Low-lactose milk powder and preparation method thereof

Abstract

The title of the invention is low-lactose milk powder and a preparation method thereof. The invention discloses low-lactose milk powder, which contains (by weight): 22-25% of fat, 20-23% of protein and 5.5% and below of lactose. The invention discloses a preparation method of the low-lactose milk powder, comprising the following steps: (1) acceptance inspection of raw milk; (2) separation for milk purification; (3) pre-sterilization; (4) primary burdening; (5) secondary burdening; (6) homogenizing and pre-sterilization; (7) lactase enzymolysis; (8) enzyme deactivation treatment; (9) milk heating-up and preheat sterilization; (10) evaporation and concentration; (11) high pressure atomizing; (12) drying and fluidized bed redrying; (13) powder discharge and powder screening; and (14) packaging. By controlling physical and chemical indexes of a material before hydrolysis and by the utilization of a high-temperature lactose enzyme hydrolysis technology, the low-lactose milk powder is produced, and lactose hydrolysis rate reaches 80% and above.

Description

technical field [0001] The invention relates to the technical field of dairy product production and processing, in particular to a processing method for making low-lactose milk powder with cow's milk as the main raw material. Background technique [0002] Milk is the most perfect food that humans can obtain from nature so far. Milk is rich in minerals, such as calcium, phosphorus, iron, zinc, etc. The most rare thing is that milk is the best source of calcium for the human body. And the ratio of calcium and phosphorus is appropriate, which is conducive to the absorption of calcium. Lactose is a disaccharide composed of two monosaccharide molecules. The average content of lactose in fresh milk is 4.8%. After lactose enters the gastrointestinal tract, it cannot be directly absorbed. It needs lactase to decompose it into monosaccharides before it can be absorbed by the human body. use. People produce enough lactase during breastfeeding, but many people gradually reduce the pr...

AI Technical Summary

Problems solved by technology

[0004] The prior art discloses several low-lactose milk powder processes, such as a jujube-type low-lactose milk powder and its preparation method (Chinese patent authorization announcement number CN102429030B). The lactose hydrolysis process in this patent uses a low-temperature hydrolysis lactose process (the hydrolysis temperature is preferably 6°C ), resulting in long hydrolysis time (15-18h hydrolysis time), which is not conducive to the turnover of production equipment

Such as the preparation method of sugar-free milk powder (Chinese patent authorization announcement number CN101426375B), this patent uses methods such as enzyme curd separation, emulsion dissolving agent redissolution, whey liquid membrane separation, etc. to remove lactose in milk. The method is complicated and requires new equipment. support, increasing production costs

For example, a low-lactose milk powder and its preparation method (Chinese Patent Application Publication No. CN101779703A), the lactose hydrolysis process in this patent adopts the addition of lactase, the hydrolysis temperature is preferably 30-40°C, the hydrolysis time is 2-8h, and the more preferable temperature is 37°C. The hydrolysis time is 2.5 hours, at a temperature suitable for microbial reproduction, the hydrolysis time is too long, and the milk quality is at risk

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