Abstract
In this study raw and steamed Pleurotus ostreatus were dried and ground and fractionated by sieving into four granulometric classes (< 200µm, 200-250µm, 250-355µm and > 355µm) and unsieved powders. The combined steam cooking and sieving improved the content of total polyphenols (+ 59.45%), flavonoids (+ 76.47%), condensed tannins (+ 68.75%) and trace elements (+ 45.51% Fe, + 63.63% Cu, + 62.42% Mn, + 121.11% Zn, and + 53.52% Se) as well as in-vitro and in-vivo antioxidant activities in the finest fraction < 200µm compared to the raw powder. It was found that the intake at a dose of 250mg/kg body weight of the finest fractions of raw and steamed powders by the stressed rats had more of a hepatoprotective effect marked by a reduction in the level of transaminases ALAT and ASAT. This work opens a new approach for valuing edible mushrooms in the development of new food products with high antioxidant value.
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