Analysis of Different Brands of Fruit Juice with Emphasis on their Sugar and Trace Metal Content
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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.
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References
Esminger, A.H., Konlade, J.E and Robinson, J.R.K. (1986). A Nutrition Encyclopedia. 1st edition, Pegus Press, Library of Congress Catalogue. 481p.
FAO (Food and Agricultural Organization) (1986). Manual of Food Quality Control. Food Analysis: Quality, Adulteration and Test of Identity (Sugar and Honey). Paper 14/8: 110-113.
FAO (Food and Agricultural Organisation) of the United Nations W.H.O Rome (1992). Joint FAO/WHO foods standards programme for fruit juices and related products. Codex Alimentarius Commission. Vol. 6. pp 1-5.
Jeanette, G.G (1983). The analytical approach. American Chemical Society Washington D.C pp 55-56.
Morris, J.R., Grandell, P.G. and Bates, R.P. (2001). Principles and practices of small and medium scale fruit juice processing. Food and Agricultural Organization of the United Nations. pp 3-20.
Pearson, D. (1981). Pearson’s Chemical Analysis of Food. 8th edition. Churchill Livington Edinburgh. 13th edition. pp 14, 143 and 253.
Sizer, C.E. and Balasubramaman, V.M. (1999). New convention processes for minimally processed foods. Food Technology. 53(10) 64-69.
Smith, G.F. (1993). The wet ashing of organic material employing hot concentration perchloric acid. The liquid free reaction. Anal Chem. Acta 5: 397-421.
SON (Standard Organization of Nigeria) (1997). Nigerian Industrial Standard. Standard for fruit juices. 2nd edition. Ikoyi, Lagos. pp 2-5.