of ice crystals, for example to inhibit the process of ice recrystallisation, and/or to modify ice crystal habit (i.e. ice crystal shape). Inhibition and/or modification can take place during freezing and or after freezing e.g. during storage. Inhibition of ice crystal growth and/or ice crystal habit during freezing can be used to alter the texture of the product. Inhibition of ice recrystallisation improves product stability in response to thermal abuse.

[0044] Hydrophobins can also be used to inhibit ice crystal growth, such as ice recrystallisation, and/or ice crystal habit in cellular biological materials. This will assist in reducing damage to cells as a result of the freezing processes used to preserve biological materials. Such biological materials include cultures of to unicellular organisms and cell lines; gametes e.g. sperm and ova; and tissue and organs derived from multicellular organisms, both plants and animals.

[0045] Accordingly the present invention also provides a frozen cellular biological material comprising hydrophobin in isolated form, preferably comprising at least 0.001 wt % hydrophobin, with the proviso that human beings are specifically excluded.

[0046] The present invention further provides the use of hydrophobin to inhibit ice crystal growth, such as ice recrystallisation, and/or modify ice crystal habit in a frozen cellular biological material. Inhibition/modification can be during and/or after freezing of the biological material.

[0047] The present invention will now be described further with reference to the following examples which are illustrative only and non-limiting.

DESCRIPTION OF THE FIGURES

[0048] FIG. 1 is a diagram showing shear regimes for the aerated frozen products

[0049] FIG. 2 is a scanning electron micrograph of aerated frozen product microstructures--fresh and after abuse (Magnification .times.100)

[0050] FIG. 3 is a scanning electron micrograph of aerated frozen product microstructures--fresh and after abuse (Magnification .times.300)

[0051] FIG. 4 shows scanning electron micrographs of unaerated product microstructures (no HFBII) (50.times. magnification).

[0052] FIG. 5 shows scanning electron micrographs of unaerated product microstructures (with HFBII) (50.times. magnification).

EXAMPLE 1

Aerated Frozen Products

[0053] Aerated frozen products were prepared using 3 types of protein:

A: Sodium Caseinate (Na Cas)

B: Skimmed Milk Powder (SMP)

[0054] C: Hydrophobin (HFBII) from Trichoderma reesei

[0055] Microstructural and physical properties of the products were compared, both before and after temperature abuse regimes.

Materials

[0056] Details of the materials used are summarised in Table 1 and the formulations from which each of the aerated frozen products was prepared are shown in Table 2.

TABLE-US-00003 TABLE 1 Materials used Ingredient Composition Supplier Sodium caseinate 88-90% protein, 1.5% fat, DMV International, 6% moisture The Netherlands. Skimmed milk 33-36% protein, 0.8% fat, United Milk, UK. powder 3.7% moisture Hydrophobin type II Purified from Trichoderma VTT Biotechnology, (HFB II) reesei essentially as Finland. described in WO00/58342 and Linder et al, 2001, Biomacromolecules 2: 511- 517). Refined Coconut Oil Van den Bergh Foods, Limited Sucrose Tate and Lyle, UK.

TABLE-US-00004 TABLE 2 Formulations used Mix A Mix B Mix C Ingredient Concentration/wt % Sodium caseinate 2.0 -- -- Skimmed milk powder -- 11.42 -- HFB II -- -- 0.2 Coconut Oil 5.0 5.0 5.0 Sucrose 25.0 20.0 25.0 Water 68.0 63.58 69.8

Preparation of the Aerated Frozen Products

Mix (Emulsion) Preparation

[0057] All mixes were made in 100 g batches. For Mixes A and B (containing sodium caseinate and skimmed milk powder, respectively), the protein was combined with the sucrose and dispersed into cold water using a magnetic stirrer. The solution was then heated to 60.degree. C. with stirring and held for 5 minutes before being cooled to 40.degree. C. Molten coconut fat was then added and the aqueous mix immediately sonicated (Branson Sonifer with 6.4 mm tapered tip) for 3 minutes at 70% amplitude with the tip well immersed in the solution. The emulsion was then is cooled rapidly in a -10.degree. C. water bath until the solution temperature was 5.degree. C., to crystallise the fat droplets. The mixes were stored at 5.degree. C. until further use.

[0058] For Mix C (containing HFB II), the sucrose was first dispersed into cold water with stirring. Then, half of the required concentration of HFB II was added to this as an aliquot. The solution was then gently sonicated in a sonic bath for 30 seconds to fully disperse the HFB II. This solution was then stirred on a magnetic stirrer and heated to 40.degree. C. Before the molten fat was added the solution was again sonicated in a sonic bath for 30 seconds. The molten fat was then added and the mix was emulsified and cooled as described for Mixes A and B. A further aliquot of HFB II was then added to this cold solution to bring the HFB II concentration up to 0.2%. The first 0.1% of HFB II was for emulsifying and stabilising the fat. The second addition of HFB II would provide adequate excess HFBII to provide good aeration and foam stability.

[0059] Particle size analysis on the chill emulsions was performed using a Malvern Mastersizer 2000.

Analysis of Emulsions

[0060] Following this methodology, we were able to make emulsions with small fat droplets. A summary of oil droplet sizes measured is shown in Table 3.

TABLE-US-00005 TABLE 3 Emulsion particle size as measured using the Malvern Mastersizer 2000 Fat droplet diameter Mix D(3, 2)/.mu.m A (Na Cas) 0.4 B (SMP) 0.25 C (HFB II) 1.88

Shear Freezing Process

[0061] 80 ml of mix was sheared and frozen simultaneously in a cylindrical, vertically mounted, jacketed stainless steel vessel with internal proportions of 105 mm height and diameter 72 mm. The lid of the vessel fills 54% of the internal volume leaving 46% (180 ml) for the sample. The rotor used to shear the sample consists of a rectangular impeller of the correct proportions to scrape the surface edge of the container as it rotates (dimensions 72 mm.times.41.5 mm). Also attached to the rotor are two semi-circular (60 mm diameter) high-shear blades positioned at a 45.degree. angle to the rectangular attachment. The vessel is surrounded by a jacket through which coolant flows.

[0062] In essence an aerated and frozen prototype is produced as follows: The mix inside the enclosed container is mixed with an impeller at a high shear rate in order to incorporate air. Simultaneously, the coolant flows around the container jacket to cool and freeze the mix. The impeller also scrapes the inside wall, removing the ice that forms there and incorporating this into the rest of the mix. High shear is used to initially aerated the mix, and then the shear rate is slowed in order to allow better cooling and freezing. The shear regimes used for each mix are graphically presented in FIG. 1.

[0063] For the freezing and aeration step with Mixes A and B (containing sodium caseinate and skimmed milk powder, respectively) the coolant (set at -18.degree. C.) was set to circulate from Time=0 minutes. The relatively slow stirring at the start for Mixes A and B allowed for cooling of the mix and generation of some viscosity (via ice formation and incorporation) prior to aeration using higher shear. A short time at high speed incorporated the air and then the speed was stepped down to allow the samples to reach at least -5.degree. C.

[0064] For Mix C (containing HFB II) the pot was chilled to about 5.degree. C. and the sample added and the high shear for aerated started. The coolant (set at -18.degree. C.) was not switched to circulate on until 9 minutes due to the increased time required to generate 100% overrun. Once the coolant was switched on to circulate (at 9 minutes), the same shear-cooling pattern as previous (for A and B) was adopted.

[0065] At the end of the process, overrun was measured and samples (approximately 15 g) were placed into small pots. Each product was cooled further for 10 minutes in a freezer set at -80.degree. C. before being stored at -20.degree. C.

Analysis of Aerated Frozen Products

[0066] All aerated frozen products were stored under two temperature regimes: [0067] (a) -20.degree. C. Subsequent analysis was made within one week of production and we deem this as "fresh" product. [0068] (b) Temperature abused samples were subject to storage at -10.degree. C. for 1 or 2 weeks, and then subsequently stored at -20.degree. C. before analysis.

TABLE-US-00006 [0068] TABLE 4 Process details and product overrun for products prepared from Mixes A, B, and C. Shear time at End product 1200 rpm Overrun temperature Sample min % .degree. C. A (Na Gas) 1 103 -5.3 B (SMP) 1 98 -8 B (SMP) 1 94 -5.6 C (HFB II) 10 75 -5

[0069] Final products were analysed as follows: [0070] Overrun of freshly made product [0071] SEM analysis on fresh and temperature abused product [0072] Melting behaviour on fresh and temperature abused product

Overrun

[0073] The overrun for each of the products is summarised in Table 4. All of the mixes were aeratable and incorporated significant amounts of air.

Microstructural Stability: Methodology

Scanning Electron Microscopy (SEM)

[0074] The microstructure of each products was visualised using Low Temperature Scanning Electron Microscopy (LTSEM). The sample was cooled to -80.degree. C. on dry ice and a sample section cut. This section, approximately 5 mm.times.5 mm.times.10 mm in size, was mounted on a sample holder using a Tissue Tek:OCT.TM. compound (PVA 11%, Carbowax 5% and 85% non-reactive components). The sample including the holder was plunged into liquid nitrogen slush and transferred to a low temperature preparation chamber: Oxford Instrument CT1500HF. The chamber is under vacuum, approximately 10.sup.-4 bar, and the sample is warmed up to -90.degree. C. Ice is slowly etched to reveal surface details not caused by the ice itself, so water is removed at this temperature under constant vacuum for 60 to 90 seconds. Once etched, the sample is cooled to -110.degree. C. ending up the sublimation, and coated with gold using argon plasma. This process also takes place under vacuum with an applied pressure of 10.sup.-1 millibars and current of 6 milliamps for 45 seconds. The sample is then transferred to a conventional Scanning Electron Microscope (JSM 5600), fitted with an Oxford Instruments cold stage at a temperature of -160.degree. C. The sample is examined and areas of interest captured via digital image acquisition software.

Freeze Fracture Transmission Electron Microscopy (TEM)

[0075] A small block, approximately 5 mm.times.3 mm.times.3 mm was cut from the sample on an aluminium plate placed on a bed of dry ice using a cold scalpel. The sample block was mounted vertically in a large `top hat` freeze fracture holder using Tissue-Tek O.C.T Compound (Sakura Finetek, Europe BV). The holder was immediately is placed in the transfer device of the Cressingtion CFE-50 under liquid nitrogen and transferred to the freeze fracture chamber (-180.degree. C.). The sample was fractured with one single blow from the swinging microtome knife, and then etched for 10 minutes at -95.degree. C. The etched surface was rotary shadowed (45.degree.) with platinum/carbon to a thickness of 2 nm then coated with carbon to a thickness of 10 nm. The coated sample was removed from the chamber and transfer device and the metal replica floated off the sample, onto water. The replica pieces were cleaned in chromic acid and washed several times with water before being collected on 400 mesh copper EM grids. The grids were allowed to dry before examination by TEM.

[0076] TEM examination was carried out using a JEOL 1200 EX II microscope operated at 100 KV. Images were obtained using a Bioscan camera and Digital Micrograph software (Gatan Inc).

Microstructural Analysis: Results

[0077] Scanning Electron Microscopy (SEM) was used to examine the microstructure of the fresh and temperature abused frozen products. Representative images can be seen in FIGS. 2 and 3 at different magnifications.

[0078] The results from the fresh samples showed that HFB II containing product (prepared from Mix C) were significantly and surprisingly different to those containing more conventional proteins (i.e. Mix A or B). The different properties observed were: smaller air cells, smaller ice crystals, more angular ice crystals, and slightly more accreted ice crystals. For products A and B, we approximate the ice crystal size in the fresh samples to be 50-100 .mu.m diameter. For product C, we approximate the ice crystal size to be 40-60 .mu.m diameter.

[0079] After temperature abuse the SEM images clearly show that the HFB II containing is product (from Mix C) has retained its original microstructure, i.e. there is relatively little apparent ice crystal and air bubble coarsening. This is the case after 1 and 2 weeks storage at -10.degree. C. However, the prototypes containing Na Cas and SMP (from Mix A and B, respectively) show very severe coarsening of the gas and ice structure under temperature abused at -10.degree. C. after just one week.

[0080] Overall, it is clear that the frozen product made containing HFBII shows much greater stability to temperature abuse than the frozen product made using sodium caseinate or skim milk powder. HFBII has an influence on both air bubble and ice crystal size and stability.

Melting Behaviour: Methodology

[0081] Samples of frozen product were placed on a metal grid at room temperature (20.degree. C.). Differences in the way the products melted, notably shape retention and foam stability, were observed as a function of time.

Melting Behaviour: Results

[0082] These microstructural differences (stable foam and stable ice) had some impact on the melting behavior of the frozen product. The aerated frozen sample made from Mix C (containing HFBII) retained its shape better on melting, compared to the product made with sodium caseinate or skimmed milk powder (i.e. Mixes A and B, respectively).

[0083] As the ice melted and formed water, it flowed through the melting grid. However, for the product with HFBII, much of the foam also remained on the grid with some stable drops of foam observed beneath (data not shown)--neither of these characteristics was observed with the conventional proteins (sodium caseinate and skimmed milk powder). This illustrates the differences in the foam stability between each of the proteins used.

Textural Differences between Products A, B, and C

[0084] Clear differences in texture between the three samples could also be observed after one week storage at -10.degree. C. (i.e. temperature abused samples). On handling the product made using sodium caseinate (A) and skimmed milk powder (B), these were noticed to have a very soft and very flaky texture, which was difficult to cleanly remove from the silicon paper used to line the sample pot. The product made using HFBII (C), on the other hand, was very firm and released from the silicon paper lining the sample pot very cleanly. In other words, the product prepared using HFBII shows much greater stability to temperature abuse on both a microscopic and macroscopic scale than product prepared using sodium caseinate or skim milk powder.

Example 2

Non-Aerated Frozen Products

[0085] Two solutions were prepared, one containing hydrophobin HFBII from Trichoderma reesei, the other not. The compositions of the solutions were as shown in Table 5.

TABLE-US-00007 TABLE 5 Formulations for non-aerated products Sample 1 Sample 2 Ingredient Concentration/wt % HFB II 0 0.1 Xanthan 0.5 0.5 Sucrose 25.0 25.0 Water 74.5 74.4

[0086] The HFBII was supplied by VTT Biotechnology, as described above, and the sucrose by Tate & Lyle. The xanthan was a cold-water dispersible grade (Keltrol RD) supplied by CP Kelco (Atlanta, USA).

Preparation and Analysis of the Non-Aerated Frozen Products

[0087] Both solutions were prepared in 100 g batches. The sucrose/xanthan solution was prepared by adding the required amount of deionised water at room temperature to a dry mixture of sucrose and xanthan. This was then mixed using a magnetic stirrer until the solutes were completely dissolved. In the case of Sample 2, HFBII was then added as an aliquot of a 5.3 mg/ml solution, after which the solution was mixed again on the magnetic stirrer for a further 10 is minutes.

[0088] Freezing of the non-aerated solutions was carried out quiescently (i.e. without simultaneous application of shear). Each solution was used to fill a small petri dish of 8 ml volume. These were then placed within a domestic freezer cabinet at -18.degree. C. for 24 hours, during which period freezing of the samples occurred.

[0089] Following freezing, the microstructure of each sample was analysed by SEM using the same preparation method as described in Example 1.

Microstructural Analysis--Results

[0090] Representative SEM images of each sample at 50.times. magnification can be seen in FIGS. 4 and 5. It can be discerned that the microstructure of the solution containing HFBII (sample 2) is finer and contains ice crystal with smaller characteristic dimensions. For instance, the elongated dendritic structures in sample 1 (FIG. 4) are wider and longer than those seen in sample 2 (FIG. 5). This illustrates the influence of hydrophobin on reducing the ice crystal growth process--resulting in crystals of smaller size.

[0091] The various features and embodiments of the present invention, referred to in individual sections above apply, as appropriate, to other sections, mutatis mutandis. Consequently features specified in one section may be combined with features specified in other sections, as appropriate.

[0092] All publications mentioned in the above specification are herein incorporated by reference. Various modifications and variations of the described methods and products of the invention will be apparent to those skilled in the art without departing from the scope of the invention. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are apparent to those skilled in the relevant fields are intended to be within the scope of the following claims.

Sequence CWU 1

1

214106PRTArtificial SequenceHydrophobin 1Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa1 5 10 15Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 20 25 30Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa65 70 75 80Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 85 90 95Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 100 105 110Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 115 120 125Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 130 135 140Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa145 150 155 160Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 165 170 175Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 180 185 190Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 195 200 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Claims

1-17. (canceled)

18. A frozen food product comprising a frozen continuous oil in water emulsion, including dairy protein, fat, sugar and at least 0.01 wt % but less than 1.0 wt % of a class II hydrophobin in isolated form, wherein the hydrophobin is present in an amount effective to inhibit ice crystal growth in the oil in water emulsion when the temperature of the frozen product is maintained at -10 degrees C. for two weeks.

19. The frozen composition of claim 18 wherein the hydrophobin is a class II hydrophobin which can be obtained from Trichoderma reesei.

20. The frozen composition of claim 18 which is unaerated.

21. The frozen composition of claim 18 which is a food product.

22. The frozen food product of claim 22 which is a frozen confectionery product.

23. A composition for producing the frozen food product of claim 21, which composition comprises hydrophobin in isolated form together with the remaining 25 ingredients of the food product, the composition being in unfrozen form.

24. A dry composition for producing the frozen food product of claim 21, which composition comprises hydrophobin in isolated form together with the remaining non-liquid ingredients of the food product.

25. A method of inhibiting ice crystal growth in a frozen composition which method comprises adding hydrophobin to the composition prior to, or during, freezing.

26. The method of claim 26 wherein the frozen composition is a food product.

27. A method of modifying ice crystal habit in a frozen composition which method comprises adding hydrophobin to the composition prior to, or during, freezing.

28. The method of claim 28 wherein the frozen composition is a food product.

29. A method of improving the temperature tolerance of a frozen composition which method comprises adding hydrophobin to the composition prior to, or during, freezing.

30. The method of claim 30 wherein the frozen composition is a food product.

31. The frozen composition according to claim 24 wherein said food product is selected from the group including water ice, slushes, sorbet, granitas, and frozen purees.

32. The dry composition according to claim 25 wherein said food product is selected from the group including water ice, slushes, sorbet, granitas, and frozen purees.

33. The method according to claim 26 wherein said food product is selected from the group including water ice, slushes, sorbet, granitas, and frozen purees.

34. The method according to claim 28 wherein said food product is selected from the group including water ice, slushes, sorbet, granitas, and frozen purees.

35. The method according to claim 30 wherein said food product is selected from the group including water ice, slushes, sorbet, granitas, and frozen purees.

36. The composition according to claim 29 wherein said hydrophobin is one which can be obtained from Trichoderma reesei.

37. The composition according to claim 18 wherein said hydrophobin is HFBII.