There are three kinds of lactic acid isomers

Lactic acid has three isomers: Calcium lactate  D-type and L-type. L-lactic acid is lactic acid which In one kind. Lactic acid: the end product of anaerobic glycolysis. By the action of lactate dehydrogenase acetone Reduction of lactic acid generated pure 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, glycerol miscible Insoluble in chloroform, carbon zinc lactate and petroleum ether. Heating under normal pressure, concentrated to 50%, Some of the anhydride into milk, so the product often contains 10% -15% of lactic anhydride, lactic acid as Example, lactic acid molecule has an asymmetric carbon atom, namely the chiral carbon atom, an optically active. Called L of L-lactic acid, dextro-called D-lactic acid, referred to as racemic D, L-Lactic acid. Which is a racemic mixture of two enantiomers.