WO2015041194A1 - 物性が改良された発酵乳の製造方法 - Google Patents
物性が改良された発酵乳の製造方法 Download PDFInfo
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- WO2015041194A1 WO2015041194A1 PCT/JP2014/074348 JP2014074348W WO2015041194A1 WO 2015041194 A1 WO2015041194 A1 WO 2015041194A1 JP 2014074348 W JP2014074348 W JP 2014074348W WO 2015041194 A1 WO2015041194 A1 WO 2015041194A1
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- fermented milk
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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
- A23C3/00—Preservation of milk or milk preparations
- A23C3/02—Preservation of milk or milk preparations by heating
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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
- A23C9/12—Fermented milk preparations; Treatment using microorganisms or enzymes
- A23C9/1203—Addition of, or treatment with, enzymes or microorganisms other than lactobacteriaceae
- A23C9/1213—Oxidation or reduction enzymes, e.g. peroxidase, catalase, dehydrogenase
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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
- A23C9/12—Fermented milk preparations; Treatment using microorganisms or enzymes
- A23C9/123—Fermented milk preparations; Treatment using microorganisms or enzymes using only microorganisms of the genus lactobacteriaceae; Yoghurt
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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
- A23C9/12—Fermented milk preparations; Treatment using microorganisms or enzymes
- A23C9/123—Fermented milk preparations; Treatment using microorganisms or enzymes using only microorganisms of the genus lactobacteriaceae; Yoghurt
- A23C9/1238—Fermented milk preparations; Treatment using microorganisms or enzymes using only microorganisms of the genus lactobacteriaceae; Yoghurt using specific L. bulgaricus or S. thermophilus microorganisms; using entrapped or encapsulated yoghurt bacteria; Physical or chemical treatment of L. bulgaricus or S. thermophilus cultures; Fermentation only with L. bulgaricus or only with S. thermophilus
Definitions
- the present invention has a smooth texture (texture), and changes in physical properties accompanying the aggregation of milk proteins that occur during refrigerated storage and distribution (generation of water separation, particle size of milk proteins (aggregated particles))
- the present invention relates to a method for producing fermented milk of good quality in which increase or occurrence of roughness associated therewith is suppressed.
- Patent Document 1 proposes a method of blending a specific amount of whey hydrolyzate in raw material milk and fermenting it to produce fermented milk, followed by a homogenization treatment.
- a fermented milk beverage (drink type yogurt) in which aggregation and precipitation of milk protein suspended particles are suppressed
- Patent Document 2 proposes a method of homogenizing the same as described above after producing a fermented milk by blending a specific amount of high-purity whey protein into raw milk and fermenting it.
- a soft type fermented milk having an appropriate viscosity and a smooth texture can be produced without using a thickener.
- Patent Documents 3 and 4 in the production of soft type fermented milk, by adopting a process of extruding a card of fermented milk from a mesh or nozzle having a predetermined pore size, fermentation with a smooth texture and texture It is described that milk can be produced.
- stationary type fermented milk hard type yogurt, set type yogurt
- glucose oxidase glucose oxidase
- Patent Documents 5 to 8 fermented milk raw material mix with lactic acid bacteria starter and peroxidase is fermented to prevent whey separation and protein aggregation during storage and distribution.
- lactic acid bacteria starter and peroxidase is fermented to prevent whey separation and protein aggregation during storage and distribution.
- a fermented dairy product having a fine and smooth texture can be produced.
- neither of these documents teaches the use of glucose oxidase.
- Glucose oxidase has been known to have antibacterial action for some time. This antibacterial action is due to glucose being oxidized by glucose oxidase to produce hydrogen peroxide.
- a method for producing fermented milk using the antibacterial action of glucose oxidase in Patent Document 9, in order to avoid antibody deactivation due to heating in the production of antibody-containing fermented food, glucose oxidase is added to raw milk with hydrogen peroxide. It is described that raw milk is sterilized by adding it as a generator and then fermented with lactic acid bacteria.
- glucose oxidase is disclosed as a hydrogen peroxide generator, that is, a bactericidal agent, together with glucose as its substrate.
- Patent Document 9 does not have a problem of suppressing changes in physical properties associated with milk protein aggregation, and does not suggest the use of glucose oxidase.
- glucose oxidase substrate glucose oxidase substrate (glucose) or a component serving as the substrate is blended in a ratio of a certain amount or more in raw material milk, so that physical properties associated with milk protein aggregation can be obtained. It is described that fermented milk of good quality can be produced in which changes (generation of water separation, increase in milk protein particle diameter, or generation of roughness associated therewith) are suppressed.
- the present invention is fermented milk in which changes in physical properties associated with milk protein aggregation occurring during refrigerated storage and distribution are suppressed, specifically, generation of water separation, increase in the particle diameter of milk protein (aggregated particles), Or it aims at providing the manufacturing method of fermented milk in which generation
- the inventors of the present invention have made extensive studies to solve the above-described problems.
- glucose is not added to the raw material milk without adding (compounding) a component that produces glucose.
- water separation and milk protein (aggregated particle) particle size increase over time accompanying milk protein aggregation are significantly suppressed compared to when glucose oxidase is not added.
- Fermented milk with the stability of these physical properties can be delivered or stored (store display) under refrigerated conditions until it reaches the consumer's hands immediately after production.
- the present invention has been completed by confirming that it possesses the appropriate physical properties and good flavor required for fermented milk without impairing the flavor.
- the present invention relates to the inventions of the following aspects.
- (I) Method for producing fermented milk with improved physical properties (1) A step of preparing a fermented milk mix using milk raw materials, (2) A method for producing fermented milk comprising a step of heat-sterilizing a fermented milk mix, and (3) adding (compounding) a starter to the heat-sterilized fermented milk mix and fermenting the mixture.
- steps (1) to (3) at least one of the following (A) to (C) is performed: (A) Fermented milk having a glucose concentration of 0.05% by weight or less, preferably 0.04% by weight or less, more preferably 0.03% by weight or less, and further preferably 0.02% by weight or less in the step (1).
- a process of adding glucose oxidase to the mix to prepare a fermented milk mix under the conditions of the glucose concentration (B) Before the step (3), the heat-sterilized glucose concentration is 0.05% by weight or less, preferably 0.04% by weight or less, more preferably 0.03% by weight or less, and further preferably 0.02% by weight.
- (I-4) Compared with fermented milk produced without using glucose oxidase and / or fermented milk produced with glucose oxidase at a glucose concentration of 1% by weight or more, preferably 3% by weight or more.
- the physical property change accompanying aggregation of milk protein is selected from the group consisting of generation of water separation (water separation), increase in particle diameter of milk protein (and / or fat), and generation of roughness of fermented milk tissue.
- the change in physical properties accompanying the aggregation of milk protein is at least one selected from the group consisting of water separation (moisture separation) and an increase in milk protein (and / or fat) particle size.
- the production method according to any one of (I-1) to (I-4).
- the heat sterilization temperature in the step (2) is 65 ° C. or higher, preferably 90 ° C. or higher, more preferably 90 to 100 ° C., described in any one of (I-1) to (I-7) Production method.
- the fermented milk is a post-fermentation type yogurt, and the operation (A) is performed in the step (1), or the operation (B) is performed before the step (3).
- (II) Method for improving physical properties of fermented milk (II-1) (1) A step of preparing a fermented milk mix using milk raw materials, (2) For fermented milk produced by a method having a step of heat-sterilizing the fermented milk mix and (3) adding (mixing) a starter to the heat-sterilized fermented milk mix and fermenting it, A method of suppressing the accompanying physical property change, In the above steps (1) to (3), at least one of the following (A) to (C) is performed: (A) Fermented milk having a glucose concentration of 0.05% by weight or less, preferably 0.04% by weight or less, more preferably 0.03% by weight or less, and further preferably 0.02% by weight or less in the step (1).
- step (3) A process of adding glucose oxidase to the mix to prepare a fermented milk mix under the conditions of the glucose concentration, (B) Before the step (3), the heat-sterilized glucose concentration is 0.05% by weight or less, preferably 0.04% by weight or less, more preferably 0.03% by weight or less, and further preferably 0.02% by weight. Treatment of adding glucose oxidase to less than% fermented milk mix, (C) After step (3), the glucose concentration prepared in step (3) is 0.05% by weight or less, preferably 0.04% by weight or less, more preferably 0.03% by weight or less, more preferably A process of adding glucose oxidase to 0.02% by weight or less of fermented milk.
- (II-4) Compared with fermented milk produced without using glucose oxidase and / or fermented milk produced with glucose oxidase at a glucose concentration of 1% by weight or more, preferably 3% by weight or more.
- the physical property change accompanying the aggregation of milk protein is selected from the group consisting of generation of water separation (water separation), increase in particle diameter of milk protein (and / or fat), and generation of roughness of fermented milk tissue.
- the physical property change accompanying the aggregation of milk protein is at least one selected from the group consisting of water separation (separation of water) and increase in the particle diameter of milk protein (and / or fat).
- the heat sterilization temperature in step (2) is 65 ° C. or higher, preferably 90 ° C. or higher, more preferably 90 to 100 ° C. (II-1) to (II-7) Method.
- (II-9) A method that does not include the operation of externally adding a substrate for glucose oxidase and a substance that can be a substrate for glucose oxidase as components other than milk ingredients through all steps (1) to (3) (II- 1) The method described in any one of (II-8).
- the fermented milk is a post-fermentation type yogurt, and the operation (A) is performed in the step (1), or the operation (B) is performed before the step (3).
- the method of the present invention compared to the case where glucose oxidase is not added, changes in physical properties accompanying aggregation of milk protein, which occurs during refrigerated storage and distribution, specifically, generation of water separation, milk protein (coagulated particles) ), Or the occurrence of tissue roughness associated therewith can be significantly suppressed.
- fermented milk produced by adding a substrate (glucose) or a substance that generates a substrate in addition to glucose oxidase to a milk raw material, particularly during refrigerated storage or distribution.
- Fermented milk can be produced in which water separation and milk protein (coagulated particles) generated are stably and significantly suppressed over time.
- the method of the present invention is a simple method that can be carried out while utilizing the current production process of fermented milk as it is, and does not impair the original flavor of fermented milk, and has appropriate physical properties and good flavor required for fermented milk. This is a method that can be stably maintained for a longer time.
- the method for producing fermented milk of the present invention comprises at least the following three steps (1) to (3): (1) a step of preparing a fermented milk mix using milk raw materials, (2) A method for producing fermented milk, comprising a step of heat-sterilizing a fermented milk mix, and (3) a step of adding a starter to the heat-sterilized fermented milk mix and fermenting the mixture.
- step (1) a process of adding glucose oxidase to a fermented milk mix having a glucose concentration of 0.05% by weight or less to prepare a fermented milk mix under the conditions of the glucose concentration
- step (2) a process of adding glucose oxidase to a fermented milk mix having a heat-sterilized glucose concentration of 0.05% by weight or less before the step (3)
- step C A process of adding glucose oxidase to fermented milk having a glucose concentration of 0.05% by weight or less prepared in the step (3) after the step (3).
- “fermented milk” means “fermented with lactic acid bacteria or yeast containing milk or a non-fat milk solid content equal to or higher than milk, as defined in the ordinance of milk, etc.
- Yogurt non-fat milk solid content of 8% or more and containing 10 million or more lactic acid bacteria or yeast per ml: Ministry of Health, Labor and Welfare ordinance of Japan
- milk Product lactic acid bacteria beverage non-fat milk solid content is less than 8% and contains 10 million or more lactic acid bacteria or yeast per ml: Japan Ministry of Health, Labor and Welfare Ordinance
- lactic acid bacteria beverage non-fat milk solid content is 3 %, which contains 10 million or more lactic acid bacteria or yeast per ml: Ministry of Health, Labor and Welfare of Japan), preferably yogurt.
- Yogurt is classified into two types, “pre-fermentation type” and “post-fermentation type”, depending on the preparation method.
- the former pre-fermentation type yogurt is fermented in a tank with a fermentation mix prepared by adding a fermented milk starter to raw milk, and then the generated card is crushed and, if necessary, with a gelling agent. Manufactured by filling food containers.
- the latter post-fermentation type yogurt is manufactured by adding a fermented milk starter to raw material milk to prepare a fermented mix, filling the fermented mix into a single-meal container, and fermenting in the container.
- soft yogurt and drink yogurt belong to the “pre-fermentation type”
- hard yogurt belongs to the “post-fermentation type”.
- the yogurt targeted by the present invention includes these two types of yogurt, “pre-fermentation type” and “post-fermentation type”.
- pre-fermentation type produced by fermenting in a single food container
- glucose oxidase or the like cannot be added to the fermented milk after the operation of (C), that is, the fermentation step of (3).
- the production method of the present invention performs the operation of (A) in the above step (1) or (3) before the step (B). Performed by operation.
- the operation (A) is performed in the step (1) or the step (3) (B) or (C) is performed after step (3), or at least one of the operations can be performed.
- the fermented milk targeted by the present invention is preferably a “pre-fermented type” yogurt characterized by a smoother texture, and the production method of the present invention comprises the “pre-fermented type” yogurt (soft yogurt And drink yogurt).
- dairy ingredients means dairy products used as raw materials for fermented milk, such as raw milk (unsterilized milk), sterilized milk (sterilized) Milk), nonfat milk, full fat concentrated milk, nonfat concentrated milk, full fat milk powder, skim milk powder, butter (unsalted butter), buttermilk, cream, whey protein concentrate (WPC), whey protein isolate (WPI) , ⁇ -lactalbumin ( ⁇ -La), ⁇ -lactoglobulin ( ⁇ -Lg), etc., can be selected as appropriate according to the type of fermented milk actually produced. These can be used in combination of two or more.
- Non-fat milk and / or non-fat dry milk can be combined with (sterilized milk).
- the glucose concentration contained in the fermented milk mix depends on the glucose concentration of each milk raw material, it may be a total value thereof, and is not particularly limited as long as it is.
- glucose is 0 to 0.05% by weight, preferably 0.003 to 0.04% by weight, more preferably 0.005 to 0.03% by weight, More preferably, the milk raw materials described above can be used in appropriate combination within the range of 0.007 to 0.02% by weight.
- “Fermented milk mix” is a raw material preparation in which fermented milk ingredients are mixed. If necessary, sugars such as water and sugar (provided that the substrate of glucose oxidase [glucose] And a sweetening agent such as a sweetener and a flavoring agent are added (blended), and if necessary, dissolved and heated. If necessary, stabilizers (gelling agents) such as gelatin, agar, carrageenan, guar gum, low methoxy pectin and high methoxy pectin can be added.
- sugars such as water and sugar (provided that the substrate of glucose oxidase [glucose] And a sweetening agent such as a sweetener and a flavoring agent are added (blended), and if necessary, dissolved and heated.
- stabilizers such as gelatin, agar, carrageenan, guar gum, low methoxy pectin and high methoxy pectin can be added.
- the present invention is characterized in that a glucose oxidase substrate and a substance that can be a glucose oxidase substrate are preferably not used as raw materials other than milk raw materials. That is, in the present invention, the glucose oxidase substrate and / or the substance that can be the glucose oxidase substrate contained in the fermented milk mix are preferably all derived from milk raw materials.
- the substrate of glucose oxidase is glucose.
- the “substance that can be a substrate for glucose oxidase” means a substance that produces a substrate for glucose oxidase (glucose).
- the ratio of each raw material to be added to the fermented milk mix is determined according to the type of fermented milk (non-fat milk solid content) (yogurt: 8% or more, dairy lactic acid bacteria beverage: less than 8%, lactic acid bacteria beverage: 3 %), And as long as it is satisfied, there is no particular limitation.
- the fat content is 0 to 8% by weight, preferably 0.1 to 6% by weight, more preferably 0.5 to 4% by weight in 100% by weight of the fermented milk mix.
- the milk raw materials described above can be used in appropriate combinations within the range where the non-fat milk solid content is 5 to 25% by weight, preferably 6 to 20% by weight, more preferably 7 to 15% by weight.
- said "fermented milk mix in 100 weight%" can be paraphrased with "fermented milk in 100 weight%.” .
- the milk raw materials can be appropriately combined so that the fat content and the non-fat milk solid content are within the above ranges.
- raw milk (and / or pasteurized milk) and skim milk powder are used as the milk raw material
- raw milk (And / or pasteurized milk, etc.) as a blending ratio of 0 to 100% by weight, preferably 10 to 90% by weight, more preferably 20 to 80% by weight, still more preferably 40 to 80% by weight
- Examples include 0 to 25% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, and still more preferably 2 to 10% by weight.
- the production method for carrying out the treatment (A) in the step (1) which is an embodiment of the present invention, is characterized in that glucose oxidase is used as one of the raw materials when preparing the above fermented milk mix.
- the production method for carrying out the treatment (A) in the step (1) is a preferred embodiment of the present invention because the reaction time of glucose oxidase is easy to adjust.
- fermented milk mix is prepared by heating, adding glucose oxidase to this may inactivate the enzyme.
- the fermented milk mix prepared by heat sterilization is cooled to a temperature at which the enzyme is not previously deactivated, preferably to room temperature (25 ⁇ 5 ° C.) or less, more preferably to 15 ° C. or less. It is preferable to keep it.
- a commercially available glucose oxidase preparation can be used for glucose oxidase.
- Examples of commercially available glucose oxidase preparations include, for example, Shin Nippon Chemical Industry Co., Ltd., DKSH Japan Co., Ltd., Shonan Wako Pure Chemical Industries, Ltd., Nagase Seikagaku Corporation, Kyowa Enzyme Co., Ltd. ) (All of which are from Japan) and the like. However, it is not limited to these.
- the blending ratio of glucose oxidase (about 2000 to 4000 units / kg) per 100% by weight of the fermented milk mix is 0.1 to 1% by weight, preferably 0.1 to 0.5% by weight, more preferably 0.15 to 0.3% by weight, more preferably 0.15 to 0.2% by weight.
- the fermented milk mix to which glucose oxidase has been added (blended) has a temperature of 5 to 43 ° C., preferably 5 to 35 ° C., more preferably 5 to 30 ° C., and even more preferably 5 to 25 ° C. Placed.
- the standing time is not particularly limited, but is usually 1.5 hours or more, preferably 1.5 to 24 hours, more preferably 2 to 16 hours, further preferably 2 to 6 hours, and particularly preferably 2 to 4 hours. It's time.
- the step of heat sterilizing the fermented milk mix (1)
- the fermented milk mix prepared in the step (1) In this fermented milk mix, the one prepared through the operation (A) and the operation (A) (Both prepared without passing) are then subjected to a sterilization treatment by heating.
- the heating temperature and heating time are not particularly limited as long as the target sterilization is possible. For this reason, unlike the method described in Patent Document 9, a heating temperature of 65 ° C. or higher is employed. Preferably, it is sufficient that the temperature of the fermented milk mix itself is 90 ° C or higher, preferably 90 to 100 ° C, more preferably about 95 ° C. A method of treating for ⁇ 5 minutes and a method of treating at 90 to 95 ° C. for 1 to 3 minutes can be mentioned without limitation.
- the production method (B) is performed before (3) step, and glucose oxidase is added (blended) to the fermented milk mix heat-sterilized by the above method in (2) step. It is characterized by that.
- the fermented milk mix targeted here is preferably prepared without going through the operation (A) in the step (1).
- glucose oxidase is added (mixed).
- the enzyme may be deactivated.
- the fermented milk mix is previously kept at a temperature at which the enzyme is not inactivated at 5 to 43 ° C., preferably 5 to 35 ° C., more preferably 5 to 30 ° C., more preferably 5 to 5 ° C. It is preferable to cool to 25 ° C.
- the amount of glucose oxidase used and its source are as described above.
- “Starter” means an inoculum such as lactic acid bacteria or yeast inoculated to ferment a fermented milk mix.
- a known starter can be appropriately used as the “starter”, but a lactic acid bacteria starter is preferable.
- Lactobacillus starters include L. bulgaricus (L. bulgaricus), Streptococcus thermophilus (S. thermophilus), Streptococcus makedonisu, L. lactis, Lactobacillus gasseri (L. gasseri)
- one or more lactic acid bacteria generally used for producing fermented milk can be used.
- a lactic acid bacteria starter based on a mixed starter of Lactobacillus bulgaricus (L.bulgaricus) and Streptococcus thermophilus (S. it can. Based on this lactic acid bacteria starter, after considering the fermentation temperature and fermentation conditions of the desired fermented milk, add other lactic acid bacteria such as Lactobacillus gasseri and Bifidobacterium Also good.
- the addition amount of the starter can be appropriately set according to the addition amount employed in the known method for producing fermented milk.
- the starter inoculation method is not particularly limited, and a method commonly used in the production of fermented milk can be appropriately used.
- the conditions for the fermentation treatment can be appropriately set in consideration of the type of fermented milk, the desired flavor, the type of starter to be used, and the like.
- the temperature in the fermentation chamber (fermentation temperature) is maintained in the range of 30 to 50 ° C., and the fermentation is performed while standing in the fermentation chamber. If it is such temperature conditions, since lactic acid bacteria generally tend to be active, fermentation can proceed effectively.
- the fermentation temperature is usually about 30 to 50 ° C., preferably 35 to 45 ° C., more preferably 37 to 43 ° C.
- Fermentation time can be appropriately set and adjusted with reference to the fact that the lactic acidity of the fermented milk mix reaches a predetermined ratio.
- the lactic acid acidity is, for example, about 0.7 to 1.5% in the case of “pre-fermentation type” yogurt, and about 0.7 to 0.8% in the case of “post-fermentation type” yogurt.
- the fermentation time is usually about 1 hour to 12 hours, preferably about 2 hours to 5 hours, more preferably about 3 hours to 4 hours.
- pre-fermentation type yogurt when the lactic acid acidity reaches about 1.5 to 2%, and in the case of “post-fermentation type” yogurt, when the lactic acid acidity reaches about 0.7 to 0.8%,
- the fermentation is stopped by cooling to 15 ° C. or less, preferably 0 to 10 ° C., more preferably 3 to 7 ° C.
- the operation (C) can be performed after the step (3). That is, glucose oxidase can be added (blended) to the fermented milk prepared by the steps (1) to (3).
- the fermented milk to which glucose oxidase is added (blended) has a temperature of 5 to 43 ° C., preferably 5 to 35 ° C., more preferably 5 to 30 ° C., and still more preferably 5 to 25 ° C. Placed.
- the standing time is not particularly limited, but is usually 1.5 hours or more, preferably 1.5 to 24 hours, more preferably 2 to 16 hours, further preferably 2 to 6 hours, and particularly preferably 2 to 4 hours. It's time.
- the production method containing the operation (C) is an embodiment of the production method of the present invention.
- the fermented milk targeted here is preferably a “pre-fermented type” yogurt as described above, and (1) the process is not subjected to (A), and (3) before the process. (B) It was prepared without operation.
- the amount of glucose oxidase used and its source are as described above.
- the fermented milk targeted by the present invention can be produced.
- the culture step (3) is performed using a tank (tank culture).
- the said (C) operation is also performed with respect to fermented milk prepared in the tank.
- tank culture fermented and coagulated curd is agitated and crushed and, if necessary, sterilized, cooled, emulsified, and aged, then filled into a single-meal container and prepared as a fermented milk product. .
- the hardness of the curd obtained after fermentation in the tank is 35 to 55 g, preferably It is relatively soft as 35-50 g, more preferably 35-45 g. Therefore, the card is not crushed by a conventional homogenization method, but can be easily crushed by passing it through a filter (membrane) having a pore size of about 60 mesh, and a smooth textured yogurt can be prepared.
- a filter membrane having a pore size of about 60 mesh
- the fermented milk is a “post-fermentation type” yoghurt
- the fermented milk mix is filled in the individual food container before the culture process of (3), and the culture process of (3) is performed in the container. Performed (in-container culture).
- the operation (C) is not performed in the culture step (3). After culturing in the container, it is cooled (refrigerated) and prepared as a product of fermented milk.
- the method for improving physical properties of fermented milk of the present invention includes at least the following three steps (1) to (3): (1) a step of preparing a fermented milk mix using milk raw materials, Changes in physical properties associated with milk protein aggregation in fermented milk products produced by a method comprising (2) heat-sterilizing the fermented milk mix and (3) adding a starter to the heat-sterilized fermented milk mix and fermenting A method of suppressing
- steps (1) to (3) at least one of the following (A) to (C) is performed:
- C The process which adds glucose
- the fermented milk produced or processed in this way is produced without using any of the operations (A) to (C), that is, without using glucose oxidase, as shown in Examples described later.
- control fermented milk Compared to fermented milk produced and / or fermented milk produced using glucose oxidase at a glucose concentration of 1% by weight or more (hereinafter collectively referred to as “control fermented milk”).
- Changes in physical properties associated with are significantly suppressed.
- the physical property change accompanying the aggregation of the milk protein can include at least one selected from the generation of water separation, the increase in the particle diameter of the milk protein (aggregated particles), and the generation of roughness of the tissue of the fermented milk.
- the texture of the fermented milk tissue is not particularly restricted, but is considered to be a phenomenon caused by an increase in the milk protein particle size.
- the water separation rate is preferably 19% or less. More preferably, the water separation rate is 15% or less, particularly preferably 10% or less.
- a water separation rate can be calculated
- the increase rate of the average particle diameter of milk protein (aggregated particles) during the storage period of 16 days from the production is preferably 30% or less. More preferably, it is 25% or less.
- the increase rate of the average particle size is the ratio of the average particle size (L0) immediately after production to the difference (Lt-L0) between the average particle size (Lt) after storage for 16 days and the average particle size (Lo) immediately after production ( ⁇ [Lt ⁇ L0] / L0 ⁇ ⁇ 100).
- the average particle size of the milk protein (aggregated particles) after 16 days of storage is preferably 13 ⁇ m or less.
- the fluctuation rate of the hardness and the viscosity in the storage period of 16 days from the production is 20% or less and 30% or less, respectively.
- these numerical ranges become a standard of the suitable aspect of this invention, this invention is not restrained.
- the fermented milk of the present invention has a change over time (physical properties) compared to the fermented milk of the control. (Change) is significantly suppressed.
- the method of the present invention is useful for maintaining the quality (appearance and texture) of fermented milk in a good state for as long as possible, at least during the expiration date.
- the period for maintaining the quality of fermented milk in a good state is about 7 days from the first day of production, preferably about 10 days, more preferably about 12 days, and more preferably about 14 days. be able to.
- Experimental Example 1 Effect of improving physical properties of fermented milk having a general composition
- fermented milk 1-3 According to the formulation described in Table 1, three types of fermented milk 1-3 were prepared.
- “fermented milk 1” is fermented milk (Comparative Example 1) having a conventionally known formulation (conventional formulation) (glucose concentration: about 0.015 wt%).
- “Fermented milk 2” is fermented milk (Example 1) prepared by adding glucose oxidase to the conventional formulation of “fermented milk 1” (glucose concentration: about 0.015% by weight).
- “Fermented milk 3” is fermented milk (Comparative Example 2) prepared by adding lactase to the formulation of “fermented milk 2”.
- lactose lactose concentration: about 6% by weight
- glucose is generated in the raw material.
- glucose concentration of fermented milk 3 (Comparative Example 2) is a theoretical value of 3.07% by weight assuming that lactose is completely decomposed by lactase.
- the milk ingredients shown in Table 1 raw milk, skim milk powder, unsalted butter, WPC34 (whey protein concentrate)) (fat content: 3.1 wt%, no Fat milk solid content: 10.8% by weight) and raw water were placed in a small tank and dissolved by stirring and mixing while heating at about 60 ° C. to prepare each raw milk (fermented milk mix). Then, after cooling each raw material milk to about 5 ° C., glucose oxidase was added for fermented milk 2 and lactase and glucose oxidase were added for fermented milk 3 according to the formulation shown in Table 1 ((1) Process).
- each raw material milk (fermented milk mix) prepared above was allowed to stand at about 5 ° C. for about 14 hours, and then heat sterilized with stirring until it reached about 95 ° C. (step (2)).
- Each sterilized milk thus prepared was cooled to about 43 ° C. and then inoculated (added) with a lactic acid bacteria starter at a rate of 2% by weight (step (3)).
- each sterilized milk to which lactic acid bacteria starter was added was filled into a small container, left in a fermentation chamber at about 43 ° C., and transferred to a refrigerator at about 5 ° C. when the lactic acid acidity reached 0.72%. Fermentation was stopped by standing in the refrigerator, and each fermented milk 1 to 3 was prepared.
- Table 2 shows the measurement results of physical properties of fermented milk 1 to 3 (3 types).
- “Fermented milk 2 (Example 1)” has a smaller variation rate of water separation than “Fermented milk 1 (Comparative example 1)” and “Fermented milk 3 (Comparative example 2)”, and it has continued for 16 days from the first day of production. Thus, it was confirmed that the occurrence of water separation was stably suppressed. In other words, compared to “fermented milk 1” and “fermented milk 3”, in “fermented milk 2”, water separation is stably suppressed over time during refrigerated storage and distribution, and the physical properties are good. It is thought that it will be maintained.
- “Fermented milk 2 (Example 1)” has a smaller change in average particle size compared to “Fermented milk 1 (Comparative example 1)” and “Fermented milk 3 (Comparative example 2)”, and 16 days from the first day of production. In particular, it was confirmed that the average particle size was stably maintained over the period from the first day of production to 8 days. In other words, compared to “fermented milk 1” and “fermented milk 3”, in “fermented milk 2”, the average particle size is less likely to change over time during refrigerated storage and distribution, and good physical properties are maintained. It is thought.
- the milk raw materials (fat dry milk, cream, WPC34 (whey protein concentrate), MPC (milk protein concentrate)) shown in Table 4 (fat content: 8.0% by weight, nonfat milk solid content: 14.6% by weight) and raw material water were added to a small tank and dissolved by stirring and mixing while keeping the temperature at about 60 ° C. to prepare each raw milk (fermented milk mix). Then, after each raw material milk was cooled to about 5 ° C., glucose oxidase was added to fermented milk 5 according to the formulation shown in Table 4 (step (1)).
- each raw material milk prepared above was allowed to stand at about 5 ° C. for about 16 hours, and then heat sterilized with stirring until it reached about 95 ° C. (step (2)).
- Each sterilized milk thus prepared was cooled to about 43 ° C. and then inoculated (added) with a lactic acid bacteria starter at a ratio of 2% by weight (step (3)).
- each sterilized milk to which a lactic acid bacteria starter was added was filled into a small tank, left at about 43 ° C., and filtered (backed) using a filter (60 mesh) when the pH reached 4.6. Next, it was filled into a small container, cooled to 10 ° C. or lower with ice water to stop fermentation, and each fermented milk 4 and 5 was prepared.
- fermented milk 5 As shown in Table 5, compared to “fermented milk 4 (Comparative Example 3)”, “fermented milk 5 (Example 2)” had almost the same acidity, pH and viscosity. The average particle size was much smaller. From this, even fermented milk with a high fat content and fermented milk with a high solid content concentration can be produced by adding glucose oxidase in the same manner as “fermented milk 2 (Example 1)” in Experimental Example 1. It can be seen that fermented milk having a small average particle size and small change with time and good physical properties can be obtained.
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Abstract
Description
(I-1)(1)乳原料を用いて発酵乳ミックスを調製する工程、
(2)発酵乳ミックスを加熱殺菌する工程、及び
(3)加熱殺菌した発酵乳ミックスにスターターを添加(配合)して発酵させる工程を有する発酵乳の製造方法であって、
上記(1)~(3)の工程において、下記の(A)~(C)のいずれか少なくとも1の処理が行われることを特徴とする発酵乳の製造方法:
(A)(1)工程において、グルコース濃度が0.05重量%以下、好ましくは0.04重量%以下、より好ましくは0.03重量%以下、さらに好ましくは0.02重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加して、当該グルコース濃度の条件下で発酵乳ミックスを調製する処理、
(B)(3)工程の前に、加熱殺菌したグルコース濃度が0.05重量%以下、好ましくは0.04重量%以下、より好ましくは0.03重量%以下、さらに好ましくは0.02重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加する処理、
(C)(3)工程の後に、(3)工程で調製されたグルコース濃度が0.05重量%以下、好ましくは0.04重量%以下、より好ましくは0.03重量%以下、さらに好ましくは0.02重量%以下の発酵乳にグルコースオキシダーゼを添加する処理。
(II-1)(1)乳原料を用いて発酵乳ミックスを調製する工程、
(2)発酵乳ミックスを加熱殺菌する工程、及び
(3)加熱殺菌した発酵乳ミックスにスターターを添加(配合)して発酵させる工程を有する方法で製造される発酵乳について、乳タンパク質の凝集に伴う物性変化を抑制する方法であって、
上記(1)~(3)の工程において、下記の(A)~(C)のいずれか少なくとも1の処理を行うことを特徴とする上記方法:
(A)(1)工程において、グルコース濃度が0.05重量%以下、好ましくは0.04重量%以下、より好ましくは0.03重量%以下、さらに好ましくは0.02重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加して、当該グルコース濃度の条件下で発酵乳ミックスを調製する処理、
(B)(3)工程の前に、加熱殺菌したグルコース濃度が0.05重量%以下、好ましくは0.04重量%以下、より好ましくは0.03重量%以下、さらに好ましくは0.02重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加する処理、
(C)(3)工程の後に、(3)工程で調製されたグルコース濃度が0.05重量%以下、好ましくは0.04重量%以下、より好ましくは0.03重量%以下、さらに好ましくは0.02重量%以下の発酵乳にグルコースオキシダーゼを添加する処理。
本発明の発酵乳の製造方法は、少なくとも下記の(1)~(3)の3工程:
(1)乳原料を用いて発酵乳ミックスを調製する工程、
(2)発酵乳ミックスを加熱殺菌する工程、及び
(3)加熱殺菌した発酵乳ミックスにスターターを添加して発酵させる工程
を有する発酵乳の製造方法であって、
上記(1)~(3)の工程において、下記の(A)~(C):
(A)(1)工程において、グルコース濃度が0.05重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加して、当該グルコース濃度の条件下で発酵乳ミックスを調製する処理、
(B)(3)工程の前に、加熱殺菌したグルコース濃度が0.05重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加する処理、
(C)(3)工程の後に、(3)工程で調製されたグルコース濃度が0.05重量%以下の発酵乳にグルコースオキシダーゼを添加する処理、
のいずれか少なくとも1つの処理が行われることを特徴とする製造方法である。
(1)乳原料を用いて発酵乳ミックスを調製する工程
「乳原料」は、発酵乳の原料として使用される乳製品を意味し、例えば、生乳(未殺菌乳)、殺菌処理した乳(殺菌乳)、脱脂乳、全脂濃縮乳、脱脂濃縮乳、全脂粉乳、脱脂粉乳、バター(無塩バター)、バターミルク、クリーム、ホエー蛋白質濃縮物(WPC)、ホエー蛋白質単離物(WPI)、α-ラクトアルブミン(α-La)、及びβ-ラクトグロブリン(β-Lg)などから、実際に製造する発酵乳の種類に応じて、適宜選択することができる。これらは2種以上を組み合わせて用いることができ、例えば、ヨーグルトの場合、エネルギーを低く抑えた状態で、無脂乳固形分を8%以上にするために、生乳及び/又は殺菌処理した乳(殺菌乳)に脱脂乳及び/又は脱脂粉乳を組み合わせることもできる。このとき、乳原料として、風味の良好さなどの観点から、生乳(未殺菌乳)及びその加工物を用いることが好ましい。
(1)の工程で調製された発酵乳ミックス(なお、この発酵乳ミックスには、(A)操作を経て調製されたもの、及び(A)操作を経ないで調製されたものの両方が含まれる)は、次いで加熱による殺菌処理に供される。
(2)の工程で加熱殺菌された発酵乳ミックス(なお、このミックスには(A)操作を経て調製されたもの、(B)操作を経て調製されたもの、(A)と(B)のいずれの操作も経ないで調製されたものが含まれる)は、次いで発酵処理に供される。
本発明の発酵乳の物性改良方法は、少なくとも下記の(1)~(3)の3工程:
(1)乳原料を用いて発酵乳ミックスを調製する工程、
(2)発酵乳ミックスを加熱殺菌する工程、及び
(3)加熱殺菌した発酵乳ミックスにスターターを添加して発酵させる工程
を有する方法で製造される発酵乳製品について、乳タンパク質凝集に伴う物性変化を抑制する方法であって、
上記(1)~(3)の工程において、下記の(A)~(C)のいずれか少なくとも1つの処理を行うことを特徴とする方法である:
(A)(1)工程において、グルコース濃度が0.05重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加して、当該グルコース濃度の条件下で発酵乳ミックスを調製する処理、
(B)(3)工程の前に、加熱殺菌したグルコース濃度が0.05重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加する処理、
(C)(3)工程の後に、(3)工程で調製されたグルコース濃度が0.05重量%以下の発酵乳にグルコースオキシダーゼを添加する処理。
(1)発酵乳1~3の調製
表1に記載する処方に従って、3種類の発酵乳1~3を調製した。
表1において、「発酵乳1」は、従来公知の処方(従来処方)からなる発酵乳(比較例1)である(グルコース濃度:約0.015重量%)。「発酵乳2」は、上記の「発酵乳1」の従来処方に対して、さらに、グルコースオキシダーゼを添加して調製した発酵乳(実施例1)である(グルコース濃度:約0.015重量%)。「発酵乳3」は、上記の「発酵乳2」の処方に対して、さらに、ラクターゼを添加して調製した発酵乳(比較例2)である。ラクターゼの添加により生乳や脱脂粉乳に含まれるラクトース(ラクトース濃度:約6重量%)が加水分解され、原料中にグルコースが生成している。なお、発酵乳3(比較例2)のグルコース濃度は、ラクターゼによって乳糖が全量分解されたと仮定すると理論値3.07重量%となる。
斯くして調製した発酵乳1~3を、約5℃の条件に16日間で静置した後に、離水率[%]、発酵乳に混在する凝固粒子の平均粒子径[μm]、乳酸酸度[%]、pH(20℃)、硬度(カードテンション、CT)[g]、粘度[Pa・s]を経時的(製造初日(1日目)、製造後の8日目と16日目)に測定した。
発酵乳(10℃)40 gを遠心沈降管(内径:20 mm)に充填し、遠心分離機に供した(遠心力:約180 G(回転半径:160 mm、回転数:1000 rpm、処理時間:10分間)。次いで、上清の重量を測定し、発酵乳の全部の重量(40 g)に対する上清の重量の割合を、離水率[%]として計算した。
レーザー回折式粒度分布計SALD - 2000(島津製作所)を用いて、発酵乳に混在する凝固粒子の平均粒子径[μm]を測定した。
フェノールフタレインを指示薬として、発酵乳に添加してから、水酸化ナトリウム(0.1規定)を滴定剤として、発酵乳に添加して測定した。具体的には、前記の発酵乳が薄桃色に変色したときの水酸化ナトリウムの添加量から、発酵乳に含まれる乳酸量(濃度)を換算して、その数値を指標とする。
ネオカードメーターM302(アイテクノエンジニアリング:旧・飯尾電機)を用いて、発酵乳の硬度[g]を測定した。この硬度計では、例えば、発酵乳(10 ℃)の100gを小型容器に充填し、ヨーグルトナイフ(小型の円盤状、直径:約20 mm)を侵入させて、発酵乳の硬度や滑らかさを評価できる。具体的には、100gの錘をつけたヨーグルトナイフで発酵乳の侵入角度を測定し、この測定値を曲線で表現する。この際、ナイフの高さを縦軸をとし、100gに更に加えた加重を横軸とする。そして、縦軸の10mmと横軸の10gとを同じ距離とする。その侵入角度曲線の破断に至るまでの距離を硬度(硬さ、弾力性)(g)の指標とする。
回転式B型粘度計TV-10M(東機産業)を用いて、発酵乳の粘度[Pa・s]を測定した。具体的には、発酵乳(10 ℃)100 gを小型容器に充填し、この発酵乳に上記の粘度計のローター No.4(コードM23)を侵入させて回転(30 rpm、30秒間)させることで粘度を評価する。
「発酵乳2(実施例1)」は、「発酵乳1(比較例1)」及び「発酵乳3(比較例2)」と比べて、離水の変動率が小さく、製造初日から16日間にわたり、安定して離水の発生が有意に抑えられていることが確認された。つまり、「発酵乳1」や「発酵乳3」に比べて、「発酵乳2」では、冷蔵保存時や流通時において、離水は経時的に安定して抑えられており、物性の良好さが維持されると考えられる。
「発酵乳2(実施例1)」は、「発酵乳1(比較例1)」及び「発酵乳3(比較例2)」と比べて、平均粒子経の変化が小さく、製造初日から16日間、特に製造初日から8日の期間にわたり、平均粒子経が安定して維持されていることが確認された。つまり、「発酵乳1」や「発酵乳3」に比べて、「発酵乳2」では、冷蔵保存時や流通時において、平均粒子経が経時的に変化しにくく、物性の良好さが維持されると考えられる。
「発酵乳1(比較例1)」の硬度は、製造初日から経時的に幾らか増加し、「発酵乳2(実施例1」と「発酵乳3(比較例2)」の硬度は、製造初日から経時的に幾らか低下する傾向が認められた。しかし、いずれの発酵乳の硬度も、全体として経時的な変化は大きくない。なかでも実施例1はもっとも経時的変化が小さかった。
「発酵乳1(比較例1)」、「発酵乳2(実施例1)」及び「発酵乳3(比較例2)」のいずれの発酵乳の粘度も、製造初日から経時的に低下する傾向が認められた。しかし、その低下の程度は、「発酵乳1(比較例1)」が最も大きく、次いで「発酵乳3(比較例2)」と大きく、「発酵乳2(実施例1)」の粘度の経時的な低下は、「発酵乳1」と「発酵乳3」よりも有意に抑えられていることが確認された。このことから、「発酵乳1」及び「発酵乳3」と比べて、「発酵乳2」では、冷蔵保存時や流通時において、粘度が経時的に変化しにくく、物性の良好さが維持されると考えられる。
「発酵乳1(比較例1)」、「発酵乳2(実施例1)」及び「発酵乳3(比較例2)」のいずれの乳酸酸度及びpHは、ほぼ同じであった。つまり、いずれの発酵乳も、冷蔵保存時や流通時において、風味(酸味)が経時的に変化しにくく、風味の良好さが維持されていると考えられる。
上記(1)で調製した発酵乳1~3について、専門パネルの5名で官能検査(風味評価)を実施した。検査結果(評価結果)を表3に示す。
(1)発酵乳4~5の調製
表4に記載する処方に従って、2種類の発酵乳4~5を調製した。
表4において、「発酵乳4」は、従来公知の処方(従来処方)からなる高脂肪の発酵乳(比較例3)である(グルコース濃度:約0.01重量%)。「発酵乳5」は、上記の「発酵乳4」の従来処方に対して、さらに、グルコースオキシダーゼを添加して調製した発酵乳(実施例2)である(グルコース濃度:約0.01重量%)。
さらに、これらの発酵乳4~5を 約5℃に2日間で静置した後に、実験例1に記載する方法に従って、平均粒子径[μm]、乳酸酸度[%]、pH(20℃)、及び粘度[Pa・s]を測定した。
発酵乳4~5について、専門パネル5名で官能検査(風味評価)を実施した。それらの検査結果(評価結果)を表6に示す。
Claims (14)
- (1)乳原料を用いて発酵乳ミックスを調製する工程、
(2)発酵乳ミックスを加熱殺菌する工程、及び
(3)加熱殺菌した発酵乳ミックスにスターターを添加して発酵させる工程
を有する発酵乳の製造方法であって、
上記(1)~(3)の工程において、下記の(A)~(C)のいずれか少なくとも1の処理が行われることを特徴とする発酵乳の製造方法:
(A)(1)工程において、グルコース濃度が0.05重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加して、当該グルコース濃度の条件下で発酵乳ミックスを調製する処理、
(B)(3)工程の前に、加熱殺菌したグルコース濃度が0.05重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加する処理、
(C)(3)工程の後に、(3)工程で調製されたグルコース濃度が0.05重量%以下の発酵乳にグルコースオキシダーゼを添加する処理。 - (1)の工程において(A)の処理が行われ、(2)の工程における加熱殺菌温度が65℃以上であることを特徴とする請求項1記載の製造方法。
- スターターとして、ブルガリア菌(Lactobacillus blugaricus)とサーモフィラス菌(Streptococcus thermophilus)を併用することを特徴とする請求項1または2に記載の製造方法。
- グルコースオキシダーゼを用いないで製造される発酵乳、及び/又はグルコースオキシダーゼを用いてグルコース濃度が1重量%以上の条件で製造される発酵乳と比べて、乳タンパク質の凝集に伴う物性変化が抑制された発酵乳の製造方法である、請求項1乃至3のいずれかに記載する製造方法。
- 乳タンパク質の凝集に伴う物性変化が離水発生、乳タンパク質及び/又は脂肪の粒子径の増大、及び発酵乳の組織のザラツキ発生からなる群から選択される少なくとも1つである、請求項4に記載する製造方法。
- 乳原料として未殺菌乳を用いることを特徴とする請求項1乃至5のいずれかに記載する製造方法。
- 発酵乳がヨーグルトである請求項1乃至6のいずれかに記載する製造方法。
- (1)乳原料を用いて発酵乳ミックスを調製する工程、
(2)発酵乳ミックスを加熱殺菌する工程、及び
(3)加熱殺菌した発酵乳ミックスにスターターを添加して発酵させる工程
を有する方法で製造される発酵乳について、乳タンパク質の凝集に伴う物性変化を抑制する方法であって、
上記(1)~(3)の工程において、下記の(A)~(C)のいずれか少なくとも1の処理を行うことを特徴とする上記方法:
(A)(1)工程において、グルコース濃度が0.05重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加して、当該グルコース濃度の条件下で発酵乳ミックスを調製する処理、
(B)(3)工程の前に、加熱殺菌したグルコース濃度が0.05重量%以下の発酵乳ミックスにグルコースオキシダーゼを添加する処理、
(C)(3)工程の後に、(3)工程で調製されたグルコース濃度が0.05重量%以下の発酵乳にグルコースオキシダーゼを添加する処理。 - (1)の工程において(A)の処理が行われ、(2)の工程における加熱殺菌温度が65℃以上であることを特徴とする請求項8記載の方法。
- スターターとして、ブルガリア菌(Lactobacillus blugaricus)とサーモフィラス菌(Streptococcus thermophilus)を併用することを特徴とする、請求項8または9に記載する方法。
- グルコースオキシダーゼを用いないで製造される発酵乳、及び/又はグルコースオキシダーゼを用いてグルコース濃度が1重量%以上の条件で製造される発酵乳と比べて、乳タンパク質の凝集に伴う物性変化を抑制する方法である、請求項8乃至10のいずれかに記載する方法。
- 乳タンパク質の凝集に伴う物性変化が、離水発生、乳タンパク質及び/又は脂肪の粒子径の増大、及び発酵乳の組織のザラツキ発生からなる群から選択される少なくとも1つである、請求項8乃至11のいずれかに記載する方法。
- 乳原料として未殺菌乳を用いることを特徴とする請求項8乃至12のいずれかに記載する方法。
- 発酵乳がヨーグルトである、請求項8乃至13のいずれかに記載する方法。
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