The interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA has been studied by UV-Vis spectral, Fluorescence spectral in buffer solution of Tris-HCl (pH=7.25) using Neutral Red (NR) as a probe. The intercalati...The interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA has been studied by UV-Vis spectral, Fluorescence spectral in buffer solution of Tris-HCl (pH=7.25) using Neutral Red (NR) as a probe. The intercalation and electrostatic manner are confirmed to be the two major modes for interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA. The balance constant of Sm(Ⅲ)(MTB)2 rare earth metal complex and Herring Sperm DNA is K=4.10 × 104 L·mol-1. The results indicate that biological functions of Herring Sperm DNA are changed to a certain extend due to the interaction between Sm(Ⅲ)(MTB)2 rare earth metal complex and Herring Sperm DNA.展开更多
A new catalytic spectrophotometric method for determing trace arsenium has been proposed.The method is based on the catalytic effect of As(V) in discoloring reaction between KIO 3 and Thymol Blue in HCl medium (pH=0.8...A new catalytic spectrophotometric method for determing trace arsenium has been proposed.The method is based on the catalytic effect of As(V) in discoloring reaction between KIO 3 and Thymol Blue in HCl medium (pH=0.8) and the presence of activator citric acid.The method has good selectivity and the linear range is 0.00~10.00μg/L,detection limit is 6.3×10 -11 g/ml.The method has been used for the determination of trace arsenium in celery,human hair and waste water samples,and RSD is 2.1%~3.2% and recovery is 97%~102%.展开更多
文摘The interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA has been studied by UV-Vis spectral, Fluorescence spectral in buffer solution of Tris-HCl (pH=7.25) using Neutral Red (NR) as a probe. The intercalation and electrostatic manner are confirmed to be the two major modes for interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA. The balance constant of Sm(Ⅲ)(MTB)2 rare earth metal complex and Herring Sperm DNA is K=4.10 × 104 L·mol-1. The results indicate that biological functions of Herring Sperm DNA are changed to a certain extend due to the interaction between Sm(Ⅲ)(MTB)2 rare earth metal complex and Herring Sperm DNA.
文摘A new catalytic spectrophotometric method for determing trace arsenium has been proposed.The method is based on the catalytic effect of As(V) in discoloring reaction between KIO 3 and Thymol Blue in HCl medium (pH=0.8) and the presence of activator citric acid.The method has good selectivity and the linear range is 0.00~10.00μg/L,detection limit is 6.3×10 -11 g/ml.The method has been used for the determination of trace arsenium in celery,human hair and waste water samples,and RSD is 2.1%~3.2% and recovery is 97%~102%.