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12月2日星期一
Natural pigment stability
More and more popular. However, Monascus red light stability is poor , the use of red yeast red colored meat products, especially low-temperature meat products, in storage or sales process, Zinc lactate and oxidation due to fade . Average low temperature meat in freezer for about a week selling color faded to gray, is the reason.
Factors affecting the stability of natural pigments are mainly acid, alkali , temperature , oxidizing agents,buffered lactic acid , metal ions, lighting and so on. General monomers having color care when used alone . In the low usage conditions, protect the color of meat is not obvious ; dosage is too high, will increase costs and may affect product flavor.
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