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Conditions for the esterification of polyethylene glycol400 (PEG400) with lauric acid by immobilized lipase from Candida sp. 1619 in a solvent-free system were investigated. The esterification degree was increased greatly through the dehydration that occurred during the reaction. When the amount of lauric acid added exceeded the stoichiometric amount the(More)
OBJECTIVE We screened and isolated bacterial strains from the perennial administration quinclorac paddy fields to degrade quinclorac. METHODS Strain MC-10, which can degrade quinclorac efficiently, was screened by enrichment and selective medium. The strain was identified by morphological, physio-biochemical characteristics and 16S rDNA gene sequence(More)
Conditions for esterification in tert-butanol using fatty acid as acy1 donor and saccharides or saccharide alcohols as acy1 acceptors, immobilized lipase from Candida sp. 1619 as biocatalyst were investigated. Optimal temperature and pH for esterication were 40 degrees C-45 degrees C and 5.5-7.5, respectively. Among the 13 acy1 donors compared, the best(More)
Samples of surface soil from tobacco (Nicotiana tabacum L.) fields were analysed for heavy metals and showed the following concentrations (mean of 246 samples, mg/kg): As, 5.10; Cd, 0.11; Cr, 49.49; Cu, 14.72; Hg, 0.08; Ni, 19.28; Pb. 20.20 and Zn, 30.76. The values of the index of geoaccumulation (I geo) and of the enrichment factor indicated modest(More)
Factors influencing the synthesis of mono- and diester of polyethylene glycol400 (PEG400) oleate with immobilized lipase from Candida sp.1619 as biocatalyst were investigated. Mono- and diester were formed with different molar ratios of the substrates after reacting for 6 hours. The amount of monoester to diester formed was in the range of 3.5:1 to 4.1:1(More)
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