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As part of an effort to solve the problem of post harvest losses of fruits, physicochemical characteristics of four mango varieties (Palmer, Amelioree, Mango and Keitt) were determined at two ripening stages. Their suitability for jam processing was also evaluated based on viscosity measurements. The pulps of pre-ripe mangoes were highly acidic (pH: 3.50 – 3.85), rich in starch (4.4 – 11.1 % w/w) as well as in dry matter. They contained less soluble sugars (4.04 – 7.56 g/100 g) and recorded lower viscosity values than those of the ripe mangoes. The pre-ripe Palmer and Amelioree mango varieties had high dry matter content, while the Mango and Amelioree varieties had higher soluble sugars contents. Due to their higher starch contents, all the jams prepared with pre-ripe mangoes were more viscous than the ripe mango preparations. Ripe Palmer and Amelioree varieties were the best for jam processing, based on their viscosity values. These results could help to improve the quality of mango jams. Key words : Mango, proximate analysis, ripening stage, jam processing. African Journal of Biotechnology Vol.2(9) 2003: 301-306

Effect of ripening on the composition and the suitability for jam processing of different varieties of mango (Mangifera indica)