Results 251 to 260 of about 55,215 (298)

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
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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
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Volatile phenol determination in wine

Journal of Agricultural and Food Chemistry, 1981
International ...
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Further volatile phenols of latakia tobacco leaf

Phytochemistry, 1969
Abstract The phenolic extract of Latakia tobacco was analysed by conversion of the phenols to their corresponding acetates and separation of the components by capillary gas chromatography. Thirty-eight phenols have been identified by comparison with authentic compounds on three stationary phases.
W.J. Irvine, M.J. Saxby
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Phenolic composition of monovarietal red wines regarding volatile phenols and its precursors

European Food Research and Technology, 2018
The aim of this study was to characterise and compare wines from different grape varieties focusing on the volatile phenols and on the respective precursor compounds, both on the free form (p-coumaric, ferulic and caffeic acids) and as tartaric esters of hydroxycinnamic acids (caftaric, coutaric and fertaric acids).
Lima, Adriana, Oliveira, Carla, Santos, Cristina, Campos, Francisco M., Couto, José António   +4 more
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Sorption of wine volatile phenols by yeast lees

Food Chemistry, 2005
The capacity of Saccharomyces cerevisiae yeast lees to sorb 4-ethylguaiacol and 4-ethylphenol was investigated in a synthetic medium and in wine. Active dried yeast was more effective when volatile phenols were diluted in red wine. Partition coefficients between wine model solution and wine yeast lees were determined and compared with those measured ...
David Chassagne, Michèle Guilloux-Benatier, Hervé Alexandre, Andrée Voilley   +3 more
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Determination of volatile phenols in fino sherry wines

Analytica Chimica Acta, 2002
An easy, fast and reliable analytical method is proposed to determine the concentration of volatile phenols (ethyl- and vinylphenols) in fino sherry wines. The technique employed is a single stage sample treatment by solid-phase extraction (SPE) following a simple, fast procedure that enables 12 samples to be extracted simultaneously and requires a ...
Cristina Domı́nguez, Dominico A. Guillén, Carmelo G. Barroso   +2 more
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Fecal steroids and urinary volatile phenols in four Scandinavian populations

Nutrition and Cancer, 1982
Population samples from 4 study areas showing a 3-fold variation in large bowel cancer incidence were investigated for fecal bile acid loss and concentration, fecal neutral steroid loss and concentration, and urinary loss of volatile phenols. Each sample consisted of 30 randomly selected men, aged 50-59 years.
M J, Hill, A J, Taylor, M H, Thompson, R, Wait   +3 more
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Identification and determination of volatiles derived from phenol-formaldehyde materials

Talanta, 1988
Volatile substances derived from moulding compounds, resins and fillers used in the formulation of phenol-formaldehyde materials have been identified, isolated and determined. The amounts of the volatiles are related to the type of resins, fillers, curing agents and degree of cure used in the formulation.
R, Grzeskowiak, G D, Jones, A, Pidduck
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