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Growth tolerance of Zygomycetes Mucor indicus in orange peel hydrolysate without detoxification

Paper ID Volume ID Publish Year Pages File Format Full-Text
34579 45034 2012 7 PDF Available
Title
Growth tolerance of Zygomycetes Mucor indicus in orange peel hydrolysate without detoxification
Abstract

The capability of two zygomycetes strains, Mucor indicus and an isolate from tempeh (Rhizopus sp.), to grow on orange peel hydrolysate and their tolerance to its antimicrobial activity, was investigated. Both fungi, in particular M. indicus, tolerated up to 2% d-limonene in semi-synthetic media during cultivation in shake flasks, under aerobic as well as anaerobic conditions. The tolerance of M. indicus was also tested in a bioreactor, giving rise to varying results in the presence of 2% limonene. Furthermore, both strains were capable of consuming galacturonic acid, the main monomer of pectin, under aerobic conditions when no other carbon source was present. The orange peel hydrolysate was based on 12% (dry w/v) orange peels, containing d-limonene at a concentration of 0.6% (v/v), which no other microorganism has been reported to be able to ferment. However, the hydrolysate was utilised by M. indicus under aerobic conditions, resulting in production of 410 and 400 mg ethanol/g hexoses and 57 and 75 mg fungal biomass/g sugars from cultivations in shake flasks and a bioreactor, respectively. Rhizopus sp., however, was slow to germinate aerobically, and neither of the zygomycetes was able to consistently germinate in orange peel hydrolysate, under anaerobic conditions. The zygomycetes strains used in the present study demonstrated a relatively high resistance to the antimicrobial compounds present in orange peel hydrolysate, and they were capable of producing ethanol and biomass in the presence of limonene, particularly when cultivated with air supply.

► The growth of two zygomycetes was investigated on unmodified orange peel hydrolysate. ► Both fungi tolerated up to 2% d-limonene in semi-synthetic media. ► The hydrolysate was utilised by Mucor indicus under aerobic conditions. ► M. indicus produced 400 mg ethanol/g hexoses from the hydrolysate in a bioreactor.

Keywords
Zygomycetes; Mucor indicus; Ethanol; Orange peel; d-Limonene
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Growth tolerance of Zygomycetes Mucor indicus in orange peel hydrolysate without detoxification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 47, Issue 5, May 2012, Pages 836–842
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us