Results 201 to 210 of about 17,721 (249)

Determination of volatile phenols in virgin olive oils and their sensory significance

Journal of Chromatography A, 2008
Volatile phenols are strong odorants produced by microbial activity and reported in several foods, but very scarce information is available on their presence in virgin olive oils (VOOs) and on their relation with VOO chemical and sensory quality. In the present paper, a factorial experimental design was applied for the development of a suitable solid ...
Stefania Vichi, A Romero, Susana Buxaderas   +2 more
exaly   +3 more sources

Volatile Phenols in Serum of Uraemic Patients

Clinical Science, 1972
1. The volatile phenols in sera of uraemic patients were analysed by gas-liquid chromatography. The concentrations of p-cresol, 1·17 ± 0·58 (mean ± SD), and phenol, 0·44 ± 0·39 mg/100 ml, were higher than the corresponding values (0·23 ± 0·17 and 0·02 ± 0·03 mg/100ml, respectively) in control subjects.
B, Wengle, K, Hellström
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Urinary Volatile Phenols in Patients with Intestinal Obstruction

Scandinavian Journal of Gastroenterology, 1971
To elucidate the origin of urinary volatile phenols in the gastrointestinal tract, their excretion was determined in 16 patients with intestinal obstruction. The normal level of excretion for these compounds (19–88 mg) was established by their determination in 23 control persons.
A, Tamm, K, Villako
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HPLC determination of volatile phenols in wines

Chromatographia, 1993
An alternative to the traditional solvent extraction method used to extract and rapidly quantify ethyl-and vinylphenol and ethyl-and vinylgaiacol from wine is presented. The method is based on retention of volatile phenols on adsorbants. Among the tested resins, the most efficient, AG 2-X8 (anion exchange resin), worked as well with a synthetic ...
Siegrist, J., Salles, Christian, Etiévant, P.X.   +2 more
openaire   +2 more sources

Ability of Lactic Acid Bacteria to Produce Volatile Phenols

American Journal of Enology and Viticulture, 2006
Thirty-five strains of lactic acid bacteria (20 species) were screened for the ability to produce volatile phenols from the corresponding phenolic acids, p-coumaric and ferulic, in culture medium. The concentration of vinylphenols and ethylphenols in the growth medium was analyzed by gas chromatography. Results showed that 13 strains (37%) were able to
Couto, José A., Campos, Francisco M., Figueiredo, Ana R., Hogg, Tim A.   +3 more
openaire   +3 more sources

Volatile phenol determination in wine

Journal of Agricultural and Food Chemistry, 1981
International ...
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Production of volatile phenols by Lactobacillus plantarum in wine conditions

Biotechnology Letters, 2013
Some lactic acid bacteria produce volatile phenols in culture medium but this activity has not been extensively studied in wine conditions. Red and white wines were mixed with MRS medium at different ratios to study the influence of wine on the metabolism of p-coumaric and ferulic acids by Lactobacillus plantarum.
Fras, Pauline, Campos, Francisco, Hogg, Tim, Couto, José António   +3 more
openaire   +4 more sources

A Gas Chromatographic Technique for the Analysis of Volatile Phenols in Serum

Scandinavian Journal of Clinical and Laboratory Investigation, 1971
AbstractThe method used for the determination of phenol, o-, m- and p-cresol is based upon purification by means of distillation, chloroform extraction of distillates, and gas chromatographic analysis of the trimethylsilyl ethers prepared. Serum samples from 15 normal subjects contained p-cresol (most probably sulphate-conjugated) at a mean ...
B, Wengle, K, Hellström
openaire   +2 more sources