The way demineralization of cow's milk

 

(57) Abstract:

Usage: in the dairy industry, in particular when demineralization of cow's milk. The inventive milk first comes in contact with the anion exchange resin in the bicarbonate form within 5 to 15 minutes at volume ratio of anion exchange resin-milk 1 : 100 - 1 : 10, and then with a strongly acidic cation exchanger in the form for 5 to 30 min at a volume ratio of the cation-milk 1 : 200 - 1 : 25. table 4.

The invention relates to the dairy industry, in particular the production of demineralized bovine milk, in its mineral composition approaching that of female milk.

There is a method to change the composition of cow's milk in order to remove ions of alkaline and alkaline-earth metals from milk and whey with a pH of more than 5 (1), linking their synthetic aluminosilicates with high binding capacity (more than 50 mg CA/d), for example, zeolite 4A. After that, the aluminosilicate with sorbed thereon ions are removed, and the product is subjected to ultrafiltration or ion exchange. However, one-time use of zeolite and the need for further processing of milk by ultrafiltration or ion exchange reduces the value of this method.) - Rev. the eye is passed through the cation exchange resin amberlite JR 120 In strongly acidic form. There is a replacement of sodium by potassium or other cations. Proposed modes of ion exchange helped to reduce raw milk sodium 65 mg/l at constant concentrations of calcium and magnesium.

However, only decrease the sodium content in cow's milk while maintaining the concentrations of other macro - and micronutrients not solved the problems of approaching it in mineral composition to breast milk.

A method of obtaining skim milk with a lower content of phosphorus and calcium (3). Skim milk acidified with citric or hydrochloric acid to a pH of 5.4 to 5.6 and passed through an anion exchange resin in hydroxide form. The pH of skim milk rises to 11.5, then decreases to 8.5. Neutralize the milk to pH=7 by addition of citric acid. Obtained milk contains (mg/l):phosphate 1200; nitrates 1500; calcium 570.

The degree of demineralization by cations is 20% but is entered in the system 1500 mg/l of citrate ions, which is a significant disadvantage of this method. In addition, increasing the pH of the milk to 11.5 reduces native protein quality of milk.

The closest in technical essence to tallennetta for the partial removal of calcium from cow's milk to get him on the physico-chemical parameters to breast milk. In this case, the original cow's milk is cooled to 8oC, acidified to 21oT and passed through a column of cation exchange resin-sulfopropyl KU-1 or polystyrene KU-2. Consumption of cation exchanger KU-1 2,22% KU-2 2,48% by weight of milk.

The disadvantage of this method is that the pH of milk is becoming critical, the milk becomes unstable. In addition, the content of other cations such as potassium, sodium, magnesium, and anions of phosphorus, chlorine in milk remains unchanged, demineralization of milk insignificant 9,2%

The aim of the proposed method is an approximation of cow's milk on mineral composition to breast milk. This objective is achieved in that in the method of demineralization cow's milk, involving contacting the milk with a cation exchange resin, milk previously subjected to contact with the anion exchange resin for 5 to 15 min at a volume ratio of anion exchange resin-milk 1 100 1 10, and the contacting milk cation exchange resin is carried out for 5 to 30 minutes at a volumetric ratio of the cation-milk 1 200 1 25, and the anion exchange resin used in the bicarbonate form, and the strongly acidic cation exchanger in the form.

The proposed method changes the mineral composition of cow's milk is consistent proposalsare may be different depending on the need.

How demineralization cow's milk is as follows.

Fresh whole or skimmed milk with a pH of 6.4 to 6.9 passed through a column of anion exchange resin AMH in bicarbonate form at a temperature of 6 of the 20oC. the contact Time is 5 to 15 minutes at a volumetric ratio of the anion-milk 1 100 1: 10, which corresponds to 10 to 100 ml of anion exchange resin in 1 liter of milk. The granule size of the anion are 0,61 2 mm and Then treated with anion exchange resin, the milk is passed through a column of cation exchange resin KU CHCs in the strong acid form at a temperature of 6 of the 20oC. a contact Time of 5 to 30 minutes at a volumetric ratio of the cation-milk 1 200 1 25, which is 5 to 40 ml of nationite on 1 l of milk. The granule size of the cation of 0.6 to 1.2 mm

Table 1 presents experimental data on the dependence of the degree of demineralization of cow's milk from the number of the anion and its forms when contact time is 10 minutes

As can be seen from table 1 the efficiency of the anion exchange resin in the bicarbonate form, compared with hydroxide according to the degree of demineralization is much higher. In addition, the milk is passed through the anion exchange resin in the bicarbonate form, has no odor, while the hydroxide form of the sorbent gives milk alkaline odor. From table 1 it is evident takie liters of milk. The optimal value of the degree of demineralization when loading of the sorbent 100 ml per 1 l of milk. The increase in load up to 120 ml slightly increases the degree of demineralization (2% and, therefore, to make the resin more than 100 ml per 1 l impractical.

In table. 2 presents the experimental data according to the degree of demineralization of cow's milk from a quantity of cation exchange resin KU-2 x cs in strongly acidic form at a contact time of 15 minutes

As can be seen, the degree of demineralization of milk in the process of cation exchange depends on the amount of sorbent. The minimum value of the degree of demineralization is achieved by loading the cation exchanger 5 ml per 1 l of milk. The optimal value of

30 ml per 1 l of milk. The maximum value of 40 ml per 1 liter of milk, which corresponds to the ratio of the cation-milk 1 25. The increase in the loading of the cation of more than 30 ml leads to a deterioration in the quality of milk pH approaching eroticheskoe, milk becomes unstable, this effect increases sharply at the loading of the cation over 40 ml. Reduced load less than 5 ml per 1 l of milk leads to inefficient degree of demineralization. The cation exchanger is taken in the N+form, so as soon as the strongly acidic cation exchange resin can remove the above-mentioned cations of milk.

In table. 3 presents the dependence of the degree of demineralization of whole cow's milk by anion AMH in bicarbonate form on the duration of contact with a ratio of anion exchange resin-milk 1 10.

As can be seen, the optimal duration of contact is 10 minutes shorter contact time less than 5 min leads to inefficient degree of demineralization phosphorus. Increase contact time is more than 10 minutes is impractical because it only marginally increases the degree of demineralization (1-2%).

Changing the duration of contact of the cation with milk affect the quality of the milk composition, the degree of demineralization at the same changes.

In table. 4 shows the influence of the duration of contact of the sorbent KUNG CHCs in (H+) form when the ratio of the cation-milk 1 33 on the qualitative composition of milk and the degree of demineralization.

As can be seen, with increasing duration of contact up to 30 minutes, reduced the number of all cations in milk after sorption compared to the original. The increase in contact over 15 min slightly increases the degree of demineralization of milk. The duration of exposure less than 10 minutes does not bring the desired results is posledovatelnosti: first anion exchange resin, then cation exchange resin, because when aminirovanie increased pH values of milk /table. 1/ that allows you to spend cation exchange with greater loading of the cation, in order to increase the degree of demineralization.

It was established experimentally that the use of sorbents to handle cow's milk as raw material in the production of baby milk products will allow you to adjust the mineral content of children's products to reduce the chloride content of 30 to 50% phosphorus 8 33% potassium 40 50% sodium 40 50% calcium 10 30% magnesium 10 to 40%, so close to their mineral composition to the mineral composition of breast milk.

Thus the inventive method allows targeted to correct raw materials no mineral composition for the production of children's dairy products. The method is simple in implementation, tech. TTT TTT

The way demineralization of cow's milk, involving contacting the milk with a cation exchange resin, characterized in that the milk is pre-exposed to contact with the anion exchange resin for 5 to 15 min at a volume ratio of anion exchange resin milk 1:100 1:10, and contacting the milk with a cation exchange resin is carried out for 5 to 30 minutes at a volume ratio of the cation milk 1

 

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