Electrochemical oxidation of caffeic acid in the presence of 1,4-benzenediboronic acid: CEC mechanism and glucose effect on the complex formation

2019 ◽  
Vol 17 (4) ◽  
pp. 935-942 ◽  
Author(s):  
Hadi Beiginejad ◽  
Zeinab Rafiee ◽  
Mohammad Moradi
Keyword(s):  
Complex Formation ◽  
Caffeic Acid ◽  
Electrochemical Oxidation ◽  
Glucose Effect

The fortuitous direct electrochemical synthesis of some copper(I) complexes

1981 ◽  
Vol 59 (1) ◽  
pp. 62-64 ◽  
Author(s):  
Farouq F. Said ◽  
Dennis G. Tuck
Keyword(s):  
Complex Formation ◽  
Current Efficiency ◽  
Electrochemical Oxidation ◽  
Electrochemical Synthesis ◽  
Solution Chemistry ◽  
Formation Processes ◽  
Halide Complexes

The electrochemical oxidation of copper in the presence of RX (R = CH3, C6H5, C6H5CH2; X = Cl, Br, I, not all combinations) and either 2,2′-bipyridine or (C2H5)4NX gives rise to neutral or anionic copper(I) halide complexes. The current efficiency shows that CuX is produced at the anode; the subsequent solution chemistry influences the complex formation processes.

Comparative Labelling and Biokinetic Studies of 99mTc-EDTA(Sn) and 99mTc-DTPA(Sn)

1977 ◽  
Vol 16 (01) ◽  
pp. 30-35 ◽  
Author(s):  
N. Agha ◽  
R. B. R. Persson
Keyword(s):  
Complex Formation ◽  
Significant Influence ◽  
Room Temperature ◽  
Ph Value ◽  
Maximum Activity ◽  
Reduction Step ◽  
Labelling Yield ◽  
Different Temperatures ◽  
Kinetics Of

SummaryGelchromatography column scanning has been used to study the fractions of 99mTc-pertechnetate, 99mTcchelate and reduced hydrolyzed 99mTc in preparations of 99mTc-EDTA(Sn) and 99mTc-DTPA(Sn). The labelling yield of 99mTc-EDTA(Sn) chelate was as high as 90—95% when 100 μmol EDTA · H4 and 0.5 (Amol SnCl2 was incubated with 10 ml 99mTceluate for 30—60 min at room temperature. The study of the influence of the pH-value on the fraction of 99mTc-EDTA shows that pH 2.8—2.9 gave the best labelling yield. In a comparative study of the labelling kinetics of 99mTc-EDTA(Sn) and 99mTc- DTPA(Sn) at different temperatures (7, 22 and 37°C), no significant influence on the reduction step was found. The rate constant for complex formation, however, increased more rapidly with increased temperature for 99mTc-DTPA(Sn). At room temperature only a few minutes was required to achieve a high labelling yield with 99mTc-DTPA(Sn) whereas about 60 min was required for 99mTc-EDTA(Sn). Comparative biokinetic studies in rabbits showed that the maximum activity in kidneys is achieved after 12 min with 99mTc-EDTA(Sn) but already after 6 min with 99mTc-DTPA(Sn). The long-term disappearance of 99mTc-DTPA(Sn) from the kidneys is about five times faster than that for 99mTc-EDTA(Sn).

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