The Experts below are selected from a list of 3762 Experts worldwide ranked by ideXlab platform
W. Van Hoven - One of the best experts on this subject based on the ideXlab platform.
-
Volatile fatty acid production in the hindgut of Procavia capensis
Comparative Biochemistry and Physiology Part A: Physiology, 2003Co-Authors: Anette K. Eloff, W. Van HovenAbstract:Abstract 1. 1. Two sites of fermentation have developed in the hindgut of hyrax. 2. 2. The sacculation has a larger digesta mass and volatile fatty acid production rate than the caeca. 3. 3. Mean Molar Percentage of acids amounted to 63.9% acetic acid, 22.9% propionic acid and 6.0% butyric acid for the sac and caeca. 4. 4. Total volatile fatty acid production per day did not differ significantly among seasons, and energy available from the volatile fatty acids averaged 69.9% of the basal metabolic requirements and 33.8% of the average daily metabolic requirements.
Anette K. Eloff - One of the best experts on this subject based on the ideXlab platform.
-
Volatile fatty acid production in the hindgut of Procavia capensis
Comparative Biochemistry and Physiology Part A: Physiology, 2003Co-Authors: Anette K. Eloff, W. Van HovenAbstract:Abstract 1. 1. Two sites of fermentation have developed in the hindgut of hyrax. 2. 2. The sacculation has a larger digesta mass and volatile fatty acid production rate than the caeca. 3. 3. Mean Molar Percentage of acids amounted to 63.9% acetic acid, 22.9% propionic acid and 6.0% butyric acid for the sac and caeca. 4. 4. Total volatile fatty acid production per day did not differ significantly among seasons, and energy available from the volatile fatty acids averaged 69.9% of the basal metabolic requirements and 33.8% of the average daily metabolic requirements.
Patricia S. Uriarte - One of the best experts on this subject based on the ideXlab platform.
-
Relationships between the evolution of the Percentage in weight of polar compounds and that of the Molar Percentage of acyl groups of edible oils submitted to frying temperature.
Food Chemistry, 2012Co-Authors: Maria Dolores Guillén, Patricia S. UriarteAbstract:Abstract The evolution of the Molar Percentage of several kinds of acyl groups of extra virgin olive, sunflower and virgin linseed oils was monitored throughout heating at frying temperature by means of 1 H nuclear magnetic resonance. Likewise, the evolution of the Percentage in weight of the polar compounds of the same oils under the same heating conditions was also determined. Relationships between both sets of parameters, in each oil and in the oils as a group, were studied. An equation which is able to accurately predict the Percentage in weight of the polar compounds, throughout the heating at frying temperature, of any one of these three oils, from the Molar Percentage of triunsaturated, diunsaturated and monounsaturated acyl groups, was obtained. In this way both Molar Percentage of acyl groups and Percentage in weight of polar compounds can be obtained in a few minutes that registration of the 1 H NMR spectrum of the oil takes, in addition to the rest of information provided by this technique. The study reveals the close relationships between Percentage in weight of polar compounds and the composition expressed in terms of Molar Percentages of acyl groups in edible oils heated at frying temperature.
-
Monitoring by 1H nuclear magnetic resonance of the changes in the composition of virgin linseed oil heated at frying temperature. Comparison with the evolution of other edible oils
Food Control, 2012Co-Authors: Maria Dolores Guillén, Patricia S. UriarteAbstract:Abstract Linseed oil was heated at frying temperature in an industrial fryer for 20 h. The evolution of its composition was monitored by 1H Nuclear magnetic resonance. The composition parameters determined simultaneously were: the Molar Percentage of the different acyl groups, the Iodine Value, the concentration of the total aldehydes as well as of the different kinds of aldehydes; in addition, the Percentage in weight of Polar Compounds was also determined at different heating times. When heating this oil the Molar Percentage of linolenic groups diminishes at an important rate while that of linoleic or diunsaturated groups increases, as does that of saturated plus modified groups, that of oleic or monounsaturated groups remaining unchanged. The main aldehydes formed were (E,E)-2,4-alkadienals together with n-alkanals and (E)-2-alkenals. This oil reached the safety limit of 25% in weight of Polar Compounds very early with a very small degradation level of acyl groups and a very low content of aldehydes. The changes undergone by this oil were compared with those of sunflower oil and of extra virgin olive oil submitted to the same degradative conditions.
Chaochuang Yin - One of the best experts on this subject based on the ideXlab platform.
-
nanocasting synthesis of chromium doped mesoporous ceo2 with enhanced visible light photocatalytic co2 reduction performance
Journal of Hazardous Materials, 2017Co-Authors: Yangang Wang, Xia Bai, Fei Wang, Shifei Kang, Chaochuang YinAbstract:Abstract Chromium doped mesoporous CeO2 catalysts were synthesized via a simple nanocasting route by using silica SBA-15 as the template and metal nitrates as precursors. The effect of Cr doping concentration (5%, 10%, 15% and 20% of the initial Cr/(Cr + Ce) Molar Percentage) on the structures of these catalysts and their photocatalytic performances in reduction of CO2 with H2O were investigated. The results indicated that the introduction of Cr species could effectively extend the spectral response range from UV to visible light region (400–700 nm) and improve the electronic conductivity for the mesoporous CeO2 catalysts which exhibited an enhanced photocatalytic activity in the reduction of CO2 with H2O when compared with the non-doped counterpart. The highest CO and CH4 yield of 16.2 μmol/g-cat. and 10.1 μmol/g-cat., respectively, were acquired on the optimal chromium doped CeO2 catalyst with the initial Cr(Cr + Ce) Molar Percentage of 15% under 8 h visible-light irradiation, which were more than twice as high as that of bare CeO2. The remarkably increased photocatalytic performance should be attributed to the advantageous structural and compositional features of the chromium doped mesoporous CeO2.
Henri Brunengraber - One of the best experts on this subject based on the ideXlab platform.
-
Assay of the Acetyl-CoA Probe Acetyl-Sulfamethoxazole and of Sulfamethoxazole by Gas Chromatography-Mass Spectrometry
Analytical biochemistry, 1993Co-Authors: Z. Ying, K. C. Agarwal, M. Beylot, M. V. Soloviev, F. David, M. W. Reider, Kou-yi Tserng, Henri BrunengraberAbstract:We present gas chromatographic-mass spectrometric assays for (i) the concentration of sulfamethoxazole and (ii) the concentration and Molar Percentage enrichment of acetyl-sulfamethoxazole in biological fluids. The compounds are extracted with ethyl acetate, derivatized with either diazomethane or pentafluorobenzyl bromide, and analyzed by gas chromatography-mass spectrometry. Quantitation is achieved using internal standards, [2H4]sulfamethoxazole and acetyl-[2H4]sulfamethoxazole. Limits of detection are 200 nmol for the methyl derivatives and 2 nmol for the pentafluorobenzyl derivatives. The high sensitivity of the assay with the pentafluorobenzyl derivatives allows measuring in plasma and urine (i) the pharmacokinetics of sulfamethoxazole and acetyl-sulfamethoxazole and (ii) the stable isotope enrichment of the acetyl moiety of acetyl-sulfamethoxazole. The latter is used as a probe for the noninvasive chemical biopsy of liver extramitochondrial acetyl-CoA.