Abstract
Nutrient density and flavonoid composition of Pleurotus ostreatus cultivated by three substrate organic supplementation techniques were investigated using standard methods. The nutrient density values of the macro and trace-minerals revealed that the three samples Avogardo seed supplementation (AVOS) Whole wheat supplementation (WWS) and Soyabean + Avogardo + Wheat + corn(SAWCS) were rich in copper, manganese, zinc, magnesium, iron, potassium and sodium respectively. SAWCS had the highest fibre nutrient density value (193.5), followed by WWS (173.3) and the least was AVOS (156.5) respectively. Vitamin nutrient density values highlighted that the three samples of the mushroom possessed adequate amount of vitamin B 2 , vitamin B 1 and niacinamide but the value of cyanocobalamin was very low (0.03) in all the samples.Gas chromatographic analysis showed that flavonoid fractions such as catechin, naringinin, rutin, resveratrol, myricetin, morin quercetin and kaempferol were not detected. The results presented in this study showed that substrate organic supplementation method improved the nutritional quality of the mushroom samples and suggest its possible adoption as a technique for enriching mushrooms for food, feed and medicinal formulations.
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