Showing papers on "Anthrone published in 1981"
TL;DR: A method for quantitative estimation of glycerol and total carbohydrate in biological samples is described and uses of this method to determine glycersol and carbohydrate content in lipids of chicken egg-yolk samples are presented.
85 citations
38 citations
TL;DR: In this paper, it was shown that the quinone methide from guaiacylglycol-β-guaiacyls ether [l-(3methoxy-4-hydroxyphenyl)-2-(2-methoxyphenoxy)ethanol] formed carbon-carbon bonded adducts with both anthrone and anthrahydroquinone (AHQ).
Abstract: The quinone methide from guaiacylglycol-β-guaiacyl ether [l-(3-methoxy-4-hydroxyphenyl)-2-(2-methoxyphenoxy)ethanol] formed carbon-carbon bonded adducts with both anthrone and anthrahydroquinone (AHQ). It was found that the anthrone adduct [l-(3-methoxy-4-hydroxyphenyl)-1-(anthracen-9-one-10-yl)-2-(2-methoxyphenoxy)ethane] was much more resistant to alkaline degradation than the corresponding AHQ-adduct Jl-(3-methoxy-4-hydroxyphenyl)-l-(10-hydroxyanthracen-9-one-10-yl)-2-(2-methoxyphenoxy)ethane]. It was demonstrated, by NMR spectroscopy that analogous anthrone and AHQ adducts formed with milled wood lignin and had relative alkaline stabilities consistent with those observed with the model adducts. At 10° C the AHQ-lignin adduct partially decomposed to the Y-monoacetates of coniferyl alcohol and p_-coumaryl alcohol which subsequently reacted with excess AHQ to give the novel adducts, trans-1-(3-methoxy-4-hydroxyphenyl)-3-(10-hydroxyanthracen-9-one-10-yl)propene, and trans-1-(4-hydroxyphenyl)-3-(1...
11 citations
TL;DR: Results of 13C and 2H n.r.m. analyses of [2H33]- and [1,2-13C22]-acetate-enriched tajixanthone are reported, which indicate that ring cleavage of an anthraquinone, and not anthrone, precursor must precede C-prenylation, and that dihydropyran ring formation precedes xanthone ring formation during biosynthesis of tajxanthone.
Abstract: The results of 13C and 2H n.m.r. analyses of [2H33]- and [1,2-13C22]-acetate-enriched tajixanthone are reported, which indicate, inter alia, that ring cleavage of an anthraquinone, and not anthrone, precursor must precede C-prenylation, and that dihydropyran ring formation precedes xanthone ring formation during biosynthesis of tajixanthone.
8 citations
TL;DR: A detailed analysis of the product mixtures by gas chromatography-mass spectrometry (GC/MS) was undertaken in order to understand how AHQ retarded phenolic-quinonemethide condensation reactions as discussed by the authors.
Abstract: Several experiments have been performed to show the effects of anthrahydroquinone (AHQ), the reduced form of anthraquinone (AQ), on the self-condensation reactions of simple lignin models. These experiments were aimed at understanding the role of AQ as a wood pulping catalyst. The experiments led to some very complex product mixtures. A detailed analysis of the product mixtures by gas chromatography - mass spectrometry (GC/MS) was undertaken in order to understand how AHQ retarded phenolic-quinonemethide condensation reactions. The interpretation of the mass spectra is reported here. Two principal classes of compounds are discussed: phenolic condensation products and adducts derived from the reactions of quinonemethides with AHQ and anthrone. A method of volatilizing the sample prior to GC/MS analysis, namely derivatization with dimethyl sulfate In alkaline THF, produces by-products which contain incorporated THF.
5 citations
Patent•
29 Jun 1981
TL;DR: The titled manno-gulonoglycan was obtained by reducing polyacyl uronic acid prepared by the reaction of polyuronic acid derived from seaweeds (e.g. sargasso) with an acylating agent, and hydrolyzing the acyl group of the product with an alkali as mentioned in this paper.
Abstract: NEW MATERIAL:The titled manno-gulonoglycan having the following physical and chemical properties: elemental analysis, C 45.9%, H 6.8%; molecular weight, 5,600+ or -500 (by gel permeation method); appearance, white powder; decomposition point, 179 deg.C; UV absorption spectrum, specific peak near 260mmu; pH 5.0 (0.3% aqueous solution); solubility, soluble in water and pyridine, insoluble in methanol, acetone, chloroform, etc.; specific rotatory power, [alpha]D =-96.2+ or -0.4 deg.(C= 0.136g/water 100ml); color reaction, positive to anthrone sulfuric acid, carbazole, copper Folin reaction, etc., negative to Fehling, ninhydrin reactions, etc.; composition of saccharide, contains D-mannose and L-gulose as constituents at a ratio of 5.08+ or -0.41:1, etc. USE:Antitumor agent. PROCESS:The titled substance is obtained by reducing polyacyl uronic acid prepared by the reaction of polyuronic acid derived from seaweeds (e.g. sargasso) with an acylating agent, and hydrolyzing the acyl group of the product with an alkali.
1 citations
Patent•
25 Nov 1981TL;DR: In this article, the authors described a process for the preparation of anthrone by catalytic hydrogenation of anthraquinone, characterised in that anthrone is hydrogenated with hydrogen at temperatures from approximately 320 K to approximately 480 K and pressures from approximately 1 to approximately 100 bar, in the presence of an aromatic solvent and which contains copper and at least one further metal from the group comprising vanadium, chromium, manganese, iron and molybdenum.
Abstract: Process for the preparation of anthrone by catalytic hydrogenation of anthraquinone, characterised in that anthraquinone is hydrogenated with hydrogen at temperatures from approximately 320 K to approximately 480 K and pressures from approximately 1 to approximately 100 bar, in the presence of an aromatic solvent and in the presence of a catalyst which is optionally applied to a support and which contains copper and at least one further metal from the group comprising vanadium, chromium, manganese, iron and molybdenum, in reduced or oxidised form.
TL;DR: A colorimetric method using an anthrone reagent has been developed for the direct quantitative determination of digitonin oxidized with NaIO4 in solution and after immobilization on Aminosilochrome and the results agree with the results obtained by the sorption of cholesterol from blood serum.
Abstract: A colorimetric method using an anthrone reagent has been developed for the direct quantitative determination of digitonin oxidized with NaIO4 in solution and after immobilization on Aminosilochrome. The amounts of immobilized digitonin found agree with the results obtained by the sorption of cholesterol from blood serum.
Patent•
26 May 1981
TL;DR: A substance TH69E having the following properties: elementary analysis: C, 24.25%; H, 4.46%; N, 6.55%; pH of the aqueous solution 6.7-7.1; positive to phenol-sulfuric acid, anthrone and Molisch reactions, etc; negative to the Elson-Morgan reaction, etc. as mentioned in this paper.
Abstract: NEW MATERIAL:A substance TH69E having the following properties: Elementary analysis: C, 24.25%; H, 4.46%; N, 6.55%. Molecular weight: about 600,000+ or - 15,000 (Biogel P-series column). White amorphous powder. Decomposition point: 180 deg.C (browned by the capillary method with a silicone oil WF-30). pH of the aqueous solution 6.7-7.1. Soluble in water; insoluble in ethanol, acetone, n-hexane, etc. Positive to the phenol-sulfuric acid, anthrone and Molisch reactions, etc.; negative to the Elson-Morgan reaction, etc. USE:A carcinostatic agent, a preventive and remedy for infectious diseases, an interferon inducer and a remedy for fibrosis. PROCESS:A strain, e.g. Streptococcus faecalis And. & Hord. TH-001 (FERM-P No.4861), belonging to the genus Streptococcus, is cultivated an aerobically, perferably at 37 deg.C, for 24-48hr, and the titled substance is separated and purified.