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28日星期三
Relatively stable emulsion formation
Emulsifiers are a large class of surfactants , may stabilize the emulsion . The reason is , emulsifying two substances can be dispersed in water physiognomy , or double -layer thin film is formed ,Sodium lactate the dispersed phase with each other to prevent condensation , the formed emulsion is stable . For example, in pesticide original drug ( solid ) or oil ( liquid ) in a certain amount of emulsifier , then they are dissolved in an organic solvent , the mixing can be made after a transparent liquid , called EC. The emulsifiers used are soaps , acacia , alkylbenzene sulfonate .
However, some emulsifiers can be used as food additives , primarily for immiscible oil ( hydrophobic material ) , and water ( hydrophilic substance) foods , so that the oil and water magnessium lactate reduce the surface tension , the two surfaces to form a protective film , so that the oils can be uniformly stable in water , so that stability of aqueous material in the oil evenly .
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