共查询到18条相似文献,搜索用时 93 毫秒
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利用基于天然生物高分子的绿色环保法制备纳米贵金属材料是当今纳米技术发展的一个重要方向之一. 利用丝胶蛋白(SS)为还原剂和分散剂合成了纳米银颗粒, 利用紫外-可见(UV-Vis)光谱、X射线衍射(XRD)、透射电镜(TEM)等研究了反应温度、pH值、SS/Ag+物质的量比对反应速率和合成的纳米银粒子形貌的影响. 实验结果表明, 利用本方法可以合成尺寸均匀且分散性良好的球形纳米银粒子, 且随着反应温度和溶液pH值的逐渐升高, 反应速率随之加快, 合成的纳米银粒子的粒径逐渐变小, 而SS/Ag+物质的量比的变化主要对纳米银粒子的尺寸有影响. 相似文献
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《化学进展》2017,(5)
丝胶蛋白来源于天然蚕茧,具有良好的生物相容性和一系列独特的生物学性能,是一种性能卓越的天然生物材料。丝胶蛋白特有的氨基酸组成和结构性质赋予了其良好的水溶性、促细胞黏附和增殖活性、原位荧光性、抗氧化活性以及酪氨酸酶抑制活性等。在交联剂、化学活性基团和紫外光等作用下,丝胶蛋白能交联形成微纳米结构材料、二维(图案化)膜材料、水凝胶或三维多孔支架,在创伤修复、组织再生、药物传递、生物医药和材料涂层等生物医学领域显示出广阔的应用前景。本文基于丝胶蛋白近年来重要的研究成果,综述了丝胶蛋白的结构和理化性质,重点讨论了丝胶蛋白材料的设计方法及其在生物医学中的最新应用,并对丝胶蛋白的发展趋势进行了展望。 相似文献
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以蚕茧丝胶蛋白源Tn抗原和T抗原为研究对象,采用“一釜法”、氨水催化法和链霉蛋白酶E(Pronase E)水解法对丝胶蛋白O-糖链进行释放,并通过固相萃取柱进行分级纯化,以高效液相色谱仪(HPLC)进行分离制备;利用电喷雾质谱(ESI-MS)、串联质谱(MS/MS)及在线液相色谱-质谱联用仪(Online LC-MS)进行了结构鉴定和定量分析.结果表明,丝胶蛋白中O-GalNAc含量为1.58μg/g, O-GalNAcGal含量为0.54μg/g,二者丰度比约为5.3∶1;并且氨水可高效释放出其还原性O-连接单糖GalNAc,通过液相色谱法可实现其精细分离纯化,而以等量Pronase E对丝胶蛋白水解可有效释放出Tn抗原和T抗原. 相似文献
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蚕丝纤维具有优良的力学性能 ,不同的环境条件对其力学性能有一定的影响 ,但其力学性能主要取决于形成纤维过程中所形成的以分子链 β-折叠结构及其沿纤维轴方向高度取向为特征的丝纤维凝聚态结构 [1,2 ] .因此在丝纤维的形成及丝蛋白膜的人工制备过程中 ,丝蛋白分子链的构象及其构象转变一直是研究的重点[3~ 6 ] .以蚕丝蛋白 (Silk Fibroin,SF)稀溶液在常温下浇铸的 SF膜一般以无规线团 /α-螺旋为主的构象状态存在 ;经热处理、极性溶剂 (如甲醇等 )处理、应力作用或共混入一些能与SF形成分子间氢键的聚合物组分后 ,SF膜的构象将从无… 相似文献
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不同温度下桑蚕丝的力学性能 总被引:7,自引:0,他引:7
在严格控温条件下,利用动态机械热分析仪(DMTA)对大量未脱胶和脱胶桑蚕丝的单丝样品在不同温度下拉伸,同时用SEM,TEM以及拉曼光谱观察蚕丝的断面形貌和内部结构的变化,结果表明,在实验温度范围内,蚕丝初始模量和断裂强度皆随温度的升高而降低,拉伸过程会导致丝素蛋白形成更多的β-结构,同时,丝胶表现出较差的力学性能,其主要作用是以涂层的形式丝素蛋白纤维进行保护。 相似文献
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Ki Hoon Lee 《Macromolecular rapid communications》2004,25(20):1792-1796
Summary: The thermal and structural analysis of silk fibroin (SF) and silk sericin (SS) blend films reveals that the crystallization of SF is retarded in the presence of SS. Although a phase separation was observed, there might be a strong interaction at the boundary of the SF and SS through intermolecular hydrogen bonding, which restricts the conformational transition of SF.
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丝胶基半互穿温敏凝胶的合成及其溶胀行为的研究 总被引:2,自引:0,他引:2
采用半互穿网络技术, 将具有生物相容性的丝胶蛋白(silk sericin)作为第二网络进入聚(N-异丙基丙烯酰胺)(PNIPAM)水凝胶网络中, 在水溶液中制备得到具有半互穿网络结构的丝胶基温敏水凝胶(SS/PNIPAM semi-IPNs). 采用称重法研究了产物的(消)溶胀、温度敏感性、最大溶胀度及脉冲响应行为; 利用扫描电镜(SEM), 差示扫描量热仪(DSC)和动态热机械分析仪(DMA)分别考察了产物的内部形态、热相转变行为和其储能模量随温度的变化. 结果表明: 具有较高亲水性的丝胶蛋白的引入增大了semi-IPNs水凝胶的内部孔径, 导致SS/PNIPAM半互穿水凝胶的溶胀度增加, 并且其储能模量随温度变化更明显. 相比于纯PNIPAM水凝胶, 半互穿水凝胶的消溶胀速率和低临界溶解温度(LCST)变化不大. 相似文献
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桑蚕丝素蛋白的结构、形态及其化学改性 总被引:4,自引:0,他引:4
通过对桑蚕吐丝机构的描述,着重从高分子科学的角度介绍桑蚕丝和蚕丝素蛋白大分子的组成、形态及各种化学、物理性质,讨论了蚕丝素蛋白的纤维化机理,并简述了丝索蛋白纤维的化学接枝改性及其应用。 相似文献
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April Reeves Laura A. Poole‐Warren Subhas C. Kundu Penny J. Martens 《Macromolecular bioscience》2012,12(3):322-332
Sericin peptides and PVA are chemically modified with methacrylate groups to produce a covalent PVA/sericin hydrogel. Preservation of the sericin bioactivity following methacrylation is confirmed, and PVA/sericin hydrogels are fabricated for both B. mori and A. mylitta sericin. Cell adhesion studies confirm the preservation of sericin bioactivity post incorporation in PVA gels. PVA/A. mylitta gels are observed to facilitate cell adhesion to a significantly greater degree than PVA/B. mori gels. Overall, the incorporation of sericin does not alter the physical properties of the PVA hydrogels but does result in significantly improved cellular interaction, particularly from A. mylitta gels.
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The availability of natural substances able to fulfill the role of antioxidants in a physiologic environment is important for the development of therapies against diseases associated with excessive production of reactive oxygen species and ensuing oxidative stress. Antioxidant properties have been reported episodically for sericin, a proteinaceous constituent of the silk thread in the cocoons generated by the larvae of the Lepidoptera order. We investigated the sericin fractions isolated from the cocoons spun by the domesticated (Bombyx mori) silkworm. Three fractions were isolated and evaluated, including two peptidoid fractions, the crude sericin and the purified (dialyzed) sericin, and the non-peptidoid methanolic extract of the crude fraction. When subjected to Trolox equivalent antioxidant capacity (TEAC) assay, the extract showed much higher antioxidant capacity as compared to the crude or purified sericin fractions. The three fractions were also evaluated in cultures of murine retinal photoreceptor cells (661 W), a cell line that is highly susceptible to oxidants and is crucially involved in the retinopathies primarily caused by oxidative stress. The extract displayed a significant dose-dependent protective effect on the cultured cells exposed to hydrogen peroxide. In identical conditions, the crude sericin showed a certain level of antioxidative activity at a higher concentration, while the purified sericin did not show any activity. We concluded that the non-peptidoid components accompanying sericin were chiefly responsible for the previously reported antioxidant capacity associated with sericin fractions, a conclusion supported by the qualitative detection of flavonoids in the extract but not in the purified sericin fraction. 相似文献
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T. Tanaka J. Magoshi Y. Magoshi B. Lotz S.-I. Inoue M. Kobayashi H. Tsuda M. A. Becker Zh. Han Sh. Nakamura 《Journal of Thermal Analysis and Calorimetry》2001,64(2):645-650
The crystal structure, thermal properties and growth rates of spherulites of the Tussah silk fibroin, produced upon drying
of the silk taken directly from the lumen which is essentially a poly(L-alanine)polypeptide, are investigated. Depending on casting conditions, spherulites with either αhelical chain conformation
or β parallel sheet structure are produced. The growth rates display a strong positive temperature coefficient, with an apparent
transition, which however cannot be related with the formation of two different crystal structures at this stage.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献