摘要:
Chromogenic derivatives of N-acetylneuraminic acid modified in the 4-position by eliminating the hydroxyl group, by replacing the hydroxyl group with fluorine, or by replacing the hydrogen of the hydroxyl group with methyl are used as substrates in colorimetric assays for human influenza neuraminidase activity in clinical specimens for the purpose of selectively diagnosing influenza infection. The substrates may exhibit different reactivity with the different types of influenza neuraminidases, thus enabling one to discern the specific type of influenza infection and prescribe appropriate treatment and/or supportive therapy therefor.
摘要:
La presente invention concerne en tant que produits industriels nouveaux les composés benzopyranone-β-D-thioxylosides de formule : dans laquelle : - l'un des substituants R ou R′ représente un atome d'oxygène doublement lié au carbone cyclique et l'autre représente un groupe R₁, - le symbole représente une double liaison conjuguée au groupe CO représenté par l'un des substituants R ou R′, - X représente un atome de soufre ou un atome d'oxygène, - R₁ et R₂, identiques ou différents, représentent chacun un atome d'hydrogène, un groupe alkyle en C₁-C₄, un atome d'halogène, un groupe trifluorométhyle, un groupe phényle, R₁ et R₂, considérés ensemble, pouvant former avec le groupe benzopyranone auquel ils sont liés, un groupe 7,8,9,10-tétrahydrodibenzo[b,d]pyran-6-one ou un groupe 1,2,3,4-tétrahydro-9H-xanthène-9-one ; et, - Y représente l'atome d'hydrogène ou un groupe acyle aliphatique. Ces composés sont utiles en thérapeutique notamment en tant qu'agents antithrombotiques veineux.
摘要:
A therapeutic agent for liver disease containing as an active ingredient a piperazine derivative having the formula: wherein, A represents a phenyl, p-benzoquinonyl or cumarinyl group which may have at least one substituent selected from the group consisting of halogen, alkyl, fluoroalkyl, formyl, alkoxycarbonyl, acyl, hydroxy, alkoxy, acyloxy, glycosyloxy, amino, alkylamino, mercapto, alkylthio and nitro; B represents a single bond or a straight chain alkylene group containing 1-4 carbon atoms which may have at least one substituent selected from the group consisting of alkyl, aryl, aralkyl, hydroxy and oxo; R represents an atom or a group selected from the group consisting of hydrogen, alkali metal, alkaline earth metal, alkyl, cycloalkyl, aralkyl and aryl; and n is 2 or 3, or its pharmaceutically acceptable salt is diclosed.
摘要:
A method for preparing chromogenic α-amylase substrate compounds at substantially high preparative yields in a relatively short period of time by the transglucosylation of a chromogenic glucoside compound to a maltooligosaccharide chain. The concentration of the maltooligosaccharide compound is greater than about 3 times the concentration of the chromogenic glucoside compound to result in at least about 50% of the chromogenic glucoside compound being converted to the desired chromogenic α-amylase substrate compound.