Journal of Food, Agriculture and Environment

Responses of antinutritional factors in whole leaves of Pterocarpus santalinoides to Aspergillus niger


Aloysius Ausaji Ayuk, Eustace Avemere Iyayi, Josephine Oluwatoyin Ayuk, Bassey Igri Okon, Magnus Izah Anya, Pascal Ogar Ozung, Adekola Muyiwa Ogungbesan

Recieved Date: 2020-10-22, Accepted Date: 2020-12-22


The influence of Aspergillus niger on the comparative levels of tannins, saponins, phytic acid and oxalate in whole leaves of Pterocarpus santalinoides (PS) by solid-substrate fermentation was investigated. One kg of autoclaved whole leaf samples were weighed into sterile nylon bags and allowed to cool before inoculation. Autoclaved cold samples were inoculated apiece with three days–old one loopful Aspergillus niger (AN) grown in 100 ml potato dextrose broth. The levels of anti-nutritional factors (ANFs) in the leaf substrate were estimated for the control (0) and after 7, 14, 21 and 28 days, respectively. Results showed that inoculation of the whole leaf samples of the PS with AN caused reductions in the ANFs. The percent decrease in tannins was highest (17.85%) while that of phytic acid was least (5.93%) after 7 days of fermentation. Although, the percent decreases for all the ANFs were highest after 28d fermentation; that of tannin was outstanding. Percentage reduction of ANFs in PS was 56.4, 32.0, 20.2 and 24.5% for tannins, saponins, phytic acid and oxalate, respectively, after 28 days. The crude protein in leaves of PS was significantly (P<0.05) increased up to day 21 beyond which no significant increase was observed. Ether extract values decreased from day zero to 28 days after fermentation. Similarly, the neutral detergent fibre (NDF) and acid detergent fibre (ADF) values were significantly (P<0.05) reduced after 28 days. The protein enrichment coupled with degradation of fibrous fractions (ADF and NDF) suggests improved nutritional value of the PS. The study concluded that the progressive significant (P<0.05) reductions observed in ANFs of Pterocarpus santalinoides with time, have shown the degrading ability of Aspergillus niger.


Antinutritional factors, biodegradation, fibre, fermentation, leaves

Journal: Journal of Food, Agriculture and Environment
Year: 2021
Volume: 19
Issue: 1
Category: Environment
Pages: 68-73

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