Deduction of a facile method to construct Antheraea mylitta silk fibroin/gelatin blend films for prospective biomedical applications

Blend films of two types (I and II) were prepared by mixing Antheraea mylitta silk fibroin (AMF) and gelatin solution in various blend ratios via the solution casting method. Two different crosslinkers, namely glutaraldehyde and genipin, were used during blend preparation. The structural characteristics and thermal properties of the blend films were examined by Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), Thermogravimetric analysis (TGA) and Diffrential scanning calorimetery (DSC). The FTIR spectra showed conformational alterations in type I blend films while type II films attained high β‐sheet crystallinity. The XRD diffractograms presented a high degree of crystallinity in type II blend films compared to type I, which showed an almost amorphous structure. Further, thermal and biological studies were conducted on type II films. According to the TGA thermograms, the degradation temperature of the crosslinked blend films shifted compared to pure gelatin and pure AMF films. Partial miscibility of the two components was indicated by DSC thermograms of the blends. The high water uptake capacity of type II blend films was found to imitate hydrogel behaviour. The blend films did not show any toxicity in 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyl tetrazolium bromide (MTT) assay and supported L929 fibroblast cell spreading and proliferation. The biodegradation of the blend films was significantly faster than the pure silk film. © 2020 Society of Industrial Chemistry     

绚丽多彩的楚汉丝织品（之二）──色彩与纹饰

湖南出土的楚汉丝织品，以马王堆一、三号汉墓所出为代表，其色彩反映了我国当时印染工艺技术所达到的高度水平，其纹饰则显示了鲜明的时代特征，表现了运动、气势和古拙的艺术风格，充满着神奇浪漫的色彩。     

玉米须单体成分纯化及类别鉴定

以玉米须浸膏为原料,采用萃取和液相制备色谱相结合的办法分离得到高纯度玉米须黄酮单体,并优化出纯化工艺。     

The variability and interdependence of spider drag line tensile properties

There is considerable interest in producing fibres that mimic the impressive tensile properties of spider drag line silk. It must, however, be recognised that these properties have been assessed largely on the basis of their average values; there can be significant variability about these averages. The natural variability can also serve as a useful indicator of the range of values over which particular properties of biomimetic silk may be tailored. Here we quantify several tensile properties of drag line from Argiope trifasciata spiders. We distinguish between two groups of properties on the basis of their statistical coefficient of variation. There is significantly greater scope for tailoring the viscoplastic hardening aspects of drag line, compared to the variability of the initial elastic response or the yield strength. We also consider whether elastic modulus, yield strength and viscoplastic hardening can be controlled independently of one another.     

真丝纬编织物的品种开发

真丝针织物的品种花色单调已严重影响和制约其扩大出口创汇及生产企业的经济效益及发展。认为主要是品种开发与市场需求脱节,未能掌握国际市场导向指导消费,以及生产技术素质和管理能力不足。文章提出了开发真丝纬编织物的基本原则和目前可行的开发品种。     

已二醇二丙烯酸酯对真丝的接枝改性研究

研究了用二醇二丙烯酸酯为接枝单体、过硫酸铵（APS）为引发剂对真丝的接枝共聚反应，分析了接枝率的影响素，并测试了改性真丝的主要应用性能。结果表明：乳液和乙醇/水为溶剂的2种体系都能在真丝上获得较高接枝率。对于乙醇/水体系v(乙醇）：v(H2O）=1:1，接枝单体20～30g/L,2%甲酸4ml，引发剂APS 0.5g/L,65～70℃接枝60min的接枝率高。改性后真丝的断裂强度、延伸度、吸湿性能都可获得改善，对酸、碱的溶解性提高，但染色性能提高不明显，对泛黄性改善一般。     

真丝绸产品的清洁生产与生态设计

通过对真丝绸整个产品生命过程的分析，对其进行了生命周期评价，说明了丝绸与其产地环境之间的联系和影响，尝试寻求两者之间的和谐关系，提出了清洁生产工艺的规划和各种行之有效的对策和措施，尝试了对环境友好的丝绸印染工艺的生态设计。     

蜘蛛丝力学性能的多变性

为进一步探索蜘蛛丝的成丝机理，研究了不同个体大小，不同生存方式，不同环境湿度的大腹圆蛛牵引丝的拉伸性能。结果表明，蜘蛛对其丝纤维的结构和性能具有自我调控能力，随着环境，自身条件，生存方式等成丝条件的变化，蜘蛛牵引丝的力学性能也会发生相应的变化。     

绢麻交织绸的研究与开发

采用83×2dtex(120N/2)绢丝纱和417dtex(24N/1)亚麻纱交织,生产国际市场流行的服装面料,分析总结了这一新产品的生产工艺与条件。     

负载活性组分的核壳结构纤维膜的制备及性能

采用同轴静电纺丝技术将蛛丝蛋白（Ss）和美洲大蠊提取物（PAE）分别负载于纳米纤维的壳层与核层。随着Ss的增加,纤维直径从350 nm降至280 nm,核层直径由120nm升至140 nm,壳层厚度由115 nm降至70 nm。Ss的加入使纳米纤维膜具有良好的机械性能和亲水性,纳米纤维膜的拉伸强度可达到4.31 MPa,溶胀率可达到150%,水蒸气透过率可达到1834 g/(m2?24h),水接触角减小到 32.7 ?。纳米纤维膜核壳结构能够有效抑制药物突释,实现药物长效释放,7天内药物释放可达77%;纳米纤维膜能够有效抑制细菌生长,促进细胞增殖,相较于未负载Ss的纳米纤维膜,负载20%Ss的纤维膜的细胞增殖效果提高25%,说明Ss和PAE在伤口愈合过程中能够起到协同作用。