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Cell wall-associated transition metals improve alkaline-oxidative pretreatment in diverse hardwoods
DOE-Great Lakes Bioenergy Research Center, Michigan State University, East Lansing.
DOE-Great Lakes Bioenergy Research Center, Michigan State University, East Lansing.
University of Georgia, Complex Carbohydrate Research Center, University of Georgia, Athens, GA.
DOE-Great Lakes Bioenergy Research Center, Michigan State University, East Lansing.
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2016 (English)In: Green Chemistry, ISSN 1463-9262, E-ISSN 1463-9270, Vol. 18, no 5, p. 1405-1415Article in journal (Refereed) Published
Abstract [en]

The responses of four diverse hardwoods (hybrid poplar, silver birch, hybrid aspen, and sugar maple) to alkaline hydrogen peroxide (AHP) pretreated at ambient temperature and pressure were analyzed to gain a deeper understanding of the cell wall properties that contribute to differences in enzymatic hydrolysis efficacy following alkaline-oxidative pretreatment. The enzymatic hydrolysis yields of these diverse hardwoods increased significantly with increasing the cell wall-associated, redox-active transition metal content. These increases in hydrolysis yields were directly correlated with improved delignification. Furthermore, we demonstrated that these improvements in hydrolysis yields could be achieved either through elevated levels of naturally-occurring metals, namely Cu, Fe, and Mn, or by the addition of a homogeneous transition metal catalyst (e.g. Cu 2,2′-bipyridine complexes) capable of penetrating into the cell wall matrix. Removal of naturally-occurring cell wall-associated transition metals by chelation resulted in substantial decreases in the hydrolysis yields following AHP pretreatment, while re-addition of metals in the form of Cu 2,2′-bipyridine complexes and to a limited extent Fe 2,2′-bipyridine complexes prior to pretreatment restored the improved hydrolysis yields. Glycome profiles showed improved extractability of xylan, xyloglucan, and pectin epitopes with increasing hydrolysis yields for the diverse hardwoods subjected to the alkaline-oxidative pretreatment, demonstrating that the strength of association between cell wall matrix polymers decreased as a consequence of improved delignification

Place, publisher, year, edition, pages
2016. Vol. 18, no 5, p. 1405-1415
National Category
Bioprocess Technology
Research subject
Biochemical Process Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-12317DOI: 10.1039/c5gc01748cISI: 000371608100029Scopus ID: 2-s2.0-84959304247Local ID: b6f4dbbf-abd8-48bf-94fa-b2af4b82a839OAI: oai:DiVA.org:ltu-12317DiVA, id: diva2:985267
Note
Validerad; 2016; Nivå 2; 20160311 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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