Chemical synthesis of p-nitrophenyl β-sophoroside and p-nitrophenyl β-laminarabioside
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منابع مشابه
CHEMICAL SYNTHESIS OF p-NITROPHENYL p-NITROPHENYL ~LAh%INARABIOSlDE*
Condensation OF tetra-U-acetyk-D-glucopyranosyl bromide withpnitrophenyl 4,6-O-benzylidene-/?-D-glucopyranoside followed by appropriate deblocking reactions gives rise to an approximately equimolar mixture of p-nitrophenyl @,ophoroside and pnitrophenyi Plaminarabioside. The two glycosides are readiIy separated and isolated in pure form by cellulose-column chromatography.
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The crystal structure of the title compound, K+.C6H4NO6S-, is built up from p-nitrophenyl sulfate anions and potassium cations. Adjacent anions form dimers, which are linked together in a three-dimensional network via short C-H...O contacts. The coordination sphere of the K+ ions may be described as a distorted square antiprism. The crystal structure is further stabilized by pi-pi stacking inte...
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Cytoplasmic aldehyde dehydrogenase catalyses the hydrolysis of methyl p-nitrophenyl (PNP) carbonate at an appreciable rate that is markedly stimualted by NAD+ or NADH. The nuleotides accelerate the rate-limiting hydrolysis of the acyl-enzyme intermediate while slowing the observed burst of p-nitrophenoxide production. With PNP dimethylcarbamate the enzyme catalyses the slow release of approx. 1...
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The dependence of the catalytic activities of α-chymotrypsin on the concentration of organic cosolvents (acetonitrile, dimethyl sulfoxide, dimethyl formamide, ethylene glycol, methanol, ethanol, propan-2-ol and tert-butanol) in mixed aqueous media has been studied towards hydrolysis of p-nitrophenyl acetate and p-nitrophenyl benzoate using cetyltriphenylphosphonium bromide surfactant at pH 7.75...
متن کاملphthalein /3-D-glucuronide, p-nitrophenyl N-acetyl-/3-D-glucosaminide, p-nitrophenyl /3-D-fucoside, p- nitrophenyl /3-D-galactoside and 6-bromo-2-naphthyl /3-D-galactopyranoside from Sigma Chemical CO.(U.S.A..), phenyl /3-D-galactopyranoside from Nakarai
p-Hydroxyphenylacetaldoxime (HPAAO) (anti and syn forms) obtained by fermentation arid its analogs chemically synthesized were tested for their activities to inhibit various glycosidases. HPAAO inhibited bovine liver /3-galactosidase in a competitive manner at pH 17.0 with an apparent Ki value of 8 x 10-8 M. HPAAO also inhibited various mammalian /3.glycosidases which had pH optima between 6.0 ...
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ژورنال
عنوان ژورنال: Carbohydrate Research
سال: 1969
ISSN: 0008-6215
DOI: 10.1016/s0008-6215(00)80080-4