Department of Molecular Biology and Biotechnology

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Browsing Department of Molecular Biology and Biotechnology by Author "Cuff, Joyce M."

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    Cultivation of Three Types of Indigenous Wild Edible Mushrooms: Coprinus Cinereus, Pleurotus Flabellatus and Volvariella Volvocea on Composted Sisal Decortications Residue in Tanzania
    (2008) Mshandete, Anthony M.; Cuff, Joyce M.
    The periods for spawn running, pinhead and fruit body formation, number of flushes, yield and biological efficiency of the three Tanzanian wild edible mushrooms, Coprinus cinereus, Pleurotus flabellatus and Volvariella volvocea, grown on composted sisal decortications residue were studied. Results revealed that the organic ingredients in sisal decortications residue composted well within 21 days of composting, resulting in the formation of suitable compost, to support the growth of mycelia of the three edible mushrooms. The time for the first appearance of mushrooms was shortest for C. cinereus (10-11 days), followed by V. volvaceae (12-14 days), while that for P. flabellatus was 16-18 days. All three mushrooms produced at least five flushes; flush 1 gave the highest yield while flush 5 the lowest yield. The biological efficiency (B.E.) for C. cinereus, P. flabellatus and V. volvaceae was 68, 64 and 28%, respectively. Significant differences (P<0.05) in mushroom size, yield and % B.E. of the three mushrooms species were recorded. The results also showed that the B.E. (74%) of P. flabellatus grown on non-composted sisal decortications residue was significantly higher (P<0.05) than that grown on composted sisal decortications residue. The implications of this study are that sisal decortications residue could be used to cultivate very protein rich mushrooms for food while at the same time promoting environmental sustainability.
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    Proximate and Nutrient Composition of Three Types of Indigenous Edible Wild Mushrooms Grown In Tanzania and Their Utilization Prospects
    (2008) Mshandete, Anthony M.; Cuff, Joyce M.
    In Tanzania wild edible mushrooms collected during the rainy season have broad cultural acceptance and constitute a traditionally very important nutritious food. However, their assessment as food, which is based on their chemical analysis, has not been adequately studied and documented. The objective of the study was to determine the proximate nutritive potential of three indigenous edible wild mushrooms namely Coprinus cinereus, (Schaeff) S. Gray s.lat., Pleurotus flabellatus, (Berk and Br.) Sacc. and Volvariella volvaceae (Bull.ex.Fr) Singer, grown on composted solid sisal decortication residues. Standard procedures were used to determine the proximate chemical composition of dried samples of domesticated indigenous edible wild mushrooms. Atomic absorption spectrophotometry was used to determine the mineral element composition. The results were compared using an analysis of variance test. There were significant differences in the proximate nutritive values of the three edible mushrooms (p>0.05). Despite differences in the chemical composition of the three indigenous edible mushroom species, the overall nutritional potential of the three mushroom species was quite good. Furthermore, the overall results indicated that the fruit bodies of the three native mushrooms studied have nutrient qualities similar to other cultivated exotic edible mushrooms, and a higher protein content than many cereals and vegetables. The results on a dry weight basis demonstrated significant amounts of protein, vitamin C and minerals, ranging from 17-28 %, 33-55 mg/100g and 5.2-3232 mg/100g, respectively. Furthermore crude fibre ranged between 6.6-11 % and carbohydrate, at 50-62 %, both of which were found to be relatively high. All three species were low in fat content, with a range of 1 to 3.3 %, and energy value (calculated), 302-313 kcal/100g. These results indicated that the studied mushrooms have good nutritive value for human beings. The fact that the domesticated mushrooms were grown using locally adapted biotechnology increases the likelihood of their incorporation in the diet as a food item contributing protein, vitamin C and mineral nutrients. The high crude fibre and low fat content are also important from a nutritional perspective. The researchers believe that it would be appropriate to popularise the utilization of the three mushrooms as unconventional protein rich food sources to supplement the traditional cereal Tanzanian based diet, aimed at combating the problem of protein malnutrition in Tanzania in particular and in developing counties in general.