نتایج جستجو برای: acidic hexane
تعداد نتایج: 40901 فیلتر نتایج به سال:
Simultaneous preconcentration of phenol, 2-chlorophenol, 3-chlorophenol, 4-chlorophenol, 2-nitrophenol, 4-nitrophenol, and 2,4-dinitrophenol was improved by using olive wood (OW) washed with ethanol then pyrolyzed at 200°C as preconcentrating sorbent. Various OW sorbents were prepared by either washing OW (with ethanol, ether, dichloromethane, tetrahydrofuran or n-hexane); or by pyrolysis (at 1...
A methanol extract from Scrophulia ningpoensis showed suppressive effect of the SOS-inducing activity of the mutagen 2-(2-furyl)-3-(5-nitro-2-furyl)acrylamide (furylfuramide) in the Salmonella typhimurium TA1535/pSK1002 umu test. The methanol extract was re-extracted with hexane, dichloromethane, butanol, and water. An acidic fraction of the dichloromethane fraction showed a suppressive effect....
A novel type of denitrifying bacterium (strain HxN1) with the capacity to oxidize n-alkanes anaerobically with nitrate as the electron acceptor to CO(2) formed (1-methylpentyl)succinate (MPS) during growth on n-hexane as the only organic substrate under strict exclusion of air. Identification of MPS by gas chromatography-mass spectrometry was based on comparison with a synthetic standard. MPS w...
n-hexane neuropathy has been described after glue sniffing and industrial exposure. onset may be subacute and reminiscent of guillain-barre' syndrome. five patients (15-18 years old) presented with paresthesia, severe weakness of the extremities particularly lower extremities, as well as muscular atrophy, total areflexia and gait disturbances were admitted in hospital in march 2003. all of thes...
This study examines the antimicrobial activity of the hexane, dichloromethane and methanol extracts of Lippia multiflora and carvacrol isolated from the hexane extract. The result shows the hexane extract to be the most active, while the methanol extract exhibited no antimicrobial activity. The isolated carvacrol from the hexane fraction showed tremendous antimicrobial activity. These results c...
PDMS-based films with 14 wt% carbon black were formed with varying amounts of hexane (Sigma-Aldrich) to determine the effect of the solvent on electrical resistance. Five formulations were prepared with hexane at 0, 100, 150, 200, and 300% by weight, relative to the pre-polymer. Without hexane, the suspension was a thick paste that had to be applied by doctor blading; with hexane, the suspensio...
This study was carried out to evaluate the Brine shrimp lethality (cytotoxicity), antiglycation, phytotoxicity, antiplatelet, antifungal, and antibacterial activities of Ajuga bracteosa. The n-hexane fraction of Ajuga bracteosa was investigated for various biological activities in vitro. Hexane extract showed promising phytotoxicity (100%) at the highest dose only. Interestingly, n-hexane fract...
BACKGROUND n-Hexane is a well-known neurotoxicant. Polyneuropathy due to occupational n-hexane exposure has been reported worldwide, however, our case is the first report in the Chinese herb industry. CASE PRESENTATION A 25-year-old Asian man experienced progressive weakness and numbness in his hands and feet after working as an operator in a Chinese medicine pharmaceutical plant for the manu...
Background and Aims: n-hexane is widely used in the production of glues, lacquers, paints, plastic, and rubber products. Therefore, a significant potential for exposure to this toxic solvent exists in industrial settings. This study was carried out to assess the exposure to n-hexane and to determine the correlation between this exposure and urinary concentration of free 2,5-hexanedione (2,5-H...
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