QUALITY ASSESSMENT OF DIFFERENT BRANDS OF MANGO JUICE AVAILABLE IN INDIAN MARKET FOR CARBOHYDRATES AND ACIDS (ASCORBIC ACID) BY CONVENTIONAL TITRATION METHOD

摘要

Fruits play an important role in human life because it provides valuable nutrients such as carbohydrates protein and fibres. Fruits are commercially processed to produce fruit juices, jams, jellies etc. Fruit juices sometime naturally contaminates with certain substances like carbohydrates, heavy metals etc. However, sometime manufacturer intentionally adds some substance like carbohydrates and acids to increase the life span of the products and vitamin C to increase product sale. Presence of carbohydrates and acid helps in the quality assessment of the fruit juices. Color tests mainly used for the identification of carbohydrates such as sugar, reducing sugar and invert sugar etc. Titration is a common laboratory method of quantitative/chemical analysis that can be used to determine the unknown concentration of a known reactant. In the present study, total six branded mango juice samples were collected from local market of Gandhinagar. Acid content, fruit content, reducing sugar, total reducing sugar and glucose: fructose ratio and vitamin C were analysed with titrimetric method and this were found in the range of 0.038 to 0.061 mg/ml, 9% to 17.25%, 2.6 to 50.5%, 6.764 to 125.4%, 0.997 to 1% and 0.214 to 1.546 mg/ml respectively.