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研究含芳环(生色团)的亲水性高分子对于了解高分子结构和性质之间的关系,开发新型发光材料很有意义[1.2].前文[3.4]借报道了N-乙烯基咋冷丙烯酸共聚物(NVC-AA)的合成及发光性能研究,本文报道含苯环亲水高分子苯乙烯一丙烯酸共聚物(ST-AA)的微观结构与荧光特性?.. 相似文献
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Uryu T Sugie M Ishida S Konoma S Kato H Katsuraya K Okuyama K Borjihan G Iwashita K Iefuji H 《Applied biochemistry and biotechnology》2006,135(1):15-31
Ethanol was produced in a considerably high yield by fermenting hydrolyzates from cellulosic materials by means of a recombinant
laboratory yeast expressing β-glucosidases. Tissue paper, cotton, and sawdust were hydrolyzed by two-step sulfuric acid hydrolysis
to give mixtures containing glucose, cellobiose, and higher cello-oligosacc arides. After the cellulosic material was partially
hydrolyzed with 80% sulfuric acid, the hydrolysis was continued with 5% sulfuric acid. Except for non-carbohydrate components,
all constitutents in the hydrolyzates were fermented by the yeast that was preincubated in the medium that the plasmid encoded
by the β-glucosidases gene was kept in the muliplicated yeast. A solution containing 4% hydrolyzates from paper was fermented
to give as high as 1.9% maximum ethanol concentration and 70% ethanol conversion. Cotton also gave a similar result. Sawdust
was converted into ethanol in approx 22% conversion. Accordingly, it was revealed that the β-glucosidases-expressing yeast
can ferment the cello-oligosaccharides obtained by hydrolysis of cellulosic materials into ethanol. In addition, a hydrolyzate
containing a high glucose proportion gave a high ethanol concentration in a short time. 相似文献
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Chun‐Yan Hong Ye‐Zi You Ru‐Ke Bai Cai‐Yuan Pan Gereltu Borjihan 《Journal of polymer science. Part A, Polymer chemistry》2001,39(22):3934-3939
The polymerization of acrylic acid (AA) was performed under 60Co irradiation in the presence of dibenzyl trithiocarbonate at room temperature, and well‐defined poly(acrylic acid) (PAA) with a low polydispersity index was successfully prepared. The gel permeation chromatographic and 1H NMR data showed that this polymerization displays living free‐radical polymerization characteristics: a narrow molecular weight distribution (Mw/Mn = 1.07–1.22), controlled molecular weight, and constant chain‐radical concentration during the polymerization. Using PAA? S? C(?S)? S? PAA as an initiator, the extension reaction of PAA with fresh AA was carried out under 60Co irradiation, and the results indicated that this extension polymerization displayed controlled polymerization behavior. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 3934–3939, 2001 相似文献
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由于含氨基或氨基衍生物的多糖对细胞表面及细胞之间的生理功能具有特殊的作用,在研究细胞之间有效作用的促进剂和抑制剂方面具有潜在的应用价值,因而叠氮化多糖作为制备氨基多糖及其衍生物的中间体受到人们的重视,含乙酰氨基的天然多糖(如Chitin)和氨基多糖(如Chitosan),由于具有抗感染和医治创伤作用,广泛用于医疗领域,含氨基和硫酸酯的多糖肝素有很好的抗凝血作用和降血脂活性,已用于动脉硬化病的治疗,我们发现含乙酰氨基的硫酸化核聚糖具有很高的抗艾滋病毒活性,而且没有抗凝血的副作用。 相似文献
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Erdenebaatar Sarnaizul Gereltu Borjihan Huricha Baigude Aona Menghe Narisu Zhaorigetu 《Biomedical chromatography : BMC》2013,27(7):821-824
Only one kind of synthesized alkaloid, piperlonguminine, was used to understand the interference of the other alkaloids in pharmacokinetic study using HPLC/UV in rat plasma after oral administration. Compared with the previous report, it was clarified that mixed alkaloids such as piperine and the other extract from Piper longum Linn did not interfere with the results. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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运用荧光及紫外-可见吸收光谱法研究了胡椒酸丁二醇单酯(简称BPM)与牛血清白蛋白(BSA)的相互作用。实验结果表明,胡椒酸丁二醇单酯与BSA形成基态复合物导致BSA内源性荧光猝灭,猝灭机理主要为静态猝灭和非辐射能量转移,其猝灭速率常数为Kq为1.077×1013L/(mol.s)(25℃)、0.946×1013L/(mol.s)(37℃)。利用荧光猝灭反应测得结合常数KA为2.6×106(25℃)、3.4×106(37℃),结合位点数n为1.30(25℃)、1.33(37℃)。根据Frster能量转移理论得到结合距离r=2.92nm(25℃)、2.66nm(37℃)和能量转移效率E=0.45(25℃)、0.43(37℃)。通过热力学参数计算,确定胡椒酸丁二醇单酯与BSA的相互作用是熵增加和吉布斯自由能降低的自发过程,主要作用力是疏水作用力。 相似文献
7.
Guo-Guang Liu Gereltu Borjihan Huricha Baigude Hedeki Nakashima Toshiyuki Uryu 《先进技术聚合物》2003,14(7):471-476
Sulfated astragalus polysaccharide (sulfated astragalan, SA) was prepared by chemical modification of astragalus polysaccharide abstracted from an astragalus menbranceus used as a Mongolia herbal medicine. Anti-HIV activity of SA was assayed in vitro and the results indicated that the SA showing high anti-HIV activity and lower cytotoxity. Sulfation of astragalan was carried out by using sulfur trioxide-pyridine complex in a mixture of dimethylsulfoxide (DMSO) to give sulfated astragalan with degree of substitution (DS) of 1.14–1.20 and a number average molecular weight (Mn) of 1.27–1.46 × 104. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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Huricha Baigude Kaname Katsuraya Shinichi Tokunaga Naohiko Fujiwara Masaya Satoyama Tomohiro Magome Kohsaku Okuyama Gereltu Borjihan Toshiyuki Uryu 《Journal of polymer science. Part A, Polymer chemistry》2005,43(11):2195-2206
A novel cellobiose–polylysine dendrimer with reducing sugar terminals was synthesized in which the reactive reducing end of a disaccharide cellobiose was directing outward. Hexa‐O‐benzyl‐4′‐(1‐carboxyethyl)‐cellobioside (HBCEC) was synthesized through the reaction of a 4′‐hydroxyl group of benzyl hexa‐O‐benzyl‐cellobioside with methyl 2‐chloropropionate, followed by the removal of the methyl ester group. HBCEC was reacted with polylysine dendrimer generation 3 (G3) to produce benzylated cellobiose–polylysine dendrimer G3. After debenzylation, a cellobiose–polylysine dendrimer G3 was obtained in which the reducing end of the cellobiose was the terminal group of the dendrimer. For the preparation of a dendrimer‐type acquired immunodeficiency syndrome vaccine, the cellobiose–polylysine dendrimer was reacted with a tripeptide (glycyl–prolyl–leucine) and a cyclic oligopeptide from the human immunodeficiency virus by reductive amination; this produced a tripeptide‐bound cellobiose–polylysine dendrimer and an insoluble compound, respectively. The structure analysis was carried out with NMR and matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 2195–2206, 2005 相似文献
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含咔唑高分子水溶液的室温磷光 总被引:2,自引:0,他引:2
含咔唑高分子水溶液的室温磷光博日吉汗·格日勒图,印杰(内蒙古师范大学化学系,呼和浩持,010022)(上海交通大学应用化学系)关键词磷光,铊离子,N-乙烯基咔唑-丙烯酸共聚物芳香族化合物吸收辐射后可在室温发射荧光,但芳香族化合物小分子只有在低温(77... 相似文献