BACKGROUND Dietary fibre is fermented by the colonic microbiota to carboxylic acids (CA), with potential health effects associated in particular with butyric and propionic acid. OBJECTIVE To investigate the formation of CA in the hindgut of healthy rats fed dietary fibre from different fractions of wheat shorts, a by-product of the milling of wheat. DESIGN Rats were fed dietary fibre (80 g/...

Preliminary investigations have shown that Clostridium acetobutylicum and related butyric-acid butyl-alcohol bacteria, fail to develop in a synthetic medium containing only ammonium sulphate, inorganic salts and glucose. These results suggest that perhaps the organisms require complex nitrogen compounds or some specific growth factor. Wood, Tatum and Peterson (1937), Wood, Andersen and Werkman ...

The literature concerning the nutrition of the propionic acid bacteria was reviewed by Thompson (1943). He attempted to determine which of the Propionibacterium species could be grown on synthetic media containing B vitamins and, if growth occurred, to show which vitamins were required. He was able to grow satisfactorily through repeated subculture five out of nine cultures. All five of these c...

BACKGROUND Propionic acid is a widely used preservative and has been mainly formed by artificial synthesis or fermentation. In the case of natural products, the presence of propionic acid is viewed as a sign that an additive has been introduced for antimicrobial effects. METHODS In this work, the propionic acid that occurs in Scutellaria baicalensis roots was studied. A quantification method ...

amino acid dehydrogenases (l-amino acid: oxidoreductase deaminating ec 1.4.1.x) are members of the wider superfamily of oxidoreductases that catalyze the reversible oxidative deamination of an amino acid to its keto acid and ammonia with the concomitant reduction of either nad+, nadp+ or fad. these enzymes have been received much attention as biocatalysts for use in biosensors or diagnostic kit...

Triggered by the strong antimicrobial activities of menthol and various fatty acids, eutectic mixtures based on components are developed, producing new solvents that have possibilities to become a antibiotic. This study aims provide an insight into deep (DESs) developed. Menthol-based DES combined with namely propionic acid, butanoic hexanoic octanoic decanoic levulinic were successfully obtain...

A continuous culture model of the proximal colon was used to study the effect of clindamycin on the ability of colonic bacteria to ferment carbohydrate. Six steady state anaerobic cultures of human faeces, in a medium simulating ileostomy effluent, were treated with 26 micrograms/ml clindamycin. They were paired with six untreated cultures, run under identical conditions. Clindamycin treatment ...

Biosynthetic pathways of ebelactone A and B were studied by 13C NMR spectroscopy. By using 13C labeled compounds as precursors it was determined that ebelactone A was derived from one molecule of acetic acid and six propionic acids and ebelactone B from one molecule of acetic acid, five propionic acids and one butyric acid.

1. The effects in the cow of intraruminal infusions of acetic acid, propionic acid or butyric acid on the secretion of the component fatty acids of the milk fat, and of these acids and of lactic acid on the composition of the blood plasma of the jugular vein, have been studied. 2. The infusion of acetic acid or butyric acid increased the yield of the C(4)-C(16) acids of milk fat but decreased t...