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Top-down Approach to Produce Protein Functionalized and Highly Thermally Stable Cellulose Fibrils
Univ Chile, Fac Ciencias Fis & Matemat, Dept Ingn Quim Biotecnol & Mat, Lab Nanocelulosa & Biomat, Beauchef 851, Santiago, Chile..ORCID iD: 0000-0002-5535-5242
Univ Chile, Fac Ciencias Fis & Matemat, Dept Ingn Quim Biotecnol & Mat, Lab Nanocelulosa & Biomat, Beauchef 851, Santiago, Chile..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
Univ Chile, Fac Ciencias Fis & Matemat, Dept Ingn Quim Biotecnol & Mat, Lab Nanocelulosa & Biomat, Beauchef 851, Santiago, Chile..
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2018 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 19, no 8, p. 3549-3559Article in journal (Refereed) Published
Abstract [en]

Protein-functionalized cellulose fibrils, having various amounts of covalently bonded proteins at their surface, were successfully extracted from the tunic of Pyura chilensis tunicates using successive alkaline extractions. Pure cellulose fibrils were also obtained by further bleaching and were used as reference material. Extraction yields of protein-functionalized cellulose fibrils were within the range of 62-76% by weight based on the dry initial tunic powder. Fourier-transform infrared and Raman spectroscopy confirmed the preservation of residual protein at the surface of cellulose fibrils, which was then quantified by X-ray photoelectron spectroscopy. The protein-functionalized cellulose fibrils were found to have relatively high crystallinity and their cellulose I crystalline structure was preserved upon applying alkaline treatments. The extracted cellulosic materials were found to be constituted of fibrils having a ribbon-like morphology with widths ranging from 30 nm up to similar to 400 nm. These protein-functionalized cellulose fibrils were found to have outstanding thermal stability with one of them having onset and peak degradation temperatures of similar to 350 and 374 degrees C, respectively. These values were found to be 24 and 41 degrees C higher than for bleached cellulose.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 19, no 8, p. 3549-3559
National Category
Polymer Technologies
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URN: urn:nbn:se:kth:diva-234197DOI: 10.1021/acs.biomac.8b00831ISI: 000441852400037PubMedID: 30004673Scopus ID: 2-s2.0-85050017915OAI: oai:DiVA.org:kth-234197DiVA, id: diva2:1246479
Note

QC 20180907

Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2018-09-07Bibliographically approved

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Zhao, Yadong

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