NO· and ·O2-combine each other to form peroxynitrite (ONOO-) in vivo. Peroxynitrite is very cytotoxic, and it damages many biomolecules. 3-nitrotyrosine and dityrosine are two main products from the reaction...NO· and ·O2-combine each other to form peroxynitrite (ONOO-) in vivo. Peroxynitrite is very cytotoxic, and it damages many biomolecules. 3-nitrotyrosine and dityrosine are two main products from the reaction of ONOO-and tyrosine. Lots of metallic ions in vivo influence the modification of tyrosine by peroxynitrite. UV-Vis and Fluorescence spectrophotometer were used to study the catalysis and inhibition of metallic ions on the production of 3-nitrotyrosine and dityrosine in vitro. Present results showed that Co?髤, Cu?髤 and Mn?髤 enhance the production of 3-nitrotyrosine, and among them Co?髤 and Mn?髤 have been reported rarely before about it. In addition, Mn?髤 inhibits the production of dityrosine to a certain extent.展开更多
硝酸盐含量常用于判断水体质量和受污染程度,是重要的水质检测指标。以玻碳电极为基底电极、聚3,4-乙烯二氧噻吩(PEDOT)为固态接触层、聚氯乙烯(PVC)为敏感基膜制备了一种新型全固态硝酸根离子选择性电极,并考察了该电极的电化学特性。...硝酸盐含量常用于判断水体质量和受污染程度,是重要的水质检测指标。以玻碳电极为基底电极、聚3,4-乙烯二氧噻吩(PEDOT)为固态接触层、聚氯乙烯(PVC)为敏感基膜制备了一种新型全固态硝酸根离子选择性电极,并考察了该电极的电化学特性。结果表明,以PEDOT为固态接触层能有效促进电极离子—电子之间信号传导,提高电极的稳定性。该电极在1×10^(-1)~1×10^(-5)mol/L范围内的硝酸铵溶液中呈良好的能斯特响应,响应斜率可达53.7 m V/dec,响应时间在50 s以内。该电极的重现性、选择性好,使用寿命超过3个月。展开更多
文摘NO· and ·O2-combine each other to form peroxynitrite (ONOO-) in vivo. Peroxynitrite is very cytotoxic, and it damages many biomolecules. 3-nitrotyrosine and dityrosine are two main products from the reaction of ONOO-and tyrosine. Lots of metallic ions in vivo influence the modification of tyrosine by peroxynitrite. UV-Vis and Fluorescence spectrophotometer were used to study the catalysis and inhibition of metallic ions on the production of 3-nitrotyrosine and dityrosine in vitro. Present results showed that Co?髤, Cu?髤 and Mn?髤 enhance the production of 3-nitrotyrosine, and among them Co?髤 and Mn?髤 have been reported rarely before about it. In addition, Mn?髤 inhibits the production of dityrosine to a certain extent.
文摘硝酸盐含量常用于判断水体质量和受污染程度,是重要的水质检测指标。以玻碳电极为基底电极、聚3,4-乙烯二氧噻吩(PEDOT)为固态接触层、聚氯乙烯(PVC)为敏感基膜制备了一种新型全固态硝酸根离子选择性电极,并考察了该电极的电化学特性。结果表明,以PEDOT为固态接触层能有效促进电极离子—电子之间信号传导,提高电极的稳定性。该电极在1×10^(-1)~1×10^(-5)mol/L范围内的硝酸铵溶液中呈良好的能斯特响应,响应斜率可达53.7 m V/dec,响应时间在50 s以内。该电极的重现性、选择性好,使用寿命超过3个月。
