VOLTAMETRIC DETERMINATION OF VITAMINE “C” CONTENT IN CABBAGE USING ANTHRAQUINONE MODIFIED CARBON PESTE ELECTRODE

AMARE, NIGUSIE

dc.contributor.author	AMARE, NIGUSIE
dc.date.accessioned	2018-11-07T05:14:27Z
dc.date.available	2018-11-07T05:14:27Z
dc.date.issued	2018-11-07
dc.identifier.uri	http://hdl.handle.net/123456789/9136
dc.description.abstract	Anodic stripping voltammetric determination of ascorbic acid using carbon paste electrode modified with anthraquinone is investigated in the present work. Electrochemical investigation of ascorbic acid using square wave voltammetry using the carbon paste electrode modified with anthraquinone was found to be very sensitive. Compared with the unmodified carbon paste electrode, the striping anthraquinone modified electrode remarkably increases the peak currents of ascorbic acid, and showed excellent catalytic activity for the oxidation of ascorbic acid. Cabbages cultivated from three different areas (Guld, Karishewa and Birbira) were used for investigation. Voltammetry responses of cabbage extracts of the two samples showed the presence of ascorbic acid whereas they can’t see the presence of ascorbic acid in one of the samples collected from Birbira. Optimization of different variables such as pH of working solution, scan rate and square wave parameters such as frequency, amplitude and step potential were made to improve the method efficiency during the experiment. It was found that the anodic peak current of AA is directly related to concentration and scan rate whereas the peak current increases up to pH 4 and decreases beyond pH 4.SWV was used to plot the calibration curve and a good linear relationship between anodic peak current and ascorbic acid concentration in the range 5x10 -5 to 4x10 -3 M, with the correlation coefficient to 0.99931. The application of the modified electrode for the determination of ascorbic acid in food formulation showed good recovery with reproducible results 86.5%. Keywords: stripping voltammetry, cyclic voltammetry, Square Wave Voltammetry, Anthraquinone, Modified Carbon Paste Electrode, Ascorbic acid	en_US
dc.language.iso	en	en_US
dc.subject	CHEMISTRY	en_US
dc.title	VOLTAMETRIC DETERMINATION OF VITAMINE “C” CONTENT IN CABBAGE USING ANTHRAQUINONE MODIFIED CARBON PESTE ELECTRODE	en_US
dc.type	Thesis	en_US