JP2000041576A - Production of powdered milk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a powdered milk having a high nutritive value and bioactive properties, good in quality, flavor, preservability, dispersibility and classification, and useful for foods, medicines or the like by mixing components while separately spray-drying plural solutions containing the different components from different spray nozzles. SOLUTION: Plural solutions containing different components, consisting of the solution containing an oil and fat containing a polyfunctional unsaturated fatty acid, such as a soybean oil containing α-linoleic acid, and the solution containing metal such as copper sulfate are mixed while spray-drying the solutions from respectively different spray-drying nozzles while regulating the angle and distance so that the spraying umbrellas may overlap to each other, to provide the objective powder milk. The overlap of the spraying umbrellas is preferably 1-90%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing milk powder in which a plurality of solutions having different components are individually spray-dried with different spray nozzles while mixing the components. ADVANTAGE OF THE INVENTION According to the method of this invention, it can manufacture efficiently, maintaining quality, flavor, and storability of powdered milk etc. which contain a metal and the polyunsaturated fatty acid containing fats and oils.

[0002]

2. Description of the Related Art Polyunsaturated compounds having 18 or more carbon atoms and three or more double bonds, such as α-linolenic acid, γ-linolenic acid, dihomo-γ-linolenic acid, arachidonic acid, eicosapentaenoic acid and docosahexaenoic acid. Fatty acids are metabolized in vivo by themselves or prostaglandins, and exhibit physiological effects such as blood pressure regulation, hormone secretion regulation, cholesterol concentration regulation, soybean oil containing these polyunsaturated fatty acids, Attempts have been made to use oils and fats such as evening primrose oil, perilla oil, perilla oil and fish oil in nutritional foods, functional foods, pharmaceuticals, cosmetics, feeds, and the like.

[0003] However, these polyunsaturated fatty acids have a disadvantage that they are very easily oxidized by heat, light, oxygen and the like. Since it is produced, it has been extremely difficult to produce nutritious foods, functional foods, pharmaceuticals, cosmetics, feeds, and the like, using oils and fats containing these polyunsaturated fatty acids.

[0004] Therefore, various proposals have been made for the purpose of preventing oxidation of fats and oils containing these polyunsaturated fatty acids and foods and the like containing the fats and oils. For example, a method of adding an antioxidant, an antioxidant synergist, or the like to a polyunsaturated fatty acid-containing fat or oil (JP-A-60-192547, JP-A-61-212243, JP-A-2-166194) Gazette, Japanese Patent Laid-Open No. 5-
No. 140584), and a method of transesterifying a polyunsaturated fatty acid-containing fat and oil, particularly fish oil which is remarkably oxidatively degraded, with a saturated fatty acid (JP-A-8-269477).

By the way, when the fats and oils containing polyunsaturated fatty acids come into contact with metals such as iron, copper and zinc in a solution state,
In addition to the generation of off-flavors peculiar to metals such as iron, copper and zinc, polyunsaturated fatty acids are easily oxidized and return odor of fats and oils is generated. These polyunsaturated fatty acid-containing fats and oils and iron,
In foods in which metals such as copper and zinc coexist, the conventional use of antioxidants and the like and stabilization of fats and oils themselves cannot suppress quality deterioration such as return odor of fats and oils for a long time.

As a method for suppressing the return odor, there is disclosed a method of adding a masking agent such as lecithin having an antioxidant effect (Japanese Patent Laid-Open No. 3-130042), but it has an odor peculiar to the masking agent itself. In some cases, this is a problem, and there is a problem that foods that can use this technology are limited. Furthermore, when producing oil-and-fat-containing milk powder, iron / copper that promotes oxidation of unsaturated fatty acids containing O / W emulsion containing unsaturated fatty acids and fats and oils,
A method for preventing oxidation by separately concentrating solutions containing metals such as zinc and spray-drying them, and then mixing them individually (Japanese Patent Laid-Open No.
245698) are also disclosed. However, there is a problem in that mixing the powder obtained by spray drying requires a great deal of labor and equipment.

On the other hand, polyunsaturated fatty acids having various physiological actions in a living body are substances which are present in very small amounts as constituents of the living body and which are indispensable for normal growth and maintenance of the living body. It is very useful to provide foods that coexist with certain metals such as iron, copper and zinc. However, there has been a problem that polyunsaturated fatty acids are easily oxidized and deteriorated by contact with metals such as iron, copper and zinc. For example, if divalent metal ions (new pediatric medicine 3A pediatric nutrition I, Nakayama Shoten, 1998), which are said to be highly absorbable to the human body, are used, the addition of an antioxidant alone will result in multivalent ions. The oxidation of unsaturated fatty acids cannot be suppressed, and due to the strong oxidation catalytic ability of divalent metal ions,
There is a disadvantage that polyunsaturated fatty acids are easily oxidatively degraded in a solution.

[0008]

SUMMARY OF THE INVENTION The present inventors have conventionally
With regard to the method of producing powdered milk containing metal and fats and oils containing polyunsaturated fatty acids, which had been produced by powder mixing, intensive research is underway to establish a technology that can be produced simply and efficiently. However, by mixing the components while spray-drying the solution containing the polyunsaturated fatty acid-containing fat and oil and the solution containing the metal separately with different spray nozzles, the same quality, flavor and taste as those of the conventional powder mixture are obtained. It has been found that powdered milk having preservability can be produced. And when spray-drying a plurality of solutions having different components individually with different spray nozzles,
By adjusting the angle and distance of the spray nozzle and spray-drying so that each spray umbrella overlaps, it has been found that powdered milk having better dispersibility and classification of components can be produced, and the present invention is completed. Reached.

Accordingly, the present invention provides a method for producing milk powder in which a plurality of solutions having different components are individually spray-dried with different spray nozzles while mixing the components. It is an object of the present invention to provide a method for producing powdered milk in which components are mixed while spray-drying so that the spray umbrellas overlap.

[0010]

According to the present invention, a multi-nozzle spray method (J. of the Society o) is a technique for spray-drying a single solution of uniform components efficiently with a plurality of spray nozzles.
f Dairy Technology, vol. 43, 1990), which mixes ingredients while spray-drying multiple solutions with different ingredients individually with different spray nozzles to produce milk powder. In particular, in the present invention, a technique of spraying a plurality of solutions having different components from different spray nozzles by using high-pressure pumps of different lines and mixing the components while drying is novel. The components that are affected upon contact can be individually spray dried to produce a powdered milk in which the components are uniformly mixed.

In addition, when a plurality of solutions having different components are individually spray-dried with different spray nozzles and the components are mixed to produce milk powder, the angle and distance of the spray nozzles are adjusted, and each spray umbrella is adjusted. By spray-drying so as to overlap with each other, powdered milk having better dispersibility and classification can be produced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a plurality of solutions having different components are sprayed from different spray nozzles using high-pressure pumps of different lines, and the components are mixed while being dried. Produces good milk powder.

For example, the case of producing milk powder containing a metal and a fat containing a polyunsaturated fatty acid by the method of the present invention will be described. First, a solution containing polyunsaturated fatty acid-containing fats and oils is used as an O / W emulsified concentrate, and a solution containing metals such as iron, copper, and zinc that promote oxidation of polyunsaturated fatty acids is separately prepared. Each solution is sprayed from a different spray nozzle using a different line high-pressure pump, and the ingredients are mixed while drying to obtain a polyunsaturated fatty acid containing a metal having good quality, flavor and storage stability. Produces milk powder containing fats and oils.

In the present invention, the proteins used as the raw materials of the milk powder include casein, whey protein concentrate (WPC), whey protein isolate (WPI), α _s -casein, β-casein,
Milk proteins and milk protein fractions such as α-lactalbumin and β-lactoglobulin, animal proteins such as egg proteins, soybean proteins, vegetable proteins such as wheat proteins, and these proteins are variously treated with enzymes and the like. Peptides decomposed to a chain length, and amino acids such as taurine, cystine, cysteine, arginine and glutamine can be used alone or in combination.

In the present invention, the fats and oils used as the raw material of the milk powder include milk fat, lard, beef tallow, fish oil and other animal fats and oils, soybean oil, rapeseed oil, corn oil, coconut oil, palm oil, palm kernel oil, coconut oil Flower oil, perilla oil, linseed oil, evening primrose oil,
Vegetable oils and fats such as MCT and cottonseed oil, and their fractionated oils, hydrogenated oils, and transesterified oils can be used alone or in combination.

In the present invention, the carbohydrates used as raw materials for powdered milk include starch, soluble polysaccharides, dextrin, sucrose,
Oligosaccharides such as lactose, maltose, glucose, galactooligosaccharides, fructooligosaccharides, lactulose, and artificial sweeteners can be used alone or in combination. In addition, vitamins and minerals can be used as raw materials for milk powder.

These substances are either O / W emulsified concentrates containing fats and oils containing polyunsaturated fatty acids, or solutions containing metals such as iron, copper and zinc, and a solution which does not adversely affect either. And the method of the present invention may be carried out. Note that, as a precaution for uniformly mixing the components while spraying and drying from individual spray nozzles, it is necessary to keep the spray ratio of each solution to be sprayed constant and to simultaneously start and end spraying. Therefore, from the total amount of each solution, calculate the spray ratio per unit time,
It is necessary to appropriately select an orifice and a core to be incorporated in the spray nozzle. Further, for the spray nozzle, it is preferable to adjust the angle and the distance and spray-dry such that each spray umbrella overlaps by 1% to 90%, and the overlap of each spray umbrella is 1 to 60%. More preferred.

The fats and oils containing polyunsaturated fatty acids to be used in the present invention include carbon oils such as α-linolenic acid, γ-linolenic acid, dihomo-γ-linolenic acid, arachidonic acid, eicosapentaenoic acid and docosahexaenoic acid. The number is not particularly limited as long as it contains a polyunsaturated fatty acid having 18 or more and three double bonds. For example, soybean oil, evening primrose oil, borage oil, blackcurrant oil, perilla oil, perilla oil,
Examples include fish oil, yolk phospholipid extract, and microbial fermentation products.

Further, the metal which is an object of the present invention includes:
Copper sulfate, cupric carbonate, cupric citrate, copper salts such as cupric sulfate and copper gluconate, ferrous carbonate, ferrous fumarate,
Ferrous succinate, ferric chloride, ferrous citrate, ferric citrate, sodium ferrous citrate, ammonium ammonium citrate, ferrous gluconate, ferric gluconate, ferrous lactic acid Iron, hydrogen reduced iron, electrolytic iron, carbonyl iron, ferrous pyrophosphate, ferric pyrophosphate, iron salts such as sodium ferric pyrophosphate and ferrous sulfate, zinc acetate, zinc chloride, zinc oxide, glucone Examples thereof include zinc salts such as zinc acid and zinc sulfate.

The powdered milk containing the metal and the fat containing the polyunsaturated fatty acid thus obtained is a very preferable product in terms of quality, flavor and storage stability, and this product is stable for a long time. Quality was maintained.

Next, the present invention will be described in detail with reference to Examples and Test Examples.

Example 1 A solution of 8.8 kg of whey protein concentrate (WPC) and 52 kg of lactose in 200 kg of water was added to 75 kg of milk and 3.9 kg of casein dissolved with alkali, and water-soluble vitamin components (vitamin B ₁ and vitamin B _2). , Niacin, vitamin B ₆ , biotin, folic acid, pantothenic acid, vitamin B ₁₂ ,
1.45 kg of vitamin C, choline and inositol and mineral components (calcium, phosphorus, chlorine, magnesium, potassium, iodine, manganese and selenium), and fat-soluble vitamins (vitamin A, β-carotene, vitamin D, vitamin E and vitamins) K) and 25 kg of fats and oils containing polyunsaturated fatty acids (soybean oil, evening primrose oil and fish oil) containing antioxidants (vitamin C palmitate, lecithin and tocopherol), mix, homogenize and heat sterilize. Thus, 247 kg of an O / W emulsified concentrate containing polyunsaturated fatty acid-containing fats and oils concentrated to a solid content of 40% was obtained. On the other hand, 5% containing 1 kg of casein dissolved in alkali
A casein solution having a concentration is prepared.
0.05 kg of copper, iron and zinc were dissolved in water and added to obtain 25 kg of a 4% strength metal-bound casein solution.

The O / O containing the polyunsaturated fatty acid-containing oil / fat
Each of the spray nozzles (Type SX SPR) installed at the top of the dryer at a liquid volume ratio of W emulsified concentrate and metal-bound casein solution of 91: 9
AYDRY NOZZLE and SPRAYING SYSTEM'S CO.) Were sprayed using high pressure pumps on separate lines. In addition, each spray nozzle was installed with its angle and distance adjusted so that the overlap of each spray umbrella was about 60%. In addition,
At the time of spraying, O /
Spray nozzle of W emulsified concentrate is orifice No54 and core No.
The orifice No. 71 and the core No. 16 were spray nozzles of the metal-bound casein solution, and the spray pressure in a steady state was 140 kg / cm ² . And 100 kg of milk powder containing metals such as copper, iron and zinc and fats and oils containing polyunsaturated fatty acids
Was manufactured.

[0023]

EXAMPLE 2 6.1 kg of casein dissolved with alkali in a solution obtained by adding 9.4 kg of whey protein concentrate (WPC) and 55 kg of lactose to 300 kg of water, water-soluble vitamin components (vitamin B ₁ ,
Vitamin B ₂ , niacin, vitamin B ₆ , biotin,
Folic acid, pantothenic acid, vitamin B _12, vitamin C, choline and inositol) and mineral components (calcium,
1.95 kg of phosphorus, chlorine, magnesium, potassium, iodine, manganese and selenium, plus fat-soluble vitamins (vitamin A, β-carotene, vitamin D, vitamin E and vitamin K) and antioxidants (vitamin C palmitate, 27.8 kg of fats and oils containing polyunsaturated fatty acids (lecithin and tocopherol) (soybean oil, evening primrose oil, fish oil and fermented microbial products) are added, mixed, homogenized, and heat-sterilized to obtain a solid content of 40%. Thus, 247 kg of an O / W emulsified concentrate containing polyunsaturated fatty acid-containing fats and oils concentrated until the concentration reached 247 kg was obtained. On the other hand, 5% containing 1 kg of casein dissolved in alkali
A casein solution having a concentration is prepared.
0.05 kg of copper, iron and zinc were dissolved in water and added to obtain 25 kg of a 4% strength metal-bound casein solution.

O / O containing this polyunsaturated fatty acid-containing fat or oil
Each of the spray nozzles (Type SX SPR) installed at the top of the dryer at a liquid volume ratio of W emulsified concentrate and metal-bound casein solution of 91: 9
AYDRY NOZZLE and SPRAYING SYSTEM'S CO.) Were sprayed using high pressure pumps on separate lines. Further, each spray nozzle was installed with its angle and distance adjusted so that the overlap of each spray umbrella was about 90%. In addition,
At the time of spraying, O /
Spray nozzle of W emulsified concentrate is orifice No54 and core No.
The orifice No. 71 and the core No. 16 were spray nozzles of the metal-bound casein solution, and the spray pressure in a steady state was 140 kg / cm ² . And 100 kg of milk powder containing metals such as copper, iron and zinc and fats and oils containing polyunsaturated fatty acids
Was manufactured.

[0025]

Example 3 6.1 kg of casein dissolved in alkali by adding 9.4 kg of whey protein concentrate (WPC) and 55 kg of lactose to 300 kg of water, water-soluble vitamin components (vitamin B ₁ ,
Vitamin B ₂ , niacin, vitamin B ₆ , biotin,
Folic acid, pantothenic acid, vitamin B _12, vitamin C, choline and inositol)及mineral components (calcium, phosphorus, chlorine, magnesium, potassium, iodine, manganese and selenium) 1.95 kg, further fat-soluble vitamins (vitamin A, beta- Add 27.6kg of fats and oils containing polyunsaturated fatty acids (soybean oil, evening primrose oil, fish oil and egg yolk phospholipid extract) containing carotene, vitamin D, vitamin E and vitamin K), mix, homogenize and heat sterilize And O / O containing polyunsaturated fatty acid-containing fats and oils concentrated to a solid content of 40%
247 kg of W emulsion concentrate was obtained. On the other hand, a 5% casein solution containing 1 kg of casein dissolved in alkali was prepared,
To this casein solution, 0.05 kg of copper, iron, and zinc dissolved in water was added to obtain 25 kg of a 4% concentration metal-bound casein solution.

O / O containing the polyunsaturated fatty acid-containing fat or oil
Each of the spray nozzles (Type SX SPR) installed at the top of the dryer at a liquid volume ratio of W emulsified concentrate and metal-bound casein solution of 91: 9
AYDRY NOZZLE and SPRAYING SYSTEM'S CO.) Were sprayed using high pressure pumps on separate lines. Further, each spray nozzle was installed with its angle and distance adjusted so that the overlap of each spray umbrella was about 90%. In addition,
At the time of spraying, O /
Spray nozzle of W emulsified concentrate is orifice No54 and core No.
The orifice No. 71 and the core No. 16 were spray nozzles of the metal-bound casein solution, and the spray pressure in a steady state was 140 kg / cm ² . And 100 kg of milk powder containing metals such as copper, iron and zinc and fats and oils containing polyunsaturated fatty acids
Was manufactured.

[0027]

Example 4 Into 240 kg of skim milk to which 7.5 kg of whey protein concentrate (WPC) and 40.3 kg of lactose were added, 70 g of casein dissolved with alkali, water-soluble vitamin components (vitamin B ₁ , vitamin B ₂ , niacin, vitamin B _6, biotin, folic acid, pantothenic acid, vitamin B _12, vitamin C, choline and inositol) and mineral components (calcium, phosphorus, chlorine, magnesium, potassium, iodine, manganese and selenium) 0.65 kg, further fat-soluble vitamins ( Fats and oils containing polyunsaturated fatty acids (soybean oil, evening primrose oil, fish oil, microbial fermentation products and egg yolk phosphorus including vitamin A, β-carotene, vitamin D, vitamin E and vitamin K) and antioxidants (lecithin and tocopherol) Lipid extract)
Add 28.1 kg, mix, homogenize, heat sterilize,
247 kg of an O / W emulsified concentrate containing polyunsaturated fatty acid-containing fats and oils concentrated to a solid content of 40% was obtained. Meanwhile, lactose
Prepare a 16% lactose solution containing 3.75 kg, add copper, iron and zinc 0.05 kg dissolved in water to this lactose solution and add
25 kg of a metal-containing lactose solution with a concentration of 25% were obtained.

The O / O containing the polyunsaturated fatty acid-containing fat or oil
Each of the spray nozzles (Type SX SPRAY) installed above the dryer at a liquid volume ratio of W emulsified concentrate and metal-containing lactose solution of 91: 9
DRY NOZZLE, SPRAYING SYSTEM'S CO.), And sprayed using high pressure pumps on separate lines. Further, each spray nozzle was installed with its angle and distance adjusted so that the overlap of each spray umbrella was about 90%. At the time of spraying, O / W containing polyunsaturated fatty acid-containing fats and oils was used.
Nozzle No. 54 and Core No. 21 for spray nozzle of emulsified concentrate
The spray nozzle for the lactose solution containing metal is orifice No71.
And for core No. 16, the spray pressure in the steady state is 140
kg / cm ² . Then, 100 kg of milk powder containing metals such as copper, iron and zinc and fats and oils containing polyunsaturated fatty acids was produced.

[0029]

Example 5 With respect to the O / W emulsified concentrate containing a polyunsaturated fatty acid-containing fat and oil and the metal-bound casein solution obtained in the same manner as in Example 2, the overlap of the spray umbrellas was 95%.
Spray drying in the same manner as in Example 2 except that each spray nozzle was installed by adjusting the angle and distance so that
100 kg of milk powder containing metals such as copper, iron and zinc and fats and oils containing polyunsaturated fatty acids was produced.

[0030]

COMPARATIVE EXAMPLE 1 An O / W emulsified concentrate containing a polyunsaturated fatty acid-containing fat and oil obtained in the same manner as in Example 1 and a metal-bound casein solution were mixed, followed by spray drying and copper, iron, zinc, etc. 100 kg of powdered milk containing the above metals and fats and oils containing polyunsaturated fatty acids was produced.

[0031]

Comparative Example 2 75 kg of milk and 4.9 kg of alkali-dissolved casein were added to a solution obtained by adding 8.8 kg of whey protein concentrate (WPC) and 45 kg of lactose to 200 kg of water, and water-soluble vitamin components (vitamin B ₁ and vitamin B _2). , Niacin, vitamin B ₆ , biotin, folic acid, pantothenic acid, vitamin B ₁₂ ,
1.45 kg of vitamin C, choline and inositol and mineral components (calcium, phosphorus, chlorine, magnesium, potassium, iodine, manganese and selenium), and fat-soluble vitamins (vitamin A, β-carotene, vitamin D, vitamin E and vitamins) K) and 25.2 kg of fats and oils containing polyunsaturated fatty acids (soybean oil, evening primrose oil, fish oil and egg yolk phospholipid extract) containing antioxidants (vitamin C palmitate, lecithin and tocopherol), mix and homogenize O / W containing polyunsaturated fatty acid-containing fats and oils concentrated by heating and sterilizing until the solid content becomes 40%.
The emulsified concentrate was spray-dried to obtain 93 kg of milk powder containing fats and oils containing polyunsaturated fatty acids. On the other hand, lactose 7kg, copper, iron and zinc
After mixing 0.05 kg and uniformly dispersing, 0.055 g of powdered sugar containing iron, copper and zinc was obtained by sufficiently pulverizing with a pulverizer. Then, the powdered milk containing the polyunsaturated fatty acid-containing fat and oil and the powdered sugar containing iron, copper and zinc are mixed together, and the powdered milk containing the metal such as copper, iron and zinc and the polyunsaturated fatty acid-containing fat and oil are mixed.
100 kg was manufactured.

[0032]

Test Example 1 The powdered milk obtained in Comparative Example 1 was spray-dried as a single solution, so that iron, which is a trace component,
There is no problem in the dispersibility of copper and zinc, but for the milk powder obtained in Examples 1 to 5 and the milk powder obtained in Comparative Example 2, the dispersibility of iron, copper and zinc, which are trace components, was confirmed. Need to be kept. Therefore, for each of the milk powders obtained in Example 1, Example 2 and Comparative Example 2, three points (A
(Points, B and C) were sampled and analyzed for iron, copper and zinc content. Table 1 shows the results.

[0033]

[Table 1] 鉄 Iron content Copper content Zinc content ──── ──── ──────── 点 Point A Point B Point C Point A Point B Point C Point A Point B Point C Point ──────────── ──────────────────────── Example 1 5.98 6.01 6.10 0.37 0.35 0.35 2.70 2.65 2.74 Example 2 6.23 6.22 6.30 0.32 0.38 0.38 2.61 2.51 2.50 Comparative example 2 6.13 6.13 6.02 0.35 0.36 0.36 2.54 2.59 2.51 ──────────────────────────────────── (Unit: mg %)

Each of the milk powders obtained in Example 1 and Example 2 was sieved into two types of mesh-up and mesh-under with a 150 μm mesh sieve.
The contents of iron and copper were analyzed. Table 2 shows the results.

[0035]

[Table 2]

According to the results of these analyses, it is understood that the dispersion state of iron, copper and zinc, which are minor components, in each of the milk powders obtained in Example 1, Example 2 and Comparative Example 2 is good. In addition, it can be seen that the classification of iron and copper, which are trace components in each of the milk powders obtained in Example 1 and Example 2, was also good. Therefore, it can be said that there is no problem in terms of the dispersibility and the classification even when the solutions of different components are spray-dried from different spray nozzles using the high-pressure pumps of different lines, respectively, in the usual multi-nozzle spray method.

[0037]

Test Example 2 Each of the powdered milks obtained in Examples 1 to 5 and Comparative Examples 1 and 2 was filled into a 350 ml white plain steel can, and then forcibly degraded and stored in a dark place at 37 ° C. under open air. Samples were collected over time, and the sensory evaluation for odor and the measurement of peroxide value (POV) were performed. The sensory evaluation was 10
5 panelists who did not see any oxidative deterioration were rated as 1 point by the name panelists, and 1 panel was used when the oxidative deterioration was obvious. The POV was measured in accordance with the JOCS method (Japan Association of Fats and Oil Chemistry, Standard Fat and Oil Analysis Test Method 2.4.12-71, Maruzen, 1971). Table 3 shows the results.

[0038]

[Table 3] ──────────────────────────────────── Storage period (week) ───── {0 1 2 3 4 5} ─────────── Example 1 Flavor 5.0 5.0 4.9 4.8 4.7 4.6 POV 0.4 0.5 0.6 0.8 0.9 1.0 ────────────────────── ────────────── Example 2 Flavor 5.0 4.9 4.8 4.6 4.4 4.3 POV 0.5 0.6 0.7 0.9 1.0 1.1 ─────────────────── ───────────────── Example 3 Flavor 5.0 4.9 4.7 4.7 4.5 4.4 POV 0.5 0.5 0.7 0.9 1.1 1.2 ──────────────── ──────────────────── Example 4 Flavor 5.0 4.9 4.6 4.4 4.3 4.1 POV 0.6 0.8 0.9 1.0 1.2 1.3 ─── ──────────────────────────────── Example 5 Flavor 4.9 4.4 4.2 3.9 3.7 3.5 POV 0.7 1.5 2.0 2.7 3.5 4.3 ─ ─────────────────────────────────── Comparative Example 1 Flavor 4.8 4.2 3.9 3.6 3.1 2.6 POV 0.8 1.8 2.2 3.5 4.6 5.1 比較 Comparative Example 2 Flavor 5.0 5.0 4.8 4.7 4.6 4.5 POV 0.4 0.4 0.6 0.9 1.1 1.1 ──────────────────────────────────── (Unit of POV: meq / kg)

According to this, the powdered milk of Comparative Example 1 spray-dried as a single solution was clearly more susceptible to oil return smell than the powdered milk of Comparative Example 2 and the PO powder had a higher PO.
The increase in V indicates that the oxidative deterioration of the polyunsaturated fatty acid contained in the milk powder is progressing. On the other hand, the milk powders of Examples 1 to 4 were similar to the milk powders of Comparative Example 2 which were shattered, and compared with the milk powder of Comparative Example 1 which was spray-dried as a single solution, few people felt the lipid oxidative deterioration smell, It can be seen that the oxidative deterioration of the polyunsaturated fatty acids contained in the milk powder is suppressed. However, in the milk powder of Example 5,
The return odor of the oil was slightly felt, and the oxidative deterioration of the polyunsaturated fatty acid was also progressing. Therefore, in the multi-nozzle spray-drying method, when the solutions of different components are spray-dried from different spray nozzles using different lines of high-pressure pumps, respectively, the overlap of the spray umbrellas of Examples 2 to 4 is not more than the overlap. If so, it can be said that there is no problem in terms of flavor and oxidative deterioration of polyunsaturated fatty acids.

[0040]

According to the method of the present invention, as in the case of the conventional powdery mixing, even if polyunsaturated fatty acids having high nutritional value and biological activity and iron, copper and zinc having high oxidizing power coexist. Further, it is possible to provide powdered milk containing metals such as copper, iron and zinc, which hardly deteriorate in flavor and quality during long-term storage, and fats and oils containing polyunsaturated fatty acids. Moreover, the method of the present invention requires less production steps than conventional powder mixing,
It has the advantage that powdered milk containing metals such as iron and zinc and fats and oils containing polyunsaturated fatty acids can be efficiently produced.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Norifumi Sato, Inventor 4-1 Matsugaoka, Tsurugashima-shi, Saitama 13-304, Kawaturu Green Town Matsugaoka 13-304 (72) Inventor, Tadashi Imoda 513-7F, Omuro, Kawagoe-shi, Saitama Terms (reference) 3L113 AC45 AC46 AC48 AC61 AC63 AC67 AC90 BA02 DA24 4B001 AC15 AC46 BC04 DC01 EC01 EC09

Claims (4)

[Claims] 1. A method for producing milk powder, wherein a plurality of solutions having different components are individually spray-dried with different spray nozzles while mixing the components. 2. Adjusting the angle and distance of the spray nozzle,
2. The spray drying method according to claim 1, wherein the spray umbrellas are spray-dried so as to overlap each other.
Production method described in 1. 3. The overlap of each spray umbrella is 1% to 90%.
The production method according to claim 2, wherein 4. The method according to claim 1, wherein the plurality of solutions having different components are a solution containing a polyunsaturated fatty acid-containing oil and fat and a solution containing a metal.