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Fruit Waste to Energy through Open Fermentation
University of Sindh, Jamshoro, Pakistan.
University of Sindh, Jamshoro, Pakistan.
National University of Sciences and Technology, Islamabad, Pakistan.
Donghua University, Shanghai, China.
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2017 (English)In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 142, p. 904-909Article in journal (Refereed) Published
Abstract [en]

This study aims to examine the nonsterilized fermentation conditions for coproduction of pectinases and lipase enzymes using several fruit wastes as an energy source. Thermophilic fungal strain, Penicillium expansum CMI 39671 was used as a fermenting strain. The effect of process conditions including; nitrogen sources, pH, temperature, time and moisture contents, on the production of both enzymes were studied. The highest activities of pectinase and lipase (2817, 1870 U/g dry substrate) enzymes were found with orange peel feedstock, whereas the lowest activities of 1662 U/g and 1266 U/g were found with banana peel and papaya peel feedstocks respectively. Overall, pectinase showed higher enzymatic activities than lipase enzymes, both having similar increasing and decreasing trends, at all studied conditions. The optimum process conditions of peptone as a nitrogen source, pH 7, 40°C, 5 days and 70% moisture contents, were found to show highest enzymatic activities for both enzymes. The orange peel feedstock showed no significant difference in both enzymes’ activities at sterilized and nonnotarized process conditions. Pectinase and lipase enzymes showed (13791 U/g) and (8114 U/g) for sterilized and (14091 U/g) and (8324 U/g) for nonnotarized process conditions respectively. In addition, the fungal strains also produce bacteriocin-like compounds that could inhibit microbial growth. These findings will help to design and develop robust, cost-effective and less energy intensive enzyme production processes and consequently an efficient fruit waste to energy system through open fermentation.

Place, publisher, year, edition, pages
Elsevier Ltd , 2017. Vol. 142, p. 904-909
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-38735DOI: 10.1016/j.egypro.2017.12.145Scopus ID: 2-s2.0-85041504945OAI: oai:DiVA.org:mdh-38735DiVA, id: diva2:1185208
Available from: 2018-02-23 Created: 2018-02-23 Last updated: 2018-02-23Bibliographically approved

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Naqvi, Muhammad

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