以熔体流动指数为每10 min 40g的聚丙烯(PP)为原料,以稀土长余辉蓄光型夜光粉和原液着色颜料为添加剂,采用独特的分散技术,使夜光粉和颜料与PP基体充分混合均匀;以添加夜光粉质量分数5%的PP为皮层,颜料质量分数1%的PP为芯层,通过皮芯复...以熔体流动指数为每10 min 40g的聚丙烯(PP)为原料,以稀土长余辉蓄光型夜光粉和原液着色颜料为添加剂,采用独特的分散技术,使夜光粉和颜料与PP基体充分混合均匀;以添加夜光粉质量分数5%的PP为皮层,颜料质量分数1%的PP为芯层,通过皮芯复合纺丝,纺制彩色夜光PP纤维,探讨了其纺丝工艺条件。结果表明:当夜光粉粒径小于等于4μm,皮芯质量比40∶60,纺丝温度230℃,拉伸倍数4.0时,纺丝顺利,纤维性能较好;纺制的167 dtex/24 f彩色夜光PP纤维夜光效果达到吸光15 min,持续发光肉眼可见超过10 h,纤维的力学性能达到丙纶拉伸丝一等品标准。展开更多
Enzyme-catalytic fluorescence determination of artemisinin (qinghaosu, QHS) was developed using pyronine B (PB) as substrate of horseradish peroxidase (HRP). The interaction between HRP and QHS was an enzyme-substrate...Enzyme-catalytic fluorescence determination of artemisinin (qinghaosu, QHS) was developed using pyronine B (PB) as substrate of horseradish peroxidase (HRP). The interaction between HRP and QHS was an enzyme-substrate model. The catalytic characteristic of HRP in the oxidation reaction, in which the fluorescence of PB was decreased in the presence of QHS, was studied. The steady-state catalytic rate depended upon enzyme and substrate concentrations, and the Michaelis-Menten parameters Km, Vmax and Kcat were 8.4×10?5 mol · L?1, 7.4×10?6 mol · L?1 s?1 and 50.23 s?1. The catalytic activity of enzyme was inhibited in the presence of deactivated agents and at high temperature, respectively. Under optimum conditions, linear relationship between fluo-rescence intensity change (F0?F) of pyronine B and concen-tration of QHS was in the range of 1.41×10?7―1.27×10?6 mol · L?1. The detection limit (3σ) was determined to be 2.7×10?8 mol · L?1. The proposed method was applied to the concentration determination of QHS in the media of plasma or urine samples.展开更多
基金This work Was supported by the National Natural Science Foundation of China(Grant No.20075012)the Scientific Research Foundation of Hunan Educational Committee(Grant No.02C313).
文摘Enzyme-catalytic fluorescence determination of artemisinin (qinghaosu, QHS) was developed using pyronine B (PB) as substrate of horseradish peroxidase (HRP). The interaction between HRP and QHS was an enzyme-substrate model. The catalytic characteristic of HRP in the oxidation reaction, in which the fluorescence of PB was decreased in the presence of QHS, was studied. The steady-state catalytic rate depended upon enzyme and substrate concentrations, and the Michaelis-Menten parameters Km, Vmax and Kcat were 8.4×10?5 mol · L?1, 7.4×10?6 mol · L?1 s?1 and 50.23 s?1. The catalytic activity of enzyme was inhibited in the presence of deactivated agents and at high temperature, respectively. Under optimum conditions, linear relationship between fluo-rescence intensity change (F0?F) of pyronine B and concen-tration of QHS was in the range of 1.41×10?7―1.27×10?6 mol · L?1. The detection limit (3σ) was determined to be 2.7×10?8 mol · L?1. The proposed method was applied to the concentration determination of QHS in the media of plasma or urine samples.
文摘TB96 95010013 标准荧光亮度检测仪及其检定装置的研制=Developmentof the standard fluorophotometerand its calibration apparatus[刊,中]/孙鼎文,薛风仪(中国计量科学研究院)//无损检测.—1994, 16(7).
