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14日星期三
Fermentation of the same type of fermentation and shaped fermentation
Fermentation of sugar is the main way of lactic acid bacteria, adjust the pH value of about 5, for about 50 or 60dm; C Fermentation three to five days to give the crude acid.
Fermentation of raw materials is generally corn, rice, sweet potatoes and other starch material (also alfalfa, cellulose and other raw materials, research has raised kitchen garbage and recycling fish waste production of lactic acid). Lactic acid buffered lactic acid production stage to many, but not acid-producing higher-quality and more, mainly Rhizopus and other Ethyl lactate strains. The fermentation of different strains of different ways, can be divided into the same type of fermentation and shaped fermentation, the actual presence of microorganisms as other physiological activities, may not be simply a certain kind of fermentation pathway.
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