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
该文以冬枣为试材,对其进行不同时间(0、5、10 min)的低温等离子体处理,通过测量处理后冬枣的微生物数量、品质相关指标和采用顶空气相色谱离子迁移谱(headspace gas chromatography ion migration spectrometry,HS-GC-IMS)测量其风味...该文以冬枣为试材,对其进行不同时间(0、5、10 min)的低温等离子体处理,通过测量处理后冬枣的微生物数量、品质相关指标和采用顶空气相色谱离子迁移谱(headspace gas chromatography ion migration spectrometry,HS-GC-IMS)测量其风味物质的变化,探究低温等离子体处理对冬枣贮藏品质和风味物质变化的影响。结果表明,与CK组相比,低温等离子体处理对冬枣表面菌落总数、霉菌和酵母菌总数具有显著的抑制作用,其中70 d时,10 min处理组和5 min处理分别比CK组菌落总数低0.6 lg CFU/g和0.39 lg CFU/g;分别比CK组霉菌和酵母菌总数低0.42 lg CFU/g和0.28 lg CFU/g。低温等离子体处理可以减缓冬枣呼吸强度的升高,缓解可溶性糖含量、可滴定酸含量和维生素C含量的下降;抑制冬枣硬度的降低,其中,5 min处理组效果最为显著,冬枣硬度在第70天时5 min处理组比CK组升高47%;5 min处理组冬枣中原果胶含量比CK组高43%,可溶性果胶含量比CK组低55%,纤维素含量和半纤维素含量也分别比CK组高14%和74%。HS-GC-IMS结果分析表明,贮藏后期5 min处理组中2,3-丁二酮、2-苯基乙醛、柠檬烯、己酸等物质含量高于CK组和10 min处理组,但处理组中2,3-丁二酮和2,5-二甲基吡嗪含量低于CK组。综合分析表明,低温等离子体处理对抑制采后冬枣品质劣变及风味物质变化具有积极作用。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.
文摘该文以冬枣为试材,对其进行不同时间(0、5、10 min)的低温等离子体处理,通过测量处理后冬枣的微生物数量、品质相关指标和采用顶空气相色谱离子迁移谱(headspace gas chromatography ion migration spectrometry,HS-GC-IMS)测量其风味物质的变化,探究低温等离子体处理对冬枣贮藏品质和风味物质变化的影响。结果表明,与CK组相比,低温等离子体处理对冬枣表面菌落总数、霉菌和酵母菌总数具有显著的抑制作用,其中70 d时,10 min处理组和5 min处理分别比CK组菌落总数低0.6 lg CFU/g和0.39 lg CFU/g;分别比CK组霉菌和酵母菌总数低0.42 lg CFU/g和0.28 lg CFU/g。低温等离子体处理可以减缓冬枣呼吸强度的升高,缓解可溶性糖含量、可滴定酸含量和维生素C含量的下降;抑制冬枣硬度的降低,其中,5 min处理组效果最为显著,冬枣硬度在第70天时5 min处理组比CK组升高47%;5 min处理组冬枣中原果胶含量比CK组高43%,可溶性果胶含量比CK组低55%,纤维素含量和半纤维素含量也分别比CK组高14%和74%。HS-GC-IMS结果分析表明,贮藏后期5 min处理组中2,3-丁二酮、2-苯基乙醛、柠檬烯、己酸等物质含量高于CK组和10 min处理组,但处理组中2,3-丁二酮和2,5-二甲基吡嗪含量低于CK组。综合分析表明,低温等离子体处理对抑制采后冬枣品质劣变及风味物质变化具有积极作用。
