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9月9日星期一
Lactic acid bacteria fermentation is complete
When the temperature is too high and homogeneous (≥ 25 ℃) is made of multi-product precipitation, easy layering, poor taste.
Distribution, save the final product is made - live lactobacillus milk drinks, in the distribution, Lactic acid also need to pay attention when the effect of temperature, because there is no added additives, distribution, save when the temperature of the great influence on lactic acid powder of precipitation amount, the higher the temperature, the final The precipitate formed product more desirable distribution, storage temperature is 4 ℃, but in the actual case, be lower than 20 ℃ also very good.
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