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Main Article Content
Analysis of Different Brands of Fruit Juice with Emphasis on their Sugar and Trace Metal Content
Abstract
Ten brands of commercial fruit juice were analysed for pH, specific gravity, total solids, reducing sugar, total sugar, and metal contents. The sugar content was determined using the Lane and Eynon method, sodium and potassium were determined by flame photometry, calcium and magnesium by complexometric titration using EDTA, while the other metals were determined by atomic absorption spectrophotometry. The juices had a pH range of 1.80-3.40, specific gravity of 1.002-1.054, total solids of 0.68-12.49%, content of reducing sugar 0.34-8.25% and content of total sugar 0.54-10.69%. Other derived values were calcium (0.01-1.25ppm), magnesium (0.06-0.43ppm), sodium (0.84-3.11ppm), potassium (0.16-7.42ppm), copper (0.28-5.06ppm), zinc (0.01-0.10ppm), chromium (0.03-0.09ppm), manganese (0.11-6.96ppm), cobalt (0.01-0.06ppm), nickel (0.03-0.15ppm), iron (0.45-50ppm), cadmium (0.16-0.38ppm) and lead (0.11-0.33ppm). The Nigerian made fruit juices had higher amount of added sugar. The pineapple juice brand had very high concentration of iron and the presence of cadmium and lead in some of the samples is a clear case of contamination. However the contamination level cannot yet present health threat to the consumer.
Keywords: Fruit juice, Added sugar, Reducing sugar, Low level contamination, Trace metals
