Sample preparation
One hundred and eighty fruits were selected from mature mango fruits plucked from the same tree for the study. Selected fruits were uniform and undamaged with no visible symptoms of infection. Fruits were cleaned and randomly grouped into 3 groups (60 mangoes per group). Each group was subdivided into 3 subgroups (replicates) with each subgroup having 20 fruits. Fruits were allowed to ripen under room conditions (30-33oC). The first group (60 fruits) were analysed unripe, the second analysed half-ripe while the third was analysed fully-ripe. The procedure for determining the stage of ripening of mango fruits was used with slight modification [8]. Fruits were considered unripe when firm with no depression when thumb-pressed. Fully ripe fruits had strong perfume, and indented upon pressing with the thumb while half-ripe indented slightly. Five mango fruits per replicate of 20 were used for the analyses and another 10 used for chip production. This procedure was repeated for all