CN111227046B - Application of dairy product in improving infant intestinal SIgA level - Google Patents
Application of dairy product in improving infant intestinal SIgA level Download PDFInfo
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- CN111227046B CN111227046B CN202010104555.6A CN202010104555A CN111227046B CN 111227046 B CN111227046 B CN 111227046B CN 202010104555 A CN202010104555 A CN 202010104555A CN 111227046 B CN111227046 B CN 111227046B
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- bifidobacterium
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- Dairy Products (AREA)
Abstract
The invention belongs to the field of food or medicine, and discloses application of a dairy product in preparing food or medicine for improving the level of infant intestinal SIgA, or preparing food or medicine for preventing or treating immune diseases or gastrointestinal diseases caused by abnormal infant intestinal SIgA level; wherein the dairy product comprises: a protein-providing material, a fat-providing material and bifidobacteria; wherein the raw material for providing protein is selected from animal milk, milk powder, whey protein powder and beta-casein, and the raw material for providing protein at least contains a-whey protein and beta-casein; the raw material for providing the fat at least contains palmitic acid glyceride, and the palmitic acid glyceride contains more than 15% by weight of Sn-2 palmitic acid glyceride calculated by the palmitic acid; the Bifidobacterium is selected from at least one of Bifidobacterium lactis, bifidobacterium animalis, bifidobacterium longum, bifidobacterium breve, bifidobacterium adolescentis, bifidobacterium bifidum and Bifidobacterium infantis.
Description
Technical Field
The invention belongs to the field of food or medicine, and particularly relates to an application of a dairy product in improving the intestinal SIgA level of infants.
Background
Secretory immunoglobulin A (SIgA) is an important immune substance in breast milk, has the functions of resisting acid, being not easy to be hydrolyzed by proteases in the digestive tract, being capable of being combined with digestive tract mucosal cells to effectively protect the mucosa and the like, and plays an immune role in the digestive tract of infants. SIgA is an important influencing factor in the improvement of the immune system in infants. Researches show that the infant formula can improve the intestinal SIgA level of infants and reduce the risks of immunological diseases and gastrointestinal diseases, such as allergy, inflammatory bowel disease and the like [1] . Celiac disease is an autoimmune disease with heredity and occurs in the small intestine, and symptoms include chronic diarrhea, growth retardation, fatigue, etc. caused by the attack of the small intestine villi by the immune system. The clinical research finds that [2] While the intestinal microbiota of healthy infants is characterized by an increased bacterial diversity, infants with celiac disease excrete lower amounts of SIgA, with markedly abnormal levels of SIgA. It also proves that [3] The dynamic balance of SIgA and intestinal microbiota can make the immune system of human body operate well, effectively resist infection and disease, and avoid the initiation of autoimmune disease. The infant with rotavirus enteritis can achieve the treatment effect after taking the immunoglobulin auxiliary probiotics, and gradually recover the abnormal SIgA level caused by bacterial infection [4] 。
At present, there is a need for a food or a medicine capable of improving the SIgA level in the infant intestinal tract, and preventing or treating immune diseases or gastrointestinal diseases caused by abnormal SIgA level in the infant intestinal tract.
The breast milk fat provides 45-60% of energy for the early growth of infants, and more than 98% of the breast milk fat is triglyceride. The positions of different fatty acids in the breast milk esterified with glycerol are different; wherein unsaturated fatty acids such as linoleic acid and alpha-linolenic acid in the breast milk are more than 1 site and 3 sites of the triglyceride; long chain saturated fatty acids such as palmitic acid in breast milk are mainly located at the 2-position, and thus formed palmitic acid triglyceride is called Sn-2 palmitic acid triglyceride. In the digestive tract, the lipolytic enzymes of the infant's stomach act primarily on the 1-and 3-ester bonds of triglycerides, so that unsaturated fatty acids are first freed and then degraded and absorbed in the duodenum along with Sn-2 palmitic acid monoglyceride. However, the common infant formula powder contains palm oil, most of long-chain saturated fatty acids of the palm oil are esterified on ester bonds at the 1-position and the 3-position of triglyceride, and the palm oil is easy to combine with calcium ions after hydrolysis to form calcium soap, so that the absorption of fat and mineral substances is reduced, and the calcium soap which is difficult to absorb can also cause hard excrement to cause difficult defecation. The national standard GB14880 allows OPO structural ester to be added into infant formula powder, which is a food raw material rich in Sn-2 palmitic acid triglyceride, and the content of Sn-2 palmitic acid triglyceride in the product can be increased by adding the OPO structural ester. Animal studies comparing the effect of feeding different proportions of SN-2 palmitic acid (40% in 12% vs higher by 56%) on the intestinal microbiota of rats, 16 srna sequencing results showed no significant difference in the composition of the intestinal microbiota of the three groups of animals.
Breast milk is rich in a-lactalbumin, a protein rich in essential amino acids, which is digested to produce a variety of biologically active polypeptides. Researches show that the a-lactalbumin digestion product can inhibit pathogenic bacteria such as escherichia coli, pneumococcus, staphylococcus aureus, candida and the like in vitro.
Beta-casein is a casein molecule with the highest content in breast milk, and a polypeptide fragment generated by digestion has the effect of inhibiting the growth of harmful bacteria.
Probiotics are an important component of the gut microbiota. The definitions of probiotics by the world Food and Agriculture Organization (FAO) and the World Health Organization (WHO) are: live bacteria which can exert an effective effect on the health of the consumer can be ingested in an appropriate amount. The bifidobacterium is one of probiotics, and the currently common bifidobacterium strains comprise bifidobacterium lactis, bifidobacterium animalis, bifidobacterium longum, bifidobacterium breve, bifidobacterium adolescentis, bifidobacterium bifidum, bifidobacterium infantis and the like, and a plurality of novel strains.
Disclosure of Invention
The invention provides an application of a dairy product in improving the infant intestinal SIgA level or preventing or treating immune diseases or gastrointestinal diseases caused by abnormal infant intestinal SIgA level.
The invention relates to an application of a dairy product in preparing food or medicine for improving the SIgA level of infant intestinal tracts or preparing food or medicine for preventing or treating immune diseases or gastrointestinal diseases caused by abnormal SIgA level of infant intestinal tracts; wherein,
the dairy product, comprising: a protein-providing material, a fat-providing material and bifidobacteria; wherein,
the raw material for providing protein is selected from animal milk, milk powder, whey protein powder and beta-casein, and the raw material for providing protein at least contains a-whey protein and beta-casein;
the fat-providing raw material contains at least palmitic acid glyceride, and the palmitic acid glyceride contains 15% or more (for example, 18% or more, 20% or more, 15% to 98%, 15% to 90%, 20% to 80%, 20% to 95%, 30%, 40%, 50%, 60%, 70%) by weight of Sn-2 palmitic acid glyceride;
the Bifidobacterium is selected from at least one of Bifidobacterium lactis, bifidobacterium animalis, bifidobacterium longum, bifidobacterium breve, bifidobacterium adolescentis, bifidobacterium bifidum and Bifidobacterium infantis.
In some embodiments of the invention, the protein providing material is 200 to 1600 parts by weight, such as 400 parts by weight, 700 parts by weight, 800 parts by weight, 900 parts by weight, 1000 parts by weight, 1200 parts by weight, 1500 parts by weight; the fat-providing raw material is 70 to 500 parts by weight, for example, 100 parts by weight, 200 parts by weight, 300 parts by weight, 400 parts by weight.
In some embodiments of the invention, the weight ratio of the a-lactalbumin, the beta-casein and the Sn-2 glyceryl palmitate in the dairy product is (1-10) to (1-10), such as 1 (1-2) to (1-2), 1 (1-5) to (1-5), (1-4) to 1 (1-5), 1 (1-7) to (1-6), 1.32.
In some embodiments of the invention, the dairy product has a viable count of bifidobacteria of 10 per gram of beta-casein 6 ～10 11 CFU, e.g. 10 7 CFU、10 8 CFU、10 9 CFU、10 10 CFU。
In some embodiments of the invention, the bifidobacteria in the dairy product are selected from the group consisting of bifidobacterium BB12 and bifidobacterium HN019.
In some embodiments of the present invention, the ratio of viable count of bifidobacterium BB12 to bifidobacterium HN019 in the dairy product is (1.
In some embodiments of the invention, the milk product is prepared from a fat-providing raw material selected from the group consisting of OPO structural fat, vegetable fat and animal fat.
In some embodiments of the invention, the vegetable oil is selected from the group consisting of sunflower oil, corn oil, rapeseed oil, and soybean oil.
In some embodiments of the invention, the fat providing feedstock comprises OPO structural fat, sunflower oil, corn oil, soybean oil and optionally rapeseed oil.
In some embodiments of the invention, the dairy product further comprises a carbohydrate-providing raw material.
In some embodiments of the invention, the carbohydrate is a carbohydrate commonly used in the art.
In some embodiments of the invention, the carbohydrate-providing source is selected from lactose, sucrose, glucose, starch and dextrin, preferably lactose.
In some embodiments of the invention, the carbohydrate-providing source is 100 to 600 parts by weight, such as 100 parts by weight, 150 parts by weight, 200 parts by weight, 250 parts by weight, 300 parts by weight, 350 parts by weight, 400 parts by weight, 450 parts by weight, 500 parts by weight, 560 parts by weight.
In some embodiments of the invention, the dairy product further comprises at least one selected from the group consisting of vitamins, minerals, dietary fiber, DHA, ARA, phospholipids, and choline chloride.
Hair brushIn some embodiments of the invention, the viable count of bifidobacteria per hundred grams of dairy product is 10 3 ～10 15 CFU, e.g. 10 4 CFU、10 5 CFU、10 7 CFU、10 8 CFU、10 9 CFU、 10 10 CFU、10 11 CFU、10 12 CFU、10 13 CFU、10 14 CFU。
In some embodiments of the invention, the dairy product comprises the following raw materials:
the dairy product contains bifidobacterium BB12 and bifidobacterium HN019, wherein the viable count of the bifidobacterium BB12 is 10 per gram of beta-casein 6 ～10 11 CFU (e.g. 10) 7 CFU、10 8 CFU、10 9 CFU、10 10 CFU), the viable count of bifidobacterium HN019 is 10 according to the weight of beta-casein per gram 6 ～10 11 CFU (e.g. 10) 7 CFU、10 8 CFU、10 9 CFU、 10 10 CFU)。
In some embodiments of the invention, the dairy product further comprises vitamins and/or minerals.
In some embodiments of the invention, the vitamin is present in an amount of 1 to 500mg per hundred grams of dairy product, e.g. 10mg, 20mg, 50mg, 100mg, 120mg, 150mg.
Some embodiments of the invention contain 10-3000 mg of minerals per hundred grams of dairy product, such as 20mg, 40mg, 60mg, 100mg, 200mg, 300mg, 400mg, 500mg, 700mg, 800mg, 1000mg, 1500mg, 2000mg, 2500mg, 3000mg.
In some embodiments of the invention, the vitamin is selected from the group consisting of vitamin A, vitamin C, vitamin D, vitamin E, vitamin K 1 Vitamin B 1 Vitamin B 2 Vitamin B 6 Vitamin B 12 Niacin, folic acid, pantothenic acid, and biotin.
In some embodiments of the invention, the mineral is selected from the group consisting of sodium, potassium, copper, magnesium, iron, zinc, calcium, phosphorus, iodine, selenium, and derivatives thereof.
Some embodiments of the invention include one or more of the following (a) to (d):
(a) The animal milk and milk powder are respectively derived from at least one mammal selected from cow, sheep, horse, deer and camel;
(b) The whey protein powder is selected from desalted whey protein powder, undesalted whey protein powder and a-whey protein powder;
preferably, the weight of the desalted whey protein powder is 1 to 20 times, for example 2, 5, 7, 9, 10, 12, 14, 15, 17, 19 times, the weight of the undesalted whey protein powder;
preferably, the weight of the undesalted whey protein powder is 0.5-40 times, such as 1, 2, 5, 10, 20, 25, 30, 35, 40 times the weight of the a-whey protein powder;
(c) The dietary fiber is selected from fructo-oligosaccharide and galacto-oligosaccharide;
preferably, the weight ratio of fructo-oligosaccharide to galacto-oligosaccharide is 1 (1-6), such as 1:2, 1:3, 1:4, 1:5;
(d) The phospholipid is soybean phospholipid.
In some embodiments of the invention, the animal milk is selected from the group consisting of raw milk, whole milk, low fat milk, and skim milk.
In some embodiments of the invention, the milk powder is selected from the group consisting of whole milk powder, low-fat milk powder, and skim milk powder, preferably whole milk powder and skim milk powder;
preferably, the weight ratio of the whole milk powder to the skim milk powder is (0.1-12) 1, such as 0.2.
In some embodiments of the invention, the dairy product comprises:
the dairy product also comprises bifidobacterium BB12 and bifidobacterium HN019, wherein the viable count of the bifidobacterium BB12 is 10 per gram of beta-casein 6 ～10 11 CFU (e.g. 10) 7 CFU、10 8 CFU、10 9 CFU、10 10 CFU), the viable count of bifidobacterium HN019 is 10 according to the weight of beta-casein per gram 6 ～10 11 CFU (e.g. 10) 7 CFU、10 8 CFU、10 9 CFU、 10 10 CFU) containing 1 to 500mg (e.g. 10mg, 20mg, 50mg, 100mg, 120mg, 150 mg) of vitamins and 10 to 3000mg (e.g. 20mg, 40mg, 60mg, 100mg, 200mg, 300mg, 400mg, 500mg, 700mg, 800mg, 1000mg, 1500mg, 2000mg, 2500mg, 3000 mg) of minerals per hundred grams of dairy product.
In some embodiments of the invention, the dairy product is prepared by:
(1-1) mixing the raw materials except for bifidobacterium, DHA and ARA to obtain a mixture;
(2-1) homogenizing the mixture to obtain a homogeneous material;
(3) Sterilizing the homogeneous material to obtain a sterilized material;
(4) Drying the sterilized material to obtain powder;
(5) And dry-mixing the powder, the bifidobacterium, the DHA and the ARA to obtain the dairy product.
Some embodiments of the invention include one or more of the following 1) to 11):
1) The method also comprises a step (1-2) between the steps (1-1) and (2-1): filtering the mixture to remove impurities, and using the obtained filtered material for homogenization treatment in the step (2-1);
2) In the step (2-1), the temperature of the homogenization treatment is 50 ℃ or higher;
3) In the step (2-1), the pressure of the homogenization treatment is 120bar or more;
4) A step (2-2) is further included between the steps (2-1) and (3): concentrating the homogenized material, and using the obtained concentrate for sterilization treatment in the step (3);
preferably, the dry matter content of the concentrate is between 40% and 60% by weight;
5) In the step (3), the temperature of the sterilization treatment is more than 80 ℃;
6) In the step (3), the time of sterilization treatment is 10-60 seconds;
7) In the step (4), before drying treatment, filtering and removing impurities from the sterilized materials;
8) In the step (4), the sterilized material is firstly introduced into a spray drying tower for primary drying, and then the material obtained by the primary drying is introduced into a fluidized bed for secondary drying to obtain powder;
preferably, the air inlet temperature of the spray drying tower is 150-200 ℃;
preferably, the air exhaust temperature of the spray drying tower is 80-120 ℃;
preferably, the negative pressure of the spray drying tower is-10 to-2 mmWG;
preferably, the sterilizing material is introduced into the spray drying tower by means of a high-pressure pump;
more preferably, the pressure of the high-pressure pump is 140 to 250bar;
9) In the step (5), the dry mixing temperature is 20-35 ℃;
10 In step (5), dry mixing is carried out by means of a fluidized bed;
11 The method further comprises step (6): the dairy product is sieved.
In some embodiments of the invention, the food product is a dairy product.
Without being bound by theory, the intestinal SIgA level of breast-fed infants is generally superior to that of infants fed by artificial methods such as formula milk powder, which is a main reason for advocating breast-feeding for many years. The improvement of the intestinal SIgA level of the infants takes the intestinal SIgA level of breast-fed infants as an improvement target, namely the intestinal SIgA level (the SIgA content and the change trend of the SIgA content along with time) of the breast-fed infants is reached or approached. The abnormal SIgA level of the intestinal tract of the infant in the invention is deviated from the SIgA level of the intestinal tract of a breast-fed infant (SIg content and change trend thereof along with time) or has obvious difference with the SIgA level of the intestinal tract of the breast-fed infant.
In some embodiments of the first aspect of the invention, the immune disorder caused by an abnormal level of SIgA in the infant's intestine is selected from allergy and celiac disease.
In some embodiments of the first aspect of the invention, the gastrointestinal disorder caused by abnormal SIgA levels in the infant's intestinal tract is selected from inflammatory bowel disease (e.g. rotavirus enteritis) and gastrointestinal mucosal injury.
In the invention, the dairy product is selected from at least one of sterilized milk, reconstituted milk, yoghourt, yogurt, milk powder, formula milk powder, condensed milk, cheese, casein, whey powder, milk fat and milk-containing beverage, and is preferably infant formula milk powder.
In the present invention, unless otherwise specified, wherein:
the term "glyceryl palmitate" refers to fatty acid glycerides having at least one palmitic acid attached to a glyceryl moiety, and may be selected from monoesters, diesters and triesters, wherein other fatty acid moieties may also be attached to the glyceryl moieties of the diesters, triesters.
The term "Sn-2 palmitic acid" refers to palmitic acid attached to the Sn-2 position on a glyceryl moiety of a fat.
The term "Sn-2 glyceryl palmitate" refers to fatty acid glycerides with palmitic acid attached to the Sn-2 position of the glyceryl moiety, and may be selected from the group consisting of Sn-2 monoglycerides, sn-2 diglycerides and Sn-2 triglycerides; wherein, any fatty acid can be connected to the Sn-1 position and/or the Sn-3 position on the glyceryl in the Sn-2 palmitic acid diglyceride and the Sn-2 palmitic acid triglyceride, and the fatty acid comprises, but is not limited to, palmitic acid, butyric acid, caproic acid, caprylic acid, capric acid, stearic acid, lauric acid, myristic acid, arachic acid, myristoleic acid, palmitoleic acid, rapeseed oleic acid, linoleic acid, linolenic acid and the like.
The term "a-lactalbumin" is a protein extracted from milk, has the characteristics of high nutritional value, easy digestion and absorption, multiple active ingredients and the like, and is one of high-quality protein supplements for human bodies.
The term "beta-casein" is a phosphorylated protein synthesized by mammary acinar epithelial cells and is widely found in the milk of mammals (cows, yaks, goats, horses, rabbits, etc.) and humans.
The term "OPO structure fat" is actually a structured fat, and the molecular structure of breast milk fat is simulated by an enzymatic lipid exchange technology, so that the proportion of 2-position palmitic acid is up to more than 40 percent and is closer to the level of breast milk.
The invention has the following beneficial effects:
the dairy product provided by the invention can improve the SIgA level of the infant intestinal tract, and prevent or treat immune diseases or gastrointestinal diseases caused by abnormal SIgA level of the infant intestinal tract.
Drawings
In order that the present disclosure may be more readily understood, a more particular description of the disclosure will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings
Fig. 1 is a graph showing SIgA levels in feces of infants in the test group, the control group, and the breast-milk group at different time points.
Detailed Description
The embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying examples, in which some, but not all embodiments of the invention are shown. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) Mixing whole milk powder, skimmed milk powder, lactose, whey protein powder (purity 80 wt.%), desalted whey powder (purity 12 wt.%), a-whey protein powder (purity 77 wt.%), OPO structure fat, high oleic sunflower seed oil, corn oil, soybean oil, galacto-oligosaccharide syrup (purity 57 wt.%), fructo-oligosaccharide (chicory source), beta-casein, soybean phospholipid, choline chloride and compound nutrients (the components are shown in tables 1-2) uniformly according to the formula in table 1-1, and removing impurities from the mixed material by using a filter screen to obtain a material after impurity removal;
(2) Homogenizing the material after removing impurities at a temperature above 55 deg.C under 120bar to obtain homogenized material, and cooling to below 20 deg.C;
(3) Concentrating the standby material to obtain a concentrate with the dry matter content of 48-52%;
(4) Sterilizing the concentrate at above 83 deg.C for 25 s to obtain sterilized material, and temporarily storing in a concentrated milk balance tank;
(5) Preheating the sterilized material in a thick milk balance tank to 60-70 ℃ by a scraper preheater, filtering by a filter with the aperture of 1mm, pumping into a drying tower by a high-pressure pump for spray drying, wherein the air inlet temperature is 165-180 ℃, the air exhaust temperature is 83-96 ℃, the pressure of the high-pressure pump is 160-210 bar, and the negative pressure of the tower is about-5 mmWG, so as to obtain powder;
(6) Further drying the powder material by a first-stage fluidized bed to obtain dry powder;
(7) Dry mixing the dry powder, DHA, ARA and two kinds of bifidobacterium powder at 25-30 ℃ through a secondary fluidized bed to obtain mixed powder;
(8) And (3) sieving the mixed powder by using a vibrating screen to obtain the formula milk powder 1 with uniform particles, and filling nitrogen for packaging.
In the formula milk powder 1, the palmitic acid glyceride contains 22% of Sn-2 palmitic acid glyceride by weight, the weight ratio of a-lactalbumin, beta-casein and Sn-2 palmitic acid glyceride is 2.4, the formula milk powder contains 1.6wt.% of a-lactalbumin, and the sum of the viable count of two bifidobacteria is 2 multiplied by 10 according to the weight of each gram of a-lactalbumin 7 CFU。
Table 1-1 formulation of example 1
Table 1-2 ingredients contained in the Complex Nutrients
Example 2
(1) Mixing whole milk powder, skimmed milk powder, lactose, whey protein powder (purity 34 wt.%), desalted whey powder (purity 12 wt.%), a-whey protein powder (purity 77 wt.%), OPO structure fat, high-oleic sunflower seed oil, corn oil, soybean oil, galacto-oligosaccharide syrup (purity 57 wt.%), fructo-oligosaccharide (chicory source), beta-casein, soybean phospholipid, choline chloride and compound nutrients (the components are shown in Table 2-2) uniformly according to the formula in Table 2-1, and removing impurities from the mixed material by using a filter screen to obtain a material after impurity removal;
(2) Homogenizing the material after removing impurities at a temperature above 55 deg.C under 120bar to obtain homogenized material, and cooling to below 20 deg.C;
(3) Concentrating the standby materials to obtain a concentrate with the dry matter content of 48-52%;
(4) Sterilizing the concentrate at above 83 deg.C for 25 s to obtain sterilized material, and temporarily storing in a concentrated milk balance tank;
(5) Preheating the sterilized material in a thick milk balance tank to 60-70 ℃ by a scraper preheater, filtering by a filter with the aperture of 1mm, pumping into a drying tower by a high-pressure pump for spray drying, wherein the air inlet temperature is 165-180 ℃, the air exhaust temperature is 83-96 ℃, the pressure of the high-pressure pump is 160-210 bar, and the negative pressure of the tower is about-5 mmWG, so as to obtain powder;
(6) Further drying the powder material by a first-stage fluidized bed to obtain dry powder;
(7) Dry mixing the dry powder, DHA, ARA and two kinds of bifidobacterium powder at 25-30 ℃ through a secondary fluidized bed to obtain mixed powder;
(8) And (3) sieving the mixed powder by using a vibrating screen to obtain the formula milk powder 2 with uniform particles, and filling nitrogen for packaging.
In the formula milk powder 2, the palmitic acid glyceride contains 22% of Sn-2 palmitic acid glyceride by weight, the weight ratio of a-lactalbumin, beta-casein and Sn-2 palmitic acid glyceride is 2.5 7 CFU。
TABLE 2-1 formulation of example 2
TABLE 2-2 ingredients contained in the Complex Nutrients
Comparative example
(1) Mixing whole milk powder, skimmed milk powder, lactose, whey protein powder (purity 80 wt.%), desalted whey powder (purity 12 wt.%), OPO structure fat, high oleic sunflower seed oil, corn oil, soybean oil, rapeseed oil, galacto-oligosaccharide syrup (purity 57 wt.%), fructo oligosaccharide (from chicory), soybean phospholipid, choline chloride and compound nutrients (the components are shown in table 3-2) uniformly according to the formula in table 3-1, and removing impurities by using a mixed material filter screen to obtain an impurity-removed material;
(2) Homogenizing the material after removing impurities at a temperature above 55 deg.C under 120bar to obtain homogenized material, and cooling to below 20 deg.C;
(3) Concentrating the standby materials to obtain a concentrate with the dry matter content of 48-52%;
(4) Sterilizing the concentrate at above 83 deg.C for 25 s to obtain sterilized material, and temporarily storing in a concentrated milk balance tank;
(5) Preheating the sterilized material in a thick milk balance tank to 60-70 ℃ by a scraper preheater, filtering by a filter with the aperture of 1mm, pumping into a drying tower by a high-pressure pump for spray drying, wherein the air inlet temperature is 165-180 ℃, the air exhaust temperature is 83-96 ℃, the pressure of the high-pressure pump is 160-210 bar, and the negative pressure of the tower is about-5 mmWG, so as to obtain powder;
(6) Further drying the powder material by a first-stage fluidized bed to obtain dry powder;
(7) Dry mixing the dry powder, DHA and ARA at 25-30 ℃ by a secondary fluidized bed to obtain mixed powder;
(8) And (3) sieving the mixed powder by using a vibrating screen to obtain formula milk powder A with uniform particles, and filling nitrogen for packaging.
In formula A, the palmitic acid glyceride contains 12.5% by weight of Sn-2 palmitic acid glyceride, and is substantially free of a-lactalbumin, beta-casein, and bifidobacteria.
TABLE 3-1 formulation of comparative example
| Components | Dosage (kg) |
| Whole milk powder | 230 |
| Defatted milk powder | 100 |
| Lactose | 305 |
| Whey protein powder (purity 80 wt.%) | 50 |
| Desalted whey powder ( |
170 |
| OPO structural fat | 100 |
| High oleic sunflower oil | 40 |
| Corn oil | 30 |
| Soybean oil | 70 |
| Rapeseed oil | 60 |
| Galacto-oligosaccharide syrup (purity 57 wt.%) and | 45 |
| fructo-oligosaccharide (chicory source) | 10 |
| Soybean lecithin | 1.4 |
| Choline chloride | 0.9 |
| DHA | 6 |
| ARA | 6 |
| Compound nutrient | 13.4 |
TABLE 3-2 ingredients contained in the Complex Nutrients
Clinical test method and test results
The feeding effect of the formula of example 1 and the formula of the comparative example were compared in a random control design.
1. Grouping of subjects:
infants in need of inclusion were screened by recruiting screening questionnaires by pediatricians or trained researchers. Written informed consent was obtained from the mother prior to study entry.
1.1 inclusion criteria
And (3) full-term infants: the gestational week is more than or equal to 37 weeks;
birth weight: 2.5kg-4kg;
normal pregnancy, delivered baby (including cesarean section);
healthy, apgar score > 7 after birth for 5-10 minutes;
age: < 15 days.
1.2 exclusion criteria
Infants with any of the following characteristics were excluded:
congenital malformations or chromosomal disorders detected at birth and of clinical significance;
patients with disease requiring mechanical ventilation or medication within one week after birth (infant jaundice patients who do not include blue light therapy);
those who affect feeding or metabolism due to suspected or unknown metabolic factors or due to physical defects;
twins or multiple births.
1.3 Experimental groups
Infants of 0-6 months old and full-term are selected as study objects, the infants are fed with the infant formula milk powder, the feeding amount of the infant formula milk powder of 1-15 days old is more than or equal to 250ml/d, the infants with the dry starting prognosis milk powder feeding rate of more than 80% are randomly divided into a test group (fed with the formula milk powder of example 1) and a control group (fed with the formula milk powder of a comparative example). The number of people in each group is not less than 5.
2. Intervention study method
Baseline (postnatal day 15) surveys and sample collections were conducted on enrolled infants, followed by continuous feeding for 6 months, during which time the subject was followed by visits by the project investigator at 4, 6, 8, 16, and 24 weeks after the start of feeding. The immunization of the infants was investigated.
3. Results of clinical experiments
Infants in the breast-milk group, test group and control group were tested for SIgA levels in stool output at baseline (day 15 after birth), at 6 weeks, 16 weeks, and 24 weeks after feeding, and the results are shown in fig. 1, where "diamond-solid" indicates the breast-milk group, "■" indicates the test group, and "tangle-solidup" indicates the control group.
As can be seen from FIG. 1, the overall level and the time-dependent trend of SIgA in the feces of the infants in the test group are similar to those of the infants in the breast milk group, which indicates that the immune status of the test group and the infants in the breast milk group progresses similarly; however, there was a significant statistical difference in the time-dependent trend of SIgA in the feces of the test group compared to the time-dependent trend of SIgA of the control group (p < 0.001). The trend of SIgA changes more closely to breast-fed infants in the test group. Since it is generally known to those skilled in the art that breast-feeding is beneficial for improving the immune system of infants, and the intestinal SIgA is an important immune substance, it can be seen that the SIgA level in the intestinal tract of breast-fed infants reflects the well-being of the immune system of healthy infants. The intestinal SIgA level and the change trend of the infants in the test group and the breast milk group are similar, which shows that the milk powder fed in the test group is also beneficial to improving the immune system condition of the infants. Therefore, compared with the control group milk powder, the formula milk powder is more beneficial to improving the immune system of infants and preventing or treating the immune system diseases of infants.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Reference to the literature
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[2]Husby S,et al.European Society for Pediatric Gastroenterology,Hepatology,and Nutrition guidelines for the diagnosis of coeliac disease.J Pediatr Gastroenterol Nutr.
2012；54(1):136–60.
[3]Pabst O,Cerovic V,Hornef M.Secretory IgA in the Coordination of Establishment and Maintenance of the Microbiota.Trends Immunol.2016May；37(5):287-296.
[4]Crivelli C,Demarta A,Peduzzi R.Intestinal secretory immunoglobulin A(sIgA) response to Aeromonas exoproteins in patients with naturally acquired Aeromonas diarrhea.FEMS Immunol Med Microbiol.2001Feb；30(1):31-5。
Claims (25)
1. The use of a milk product in the preparation of a medicament for the prevention or treatment of immune or gastrointestinal disorders caused by abnormal elevation of SIgA levels in the infant's intestinal tract; wherein the immune diseases caused by abnormal increase of the infant intestinal SIgA level are selected from allergy and celiac disease, and the gastrointestinal diseases caused by abnormal increase of the infant intestinal SIgA level are selected from inflammatory bowel disease and gastrointestinal tract mucosal injury;
wherein the dairy product comprises: a protein-providing material, a fat-providing material and bifidobacteria; wherein,
the raw material for providing protein is selected from animal milk, milk powder, whey protein powder and beta-casein, and the raw material for providing protein at least contains alpha-lactalbumin and beta-casein;
the raw material for providing fat at least contains palmitic acid glyceride, and the palmitic acid glyceride contains 30% by weight or more of Sn-2 palmitic acid glyceride;
the Bifidobacterium is Bifidobacterium BB12 and Bifidobacterium HN019;
wherein, in the dairy product, its characterized in that:
the weight ratio of the alpha-lactalbumin to the beta-casein to the Sn-2 glyceryl palmitate is (1-10) to (1-10);
the viable count of the bifidobacteria is 10 according to the weight of beta-casein per gram 6 ～10 11 CFU；
Wherein the ratio of viable count of bifidobacterium BB12 to viable count of bifidobacterium HN019 is (1.
2. Use of a dairy product for the preparation of a food product for improving the intestinal SIgA level of an infant closer to that of a breast-fed infant;
wherein the dairy product comprises: a protein providing material, a fat providing material and bifidobacteria; wherein,
the raw material for providing protein is selected from animal milk, milk powder, whey protein powder and beta-casein, and the raw material for providing protein at least contains alpha-whey protein and beta-casein;
the raw material for providing fat at least contains palmitic acid glyceride, and the palmitic acid glyceride contains 30% by weight or more of Sn-2 palmitic acid glyceride;
the Bifidobacterium is Bifidobacterium BB12 and Bifidobacterium HN019;
wherein, in the dairy product, its characterized in that:
the weight ratio of the alpha-lactalbumin to the beta-casein to the Sn-2 glyceryl palmitate is (1-10) to (1-10);
the viable count of the bifidobacteria is 10 according to the weight of beta-casein per gram 6 ～10 11 CFU；
Wherein the ratio of viable count of bifidobacterium BB12 to viable count of bifidobacterium HN019 is (1.
3. The use according to claim 1, wherein the protein-providing material is 200 to 1600 parts by weight and the fat-providing material is 70 to 500 parts by weight.
4. Use according to claim 1 or 3, wherein in the dairy product, the fat-providing raw material is selected from OPO structural fat, vegetable fat and oil and animal fat and oil.
5. Use according to claim 4, wherein the vegetable oil is selected from sunflower oil, corn oil, rapeseed oil and soybean oil.
6. Use according to claim 1 or 3, wherein the milk product further comprises a carbohydrate providing raw material.
7. Use according to claim 6, wherein the carbohydrate-providing raw material is selected from lactose, sucrose, glucose, starch and dextrin.
8. Use according to claim 6, wherein the carbohydrate-providing raw material is 100 to 600 parts by weight.
9. The use according to claim 1, wherein the dairy product further comprises at least one selected from the group consisting of vitamins, minerals, dietary fiber, DHA, ARA, phospholipids and choline chloride.
10. Use according to claim 1, wherein the dairy product comprises:
the dairy product contains bifidobacterium BB12 and bifidobacterium HN019, wherein the viable count of the bifidobacterium BB12 is 10 per gram of beta-casein 6 ～10 11 The viable count of CFU and bifidobacterium HN019 is 10 in terms of per gram of beta-casein 6 ～10 11 CFU。
11. Use according to claim 10, wherein the milk product further comprises vitamins and/or minerals.
12. Use according to claim 11, wherein the vitamin is present in an amount of 1 to 500mg per hundred grams of dairy product.
13. Use according to claim 11, wherein 10-3000 mg mineral is present per hundred grams dairy product.
14. Use according to any one of claims 9 to 13, wherein the dairy product is characterized by one or more of the following (a) to (d):
(a) The animal milk and milk powder are respectively derived from at least one mammal selected from cow, sheep, horse, deer and camel;
(b) The lactalbumin powder is selected from desalted lactalbumin powder, undesalted lactalbumin powder and alpha-lactalbumin powder;
(c) The dietary fiber is selected from fructo-oligosaccharide and galacto-oligosaccharide;
(d) The phospholipid is soybean phospholipid.
15. The use according to claim 14, wherein in item (b), the weight of the desalted whey protein powder is 1 to 20 times of the weight of the undesalted whey protein powder.
16. The use according to claim 14, wherein in item (b), the weight of the undesalted whey protein powder is 0.5-40 times of the weight of the alpha-whey protein powder.
17. The use according to claim 14, wherein in item (c), the weight ratio of fructo-oligosaccharide to galacto-oligosaccharide is 1 (1-6).
18. Use according to any one of claims 10 to 13, wherein the milk product is prepared by a process comprising the steps of:
(1-1) mixing the raw materials except for bifidobacterium, DHA and ARA to obtain a mixture;
(2-1) homogenizing the mixture to obtain a homogeneous material;
(3) Sterilizing the homogeneous material to obtain a sterilized material;
(4) Drying the sterilized material to obtain powder;
(5) And dry-mixing the powder, the bifidobacteria, the DHA and the ARA to obtain the dairy product.
19. Use according to claim 18, wherein in the process of preparing a dairy product, one or more of the following 1) to 11) are characterized:
1) The method also comprises a step (1-2) between the steps (1-1) and (2-1): filtering the mixture to remove impurities, and using the obtained filtered material for homogenization treatment in the step (2-1);
2) In the step (2-1), the temperature of the homogenization treatment is 50 ℃ or higher;
3) In the step (2-1), the pressure of the homogenization treatment is 120bar or more;
4) A step (2-2) is further included between the steps (2-1) and (3): concentrating the homogenized material, and using the obtained concentrate for sterilization treatment in the step (3);
5) In the step (3), the temperature of the sterilization treatment is more than 80 ℃;
6) In the step (3), the time of sterilization treatment is 10-60 seconds;
7) In the step (4), before drying treatment, filtering and removing impurities from the sterilized materials;
8) In the step (4), the sterilized material is firstly introduced into a spray drying tower for primary drying, and then the material obtained by the primary drying is introduced into a fluidized bed for secondary drying to obtain powder;
9) In the step (5), the dry mixing temperature is 20-35 ℃;
10 In step (5), dry mixing is carried out by means of a fluidized bed;
11 The method further comprises step (6): the dairy product is screened.
20. Use according to claim 19, wherein in item 4), the dry matter content of the concentrate in step (2-2) is between 40% and 60% by weight.
21. The use according to claim 19, wherein, in the step (4), the temperature of the inlet air of the spray drying tower is 150-200 ℃.
22. The use according to claim 19, wherein in item 8), the temperature of the air discharge of the spray drying tower in step (4) is 80 ℃ to 120 ℃.
23. The use according to claim 19, wherein, in the step (4), the negative pressure of the spray drying tower is-10 to-2 mmWG in the 8).
24. The use according to claim 19, wherein, in item 8), the sterilizing material is introduced into the spray-drying tower by means of a high-pressure pump in step (4).
25. The use according to claim 24, wherein, in item 8), the pressure of the high-pressure pump in step (4) is 140 to 250bar.
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