BACKGROUND Enzymes are often used in organic solvents for catalyzing organic synthesis. Two enzyme preparations, EPRP (enzyme precipitated and rinsed with n-propanol) and PCMC (protein coated microcrystals) show much higher activities than lyophilized powders in such systems. Both preparations involve precipitation by an organic solvent. The clear understanding of why these preparations show hi...

Rising world fuel prices, the growing demand for energy, and concerns about global warming are the key factors driving renewed interest in renewable energy sources and in bioenergy. Nowadays, the world energy demand has increased significantly due to the global industrialization and increase of population. As a result, the current limited reservoirs will soon be depleted at the current rate of ...

The object of research is the process chemical transesterification palm olein with increased oxidation indicators in presence potassium glyceroxide catalyst. Transesterification an important method fat modification. use fats leads to deactivation common catalysts and a decrease efficiency process. There need increase dosage catalysts, temperature, which negatively affects product quality. An al...

Biodiesel, an environmentally friendly biomass-based fuel, is gaining popularity globally as a cost-effective way to meet rising fuel demand. However, the high cost of raw materials and catalysts continues drive up biodiesel production. An alternative feedstock with heterogeneously catalyzed reaction could be most stabilize industrial growth. Understanding these issues led idea using waste palm...

Biodiesel research has been carried out via transesterification. However, biodiesel products (methyl esters) have not encountered new insights, because feedstocks explored and studied. Various optimum conditions on transesterification reaction could produce different methyl ester type with compound. So, this review describes various oil feedstock that were to find insights about type. The took ...

A rapid, accurate microtechnique has been developed for gas chromatographic determination of the fatty acid composition of small (2-3 micro l) samples of vegetable oils. This microtechnique combines transesterification and sample injection into a single operation. The fatty acid compositions of soybean, linseed, and safflower oils thus determined are compared with those obtained by the usual tw...

A catalytic protocol for the base-mediated amidation of unactivated esters with amino alcohol derivatives is reported. Investigations into mechanistic aspects of the process indicate that the reaction involves an initial transesterification, followed by an intramolecular rearrangement. The reaction is highly general in nature and can be extended to include the synthesis of oxazolidinone systems...

A number of aminoglycoside antibiotics, and in particular neomycin B, are demonstrated to promote strand cleavage of RNA oligonucleotides (minimised HIV-1 TAR element and prokaryotic ribosomal A-site), by binding and causing sufficient distortion to the RNA backbone to render it more susceptible to intramolecular transesterification.

The transesterification of D-allose (the C-3 epimer of D-glucose) with vinyl octanoate using Candida antarctica lipase in tetrahydrofuran proceeded with high regioselectivity to produce 6-O-octanoyl-D-allose with nearly complete conversion. The growth-inhibiting activity of 6-O-octanoyl-D-allose on lettuce seedlings was about 6-fold greater than that of D-allose.