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International Journal of Plant Biology
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  • International Journal of Plant Biology is published by MDPI from Volume 13 Issue 1 (2022). Previous articles were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence, and they are hosted by MDPI on mdpi.com as a courtesy and upon agreement with PAGEPress.
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20 January 2010

Orange and Pineapple Wastes as Potential Substrates for Citric Acid Production

,
and
1
Bells University of Technology, P.M.B.1015, Ota 112104, Ogun State, Nigeria
2
Federal Institute of Industrial Research, Oshodi 102215, Lagos State, Nigeria
3
Department of Botany and Microbiology, University of Ibadan, Ibadan 200132, Oyo State, Nigeria
*
Author to whom correspondence should be addressed.
Int. J. Plant Biol.2010, 1(1), e4;https://doi.org/10.4081/pb.2010.e4
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Abstract

Orange (pulp) and pineapple wastes were used as substrates for citric acid production by two strains of Aspergillus niger. A. niger strains NRRL 567 and 328 produced the maximum amount of citric acid (57.6% and 55.4%, respectively) at a moisture content of 38.9% in orange waste and the highest yields of 46.4% and 45.4% citric acid in pineapple waste at moisture contents of 54.4% and 63.4 %, respectively. The addition of 1–3% methanol to the substrates resulted in reduction in yield in both cases.

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