Detail of "296-41-3"

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Voltammetric determination of para-aminobenzoic acid using carbon paste electrode modified with macrocyclic compounds

All Rights Reserved. Voltammetric determination of para-aminobenzoic acid using carbon paste electrode modified with macrocyclic compounds. Kotkar, Rahul M.; Srivastava, Ashwini K. (Department of Chemistry, University of Mumbai, Mumbai 400098, India). Sensors and Actuators, B: Chemical, B119(2), 524-530 (English) 2006 Elsevier B.V. CODEN: SABCEB.Some commonly used reagents like 150-13-0 and 296-41-3 are used in this experiment. ISSN: 0925-4005. DOCUMENT TYPE: Journal CA Section: 80 (Organic Analytical Chemistry) The voltammetric behavior of para-aminobenzoic acid (PABA) was studied at a C paste electrode and the electrodes modified with six-member macrocyclic compds. The electrodes so formed were able to bind para-aminobenzoic acid ions chem. and gave better voltammetric responses than the unmodified ones. The macrocycles used as modifiers for the electrode prepn. were 18-crown-6, dibenzo-18-crown-6 and 1,4,7,10,13,16-hexathiacyclooctadecane. Among these three six-membered macrocyclic modified electrodes, dibenzo-18-crown-6 showed more affinity towards PABA and a 1.5-fold increase in voltammetric signal was obtained. This increase in anodic peak current was then used for finding the linear working range, which was 0.4-500 mg cm-3 with a detection limit of 0.1 mg cm-3 by differential pulse voltammetry. Interference from other vitamins like thiamine hydrochloride (B1), riboflavin (B2), nicotinamide (B3), pyridoxine hydrochloride (B6) and ascorbic acid (Vitamin C) was also studied. The modified electrode could be used for the simultaneous detn. of riboflavin, ascorbic acid and PABA. It also was used for the anal. of PABA in pharmaceutical, dry yeast and cultural ext. of spirulina samples. .