Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Izhar A Ansari"'
Autor:
Muhammad Ali Sheraz, Waqar Hussain, Tehmina Ismail, Kiran Qadeer, Izhar A Ansari, Iqbal Ahmad, Saima Zahid
Publikováno v:
AAPS PharmSciTech. 15:1324-1333
The degradation kinetics of 5 × 10−5 M cyanocobalamin (B12) and hydroxocobalamin (B12b) in the presence of ascorbic acid (AH2) was studied in the pH range of 1.0–8.0. B12 is degraded to B12b which undergoes oxidation to corrin ring cleavage prod
Publikováno v:
International Journal of Pharmaceutics. 390:174-182
The present investigation is based on a study of the effect of buffer and non-buffer divalent anions (phosphate, sulphate, tartrate, succinate, malonate) on the kinetics, product distribution and photodegradation pathways of riboflavin (RF) at pH 6.0
Publikováno v:
International Journal of Pharmaceutics. 280:199-208
The kinetics of photolysis of aqueous riboflavin solutions on UV and visible irradiation has been studied in the pH range 1–12 using a specific multicomponent spectrophotometric method for the simultaneous determination of riboflavin and its major
Publikováno v:
Journal of Pharmaceutical and Biomedical Analysis. 31:369-374
The photolysis of cyanocobalamin by visible light in the presence of nicotinamide at pH 1.0-7.0 has been studied. The second-order rate constants for the bimolecular interaction of these vitamins have been determined which vary from 9.50 x 10(-3) (pH
Publikováno v:
Pakistan journal of pharmaceutical sciences. 17(2)
The UV and visible absorption characteristics of B and C vitamins have been studied in the pH range 2.0-7.0. The overlapping of the absorption bands of thiamine hydrochloride, nicotinamide, pyridoxine hydrochloride and ascorbic acid with cyanocobalam
Publikováno v:
Pakistan journal of pharmaceutical sciences. 17(1)
Aqueous cyanocobalamin solutions (pH 1-7) have been photolysed in the presence of individual B (thiamine HCl, riboflavin, nicotinamide and pyridoxine HCl) and C (ascorbic acid) vitamins with visible light. The degraded solutions were subjected to thi