RU2285420C1 - Method for conservation of milk - Google Patents

Abstract

FIELD: dairy industry.

SUBSTANCE: the present innovation deals with supplementing milk just before its pasterization with complex compound of silver - silver glycinate as a solution containing about 16.85-168.52 g preparation/l solution, at the ratio of 1 ml solution/1000 ml milk. The innovation enables to prolong terms of storage of ready-to-use product at simultaneous keeping conventional modes of pasteurization and increase biological value of the product.

EFFECT: higher efficiency of conservation.

3 ex, 3 tbl

Description

The invention relates to the dairy industry and may find its application for the preservation of milk.

In industrial conditions, the main technological operation that contributes to the destruction of microorganisms and the destruction of harmful products of their metabolism is pasteurization. However, heating milk negatively affects its constituent parts, in particular, whey proteins, enzymes, and some vitamins. Since milk and dairy products, according to WHO data, belong to category 1 products, which most often serve as a direct source of food poisoning, to ensure their proper quality and, accordingly, increase the shelf life, high- and ultra-high-temperature pasteurization regimes are used. This, in turn, leads to the complete denaturation of proteins, the destruction of more than 50% of vitamins, which leads to the need for their additional introduction in the calculated quantities.

A known method of preserving milk, which consists in the fact that preservatives are introduced into milk at the rate of g / t in the following ratio:

Sulfur Copper 90-100 Sodium chloride 10000-12000 Potassium iodide 2.0-3.3

(SU 1600666 A, A 23 C 3/08, dated 10.23.99).

The main disadvantage of this method is the use of preservatives in large quantities (above the MPC of Cu ²⁺ ) and, as a result, the complexity of operations.

A known method of preserving milk by introducing electrolytically obtained silver ions in concentrations of 5-6 mg / dm ³ (Zhvanko Yu.N., Pisarenko A.P., Cherepanova L.M. // Izv. Vuzov. Food Technology, 1962, No. 6 p. 52-54). The disadvantage of this method is that the concentration of silver ions is 100 times higher than the MPC (MPC Ag ⁺ is 0.05 mg / dm ³ ).

A known method of preserving milk by introducing Ag ⁺ ions, followed by sequential introduction of Cu ^{2+ ions} and hydrogen peroxide (RU 2193326 C2, A 23 C 3/08, from 11.27.2001). The disadvantage of this method is the use of inorganic salts of the above ions that do not have biological activity.

The closest analogue to the claimed method is a method of preserving milk by introducing into it a complex silver compound prepared on the basis of β-pyridinecarboxylic acid (vitamin PP, niacin), with a silver ion concentration of 0.05 mg / dm ³ (RU 2136165 C1, A 23 C 3/08, dated 09/10/99).

The disadvantage of this method is a slight increase in the cost of finished products due to the introduction of an additional amount of vitamin. The technical result of the claimed invention is to increase the shelf life of the finished product.

The claimed result is achieved due to the fact that silver glycinate (a complex salt of silver with α-aminoacetic acid (glycine - E 640) is added to milk immediately before pasteurization in the form of a solution containing 16.85-168.52 mg of the drug per liter of solution, in in a ratio of 1 ml of solution per 1000 ml of milk, short-term pasteurization is carried out at a temperature of 76 ± 1 ° C with a holding time of 20 s. The amount of the preparation is introduced into milk at the rate of 0.01 mg Ag ⁺ / l; 0.05 mg Ag ⁺ / l and 0 , 1 mg Ag ⁺ / L.

In accordance with the requirements of GOST 13264-88, when milk is received at a dairy plant, the acidity of milk should not exceed 18 ° T, the maximum acidity of milk is 21 ° T. In accordance with TU 9222-150-00419785-99, the storage time of pasteurized milk is 72 hours at a storage temperature of 4 ° C.

In order to establish the preserving effect of silver glycinate, the growth dynamics of the acidity of pasteurized milk was studied in the presence of the above drug (Table 1-3). The initial acidity of the milk was 16 ° T. The dynamics of acidity was studied for 5 days. This time was established on the basis of microbiological studies, which showed that, with longer storage, pathogenic microflora begins to develop while maintaining an increase in acidity.

Example 1

1 ml of silver glycinate solution containing 0.01685 mg of the drug, which is equivalent to 0.01 mg of Ag ⁺ / l, is added per 1000 ml of milk with a fat content of 2.5%, acidity of 16.5 ° T. The milk is pasteurized at a temperature of 76 ° C for 20 s, then quickly cooled to 4 ° C and then stored at this temperature.

Table 1 shows data on the shelf life of milk obtained by the closest analogue and according to the claimed method when making 0.01 mg of Ag ⁺ / L.

Table 1 Storage time, hour 24 48 72 96 144 Control sample, ° T 17.5 19.0 - - - Milk with silver glycinate solution, ° T 17.0 18.0 18.5 19.0 19.0

Example 2

1 ml of silver glycinate solution containing 0.08426 mg of the drug, which is equivalent to 0.05 mg of Ag ⁺ / dm ^{3, is} added per 1000 ml of milk with a fat content of 2.5%, acidity of 16.5 ° T. The milk is pasteurized at a temperature of 76 ° C for 20 s, then quickly cooled to 4 ° C and then stored at this temperature.

Table 2 shows data on the shelf life of milk obtained by the closest analogue and according to the claimed method when adding 0.05 mg of Ag ⁺ / L.

table 2 Storage time, hour 24 48 72 96 144 Control sample, ° T 17.5 17.5 - - - Milk with silver glycinate solution, ° T 16.5 16.5 16.5 17.0 17.0

Example 3

1 ml of silver glycinate solution containing 0.16852 mg of the drug, which is equivalent to 0.1 mg of Ag ⁺ / dm ^{3, is} added per 1000 ml of milk with a fat content of 2.5% acidity of 16.5 ° T. The milk is pasteurized at a temperature of 76 ° C for 20 s, then quickly cooled to 4 ° C and then stored at this temperature.

Table 3 shows the data on the shelf life of milk obtained by the closest analogue and according to the claimed method when adding 0.1 mg of Ag ⁺ / l.

Table 3 Storage time, hour 24 48 72 96 144 Control sample, ° T 17.5 17.5 - - - Milk with silver glycinate solution, ° T 16,0 16,0 16,0 16.5 16.5

Experimental results showed that the introduction of this drug provides an increase in the shelf life of the product up to five days compared with the closest analogue of the claimed method.

This preparation allows, without exceeding the maximum permissible silver concentrations established by the sanitary rules and regulations of the Sanitary Inspection Center, and temperature treatment conditions, to obtain a product with increased shelf life and improved consumer properties. In addition, the recommended technology allows you to increase the biological value of the product, which is associated with the introduction of a biologically active amino acid - glycine.

Claims (1)

A method of preserving milk, involving the introduction of a silver complex compound immediately before milk pasteurization, characterized in that silver glycinate is used as a complex compound in the form of a solution containing 16.85-168.52 g of the drug per 1 liter of solution, in a ratio of 1 ml of solution per 1000 ml of milk.