Propionic Acid


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propionic acid

[¦prō·pē¦än·ik ′as·əd]
(organic chemistry)
CH3CH2COOH Water- and alcohol-soluble, clear, colorless liquid with pungent aroma; boils at 140.7°C; used to manufacture various propionates, in nickel-electroplating solutions, for perfume esters and artificial flavors, for pharmaceuticals, and as a cellulosics solvent. Also known as methylacetic acid; propanoic acid.

Propionic Acid

 

CH3CH2COOH, a monocarboxylic acid of the aliphatic series. It is a colorless liquid with a pungent odor and has a melting point of — 20.8°C, a boiling point of 140.8°C, and a density of 0.993 g/cm3 (20°C). It is soluble in water, alcohol, and ether.

Propionic acid is formed during the fermentation of carbohydrates by propionic acid bacteria and certain other bacteria. In industry it is obtained chiefly through the oxidation of paraffin hydrocarbons as a by-product in the preparation of acetic acid. Propionic acid and its salts (Na, K, and others) are used as fungicides. Propionic anhydride is used in the manufacture of cellulose esters, and geranyl propionate and various other esters are used in perfume bases.

References in periodicals archive ?
Although the process of butyric acid degradation can also be divided into three phases, it differed from that of propionic acid degradation.
Effects of applying molasses, lactic acid bacteria and propionic acid on fermentation quality, aerobic stability and in vitro gas production of total mixed ration silage prepared with oat-common vetch intercrop on the Tibetan Plateau.
Moreover, as compared to formic and propionic acids, it gives better quality fractionated product with lower % residual lignin (PRL) than that of formic acid.
Lacroix, "Screening of a natural biodiversity of lactic and propionic acid bacteria for folate and vitamin B12 production in supplemented whey permeate," International Dairy Journal, vol.
The average concentration of propionic acid in sugar cane silage, elephant grass and corn silage increased as the glycerin concentration increased.
These can include acetic, lactic, formic, butyric and propionic acid. Other organic acids, excepting acetic acid, are of little consequence to wine flavor and aroma.
The formaldehyde-propionic acid blend was a commercial liquid product (Salmex[R], trade mark of Btech Tecnologias Agropecuarias e Comercio Ltda) composed by 33% formaldehyde, 9% propionic acid, terpenes and surfactants, and was applied using liquid aspersion equipment to guarantee dosage and homogeneity of the production the feed.
We can conclude that the obtained experimental data evidence about the favorable effect of antioxidant and sorbent co-feeding in the forage on the intensity of biosynthetic and fermentation processes, as well as propionic acid fermentation in rumen contents of experimental bull-calves.
For results at home, dermatologist Dr Stefanie Williams recommends ellagic acid and/or hydroxy-phenoxy propionic acid. SkinCeuticals' cream is pricey but contains both of these and has exciting clinical results - but always layer with SPF50.
Monteiro says that some studies suggest that metabolites released by these bacteria, such as hydrogen sulphide and propionic acid, not only irritate the gut but may also indirectly affect the brain at a young age.