Abstract

QUANTIFICATION OF VITAMIN C BY TITRIMETRIC METHOD IN DIFFERENT MARKETED FRUIT JUICES

K. Bhavya Sri*, G. Srija and M. Sumakanth

Abstract

In this experiment, the content of ascorbic acid present in various marketed beverages was determined. This vitamin c content in different samples was determined using titration method of analysis. The titrations carried out in this experiment were iodometric titrations. Iodometric titration is a type of redox titration where we observe blueblack color formation due to the complex formed between iodine and starch after the whole analyte is consumed which is known to be the end point. Here, in this experiment after all the ascorbic acid (vitamin C) is oxidized to dehydroascorbic acid and the iodine forms the complex with the starch which is being used as the indicator in the iodometric titrations. Four different marketed beverages with the label contains vitamin c were taken as samples to perform the experiment. The standard ascorbic acid was also taken in the experiment. The amount of vitamin C in various chosen marketed beverages preparations were found to be as 2.59μg/ml, 37.8μg/ml, 59.57μg/ml and 30.044μg/ml in sample1, sample2, sample3 and sample4 respectively.

Keywords: Ascorbic acid, Redox titration, Iodometry titration.