Determination of ascorbic acid in the multivitamin by differential pulse anodic stripping voltammetric technique at a glassy carbon electrode / Siti Norbaitina Shaari

Shaari, Siti Norbaitina (2017) Determination of ascorbic acid in the multivitamin by differential pulse anodic stripping voltammetric technique at a glassy carbon electrode / Siti Norbaitina Shaari. Student Project. Faculty of Applied Sciences, Jengka, Pahang. (Unpublished)

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Abstract

Ascorbic acid cannot be synthesized by humans. This vitamin is rich in the varieties of vegetables and fruits. Nowadays, ascorbic acid has been transformed into multivitamin tablet which well-known as the dietary supplement. Growth in number of multivitamin tablet production increases curiosity among the researcher whether the content of ascorbic acid in the multivitamins dosage are in accordance with the standards and are safe to use by consumer. The differential pulse anodic stripping voltammetry (DPASV) technique using glassy carbon electrode (GCE) as the working electrode and phosphate buffer at pH 4.2 as the supporting electrolyte has been proposed to be developed. The experimental voltammetric parameters were optimized in order to obtain a maximum response with analytical validation of the technique. The optimum instrumental conditions for electroanalytical determination of ascorbic acid by the proposed DPASV technique were initial potential (Ei) = 0 V, final potential (Ef) = 0.7 V, accumulation time (tacc) = 60 s, scan rate (v) = 0.125 VIs, accumulation potential (Eacc) = 0 V and pulse amplitude = 0.150 V. The curve was linear from 5 mg/L to 300 mg/L (R2=0.999) with detection limit of 0.25 mg/L. The precisions in terms of relative standard deviation (RSD) were 1.3%,0.5% and 0.06%, respectively on the same day precision. The recoveries achieved for ascorbic acid

Item Type: Monograph (Student Project)
Creators:
CreatorsEmail
Shaari, Siti NorbaitinaUNSPECIFIED
Subjects: Q Science > QD Chemistry > Analytical chemistry
Divisions: Universiti Teknologi MARA, Pahang > Jengka Campus > Faculty of Applied Sciences (C)
Item ID: 24053
Uncontrolled Keywords: Ascorbic acid, Multivitamin, Dietary supplement, Differential pulse anodic stripping voltammetry
Last Modified: 06 May 2019 06:55
Depositing User: Perpustakaan Al-Bukhari UiTM Cawangan Pahang
URI: http://ir.uitm.edu.my/id/eprint/24053

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