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Organic matter transformation and detoxification in dry olive mill residue by the saprophytic fungus Paecilomyces farinosus

Paper ID Volume ID Publish Year Pages File Format Full-Text
35236 45082 2009 10 PDF Available
Title
Organic matter transformation and detoxification in dry olive mill residue by the saprophytic fungus Paecilomyces farinosus
Abstract

Dry olive mill residue (DOR), the by-product of the two-phase extraction process, is very rich in organic matter and nutritionally relevant cations. For this reason, the agronomic use of this waste has been suggested although DOR exhibits significant phytotoxicity. The objective of this study was to investigate the impact of Paecilomyces farinosus on both organic matter modification and detoxification of this waste. Humification ratio in DOR colonized by the fungus for 20 weeks was increased by about 65% with respect to the abiotic control and humification index reached 0.38, a value that characterizes well-humified materials. High performance size-exclusion chromatography of humic acids from fungal cultures showed a marked increase in both weight-averaged and number-averaged molecular weights with respect to abiotic controls. Water-soluble phenols were reduced by 45% in 20-week-old P. farinosus cultures on DOR and mass-balance ultra-filtration showed that the relative abundance of the molecular weight fraction of phenols above 30 kDa increased from 31 to 72% suggesting the occurrence of polymerization. Experiments performed with alfalfa grown on soils containing 2.5% (w/w) of abiotic controls and fungal-treated DOR showed that phytotoxicity was totally suppressed in the waste that underwent fungal treatment.

Keywords
Dry olive mill residue; Phenols; Paecilomyces farinosus; Humification; Laccase; Phytotoxicity
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Organic matter transformation and detoxification in dry olive mill residue by the saprophytic fungus Paecilomyces farinosus
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 44, Issue 2, February 2009, Pages 216–225
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