As potassium bichromate can be reduced by 4-methysalicylic acid to chromium(III) which enhance the CL intensity of luminol-H2O2 system,a new chemiluminescence system for the determination of 4-methysalicylic acid has ...As potassium bichromate can be reduced by 4-methysalicylic acid to chromium(III) which enhance the CL intensity of luminol-H2O2 system,a new chemiluminescence system for the determination of 4-methysalicylic acid has been established.The relative CL intensity was correlated with salicylic acid concentration in the range 7.0×10-9～8.0×10-6 mol/L,and the detection limit was 1.0×10-9 mol/L.The relative standard deviation(n=8) for 4.0×10-7 mol/L 4-methysalicylic acid is 2.9%.The method has been applied to the determination of 4-methysalicylic acid in the bactericidal solutions with satisfactory results.展开更多
A novel chemiluminescence (CL) sensor for the determination of gallic acid combined with flow injection analysis was developed by electrostatically immobilizing luminol and periodate on anion-exchange resins respectiv...A novel chemiluminescence (CL) sensor for the determination of gallic acid combined with flow injection analysis was developed by electrostatically immobilizing luminol and periodate on anion-exchange resins respectively. Gallic acid was sensed by its enhancing effect on the weak CL reaction between luminol and periodate, which were eluted from the ion exchange column. The possible reaction mechanism of the CL system was suggested and discussed. The response of the sensor to gallic acid concentration was linear over the range of 8.0×10 -9-1.0×10 -6 mol/L with a detection limit of 6.5×10 -9 mol/L (3σ). The relative standard deviation (RSD) for 7 repetitive determinations of gallic acid (1.0×10 -7 mol/L) was 1.8%. The sensor could be used for over 400 times determination with a good reproducibility.展开更多
It was found that 20 amino acids could inhibit the intensity of the luminol-H_2O_2-CuSO_4 chemiluminescence system.Using this character,a rapid and sensitive method for the determination of 20 amino acids was develope...It was found that 20 amino acids could inhibit the intensity of the luminol-H_2O_2-CuSO_4 chemiluminescence system.Using this character,a rapid and sensitive method for the determination of 20 amino acids was developed with flow injection coupled with chemiluminescence detection.Under the optimal conditions,the detection limits of 20 amino acids were in the range of 4.5×10^（-7）- 4.3×10^（-10） mol/L,and the relative standard deviations were less than 3.2%.The proposed method was successfully applied to drug analysis.The possible mechanism was also discussed.展开更多
文摘As potassium bichromate can be reduced by 4-methysalicylic acid to chromium(III) which enhance the CL intensity of luminol-H2O2 system,a new chemiluminescence system for the determination of 4-methysalicylic acid has been established.The relative CL intensity was correlated with salicylic acid concentration in the range 7.0×10-9～8.0×10-6 mol/L,and the detection limit was 1.0×10-9 mol/L.The relative standard deviation(n=8) for 4.0×10-7 mol/L 4-methysalicylic acid is 2.9%.The method has been applied to the determination of 4-methysalicylic acid in the bactericidal solutions with satisfactory results.
文摘A novel chemiluminescence (CL) sensor for the determination of gallic acid combined with flow injection analysis was developed by electrostatically immobilizing luminol and periodate on anion-exchange resins respectively. Gallic acid was sensed by its enhancing effect on the weak CL reaction between luminol and periodate, which were eluted from the ion exchange column. The possible reaction mechanism of the CL system was suggested and discussed. The response of the sensor to gallic acid concentration was linear over the range of 8.0×10 -9-1.0×10 -6 mol/L with a detection limit of 6.5×10 -9 mol/L (3σ). The relative standard deviation (RSD) for 7 repetitive determinations of gallic acid (1.0×10 -7 mol/L) was 1.8%. The sensor could be used for over 400 times determination with a good reproducibility.
基金supported by the National Natural Science Foundation of China(No.20575056)Henan Innovation Project for University Research Talents(No.2005126)Natural Science Foundation of Henan Province of China (No.092300410122).
文摘It was found that 20 amino acids could inhibit the intensity of the luminol-H_2O_2-CuSO_4 chemiluminescence system.Using this character,a rapid and sensitive method for the determination of 20 amino acids was developed with flow injection coupled with chemiluminescence detection.Under the optimal conditions,the detection limits of 20 amino acids were in the range of 4.5×10^（-7）- 4.3×10^（-10） mol/L,and the relative standard deviations were less than 3.2%.The proposed method was successfully applied to drug analysis.The possible mechanism was also discussed.
