The macromolecular structures on nitinol surfaces were prepared by ECR microwave cold-plasma of tetraglyme conditions. The surface chemistry was characterized by high resolution ESCA. The results showed that th...The macromolecular structures on nitinol surfaces were prepared by ECR microwave cold-plasma of tetraglyme conditions. The surface chemistry was characterized by high resolution ESCA. The results showed that the modified nitinol surfaces were built up mainly of -CH2-CH2-O- linkages and were particularly effective in preventing platelet adhesion.展开更多
The synthesis and characterization of PEG-like macromolecular structures on Nit inol surface from tri (ethylene glycol) dimethyl-ether under ECR-cold-plasma conditions were discussed. It was demonstrated that based o...The synthesis and characterization of PEG-like macromolecular structures on Nit inol surface from tri (ethylene glycol) dimethyl-ether under ECR-cold-plasma conditions were discussed. It was demonstrated that based on high-resolution ES CA, ATR-FTIR and contact angle investigations, the deposited PEG-like layers a re composed mainly of -CH 2-CH 2-O- linkages. These structures have a relati vely low contact angle. Compared to the unmodified surfaces, the plasma-treated Nitinol surfaces are more hydrophilic. Plasma enhanced coatings of PEG-like la yers can prevent Ni ion from releasing, thereby improving the biocompatibility o f Nitinol.展开更多
本研究评估了冷等离子体(Cold plasma,CP)处理相较于传统酸热法促进豌豆分离蛋白(Pea protein isolate,PPI)淀粉样纤维形成的潜力,同时测定了PPI淀粉样纤维的ThT荧光强度、微观结构、分子结构、粒径分布、Zeta电位、表面疏水性、表面游...本研究评估了冷等离子体(Cold plasma,CP)处理相较于传统酸热法促进豌豆分离蛋白(Pea protein isolate,PPI)淀粉样纤维形成的潜力,同时测定了PPI淀粉样纤维的ThT荧光强度、微观结构、分子结构、粒径分布、Zeta电位、表面疏水性、表面游离巯基、游离巯基、总巯基和二硫键含量、乳化性及起泡性等指标的变化情况。结果表明,CP可显著促进PPI淀粉样纤维的形成。与传统酸热法形成的PPI淀粉样纤维(A-PF)相比,CP介导形成的PPI淀粉样纤维(CP-PF)表现出更高的ThT荧光强度和β-折叠相对含量,和更短的形成成熟纤维时间。加热60 min,与A-PF(219.84 nm)相比,CP-PF可形成更长的淀粉样纤维(961.35 nm)。疏水性、游离巯基和二硫键分析结果表明,疏水相互作用力和二硫键是驱动β-折叠结构自组装和有序堆叠形成CP-PF的主要驱动力。此外,纤维化显著改善了PPI的功能特性,A-PF和CP-PF的乳化性和起泡性显著提高。与A-PF相比,CPPF表现出更优的乳化性(提升9.1%)和起泡性(提升6.8%)。本研究证实CP是一种有效促进蛋白淀粉样纤维化,并改善其功能性的技术手段。展开更多
基金supported by the National Natural Science Foundation of China(NNSFC)(Grant No.19972071,50274065)subsidized by the Special Funds for Major State Basic Research Project("973"Project)(Grant No.2002CB412704)
文摘The macromolecular structures on nitinol surfaces were prepared by ECR microwave cold-plasma of tetraglyme conditions. The surface chemistry was characterized by high resolution ESCA. The results showed that the modified nitinol surfaces were built up mainly of -CH2-CH2-O- linkages and were particularly effective in preventing platelet adhesion.
基金Funded by the National Natural Science Foundation of China (No.1997207150274065) and the Special Funds for Major State Basic Research Project (No.2002CB412704)
文摘The synthesis and characterization of PEG-like macromolecular structures on Nit inol surface from tri (ethylene glycol) dimethyl-ether under ECR-cold-plasma conditions were discussed. It was demonstrated that based on high-resolution ES CA, ATR-FTIR and contact angle investigations, the deposited PEG-like layers a re composed mainly of -CH 2-CH 2-O- linkages. These structures have a relati vely low contact angle. Compared to the unmodified surfaces, the plasma-treated Nitinol surfaces are more hydrophilic. Plasma enhanced coatings of PEG-like la yers can prevent Ni ion from releasing, thereby improving the biocompatibility o f Nitinol.
