Definition of Lactec
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.
Lactic acid (Physiol. Chem.), a
sirupy, colorless fluid, soluble in water, with an intensely sour
taste and strong acid reaction. There are at least three isomeric
modifications all having the formula
C3H6O3. Sarcolactic or
paralactic acid occurs chiefly in dead muscle tissue, while
ordinary lactic acid results from fermentation. 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 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.
- Webster's Unabridged Dictionary (1913)
- Of, relating to, or derived from milk
- The Nuttall Encyclopedia
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