International Journal of Applied Microbiology and Biotechnology Research
ISSN: 2053-1818
Vol. 1(2), pp. 7-15, August 2013
doi.org/10.33500/ijambr.2013.01.002



Bioactive, nutritional and heavy metal constituents of some edible mushrooms found in Abia State of Nigeria

Okwulehie I. C.* and Ogoke J. A.

Department of Plant Science and Biotechnology, Michael Okpara University of Agriculture, Umudike, P. M. B. 7267, Umuahia, Abia State, Nigeria.

*To whom correspondence should be addressed. E-mail: phylyke@yahoo.com.

Received 26 June, 2013; Received in revised form 17 July, 2013; Accepted 23 July, 2013.

Abstract


Key words:
Mushroom, Bioactive constituents, Phytochemicals.


The study was designed to study the phytochemical properties, mineral analysis, proximate analysis and heavy metals compositions of four edible and non-edible species of mushrooms (Cheimonophyllum candidissimus, Pleurotus sp., Russula sp. and Auricularia sp.). Results revealed that the bioactive constituents of the mushrooms were as follows; Alkaloids (0.12±0.02-1.01±03%), Tannins (0.44±0.09-1.38±0.6%), Phenols, (0.13±0.01-0.26±0.00%), Saponins (0.14±0.03-0.32±0.04%), Flavonoids (0.08±0.02-0.34±0.02%). The result of proximate composition indicated that the mushroom contained 5.17±0.06-12.28±0.16% protein, 0.16±0.02-0.67±0.02% fats, 1.06±0.03-8.49±0.03% fibre and 62.06±0.52-80.01±4.71% carbohydrate. The mineral compositions of the mushrooms were as follows, Calcium (81.49±2.32-.914±2.32 mg/100 g), Magnesium (8±1.39-24±2.40 mg/100 g), Potassium (64.54±0.43-164.54±1.23 mg/100 g), Sodium (9.47±0.12–30.97±0.16 mg/100 g) and Phosphorus (22.19±0.57-53.2±0.44 mg/100 g). Heavy metals concentration indicated Cadmium (0.7–0.94 ppm), Zinc (27.82–70.98 ppm), Lead (0.66–2.86 ppm) and Copper (1.8–22.32 ppm). The results obtained indicate that mushrooms are good sources of phytochemicals, proximate components and minerals needed for maintenance of good health, and can also be incorporated in the manufacturing of drugs. However, the heavy metals obtained from the mushrooms indicate that when consumed high quantity may cause liver or kidney damage; death may result.

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