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Process optimization for citrus waste biorefinery via simultaneous pectin extraction and pretreatment.
University of Borås, Faculty of Textiles, Engineering and Business. (Resource Recovery)
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2017 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 12, no 1, p. 1706-1722Article in journal (Refereed) Published
Abstract [en]

In a novel valorization approach for simultaneous pectin extn. and pretreatment (SPEP) of citrus waste (CW) by dil. nitric acid and ethanol, almost all of the CW was converted to bio-derived chems. in a singlestep process at a low/moderate temp. The SPEP was performed at different temps. (70 °C and 80 °C), pH (1.8, 3.0, and 4.3), and extn. times (2 h and 3 h) with a full factorial design. The max. pectin yield of 45.5% was obtained at pH 1.8, 80 °C, and 2 h. The pectin yields at pH 1.8 were much higher than at pH 4.3 and 3. Also, the degree of methyl-esterification at pH 1.8 was higher than 50%, whereas at the higher pH, low methoxyl pectins were extd. The treated CW obtained after the SPEP, free from limonene, was subjected to sep. cellulolytic enzymic hydrolysis and ethanolic fermn. The glucose yields in the enzymic hydrolyzates were higher for the CW treated at pH 1.8. The fermn. of the enzymic hydrolyzates by Mucor indicus resulted in fungal biomass yields in the range of 355 to 687 mg per g of consumed sugars. The optimum conditions for obtaining the max. SPEP yield (glucose + pectin (g) / raw material (g)*100) were pH 1.8, 80 °C, and 2 h, which resulted in a yield of 58.7% (g/g CW). [on SciFinder(R)]

Place, publisher, year, edition, pages
North Carolina State University, Dep. of Wood and Paper Science , 2017. Vol. 12, no 1, p. 1706-1722
Keywords [en]
Citrus waste, Dilute-acid, Enzymatic hydrolysis, Ethanol, Fermentation, Full factorial design, Fungal biomass, Limonene, Mucor indicus, Pectin, Pretreatment
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:hb:diva-12532DOI: 10.15376/biores.12.1.1706-1722ISI: 000397065200123Scopus ID: 2-s2.0-85028313752OAI: oai:DiVA.org:hb-12532DiVA, id: diva2:1136291
Available from: 2017-08-27 Created: 2017-08-27 Last updated: 2017-10-23Bibliographically approved

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Lundin, MagnusTaherzadeh, Mohammad JZamani, Akram

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