Sarcolactic acid

Fleisch-mehl, n. meat meal, tankage, -milch-s ure, /. sarcolactic acid, fleischrot, a. flesh-colored. 

Non-nitrogenous organic substances are present in small quantity, the principal ones being glycogen (up to 1-5%), inositol, sarcolactic acid, butyric acid, etc. 

Sarcolactic Acid.—When the solution surrounding the positive pole was kept neutral, a concentrated solution of the sodium salt yielded acetic aldehyde and carbon dioxide. 

Ethyleno-lactic Acid.—Muscular tissue contains a mixture of this and optically active ethylidene lactic acid, which has been known as sarcolactic acid. 

C3HJO3, Mr 90.08. The racemate and the enantiomers occur in nature. (/f)-Form, mp. 53 °C, [0] -2.6° (HjO), pK 3.83. Prismatic platelets, soluble in water, ethanol, and ether, insoluble in chloroform. (/ )-(-)-L. is formed in the fermentation of glucose by Lactobacillus leichmannii and L. delbrueckii with 1 - and 2-valent metal ions it forms dextrorotatory salts and laevorotatory salts with 3-valent metal ions, e.g., zinc D-(+)-lactate 2H2O, [alo" -i-8.18° (HjO). (5)-form (sarcolactic acid, paralactic acid), mp. 53 °C, [ajp l 3.82° (H2O), pKg 3.79 (25 °C), is highly hygroscopic, occurs in blo, muscles serum, bile, kidneys, and other organs. The content of L. increases after strenuous muscle activity (lactate acidosis). The racemate, oil.mp. 17°C,bp. 122 °C(1.86 kPa), steam distillable, is widely distributed in nature, e. g., in sour milk products, in molasses as a result of partial fermentation of the sugars from apples and other fruits. For biochemistry and preparation, see Ut.. ... 

W. Heintz and Wislicenus isolated a base (now known as oxytetraldin, CgHisNO) by gently heating aldehyde-ammonia, and showed that Liebig s supposed aldehydic acid (see p. 357) has no existence. Liebig obtained lactic acid from flesh-juice, in which it had been discovered by Berzelius (see p. 151), but both found that it differs in some respects from ordinary lactic acid. This was confirmed by H. Engelhardt and by Heintz. The acid from flesh was called sarcolactic acid Heintz called it paralactic acid. The calcium salts of the two acids crystallise with different amounts of water. Kolbe said the cause of the difference between the two acids was not yet ascertained. 

L. Dossios, at the suggestion of Wislicenus, oxidised sarcolactic acid, and since he thought he obtained malonic acid he formulated the two acids as ... 

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