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30日星期五
Quantitative potassium lactate solution
Weigh accurately a quantity of solution of potassium lactate, potassium lactate equivalent to 500mg, placed in a suitable flask, add acetic anhydride: acetic acid = 1:5 mixed solution of 60ml, the mixture allowed to stand for 20min. With 0.1mol / L perchloric acid in glacial acetic acid solution by the potentiometric titration of its endpoint. While doing a blank test and make the appropriate corrections. Per Ml 0.1mol / L perchloric acid potassium lactate equivalent to 12.82mg. the flavoring agents; emulsifier; antioxidant synergist; moisture absorbent; pH adjusting agent; flavorant; buffer. Calcium lactate in jams, fruit jellies, marmalades, and ice cream. According to production needs appropriate use (FDA, 1994).as a moisturizer can be used as substitute for glycerol. Good moisture absorption, potassium lactate agents and skin or hair Emollient, mild effect on the skin, for skin care cream boxes, lotions, shampoos, conditioners. Breathable, moisture-Run effect, ductility and spreading good performance.
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