The aim of this work was to study the biodiesel production from cotton seed oil by lipase produced by Pichia guilliermondii lipase, which was immobilized onto hydrophobic magnetic particles (HMPs). The optimum reaction conditions were determined for lipase dosage, methanol-to-oil molar ratio, temperature and water content. Using response surface methodology, a quadratic polynomial equation was ...

Clinical Medicine Vol 8 No 6 December 2008 621 © Royal College of Physicians, 2008. All rights reserved. It has been over a century since Sir Archibald Garrod first recognised the existence of inherited metabolic diseases (IMD).1 Technological and scientific advances have gradually led to greatly increased understanding of their aetiology and pathogenesis, and have ultimately resulted in effect...

this study propose a new analytical protocol for the determination of benzene, xylene, toluene and styrene in water samples using homogeneous liquid-liquid microextraction via flotation assistance (hllme-fa) technique followed by gas chromatography-mass spectrometry (gc-ms). in this research, a special extraction cell was designed to facilitate collection of the low-density solvent extraction. ...

Analytical methods employed for the determination of drugs and metabolites in biological matrices such as urine, plasma and serum are essential throughout drug discovery and development. It is well-known that, analytical techniques are constantly undergoing change and improvements and each analytical method has its own characteristics which may vary from analyte to analyte at different conditio...

the aim of this study was to investigate the removal of toluene from air through nano-graphene modified by ionic liquid (ng-il). the batch adsorption experiments in glass bottle of gas chromatography equipped with flame ionization detector (gc-fid) were used. graphene ultrahigh-quality synthesized by substrate-free gas-phase method in a single step and graphene sheets were deposited with ionic-...

[1] As part of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA)Cooperative LBA Airborne Regional Experiment (CLAIRE) 2001 campaign in July 2001, separate day and nighttime aerosol samples were collected at a ground-based site in Amazonia, Brazil, in order to examine the composition and temporal variability of the natural ‘‘background’’ aerosol. We used a high-volume sampler to ...

Tripterygium wilfordii (Hook. f.) is a woody vine of the Celastraceae family, and native to China (south of the Yangtze River), Korea, and Japan, is used in the clinic for the treatment of inflammatory and autoimmune diseases, especially rheumatoid arthritis. In this study, we developed a urine metabolomic method by gas chromatographymass spectrometry (GC-MS) to evaluate the effect of Tripteryg...

194 CLINICAL CHEMISTRY, Vol. 25, No. 1, 1979 gas chromatography before and after acid (6 mol/L HC1) and alkaline (NaOH) hydrolysis. We frequently observe a peak in the lactic acid position after alkaline hydrolysis. After acid hydrolysis of the same urine no lactate isobserved, but a peak appears in the position of levulinic acid. The mass spectra of these two peaks were identical with those of...

During barrel maturation, the volatile compounds extracted from oak wood can contribute to a wine’s overall aroma and flavour, enhancing its character and complexity. However, barrels have a finite pool of extractable material and the amounts of oak derived volatile compounds available for extraction diminish over time. As a consequence, barrels are typically decommissioned after five to six ye...