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CN-122004292-A - Zero-carbohydrate milk product and preparation method thereof

CN122004292ACN 122004292 ACN122004292 ACN 122004292ACN-122004292-A

Abstract

The invention discloses a preparation method of a zero-carbohydrate milk product, which comprises the following steps of S1, degreasing raw milk after being subjected to milk cleaning treatment, separating to obtain cream and skimmed milk, S2, sending the skimmed milk into membrane separation equipment through a pump, carrying out circulating treatment for 10-60min to obtain concentrated solution, S3, adding 60-70 ℃ eluent into the concentrated solution in the step S3, continuously circulating for 20-40min, S4, sampling and detecting lactose and total carbohydrate content in the concentrated solution, backfilling the cream, carrying out homogenizing treatment, S5, carrying out pasteurization on the homogenized material at 60-70 ℃ for 20-40min, and carrying out hot filling to obtain the zero-carbohydrate milk product. The preparation method of the zero-carbohydrate milk product provided by the invention can thoroughly strip lactose and various oligosaccharides in the skim milk, and the carbohydrate of the final product is less than or equal to 0.5g/100g, so that the zero-carbohydrate standard is truly achieved, the strict requirements of ketogenic diet, diabetics and sugar-control people are completely met, and the blood sugar fluctuation and metabolism burden caused by sugar intake are radically avoided.

Inventors

  • MA CHANGHONG
  • LI CHAOXU
  • CHEN ZHI
  • ZHANG TIANBO
  • LING SEN

Assignees

  • 安徽天凯生物科技有限公司

Dates

Publication Date
20260512
Application Date
20260211

Claims (10)

  1. 1. A method for preparing a zero carbohydrate dairy product, comprising the steps of: S1, degreasing raw milk after purifying the raw milk, and separating to obtain cream and skimmed milk; S2, delivering the skimmed milk into membrane separation equipment through a pump, and performing cyclic treatment for 10-60min to obtain concentrated solution, wherein the aperture of a membrane element of the membrane separation equipment is 400-2000 daltons, and the flow passage is 0.2-0.6mil; s3, adding the eluent with the temperature of 60-70 ℃ into the concentrated solution in the step S3, and continuously circulating for 20-40min; S4, sampling and detecting lactose and total carbohydrate content in the concentrated solution, and backfilling the separated cream in the step S1 after confirming that the carbohydrate content is less than or equal to 0.5g/100g, and carrying out homogenization treatment; s5, performing pasteurization on the homogenized material at 60-70 ℃ for 20-40min, and performing hot filling after detecting that the microbial indicators of the material are qualified to obtain the zero-carbohydrate milk product.
  2. 2. The method of preparing a zero carbohydrate milk product according to claim 1, wherein in step S1, the raw milk is selected from one or more of cow 'S milk, sheep' S milk, camel milk.
  3. 3. A method of preparing a zero carbohydrate milk product according to claim 2, wherein in step S1, the milk-purifying treatment is performed by centrifugation or filtration.
  4. 4. The method of claim 1, wherein in step S2, the membrane separation device is composed of a pump, a membrane tube, a wash tank, a concentrate return tube, a filtrate return tube, a pressure gauge, a flowmeter, and a membrane element, wherein the membrane element is a ceramic membrane or a polyethersulfone membrane.
  5. 5. The method for producing a zero carbohydrate milk product according to claim 1, wherein in step S2, the skim milk is circulated for 10 to 60 minutes with a pressure of 0.3 to 0.8MPa and a flow rate of 5 to 15m3/h in the membrane separation device, and by-products are separated.
  6. 6. The method of claim 5, wherein in step S2, the separated by-products are concentrated and dried to prepare functional feed or food additive.
  7. 7. The method of claim 1, wherein in step S3, the volume ratio of the eluent to the concentrated liquid is 2:1-4:1.
  8. 8. The method according to claim 7, wherein in the step S3, the eluent is hot water or mineral conditioning liquid, and the mineral conditioning liquid comprises permeate obtained by separating byproducts separated in the step S2 through a nanofiltration membrane.
  9. 9. The method for preparing a zero carbohydrate dairy product according to claim 1, wherein in step S4, the homogenization treatment is performed at a temperature of 45-55 ℃ and the number of homogenization is 1-2.
  10. 10. A zero carbohydrate milk product produced by the method of any one of claims 1 to 9, characterized in that the milk product has a dry matter content of 10-18g/100g, a fat content of 0.01-9g/100g, a carbohydrate content of 0.5g/100g or less, a protein content of 5.5g/100g or more, a calcium content of 220mg/100g or more, a lactoferrin content of 18mg/100g, an immunoglobulin content of 30mg/100g or more, and a lactoperoxidase content of 180IU/100g or more.

Description

Zero-carbohydrate milk product and preparation method thereof Technical Field The invention relates to the technical field of dairy product processing, in particular to a zero-carbohydrate dairy product and a preparation method thereof. Background Milk products are important sources of high-quality proteins, calcium and various bioactive substances (such as lactoferrin and immunoglobulin), occupy important positions in daily diet and are favored by people of all ages. However, lactose naturally contained in conventional milk products is a main carbohydrate source, and the lactose content in 100g of common milk is about 4.5-5.0g, so that the characteristics make it difficult to meet the dietary requirements of specific people, namely, for ketogenic diets, low-carbon water diets lovers and fitness and sugar control people, lactose intake can influence the stable blood sugar and achieve metabolic targets, for about 70% of lactose intolerant people worldwide, lactose cannot be completely digested and absorbed, digestive tract discomfort such as abdominal distention and diarrhea is easily caused, and for chronic disease people such as diabetics, glucose produced by lactose metabolism can directly cause blood sugar fluctuation, and the disease control difficulty is increased. To solve the above problems, various solutions for reducing lactose content of milk products have been developed in the prior art. The most commonly used method is to add lactase to carry out enzymolysis on lactose, but the method can only decompose lactose into glucose and galactose, can not realize the aim of zero water, and still can cause burden on people with sugar control, and part of the scheme adopts a membrane filtration technology to separate lactose, such as a multistage filtration method disclosed in patent publication No. CN116998555A and adopting a 10-20KD and 800-1000D molecular weight cut-off filter membrane, although lactose can be separated, the design pertinence of the pore diameter of the filter membrane is insufficient, the absorption loss or incomplete separation of active protein in the milk is easy to cause, and the multi-step filtration and the subsequent independent sterilization process are needed, so that the process is complex and the flavor of the product is possibly destroyed. In addition, some processes reduce lactose content by means of dilution, desugaring, concentration and the like, but the unbalanced proportion of core nutritional ingredients such as protein, calcium and the like in the dairy product can be caused, or active substances such as lactoferrin, lactoperoxidase and the like are inactivated due to high-temperature treatment, so that the nutritional value and drinking experience of the product are seriously affected. Therefore, there is a need to develop a preparation technology capable of effectively removing carbohydrates and retaining the original quality of milk products. Disclosure of Invention The invention aims to provide a preparation method of a milk product with zero carbohydrate, lactose and various oligosaccharides in skim milk can be thoroughly stripped by the design of membrane separation equipment and the hot water circulation elution process at 60-70 ℃, and the carbohydrate of a final product is less than or equal to 0.5g/100g, so that the 'zero carbohydrate' standard is truly achieved, the strict requirements of ketogenic diet, diabetics and sugar control groups are completely met, and the blood sugar fluctuation and metabolic burden caused by sugar intake are radically avoided. In order to solve the technical problems, the invention provides the following technical scheme: The first aspect of the invention provides a method for preparing a zero carbohydrate dairy product, comprising the steps of: S1, degreasing raw milk after purifying the raw milk, and separating to obtain cream and skimmed milk; S2, delivering the skimmed milk into membrane separation equipment through a pump, and performing cyclic treatment for 10-60min to obtain concentrated solution, wherein the aperture of a membrane element of the membrane separation equipment is 400-2000 daltons, and the flow passage is 0.2-0.6mil; S3, adding an eluent at 60-70 ℃ into the concentrated solution in the step S3, and continuously circulating for 20-40min; S4, sampling and detecting lactose and total carbohydrate content in the concentrated solution, and backfilling the separated cream in the step S1 after confirming that the carbohydrate content is less than or equal to 0.5g/100g, and carrying out homogenization treatment; s5, performing pasteurization on the homogenized material at 60-70 ℃ for 20-40min, and performing hot filling after detecting that the microbial indicators of the material are qualified to obtain the zero-carbohydrate milk product. Preferably, in step S1, the raw milk may be any mammalian milk including, but not limited to, one or more of cow 'S milk, sheep' S milk, camel milk. Preferably, in step S1, the