Sarcolactic acid
Lactic Lac"tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster]

{Lactic acid} (Physiol. Chem.), a sirupy, colorless fluid, soluble in water, with an intensely sour taste and strong acid reaction. There is one center of optical activity, and this results in the observation of three isomeric modifications all having the formula {C3H6O3}; one is dextrorotatory (L-lactic acid), the other levorotatory (D-lactic acid), and the third an optically inactive mixture of the first two (DL-lactic acid); chemically it is 2-hydroxypropanoic acid. {Sarcolactic acid} or {paralactic acid} occurs chiefly in dead muscle tissue, while {ordinary lactic acid} (DL-lactic acid) results from fermentation, such as the fermentation of milk by lactic acid bacteria. The two acids are alike in having the same constitution (expressed by the name {ethylidene lactic acid}), but the latter is optically inactive, while sarcolactic acid rotates the plane of polarization to the right. The third acid, ethylene lactic acid, accompanies sarcolactic acid in the juice of flesh, and is optically inactive.

{Lactic ferment}, an organized ferment ({Bacterium lacticum} or {Bacterium lactis}), which produces lactic fermentation, decomposing the sugar of milk into carbonic and lactic acids, the latter, of which renders the milk sour, and precipitates the casein, thus giving rise to the so-called spontaneous coagulation of milk.

{Lactic fermentation}. See under {Fermentation}. [1913 Webster +PJC]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • sarcolactic acid — |sarkə+... noun Etymology: sarcolactic from sarc + lactic : the dextrorotatory L form of lactic acid occurring in muscle …   Useful english dictionary

  • sarcolactic acid — sar·co·lac·tic acid .sär kə .lak tik n the dextrorotatory L form of lactic acid occurring in muscle …   Medical dictionary

  • Sarcolactic — Sar co*lac tic, a. [Sarco + lactic.] (Physiol. Chem.) Relating to muscle and milk; as, sarcolactic acid. See {Lactic acid}, under {Lactic}. [1913 Webster] …   The Collaborative International Dictionary of English

  • ethylidene lactic acid — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

  • Lactic acid — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

  • ordinary lactic acid — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

  • paralactic acid — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

  • sar|co|lac|tic acid — «SAHR koh LAK tihk», the dextrorotatory form of lactic acid found in the blood and muscles as a result of the metabolism of glucose: »Sarcolactic acid…has been called the “acid of fatigue”…because a greater amount of sarcolactic aid is present in …   Useful english dictionary

  • lactic acid — A normal intermediate in the fermentation (oxidation, metabolism) of sugar. In pure form, a syrupy, odorless, and colorless liquid obtained by the action of the l. bacillus on …   Medical dictionary

  • Bacterium lacticum — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

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