EP2782459A1 - Emulsified food product containing egg protein and iron - Google Patents
Emulsified food product containing egg protein and ironInfo
- Publication number
- EP2782459A1 EP2782459A1 EP12783591.6A EP12783591A EP2782459A1 EP 2782459 A1 EP2782459 A1 EP 2782459A1 EP 12783591 A EP12783591 A EP 12783591A EP 2782459 A1 EP2782459 A1 EP 2782459A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- food product
- iron
- emulsified
- egg
- fatty acids
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 102000002322 Egg Proteins Human genes 0.000 title claims abstract description 105
- 108010000912 Egg Proteins Proteins 0.000 title claims abstract description 105
- 235000013305 food Nutrition 0.000 title claims abstract description 90
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 85
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 42
- -1 iron ions Chemical class 0.000 claims abstract description 38
- 235000020660 omega-3 fatty acid Nutrition 0.000 claims abstract description 33
- 239000003921 oil Substances 0.000 claims abstract description 32
- 229940012843 omega-3 fatty acid Drugs 0.000 claims abstract description 31
- 239000006014 omega-3 oil Substances 0.000 claims abstract description 29
- 235000019197 fats Nutrition 0.000 claims abstract description 28
- 102100027992 Casein kinase II subunit beta Human genes 0.000 claims abstract description 26
- 101710158100 Casein kinase II subunit beta Proteins 0.000 claims abstract description 26
- 108010052522 livetin Proteins 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 59
- 235000010746 mayonnaise Nutrition 0.000 claims description 50
- 239000008268 mayonnaise Substances 0.000 claims description 47
- 210000002969 egg yolk Anatomy 0.000 claims description 40
- 230000008569 process Effects 0.000 claims description 38
- 235000013345 egg yolk Nutrition 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 20
- 102000004169 proteins and genes Human genes 0.000 claims description 20
- 108090000623 proteins and genes Proteins 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 18
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- 230000003647 oxidation Effects 0.000 claims description 16
- 238000007254 oxidation reaction Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
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- 102000008133 Iron-Binding Proteins Human genes 0.000 description 16
- 108010035210 Iron-Binding Proteins Proteins 0.000 description 16
- QCVGEOXPDFCNHA-UHFFFAOYSA-N 5,5-dimethyl-2,4-dioxo-1,3-oxazolidine-3-carboxamide Chemical compound CC1(C)OC(=O)N(C(N)=O)C1=O QCVGEOXPDFCNHA-UHFFFAOYSA-N 0.000 description 15
- 235000014103 egg white Nutrition 0.000 description 15
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 14
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
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- OEUUFNIKLCFNLN-LLVKDONJSA-N chembl432481 Chemical class OC(=O)[C@@]1(C)CSC(C=2C(=CC(O)=CC=2)O)=N1 OEUUFNIKLCFNLN-LLVKDONJSA-N 0.000 description 5
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- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 3
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- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
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- 206010013911 Dysgeusia Diseases 0.000 description 2
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- BZQFBWGGLXLEPQ-REOHCLBHSA-N phosphoserine Chemical group OC(=O)[C@@H](N)COP(O)(O)=O BZQFBWGGLXLEPQ-REOHCLBHSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 150000004804 polysaccharides Chemical class 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000473 propyl gallate Substances 0.000 description 1
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- 229940075579 propyl gallate Drugs 0.000 description 1
- 239000003531 protein hydrolysate Substances 0.000 description 1
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- 239000001384 succinic acid Substances 0.000 description 1
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- 239000006228 supernatant Substances 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 235000010384 tocopherol Nutrition 0.000 description 1
- 229960001295 tocopherol Drugs 0.000 description 1
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- 239000011732 tocopherol Substances 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
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- A21D—TREATMENT, e.g. PRESERVATION, OF FLOUR OR DOUGH, e.g. BY ADDITION OF MATERIALS; BAKING; BAKERY PRODUCTS; PRESERVATION THEREOF
- A21D2/00—Treatment of flour or dough by adding materials thereto before or during baking
- A21D2/08—Treatment of flour or dough by adding materials thereto before or during baking by adding organic substances
- A21D2/24—Organic nitrogen compounds
- A21D2/26—Proteins
- A21D2/261—Animal proteins
- A21D2/262—Animal proteins from eggs
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
- A23C9/00—Milk preparations; Milk powder or milk powder preparations
- A23C9/152—Milk preparations; Milk powder or milk powder preparations containing additives
- A23C9/1526—Amino acids; Peptides; Protein hydrolysates; Nucleic acids; Derivatives thereof
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
- A23G9/00—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor
- A23G9/32—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor characterised by the composition containing organic or inorganic compounds
- A23G9/325—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor characterised by the composition containing organic or inorganic compounds containing inorganic compounds
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L15/00—Egg products; Preparation or treatment thereof
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
- A23L2/52—Adding ingredients
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
- A23L27/60—Salad dressings; Mayonnaise; Ketchup
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
- A23L29/10—Foods or foodstuffs containing additives; Preparation or treatment thereof containing emulsifiers
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
- A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
- A23L33/115—Fatty acids or derivatives thereof; Fats or oils
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
- A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
- A23L33/16—Inorganic salts, minerals or trace elements
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
- A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
- A23L33/17—Amino acids, peptides or proteins
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L35/00—Food or foodstuffs not provided for in groups A23L5/00 – A23L33/00; Preparation or treatment thereof
- A23L35/10—Emulsified foodstuffs
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- A—HUMAN NECESSITIES
- A21—BAKING; EDIBLE DOUGHS
- A21D—TREATMENT, e.g. PRESERVATION, OF FLOUR OR DOUGH, e.g. BY ADDITION OF MATERIALS; BAKING; BAKERY PRODUCTS; PRESERVATION THEREOF
- A21D2/00—Treatment of flour or dough by adding materials thereto before or during baking
- A21D2/08—Treatment of flour or dough by adding materials thereto before or during baking by adding organic substances
- A21D2/14—Organic oxygen compounds
- A21D2/16—Fatty acid esters
- A21D2/165—Triglycerides
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
- A23C9/00—Milk preparations; Milk powder or milk powder preparations
- A23C9/152—Milk preparations; Milk powder or milk powder preparations containing additives
- A23C9/1522—Inorganic additives, e.g. minerals, trace elements; Chlorination or fluoridation of milk; Organic salts or complexes of metals other than natrium or kalium; Calcium enrichment of milk
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2200/00—Function of food ingredients
Definitions
- This invention relates to an emulsified food product and a process for preparing an emulsified food product.
- the invention relates to an EDTA-free mayonnaise, and the use of egg proteins, for example livetin or phosvitin, to stabilise mayonnaise against the degradative effects of iron ions present in the mayonnaise.
- egg proteins for example livetin or phosvitin
- E385 E number on the product packaging, and this is recognised by consumers as an additive that is non-natural and so can influence purchasing decisions.
- Mayonnaise products contain unsaturated fatty acids, especially omega-3 fatty acids, many of which are polyunsaturated acids. These compounds decompose on storage through oxidation catalysed by trace amounts of iron ions to give the undesirable off-notes. Iron is naturally present in egg yolk and so the presence of iron is unavoidable in any food product containing egg yolk.
- EDTA is a well-known chelating agent and is added to bind the iron ions making them unavailable for catalysing the oxidation of unsaturated fatty acids. The fatty acids are therefore stabilised and the off-notes are minimised or prevented altogether.
- EDTA is the only solution known for inhibiting the formation of fishy and rancid off- notes in mayonnaises having a content high in omega-3 fatty acids. Its use can extend the shelf-life of such mayonnaise products from, for example, 1 month to 9 months.
- Some food products are known that rely on additives other than EDTA to stabilise unsaturated fatty acids.
- additives other than EDTA may be traditional phenolic synthetic antioxidants, e.g. BHA (butylated hydroxyanisole), BHT (butylated hydroxytoluene), TBHQ (tert- butylhydroquinone), and propyl gallate, or natural antioxidants, e.g. green tea extract (which has a high content of catechins and polyphenolic), rosemary extracts (which are rich in phenolic diterpenes) and tocopherol extracts (which are derived from soya oil).
- Citric acid and certain sulphites are also used in some mayonnaise products.
- Different classes of molecules are potential natural metal-chelators including flavonoids, polyphenols, proteins, peptides and polysaccharides.
- Proteins have been widely reported to be efficient in delaying metal-catalysed lipid oxidation in emulsions. The mechanism of protection depends on the location of the protein in the emulsion system. When adsorbed at the oil/water interface, proteins can repel iron electrostatically and thus reduce interactions between iron and lipid hydroperoxides (Kellerby et al., Journal of Agricultural and Food Chemistry, 2006, 54, 7879-7884). When present in the aqueous phase, proteins can bind to the iron, with caseinate for example, having better chelating activity than whey proteins (Faraji et al., Journal of Agricultural and Food
- Milk proteins and peptides are known to have good antioxidant properties (Elias et al., Critical Reviews in Food Science and Nutrition, 2008, 48, 430-441 ). This is mainly attributed to the presence of phosphoserine amino acid residues, which can bind to metal ions.
- casein phosphopeptides can inhibit the oxidation of corn oil emulsions at acidic and neutral pH (Diaz et al. , Journal of Agricultural and Food Chemistry, 2003, 51 , 2365-2370).
- Casein hydrolysates are also excellent inhibitors of lipid oxidation in emulsions because they have both metal-chelating and radical-scavenging properties (Diaz et al., Journal of
- Egg yolk is a good source of natural antioxidants. Egg yolk granules have been reported to significantly delay the oxidation of linoleate emulsions (Yamamoto et al.,
- the egg yolk protein phosvitin can chelate iron and copper ions, and it can inhibit iron-catalysed oxidation of phospholipid emulsions if a 1 :30 phosvitin:iron ratio is used (Lu and Baker, Poultry
- Iron chelation can also be achieved using partially hydrolyzed egg white proteins (WO 2000/051447). These complexes are sufficiently stable to be used in food applications.
- US patent application 12/642,223 describes one way to avoid the addition of EDTA to food products which would otherwise develop an unpleasant taste or aroma through lipid oxidation.
- the method involves preparing an iron-reduced egg yolk. Iron and phosvitin are extracted from the egg yolk. The iron is removed from the phosvitin and the phosvitin is then added back to the egg yolk. A mayonnaise containing no iron can then be prepared from this egg yolk. This method is, however, time consuming and complicated, which is unlikely to be economically viable for mayonnaises and similar food products.
- the object of the present invention is to improve the state of the art and to provide improved ways of producing emulsified food products having a source of iron and varying levels and types of unsaturated fatty acids, and especially of omega-3 fatty acids; which are resistant to oxidation, decomposition and spoilage; which have a prolonged shelf-life making them useful to be used as an industrial food product; which do not develop an off-taste and/or off-flavour upon storage or extended shelf-life; and which yet do not contain EDTA or other non-natural chelating agents for binding with iron.
- An object of the present invention is therefore to provide an emulsified food product that at least goes part way to overcoming one or more of the above disadvantages of existing products, or at least to provide a useful alternative.
- a shelf-stable emulsified food product comprising:
- oil and/or fat which contains at least 0.5 wt% omega-3 fatty acids per total of the emulsified food product
- the food product contains no EDTA (ethylenediaminetetraacetic acid).
- EDTA ethylenediaminetetraacetic acid
- the food product of the invention comprises at least 0.8 wt% omega-3 fatty acids, preferably at least 1.2 wt%, more preferably at least 2.0 wt%, or even more preferably at least 4.0 wt% omega-3 fatty acids calculated as to total weight of the emulsified food product.
- the food product preferably comprises at least 1 %, more preferably at least 5 %, and even more preferably at least 10 %, by weight oil and/or fat.
- the oil and/or fat preferably contains at least 0.1 %, more preferably at least 1 %, and even more preferably at least 5 %, by weight of omega-3 fatty acids.
- the oil and/fat contains 8 to 12 % by weight omega-3 fatty acids.
- the oil and/fat contains 20 to 40 % by weight omega-3 fatty acids.
- the food product comprises 15 to 35 % by weight oil and/or fat. In other embodiments, the food product comprises 70 to 85 % by weight oil and/or fat.
- the food product comprises 0.1 to 3 % by weight of egg protein. It is also preferred that the food product comprises at least 20 ppm iron ions, preferably at least 50 ppm iron ions.
- the egg protein is preferably a phosphorylated protein, for example phosvitin.
- the egg protein may also be livetin or yolk soluble protein or yolk albumin.
- the food product may comprise egg yolk, which may be fresh egg yolk or powdered egg yolk.
- the egg yolk is preferably present in the amount of at least 1 % by weight.
- the food product is a mayonnaise, salad dressing, beverage, creamer, infant formula, baby food, dairy product, cereal products, functional drink, or pet food.
- EDTA ethylenediaminetetraacetic acid
- oil and/or fat contains at least 0.5 wt% omega-3 fatty acids calculated per total of the emulsified food product.
- the egg protein is a phosvitin or a livetin.
- the process may further comprise mixing an acidifier with components a) to d).
- the acidifier is mixed with components b) to c), and then a) is added and emulsified.
- components b) and c) are mixed together, then the acidifier is added and mixed, and then a) is added and emulsified.
- components b) and c) are mixed together, then a) is added and emulsified, and then the acidifier is added and mixed.
- the invention relates to a use of an egg protein in an emulsion comprising an oil and/or fat containing at least 0.5 wt% omega-3 fatty acids per total of the emulsion, at least 10 ppm iron ions and water, for preventing or retarding oxidation of the omega-3 fatty acids upon storage of the emulsion.
- storage is for at least 1 months at refrigerated or room-temperature, more preferably for at least 4 months or at least 9 months under refrigerated or room-temperature conditions.
- FIGURE 1 shows the iron binding activity of phosvitin and livetin in water compared with EDTA.
- Figure 2 shows the effect of process on iron binding activity of phosvitin at acidic pH.
- Figure 3 shows the iron binding activity of livetins at acidic pH.
- Figure 4 shows the iron binding activity of defatted egg yolk.
- shelf-stable as it relates to the emulsified food product of this invention means that the food product can be safely stored in a sealed container at room or ambient temperature for a useful and reasonably long period of time without an organoleptic degradation. Particularly, this period of time or shelf-life is long enough to make an industrial production feasible, to allow commercial distribution and reasonable storage time of the product at a distributor and also at a consumer's home. Typically, such a shelf-life period is at least 1 month as from the production date and can extend for 9 months or even longer.
- emulsified as it relates to the food product of this invention means oil droplets dispersed in a water matrix, i.e. an oil-in-water emulsion.
- omega-3 fatty acid means an unsaturated fatty acid having a double bond starting after the third carbon atom from the end (known as the omega end) of the carbon chain.
- iron ions refers to Fe 2+ or Fe 3+ or any combination thereof.
- protein means a combination of chemically bound amino acid residues, and includes peptides, hydrolysed proteins, and any protein or peptide fragment.
- the term "acidifier” means any ingredient that is used to decrease pH, and also may be referred to as acid, acidity regulator, acidic buffering agent, pH adjusting agent etc.
- the acidifier used in this invention may be, but is not limited to, vinegar, mustard, citric acid, lemon juice, acetic acid, hydrochloric acid, phosphoric acid, malic acid, lactic acid, ascorbic acid, tartaric acid, fumaric acid, alginic acid, or succinic acid.
- livetin refers to the serum proteins or the water-soluble protein fraction of egg yolk or yolk albumin, and may comprise any one or more of olivetin (serum albumin), ⁇ - livetin (oglycoprotein) and ⁇ -livetin (serum ⁇ -globulin or immunoglobulin Y).
- phosvitin refers to the protein fraction present as lipoprotein in native egg yolk granules, and comprises one or both of a-phosvitin and ⁇ -phosvitin.
- the invention provides an emulsified food product comprising oil and/or fat (at least 0.5 wt% as of the total product is omega-3 fatty acids), egg protein in the amount of 0.05 to 5 % by weight, and iron ions in the amount of at least 10 ppm, wherein there is no EDTA in the food product.
- oil and/or fat at least 0.5 wt% as of the total product is omega-3 fatty acids
- egg protein in the amount of 0.05 to 5 % by weight
- iron ions in the amount of at least 10 ppm
- iron is a known catalyst for a range of chemical processes, one of which is the oxidation of unsaturated fatty acids.
- omega-3 fatty acids in particular are oxidised, fishy and rancid flavours and aromas are commonly recognised by consumers.
- omega-3 fatty acids in particular are oxidised, fishy and rancid flavours and aromas are commonly recognised by consumers.
- omega-3 fatty acids in particular are oxidised, fishy and rancid flavours and aromas are commonly recognised by consumers.
- omega-3 fatty acids in particular are oxidised, fishy and rancid flavours and aromas are commonly recognised by consumers.
- the common method for doing this is to add a food grade chelating agent, such as EDTA, that will bind to the iron ions thereby inactivating the omega-3 fatty acid oxidation process.
- egg protein can be included as an ingredient in emulsified food products to bind the iron ions present such that the addition of EDTA is not needed.
- the egg protein used may be any such protein capable of binding iron ions.
- phosphorylated egg proteins or egg proteins containing glutamine, glutamic acid, asparagine, aspartic acid, cysteine or methionine amino acid residues are preferred.
- the phosphate groups, glutamic acid, aspartic acid, cysteine or methionine residues are thought to be necessary for binding with the iron ions.
- Livetins and phosvitins are the preferred egg proteins of the invention.
- Binding of iron to egg proteins at neutral pH can be achieved with a one-step process by directly mixing the iron ions with the egg protein.
- the iron-binding activity of egg proteins is significantly reduced and complexes do not form when mixing the iron ions and the egg protein directly. It is known that, at least in the case of phosvitin, iron-binding activity is strongly dependent on pH and ionic strength. The maximum iron-binding activity is obtained at neutral pH and low ionic strength.
- the inventors have found that a two-step process, including pre-mixing of the egg protein with iron ions at neutral pH, followed by acidification to acidic pH, was necessary to allow complexation of iron ions by the egg protein and a much higher iron-binding activity than the standard one-step process.
- the food product of the invention contains oil or fat. It is not important whether the product contains oil or contains fat, or a combination of the two.
- the food product preferably comprises at least 1 %, more preferably at least 5 %, and even more preferably at least 10 %, by weight oil and/or fat.
- the oil and/or fat component of the food product contains at least some omega-3 fatty acids, preferably at least 0.1 %, more preferably at least 1 %, and even more preferably at least 5 %.
- the oil and/fat contains 8 to 12 % by weight omega-3 fatty acids, which is typical of products containing rapeseed oil.
- the oil and/fat contains 20 to 40 % by weight omega-3 fatty acids, which is typical of products containing fish oil.
- omega-3 fatty acids may be, but are not limited to, any of the nutritionally important fatty acids olinolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA), all of which are
- the amount of oil and/or fat in the food product may vary considerably.
- a salad dressing or a low-fat mayonnaise may contain 15 to 35 % by weight oil and/or fat
- a full-fat mayonnaise may contain 70 to 85 % by weight oil and/or fat.
- the egg protein may be any protein obtained from egg yolk or egg white, provided that it does give the desired benefit, i.e. interacts with iron or unsaturated fatty acids in some way to prevent or minimise the production of fishy off-notes. While not limiting to any particular theory, it is considered that the egg protein binds in some manner (e.g. by chelation or complexation) to iron ions present and therefore renders them inactive to catalysing oxidation of the unsaturated fatty acids.
- the egg protein is preferably a phosphorylated protein or preferably contains glutamine, glutamic acid, asparagine, aspartic acid, cysteine or methionine amino acid residues. It is thought that the phosphate groups and the above amino acid residues aid the binding of iron.
- the most preferred proteins of the invention are phosvitins and livetins.
- the egg protein may be incorporated into the food product using egg yolk or egg white itself, or may be incorporated in the form of an extract from egg yolk or egg white.
- the egg yolk or egg white may be fresh (i.e. viscous liquid) or may be in powdered form.
- the food product may be any emulsified food product that contains omega-3 fatty acids and iron ions and therefore where there is a need to minimise or prevent the formation of fishy off-notes.
- Particularly suited products are mayonnaise, salad dressing, various beverages, creamer, infant formula, baby food, dairy products such as yoghurt and ice cream, cereal products, functional drinks, and pet food.
- the products may be full-fat or reduced-fat products, e.g. low fat mayonnaise.
- the method of preparation of the food product of the invention can have an impact on the effectiveness of the egg protein for countering the effect of the iron ions on the fatty acids.
- the egg protein may be mixed with an ingredient inherently containing iron ions before oil addition and emulsification.
- This process is particularly suited for neutral pH food products.
- an acidifier may be mixed with the egg protein and the iron source before the addition of oil and emulsification.
- the egg protein may first be mixed with an ingredient already containing iron ions, and then an acidifier may be added.
- the oil may be added and emulsified either before or after addition of the acidifier.
- the two-step process is particularly suited to acid pH products (e.g.
- This two-step process is also especially suited to egg yolk or egg white peptides, which may have very low effectiveness in the food product if prepared in a one-step process but a higher effectiveness if prepared using the two-step process.
- Those skilled in the art will understand that they can freely combine all features of the present invention disclosed herein. In particular, features described for the product of the present invention may be combined with the process of the present invention, and vice versa. Further, features described for different embodiments of the present invention may be combined.
- Example 1 Iron binding activity of phosvitin and livetin compared to EDTA
- Livetins (or water soluble proteins) were extracted from egg yolk as follows:
- Pasteurized egg yolk (400g) and acidified water (3600g, pH 2.85) were mixed for 5 min.
- the pH was adjusted to 5.2 with 1 M hydrochloric acid, and the solution was stirred for 5 min.
- the egg solution was left for 6 hours at 4 °C and stirred again for 5 min.
- the solution was then centrifuged for 25 min at 10000 g and 4 °C. The supernatant was collected (3585 g) and freeze-dried.
- Phosvitin from egg yolk was obtained from Sigma (product number: P1253).
- Different EDTA solutions (5-50 ⁇ ) were prepared by dissolving 10 mg EDTA in 100 ml Millipore water, and further dilution of this 0.34 mM solution to obtain lower EDTA concentrations.
- the different egg protein solutions (1-50 ⁇ ) were prepared by dissolving some protein sample in 100 ml Millipore water and mixing for 1 hour.
- a 0.5 mM iron chloride solution was prepared by dissolving 13 mg in 200 ml Millipore water.
- Iron calibrating solutions were prepared by several dilution of the above solution.
- a 1 mM ferrozine solution was prepared by dissolving 25 mg of ferrozine in 50 ml in Millipore water.
- the iron calibration was performed by mixing 135 ⁇ Millipore water and 30 ⁇ of the above iron chloride solutions.
- the iron-chelator complexes were prepared by mixing 135 ⁇ of EDTA or egg protein solutions at different concentrations and 30 ⁇ of 0.5 mM iron chloride solution for 20 min at 26 °C.
- the free iron was measured by addition of 150 ⁇ of 1 mM ferrozine to the solutions, stirring during 5 min at 26 °C, and measurement of the absorbance of the solutions at 562 nm using a UV/Vis-Spectrometer with microplate reader (Varioskan Flash).
- Blank samples EDTA and egg protein without iron
- Blank samples were prepared replacing 30 ⁇ of 0.5 mM iron chloride solution with 30 ⁇ of Millipore water in the procedure described above.
- the absorbance value of the blank sample (without iron) was deducted from the reading of the sample (with iron).
- Figure 1 shows that when the concentration of phosvitin or livetin increases, the concentration of bound iron ions increases in water, up to a maximum value (50 ⁇ ) corresponding to binding of all iron ions present in solution. Phosvitin and livetins bind more iron ions than EDTA at the same concentration and are thus more efficient iron-chelators.
- Example 2 Effect of process on iron binding activity of phosvitin at acidic pH
- a 0.1 M acetate buffer solution was prepared by mixing 463 ml of a 0.2 M acetic acid solution (5.7 ml glacial acetic acid in 494.3 ml Millipore water) with 37 ml of a 0.2 M acetate solution (1 .64 g anhydrous sodium acetate with 98.36 g of Millipore water).
- the pH of the 0.1 M acetate buffer solution was 3.6 ⁇ 0.1 .
- the different egg protein solutions (1-50 ⁇ ) were prepared by dissolving some protein sample in 100 ml of 0.1 M acetate buffer solution and mixing for 1 hour.
- a 0.5 mM iron chloride solution was prepared by dissolving 13 mg in 200 ml of 0.1 M acetate buffer solution. Iron calibrating solutions were prepared by several dilution of the above solution. A 1 mM ferrozine solution was prepared by dissolving 25 mg of ferrozine in 50 ml 0.1 M acetate buffer solution.
- the iron calibration was performed by mixing 135 ⁇ of 0.1 M acetate buffer solution and 30 ⁇ of the above iron chloride solutions.
- the iron-chelator complexes were prepared by mixing 135 ⁇ of egg protein solutions at different concentrations and 30 ⁇ of 0.5 mM iron chloride solution for 20 min at 26 °C.
- the free iron was measured by addition of 150 ⁇ of 1 mM ferrozine to the solutions, stirring during 5 min at 26 °C, and measurement of the absorbance of the solutions at 562 nm using a UVA is-Spectrometer with microplate reader (Varioskan Flash). All samples were analysed in quadruplicate.
- Blank samples (egg protein without iron) were prepared replacing 30 ⁇ of 0.5 mM iron chloride solution with 30 ⁇ of 0.1 M acetate buffer solution in the procedure described above. The absorbance value of the blank sample (without iron) was deducted from the reading of the sample (with iron).
- a 0.2 M acetate buffer solution was prepared by mixing 463 ml of a 0.4 M acetic acid solution (1 1.4 ml glacial acetic acid in 488.6 ml Millipore water) with 37 ml of a 0.4 M acetate solution (3.28 g anhydrous sodium acetate with 96.72 g of Millipore water) and 500 ml of Millipore water.
- the pH of the 0.2 M acetate buffer solution was 3.6 ⁇ 0.1 .
- the different egg protein solutions (10-200 ⁇ ) were prepared by dissolving some protein powder in Millipore water different concentrations and mixing for 1 hour.
- a 18 mM iron chloride solution was prepared by dissolving 231 mg in 100 ml of 0.1 M acetate buffer solution.
- a 1 mM ferrozine solution was prepared by dissolving 25 mg of ferrozine in 50 ml 0.1 M acetate buffer solution.
- Iron calibrating solutions (10-100 ⁇ ) were prepared in 0.1 M acetate buffer (following the method described for the one-step process).
- the iron-chelator complexes were prepared by mixing 25 ml of the above egg protein solutions with 0.25 ml of 18 mM iron chloride solution for 20 min. Acidification was performed by addition of 25 ml of pH 3.6 0.2 M acetate buffer. The free iron was measured by addition of 150 ⁇ of 1 mM ferrozine to 165 ⁇ of iron-chelator solutions, stirring during 5 min at 26 °C, and measurement of the absorbance of the solutions at 562 nm using a UVA is- Spectrometer with microplate reader (Varioskan Flash). All samples were analysed in quadruplicate.
- Blank samples egg protein without iron were prepared replacing 0.25 ml of 18 mM iron chloride solution with 0.25 ml of Millipore water in the procedure described above. The absorbance value of the blank sample (without iron) was deducted from the reading of the sample (with iron).
- the final iron-protein solutions all contained acetate buffer (pH 3.6, 0.1 M).
- Figure 2 shows that the iron-binding activity of phosvitin depends on the method of preparation of the complexes.
- the iron-binding activity is higher when the iron ions and the phosvitin are pre-mixed at neutral pH before acidification with pH 3.6 acetate buffer, compared to when they are directly mixed in pH 3.6 acetate buffer.
- Iron— livetin complexes were prepared at neutral pH according to the method described in Example 1 , and at acidic pH according to the one-step process described in Example 2.
- FIG. 3 shows that livetins surprisingly do not lose any iron-bonding activity at pH 3.6 in acetate buffer, in contrast to phosvitin.
- the iron-chelating activity of livetins at acidic pH is very similar to that at neutral pH, i.e. all iron ions are bound with 33 ⁇ livetins.
- Livetins are an efficient iron-chelator at acidic pH, more efficient than the highly phosphorylated phosvitin.
- Example 4 Defatted egg yolk (yolk protein powder).
- Yolk protein powder was prepared as follows: Pasteurized egg yolk was mixed with 2 volumes of (3:1 ) hexane:ethanol. The mixture was stirred for 3 hours and filtered under vacuum on a Buchner funnel (Paper filter S&S N° 595, diameter 1 1 cm, retention 4-7 ⁇ ). The sediment was then collected and dried at room temperature overnight.
- Iron-egg protein complexes were prepared at neutral pH according to the method described in Example 1 , and at acidic pH according to the one-step and two-step processes described in Example 2.
- Figure 4 shows that the protein-rich defatted egg yolk powder has a some iron- binding activity at neutral pH.
- the iron-binding activity of the defatted yolk extract is significantly reduced at acidic pH in acetate buffer, but can be improved by using a two-step acidification process, i.e. by pre-mixing the iron and egg extract in water at neutral pH and further acidifying with acetate buffer.
- the efficiency of defatted yolk powder to bind iron at acidic pH using the two-step method was surprisingly even higher than that obtained at neutral pH where maximum efficiency was expected.
- Example 5 Sensory properties of rapeseed oil mayonnaise during storage at room temperature
- the reference mayonnaise sample was prepared as follows: 1.36 kg egg yolk, 1 .58 kg water, 500 g mustard, 328 g vinegar spirit 18% were mixed in a Stephan mixer. The dry mixture containing salt, sugar and flavours was added to the liquid ingredient mixture and this new mixture was stirred. Finally 16 kg rapeseed oil was emulsified into the previous mixture. The mayonnaise sample containing 75 ppm EDTA was prepared with the same process, EDTA was added to the dry mixture. Mayonnaise samples were conditioned into glass jars. Steam injection to reduce oxygen pressure was carried out on the samples before sealing with an aluminium lid. Mayonnaise jars were stored at 20 °C in the dark during several months.
- the sensory attributes of the mayonnaise samples were assessed by a trained panel of 1 1 people.
- the samples were prepared in 20 ml transparent plastic cups (-15 g serving), and individually covered with food-grade plastic film.
- the samples were coded with random 3- digit numbers.
- the samples were distributed to the panellists in monadic order (one at the time) at 20 °C.
- the panellists described the rancid intensity in terms of aroma (odour in nose), flavour (taste in mouth) and persistency (after-taste after spitting out).
- the difference among samples was determined using analysis of variance ANOVA with a 5% limit of significance (alpha risk).
- the significant differences were further analyzed using the LSD multiple paired comparison test with a 5% limit of significance (alpha risk). The significant differences are shown with different letters in brackets in the following tables.
- Example 5 clearly shows that rapeseed oil mayonnaise containing omega-3 fatty acids does not keep over storage because of significant rancid off note development (odour, taste and after-taste up to 4 months of storage), as opposed to the rapeseed oil mayonnaise containing EDTA which does not get rancid over shelf life.
- Example 6 Effect of egg livetins on rancidity development in rapeseed oil mayonnaise Egg livetin fraction was prepared according to the method described in Example 1.
- Mayonnaise containing 2 wt% egg livetins was prepared as follows: 1 .36 kg egg yolk, 400 g livetin fraction and 1 .18 kg water were mixed in a Stephan mixer. 500 g mustard was added to the liquid ingredient mixture and this new mixture was stirred. 328 g vinegar spirit 18% containing salt, sugar and flavours was added and the mixture was stirred. Finally 16 kg rapeseed oil was emulsified into the previous mixture. The separate addition of mustard and vinegar allows step-wise acidification of the yolk/livetins mixture, thus formation of the iron- protein complexes.
- the mayonnaise sample containing 75 ppm EDTA was prepared according to the process described in example 5. Mayonnaise samples were conditioned and stored according to the method described in example 5.
- Example 6 shows that the use of livetins in rapeseed oil mayonnaise is as efficient at preventing rancidity development after 2 months of storage as EDTA, and livetins are an efficient natural solution to extend shelf life of omega-3 mayonnaise.
- Example 7 Effect of hydrolyzed egg protein on rancidity development in rapeseed oil mayonnaise
- Mayonnaise containing 1.2 wt% hydrolyzed egg white was prepared as follows: 1 .36 kg egg yolk, 240g hydrolyzed egg white and 1 .34 kg water were mixed in a Stephan mixer. 500 g mustard was added to the liquid ingredient mixture and this new mixture was stirred. 328 g vinegar spirit 18% containing salt, sugar and flavours was added and the mixture was stirred. Finally 16 kg rapeseed oil was emulsified into the previous mixture. The separate addition of mustard and vinegar allows step-wise acidification of the yolk/livetins mixture, thus the iron- protein complexes.
- the mayonnaise sample containing 75 ppm EDTA was prepared according to the process described in example 5. Mayonnaise samples were conditioned and stored according to the method described in example 5.
- Example 7 shows that the use of hydrolyzed egg white in rapeseed oil mayonnaise prevents rancidity development after 2 months of storage in the same way as EDTA. Hydrolyzed egg white is thus an efficient solution to extend shelf life of omega-3 mayonnaise without using synthetic additives.
- Example 8 Effect of two-step acidification process on rancidity development in rapeseed oil mayonnaise
- Mayonnaise containing 1.2 wt% hydrolyzed egg white was prepared in a two-step process according to the method described in example 7.
- Mayonnaise containing 1 .2 wt% hydrolyzed egg white in a one-step process was prepared according to the method described in example 5, where 240 g of hydrolyzed egg white powder was added to the dry mixture.
- Mayonnaise samples were conditioned and stored according to the method described in example 5. Sensory assessment of the different mayonnaise samples was performed according to the procedure described in example 5. The significant differences are shown with different letters in brackets in the following table.
- Example 8 shows that with the standard one-step process, the mayonnaise containing hydrolyzed egg white is not significantly different from the reference mayonnaise in term of rancid off note. However with the new two-step process, the mayonnaise containing hydrolyzed egg white is significantly less rancid than the reference mayonnaise. The use of a two-step process in rapeseed oil mayonnaise containing hydrolyzed egg white is thus more efficient at preventing rancidity development during storage than the one-step standard process.
Abstract
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EP12783591.6A EP2782459A1 (en) | 2011-11-21 | 2012-11-07 | Emulsified food product containing egg protein and iron |
PCT/EP2012/071983 WO2013075940A1 (en) | 2011-11-21 | 2012-11-07 | Emulsified food product containing egg protein and iron |
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RU (1) | RU2014125254A (en) |
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