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Kh. A. Arifkhodzhaev 《Chemistry of Natural Compounds》1986,22(4):386-388
From the WSPS-I of the bulbs with roots ofJuno drepanophylla, 15 fractions have been isolated by fractionation on DEAE-cellulose. Fractions 1 and 2 together made up 53% of the total weight of the fractions. Fraction 1 proved to be homogeneous on ultracentrifugation, on passage through Sepharose-4B, and on high-pressure LC. The results of the analysis of the methylated product of fraction 1 differed little from those for the initial polysaccharide. 相似文献
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Kh. A. Arifkhodzhaev 《Chemistry of Natural Compounds》1987,22(4):380-385
Polysaccharides (WSPSs, PSs, and HMCs) have been isolated from various organs ofJuno Drepanophylla and their qualitative compositions have been characterized. ESPS-I from the bulbs has been studied and has proved to be a polydisperse high-molecular-weight and branched amyloid. In its physicochemical properties and composition, WSPS-I is close to amyloids of the first class known from the literature. On the basis of the results of methylation, oxidation with chromium trioxide, and IR and13C NMR spectra, it has been established that the glucopyranose residues are linked with one another by -(1 4) bonds, and the xylo and galactopyranose residues by (1 4) bonds with the C-6 position of the glucose residue.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 410–415, July–August, 1986. 相似文献
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Kh. A. Arifkhodzhaev 《Chemistry of Natural Compounds》1986,22(4):380-385
Polysaccharides (WSPSs, PSs, and HMCs) have been isolated from various organs ofJuno Drepanophylla and their qualitative compositions have been characterized. ESPS-I from the bulbs has been studied and has proved to be a polydisperse high-molecular-weight and branched amyloid. In its physicochemical properties and composition, WSPS-I is close to amyloids of the first class known from the literature. On the basis of the results of methylation, oxidation with chromium trioxide, and IR and13C NMR spectra, it has been established that the glucopyranose residues are linked with one another by β-(1 → 4) bonds, and the xylo and galactopyranose residues by α(1 → 4) bonds with the C-6 position of the glucose residue. 相似文献
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A neutral polysaccharide, named ukonan D, was isolated from the rhizome of Curcuma longa L. It produced a single band on electrophoresis and a single peak on gel chromatography, and its molecular mass was estimated to be 28,000. It showed remarkable reticuloendothelial system-potentiating activity in a carbon clearance test. Ukonan D is composed of L-arabinose: D-galactose: D-glucose: D-mannose in the molar ratio of 1:1:12:0.2, in addition to small amounts of peptide moiety. Methylation analysis, carbon-13 nuclear magnetic resonance and enzymic degradation studies indicated that its structural features include mainly both alpha-1,5-linked L-arabino-beta-3,6-branched D-galactan type and alpha-4,6-branched D-glucan type structural units. The influence of degradation with alpha-amylase followed by the elimination of glucan side chains on its immunological activity was discussed. 相似文献
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小刺猴头菌子实体多糖经乙醇分级和Sepharose CL-6B柱层析,得到多糖HPⅡ.经Sephadex G-100柱层析,高压玻璃纤维纸电泳,比旋光度测定等方法鉴定:HPⅡ在相对分子质量大小和极性上都较为均一.经部分酸水解、高碘酸氧化、Smith降解、IR分析、甲基化分析、GC和GC/MS联机分析等方法,确定了其结构:(1→6)Glc构成主链的核心结构,在3-O处有分枝,平均每7个己糖残基有3个分枝残基;A,B为侧链结构,其构成成分为Glc和Gal;末端残基为(1→)Glc. 相似文献
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沙棘果皮水溶性多糖H_n的结构研究 总被引:2,自引:0,他引:2
沙棘果皮水溶性多糖经酸性乙醇分级和DEAE -SephadexA - 2 5柱层析纯化 ,得到多糖Hn.经SepharoseCL - 4B柱层析、玻璃纤维纸电泳、比旋光度测定等方法鉴定Hn 为均一多糖 .经唾液淀粉酶解、部分酸水解、高碘酸氧化、Smith降解、甲基化分析及IR ,1 3C -NMR ,GC和GC -MS等方法 ,确定其基本结构中主链由 1→ 4Glc基、1→ 6Man基和 1→ 6Gal基构成 .三者摩尔比为nGlc∶nMan∶nGal=3∶1 .5∶1 ,分支点在 3—O处 ,分支率为 43% ,侧链由 1→ 6Gal基、1→ 4Glc基、末端Glc或末端Ara基构成 . 相似文献
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Characterization of water in polysaccharide hydrogels by DSC 总被引:1,自引:0,他引:1
H. Yoshida T. Hatakeyama H. Hatakeyama 《Journal of Thermal Analysis and Calorimetry》1993,40(2):483-489
Water molecules in hydrogels were classified into three categories according to phase transition behavior; non-freezing, freezing
bound and free water. Melting, crystallization, and glass transition of water in hydrogels reflected the state of the water
interacting with polysaccharides. Freezing bound water formed metastable ice by slow cooling and formed amorphous ice by quenching.
From the isothermal crystallization measurement, nucleation rate and crystal growth rate were obtained. The crystal growth
rate of freezing bound water was about ten times slower than that of free water. The DSC characterization of water in hydrogels
was summarized.
Zusammenfassung In übereinstimmung mit dem Phasenum wandlungsverhalten werden Wassermoleküle in Hydrogelen in drei Kategorien eingestuft; nicht gefrierendes, gefrierendes gebundenes und freies Wasser. Das Schmelzen, die Kristallisation und die Glasumwandlung von Wasser in Hydrogen wiederspiegeln den Zustand von Wasser, welches in Wechselwirkung mit Polysacchariden tritt. Gefrierendes gebundenes Wasser bildet metastabiles Eis durch langsames Abkühlen und amorphes Eis durch Abschrecken. Anhand isothermer Kristallisationsmessungen wurden Keimbildungsgeschwindigkeit und Kristallwachstumsgeschwindigkeit erhalten. Die Kristallwachstumsgeschwindigkeit von gefrierendem gebundenem Wasser liegt zehnmal niedriger als die von freiem Wasser.相似文献
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Polysaccharides of Matricaria chamomilla I. Monosaccharide composition of the polysaccharide complex
Conclusions 1. A polysaccharide has been isolated from the inflorescences ofMatricaria chamomilla L. It has been established that it is composed of D-galacturonic acid (45%), D-galactose (12.2%), D-glucose (2.3%), L-rhamnose (5.3%), L-arabinose (10.2%), and D-xylose (20.8%).2. The information obtained permits the polysaccharide of the camomile to be assigned to the class of pectin substances.Academician I. P. Pavlov Ryazan' State Medical Institute. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 137–141, March–April, 1974. 相似文献
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Conclusions 1. From the neutral fraction of the oleoresin ofPinus sibirica R. Mayr have been isolated new macrocyclic diterpene compounds-isocembrene (I) and isocembrol (VI).2. It has been shown that isocembrol is readily dehydrated into cembrene and isocembrene.Khimiya Prirodnykh Soedinenii, Vol. 5, No. 1, pp. 10–14, 1969 相似文献
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