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25日星期日
Most of antimicrobial substances produced by lactic acid bacteria
Lactic acid bacteria produce antimicrobial substances are peptides or proteins, called bacteriocins. Calcium lactate be two types of bacteria secrete hormone, a class is only the inhibition of the related bacteria, antibacterial spectrum is narrow, can hinder contact with pathogenic microorganisms intestinal cells; another with broad-spectrum antimicrobial activity against pathogens such as they are: Salmonella, congratulations coli and Pseudomonas has good inhibition. Therefore, the long-term lactic acid in the diet can reduce the breeding animals add enteritis and other diseases.
Lactic acid bacteria, bacteria growth and metabolism farmed animals produce beneficial nutrients, such as buffered lactic acid, amino acids, vitamins, enzymes and antibacterial substances. In the feed additive, both antiseptic effect, increased feed flavor, promote aquaculture animal appetite.
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