Author: Ogoke Toochukwu Jude
Department: Applied Biochemistry
Affiliation: Nnamdi Azikiwe University Awka

Pleurotus species of mushrooms are sources of food all over the world and are known to have nutritional value. Daedaleopsis confragosa (a non-edible mushroom), belongs to the polypore family. In consideration of the fact that D. confragosa belongs to this large and significant group of mushrooms together with the fact that the field of polypore mushrooms is unexplored and less used, this work was done to determine the proximate composition, mineral composition and the amino acid profile of Daedaleopsis confragosa, Pleurotus ostreatus and Pleurotus pulmonarius mushrooms which are indigenous to Southern Nigeria. The proximate analysis was carried out according to the method prescribed by AOAC while the mineral analysis was performed with AAS. The Amino acid analysis was done using Technicon Sequential Multiple sample Amino acid Analyser.The proximate analysis (in percentage) showed that the carbohydrate, crude protein, crude fibre, moisture, ash and fat were 23.30, 15.05, 24.50, 24.50, 10.00 and 2.65 for P. ostreatus; 34.38, 14.30, 19.50, 21.58, 7.25 and 3.00 for P. pulmonarius and 24.20, 13.55, 26.75, 21.50, 11.75 and 2.25 for D. confragosa respectively.The result of the mineral analysis (in ppm), indicated that sodium, potassium, magnesium, calcium, iron, copper and zinc were 2.944, 3.241, 18.934, 44.695, 8.265, 2.540 and 2.289 for P. ostreatus; 103.96, nil, 19.206, 46.519 10,160, 0.085 and 2.429 for P. pulmonarius and 4.432, 16.431, 18.076, 44.825, 20.093, 0.128 and 0.459 for D. confragosa respectively. Seventeen amino acids (except glutamine, asparagine and tryptophan) were detected. The percentage content of the nonessential amino acids for P. ostreatus ,P. pulmonarius and D. confragosa were 58.97, 58.40 and 56.09 respectively while that for the essential amino acids were 41.03, 41.60 and 43.91 respectively. The result revealed that the Pleurotus species contained appreciable amount of nutrients (especially protein and carbohydrate), minerals and amino acids. Comparing the results of the mushrooms showed that there was a significant increase (p<0.05) in the carbohydrate content of P. pulmonarius compared to D. confragosa and P. ostreatus;and the crude protein of P. ostreatuscompared to P. pulmonariusandD. confragosa. Significant increase (p0.05) observed in the amino acid composition of the mushrooms, indicating that the mushrooms were all rich in amino acids and could be explored as a source of amino acids both for nutritional and industrial purposes.

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