lactic acid

Definitions

  • WordNet 3.6
    • n lactic acid a clear odorless hygroscopic syrupy carboxylic acid found in sour milk and in many fruits
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Webster's Revised Unabridged Dictionary
    • 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 acidDL-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.
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Chambers's Twentieth Century Dictionary
    • Lactic acid an acid obtained from milk
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Etymology

Chambers's Twentieth Century Dictionary
L. lacteus, milky—lac, lactis, milk; Gr. gala, galaktos, milk.

Usage

In literature:

Likewise sweet milk becomes sour, with the formation of lactic acid.
"The Farm That Won't Wear Out" by Cyril G. Hopkins
This is due to the fact that lactose undergoes the lactic acid fermentation.
"A Practical Physiology" by Albert F. Blaisdell
The vital factor in preserving the material by this method is the lactic acid which develops in fermentation.
"Every Step in Canning" by Grace Viall Gray
It is made by mixing one pound of lactic acid with one pound of glycerine and eight pounds of water.
"Burroughs' Encyclopaedia of Astounding Facts and Useful Information, 1889" by Barkham Burroughs
They convert the sugar of the whey into lactic acid by a process of fermentation.
"The Healthy Life, Vol. V, Nos. 24-28" by Various
As the sarco-lactic acid liberated in the muscles is not oxygenated a condition of acidosis ensues.
"Manual of Surgery" by Alexis Thomson and Alexander Miles
The value of various assistants, tartar, oxalic acid, lactic acid, sulphuric acid, on the fixation of mordants.
"The Dyeing of Woollen Fabrics" by Franklin Beech
For example, in the souring of milk the milk sugar is changed by the lactic acid ferments into lactic acid.
"Human Foods and Their Nutritive Value" by Harry Snyder
The value of various assistants, tartar, oxalic acid, lactic acid, sulphuric acid, on the fixation of mordants.
"The Dyeing of Cotton Fabrics" by Franklin Beech
Of the lactic acid you buy, say, a pint, and use two tablespoonfuls to two quarts of water.
"Woman" by William J. Robinson
I: Total acids as lactic.
"A Study Of American Beers and Ales" by L.M. Tolman
Lactic acid, applied with one to ten or more parts of water is also of value in the sclerous and verrucous types.
"Essentials of Diseases of the Skin" by Henry Weightman Stelwagon
Cherry red colour = lactic acid.
"The Elements of Bacteriological Technique" by John William Henry Eyre
In this fermentation, the acidity begins to be evident to the taste when it reaches about 0.3 per cent., calculated as lactic acid.
"Outlines of Dairy Bacteriology, 8th edition" by H. L. Russell
LACTIC ACID is common to all the solids and fluids of the system.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
The action of kephir in preventing intestinal putrefaction depends on the lactic acid bacillus which it contains.
"The Bacillus of Long Life" by Loudon Douglas
Lactic acid ferment, 190.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
In addition, silver salts are used in various strengths; also lactic acid in various strengths.
"Nurses' Papers on Tuberculosis :" by Various
Lactic acid also, in from ten to twenty-five parts of water, has yielded no better results in my hands.
"A System of Practical Medicine by American Authors, Vol. I" by Various
Lactic acid may substitute boric, in which case about 2 per cent.
"Animal Proteins" by Hugh Garner Bennett
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In news:

Malic acid is the tartness that is tamed in most red wines by conversion to the softer lactic acid .
New catalysts promise efficient production from lactic acid.
Lactose, Lactic acid, Lactase , or the Lac(k) Thereof (and why wine is still okay).
If you want to annoy a physiologist, say something along the lines of "Boy, I can really feel the lactic acid in my legs from yesterday's workout".
Pickling the old-fashioned way – lactic acid fermentation of vegetables.
Lactic Acid Is Not Muscles' Foe, It's Fuel.
Everyone who has even thought about exercising has heard the warnings about lactic acid.
The next time your client complains that lactic -acid buildup is keeping her from doing her best, take it with a grain of salt.
Lactose, Lactic acid, Lactase, or the Lac(k) Thereof (and why wine is still okay).
Everyone who has even thought about exercising has heard the warnings about lactic acid .
The next time your client complains that lactic-acid buildup is keeping her from doing her best, take it with a grain of salt.
The study found that lactic-acid accumulation, commonly thought to contribute to muscle fatigue, actually helps restore force to weakened muscles.
Before I venture into the big biofuel news from last week, here's an interesting announcement from Dutch lactic acid producer Purac.
The fabric's ability to compress helps increase blood flow, which flushes out lactic acid and gets more oxygen and nutrients back to muscles.
FAIRBANKS — With little fanfare and lots of lactic acid, Matias Saari and Owen Hanley, Jr hammered out a pair of impressive Nordic endurance feats last weekend that will be tough to beat.
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In science:

Hauge, B.K. Siesjo, Enhancement of iron-catalyzed free radical formation by acidosis in brain homogenates: differences in effect by lactic acid and CO2, J.
Effects of pyruvate administration on infarct volume and neurological deficits following permanent focal cerebral ischemia in rats
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