Nutrient enrichment of pineapple waste using <i>Aspergillus niger</i> and <i>Trichoderma viride</i> by solid state fermentation

Abstract

The enrichment by microbial fermentation of agro industrial waste to alleviate their nutritional problems has been proposed but the nutritional value of the subsequent feed for animal consumption has not been fully elucidated. This study investigates whether solid state fermentation of pineapple waste using the fungi Aspergillus niger and Trichoderma viride could improve its nutrient content. Results show that fermentation of pineapple waste by solid state fermentation using the fungi A. niger and T. viride significantly (P < 0.05) enriches the nutrient content of the waste, particularly increasing the crude protein and ash content while lowering the crude fiber content. The most significant nutrient enrichment was recorded at 72 h of fermentation using A. niger and at 96 h of fermentation using T. viride. Indiscernible changes were noted in the mineral content of pineapple waste (PW). Dry matter increased significantly (P < 0.05) as fermentation progressed with the highest values recorded at 96 h. This study establishes no significant differences (P > 0.05) in the fermentation abilities of the two fungi, A. niger and T. viride. Fermented pineapple waste may be a potential supplement in compounding animal feed provided that it is acceptable and highly digestible.

Keywords: Agro industrial waste, crude fiber, crude protein.