نتایج جستجو برای: ethylenglycol esters
تعداد نتایج: 28413 فیلتر نتایج به سال:
We report here the syntheses and the photolytic properties of 3-(4,5-dimethoxy-2-nitrophenyl)-2-butyl (DMNPB) esters as new photoremovable groups for carboxylic acids, and their use for the caging of L-glutamate. A high-yielding synthesis of the DMNPB esters led to a 4:1 threo/erythro diastereomeric mixture, which could be separated by HPLC. While these esters were stable in neutral buffer, pho...
Over the past decade it has become increasingly clear that steroid hormones are enzymatically esterified with fatty acids. These steroidal esters are the natural analogs of synthetic esters that are used therapeutically. One such family of pharmacological steroids is the synthetic alkyl esters of testosterone, androgens with great hormonal potency. We have investigated whether testosterone este...
Great effort has been devoted to the development of new strategies for glycosidic coupling owing to the growing importance of synthetic oligosaccharides in glycobiology.1 In the past decades, methods for construction of glycosidic linkages have progressed considerably.2 However, compared to the synthesis of oligopeptides and oligonucleotides, the synthesis of oligosaccharides is still laborious...
Deficiency of acyl CoA:cholesterol acyltransferase 2 (ACAT2) in mice results in a reduction in cholesterol ester synthesis in the small intestine and liver, which in turn limits intestinal cholesterol absorption, hepatic cholesterol gallstone formation, and the accumulation of cholesterol esters in the plasma lipoproteins. Here we examined the contribution of ACAT2-derived cholesterol esters to...
A supercritical fluid chromatography-based targeted purification workflow using tandem mass spectrometry and molecular networking was developed to analyze, annotate and isolate secondary metabolites from complex mixture. This approach was applied for targeted isolation of new antiviral diterpene esters from Euphorbia semiperfoliata whole plant extract. The analysis of bioactive fractions reveal...
The permeation properties of twenty newly synthesized α-alkoxyalkanoyl and α-aryloxyalkanoyl C-21 esters of standard corticosteroids: Fluocinolone acetonide, dexamethasone, triamcinolone acetonide and hydrocortisone were established using a PAMPA assay (70% silicone oil and 30% isopropyl myristate). The data were compared with parent corticosteroids with addition of mometasone furoate and hydro...
Phthalate esters have been widely used in industrial nations as plasticizers, in cosmetics, insect repellants, and munitions (Ribbons et al., 19847 Peakall, 1975). Due to the abundance of plastic materials in use, it has been estimated that 51 million pounds of phthalate esters leach into the environment annually (Ribbons et al., 1984). Phthalate esters have been found in many environmental sam...
Increases in activity of both protein kinase A (PKA) and protein kinase C (PKC) contribute to short-term facilitation of Aplysia sensorimotor synapses evoked by serotonin (5-HT). We report here that increasing levels of cAMP in sensory neurons evokes increases in both synaptic efficacy and in the number of sensory neuron varicosities contacting the major axons of motor cell L7 at intermediate t...
barium salts of dibenzylidene cystines 8a-c were obtained from the reaction of lcystine with benzaldehyde or its derivatives in the presence of barium hydroxide. their reduction with zinc and hydrochloric acid in methanol yielded the narylmethylcysteines ?9a-c?. these can, in turn, be converted by esterification into the methyl esters ?10 a-c. ?reaction of n, n'-carbonyl diimidazole (im co...
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