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Cellulose from the green macroalgae Ulva lactuca: isolation, characterization, optotracing, and production of cellulose nanofibrils

Cellulose (London), 2020, Vol.27 (7), p.3707-3725 [Peer Reviewed Journal]

The Author(s) 2020 ;The Author(s) 2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 0969-0239 ;ISSN: 1572-882X ;EISSN: 1572-882X ;DOI: 10.1007/s10570-020-03029-5

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Title:
Cellulose from the green macroalgae Ulva lactuca: isolation, characterization, optotracing, and production of cellulose nanofibrils
Author: Wahlström, Niklas ; Edlund, Ulrica ; Pavia, Henrik ; Toth, Gunilla ; Jaworski, Aleksander ; Pell, Andrew J. ; Choong, Ferdinand X. ; Shirani, Hamid ; Nilsson, K. Peter R. ; Richter-Dahlfors, Agneta
Subjects: Algae ; Biological Sciences ; Biologiska vetenskaper ; Bioorganic Chemistry ; cell-wall ; Cellulose ; Ceramics ; Chemistry ; Chemistry and Materials Science ; CNF ; Composites ; degradation ; Disintegration ; Emission spectra ; Ethanol ; Excitation spectra ; Extraction ; fenestrata ; Fiber- och polymervetenskap ; Fibre and Polymer Science ; Fluorescence ; Glass ; Glucan ; Hydrochloric acid ; Hydrogen peroxide ; Macroalgae ; Mapping ; Materials Science ; Medicin och hälsovetenskap ; Nanocellulose ; Natural Materials ; NMR ; Northern Hemisphere ; Nuclear magnetic resonance ; Optotracing ; Organic Chemistry ; Original Research ; packing analysis ; Physical Chemistry ; Polymer Science ; Polymer Sciences ; Polysaccharides ; Sodium hydroxide ; Sustainable Development ; Thermal stability ; Ulva ; Ulva fenestrata ; Ulva lactuca ; Xylose
Is Part Of: Cellulose (London), 2020, Vol.27 (7), p.3707-3725
Description: We report (1) successful extraction and characterization of cellulose from northern hemisphere green macroalgae Ulva lactuca ( Ulva fenestrata ) collected along the Swedish west coast and cultivated indoors under controlled conditions, followed by (2) its utilization in the production of lignin-free cellulose nanofibrils (CNF). Cellulose was extracted by sequential treatment with ethanol, hydrogen peroxide, sodium hydroxide, and hydrochloric acid, yielding a cellulose-rich insoluble fraction. The extracted cellulose was disintegrated into CNF using a mechanical homogenization process without any further enzymatic pre-treatments. In addition, regenerated cellulose was prepared. XRD characterization of the CNF showed characteristic peaks for the cellulose I allomorph and confirmed that the nanofibrils were semicrystalline with a crystallinity index of 48%. Regenerated cellulose was mostly amorphous with an XRD pattern indicating the presence of the cellulose II allomorph. The cellulose fractions were essentially free from inorganic substances and thermally stable up to around 260 °C. Structural mapping with CP-MAS 13 C-NMR sustains the cellulose content of CNF and regenerated cellulose, respectively, yet ion chromatography identified the presence of 10–15% xylose in the fractions. Optotracing was used as a novel and non-disruptive tool to selectively assess the polysaccharide composition of the cellulose fractions and produced CNF aiming to shed light on this hitherto non-resolved origin of xylose in Ulva cell wall matter. Fluorescence excitation and emission spectra of a panel of 4 oligothiophenes identified and verified the presence of cellulose and sustain the conclusion that the isolated fractions consist of cellulose intertwined with a small amount of a xylose-containing glucan copolymer. Graphic abstract
Publisher: Dordrecht: Springer Netherlands
Language: English
Identifier: ISSN: 0969-0239
ISSN: 1572-882X
EISSN: 1572-882X
DOI: 10.1007/s10570-020-03029-5
Source: SWEPUB Freely available online
Springer Nature OA/Free Journals
ProQuest Central

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Cellulose from the green macroalgae Ulva lactuca: isolation, characterization, optotracing, and production of cellulose nanofibrils

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