Pure lactic acid is a colorless liquid, is a colorless to pale yellow liquid. Odorless, hygroscopic. The relative density of 1.2060 (25/4 ℃). Melting point 18 ℃. Boiling point 122 ℃ (2kPa). Refractive index nD (20 ℃) ??1.4392. With water, ethanol, glycerin, insoluble in chloroform, carbon disulfide and petroleum ether. Heating under normal pressure, concentrated to 50%, part of the anhydride into milk, thus products often contain 10% -15% of the milk anhydride.
2013年8月16日星期五
Lactic acid bacteria beverage beneficial to humans
Currently on the market there are many from the milk (milk), sugar, lactic acid (citric acid), malic acid, flavors and preservatives, such as processing preparation "milk yogurt" is just sour taste, but do not have kefir health effects, buy should be carefully identified. Calcium lactate beverage into active and inactive, the main difference is the lactic acid fermentation, the formation of product is then sterilized before the procedure. Non-active lactic acid bacteria beverage products are nutritious, the lactic acid bacteria during the fermentation of the lactose consumed, resulting in a number of metabolites, such as vitamins and enzymes, etc., these metabolites is also beneficial to the human body. The lactic acid bacteria potassium lactate are not only lactic acid fermentation process produces some useful human metabolites, it also contains a certain amount of lactic acid bacteria, which helps to balance the human intestinal microflora balance. However, China yogurt and lactic acid bacteria beverage products on the shelf life of the number of viable cells did not make the corresponding provisions related products viable quality standards to be further improved.
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