Nutritional composition of some edible wild mushrooms

Soon, Jan Mei (2005) Nutritional composition of some edible wild mushrooms. Universiti Malaysia Sabah. (Unpublished)

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Abstract

he objectives of this study were to determine the nutritional value of some edible wild mushrooms of Sabah such as Amauroderma perplexum, Coltricia cinnamomea, Ganoderma applanatum, Pleurotus sp. 1 (kulat bulu), Pleurotus sp. 2 (kulat putih) and cultivated mushroom, Lentinus edodes. The determination of the proximate composition includes moisture, ash, crude fat, crude fiber, crude protein, and carbohydrate contents. Minerals analysis were carried out for macrominerals such as sodium, potassium, calcium and magnesium contents while the trace elements like ferum, copper, zinc and manganese were analysed as well using atomic absorption spectrophotometer. Water-soluble vitamins such as thiamine and vitamin C content of the edible wild mushrooms were measured as well. In addition, the total phenolic contents, expressed as mg gallic acid equivalent/g of dry mushroom were extracted using three solvents which includes methanol ethanol and ethyl acetate. Screening of the antioxidative activity across the edible wild mushrooms were carried out using the scavenging effects against 2,2-diphenyl-1-picrylhydrazyl radicals method and the β-carotene bleaching method. Kulat putih contributes as one of the highest source of energy compared to the rest of the edible wild mushrooms. In fact, kulat putih was significantly (p <0.05) higher in carbohydrates content compared to the rest of the mushrooms. Potassium were the most abundant mineral among the mushrooms while sodium content ranked the lowest among the mushrooms. In addition, kulat putih was found out to be the richest source of potassium with a concentration of 1467.92 + 98.90 mg potassium/100g. Meanwhile, both the ferum and copper content of the edible wild mushrooms were determined as the most abundant and the least trace mineral among the mushrooms respectively. Kulat bulu was the richest source of ferum with an average amount of 4146.91 + 853.02 mg/kg. Copper ranged from below detection limits for both A. perplexum and Pleurotus sp. 2 to 157.45 + 34.20 mg copper/kg in Pleurotus sp. 1. Thiamine ranged from 0.06-1.46 mg/g while vitamin C were from 0.09-2.22 mg/g in the local mushrooms. The total phenolic contents of these mushrooms ranged from 0.04-0.18 mg gallic acid equivalent!g of dry mushroom in the methanolic mushroom extracts. While both the ethanolic and ethyl acetate extracts contained 0.09-0.21 mg GAEs/g and 0.02-0.22 mg GAEs/g of dry mushroom. Kulat putih exhibited the best antioxidative activity since it was able to scavenge the most DPPH radical and inhibits the bleaching rate of the β-carotene effectively. This research revealed that some of the edible wild mushrooms in Sabah had nutrioonal potential value and intense efforts could be geared towards further investigation.

Item Type: Academic Exercise
Uncontrolled Keywords: nutrition, wild mushroom, cultivated mushroom, moisture, ash, crude fat, crude fiber, crude protein, carbohydrate
Subjects: T Technology > TX Home economics > Nutrition. Foods and food supply
Divisions: SCHOOL > School of Food Science and Nutrition
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 10 Jun 2013 06:30
Last Modified: 16 Oct 2017 06:27
URI: http://eprints.ums.edu.my/id/eprint/6218

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