Author : Ajala A.S 1
Date of Publication :22nd October 2021
Abstract: Plantain (Musa paradisiaca) peels are the major waste from plantain fruits, constituting about 40% of the fruits but are presently not utilized in Nigeria. Hence, there is need for its utilization. In this study, conversion of plantain peels to citric acid was evaluated. Plantain peels was cut into about 5mm thickness and dried in a tunnel dryer at temperatures of 60 o C. The dried peels were then grinded into about 0.1mm particle size and hydrolysed with HCl solution and enzyme Amylase to get reducing sugar and then inoculated with A. niger to get citric acid. The parameters of experiments to get reducing sugar were acid concentration (0.5-1.5 %), enzyme concentration, (7-10%), hydrolysis time (5-30 min), temperature (50-100 o C) and substrate concentration (15-25%). The parameters of experiment to get citric acid were inoculum concentration (7-11%), fermentation time (0-4 days), temperature (27-39oC), and ethanol concentration (1.0-4%). The results of lowest and highest values of reducing sugar in acid hydrolysed samples were 4.9 and 6.6 g/l, respectively, while the results of lowest and highest values of reducing sugars using enzyme hydrolysis were 5.62 and 7.73 g/l, respectfully. The lowest and highest values of citric acid recorded were 45.7 and 64.33%, respectfully. The findings of this study suggest that waste from plantain peels contain fermentable sugars that can be used as a source of raw material for citric acid production
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