A finger-jointing model for describing ultrastructures of cellulose microfibrils

Abstract In this paper, we propose a finger-jointing model to describe the possible ultrastructures of cellulose microfibrils based on new observations obtained through heating of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized cellulose nanofibrils (CNFs) in saturated water vapor. We heated t...

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Autores principales:	Bunshi Fugetsu, Vipin Adavan Kiliyankil, Shoichi Takiguchi, Ichiro Sakata, Morinobu Endo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c88515638ae1441fb15ccf7aed7a2b07
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spelling	oai:doaj.org-article:c88515638ae1441fb15ccf7aed7a2b072021-12-02T15:55:04ZA finger-jointing model for describing ultrastructures of cellulose microfibrils10.1038/s41598-021-89435-62045-2322https://doaj.org/article/c88515638ae1441fb15ccf7aed7a2b072021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89435-6https://doaj.org/toc/2045-2322Abstract In this paper, we propose a finger-jointing model to describe the possible ultrastructures of cellulose microfibrils based on new observations obtained through heating of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized cellulose nanofibrils (CNFs) in saturated water vapor. We heated the micrometers-long TEMPO-CNFs in saturated water vapor (≥ 120 °C, ≥ 0.2 MPa) and observed a surprising fact that the long TEMPO-CNFs unzipped into short (100 s of nanometers long) fibers. We characterized the heated TEMPO-CNFs using X-ray diffraction (XRD) and observed the XRD patterns were in consistent with Iβ. We observed also jointed ultrastructures on the heated TEMPO-CNFs via high-resolution transmission electron microscopy (HR-TEM). Thus we concluded that cellulose microfibrils are not seamlessly long structures, but serial jointed structures of shorter blocks. Polysaccharide chains of the short blocks organized in Iβ. The jointed region can be either Iα or amorphous, depending on positions and distances among the chains jointed in proximity. Under heating, Iα was not converted into Iβ but was simply destroyed. The jointed structure implies a “working and resting rhythm” in the biosynthesis of cellulose.Bunshi FugetsuVipin Adavan KiliyankilShoichi TakiguchiIchiro SakataMorinobu EndoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bunshi Fugetsu Vipin Adavan Kiliyankil Shoichi Takiguchi Ichiro Sakata Morinobu Endo A finger-jointing model for describing ultrastructures of cellulose microfibrils
description	Abstract In this paper, we propose a finger-jointing model to describe the possible ultrastructures of cellulose microfibrils based on new observations obtained through heating of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized cellulose nanofibrils (CNFs) in saturated water vapor. We heated the micrometers-long TEMPO-CNFs in saturated water vapor (≥ 120 °C, ≥ 0.2 MPa) and observed a surprising fact that the long TEMPO-CNFs unzipped into short (100 s of nanometers long) fibers. We characterized the heated TEMPO-CNFs using X-ray diffraction (XRD) and observed the XRD patterns were in consistent with Iβ. We observed also jointed ultrastructures on the heated TEMPO-CNFs via high-resolution transmission electron microscopy (HR-TEM). Thus we concluded that cellulose microfibrils are not seamlessly long structures, but serial jointed structures of shorter blocks. Polysaccharide chains of the short blocks organized in Iβ. The jointed region can be either Iα or amorphous, depending on positions and distances among the chains jointed in proximity. Under heating, Iα was not converted into Iβ but was simply destroyed. The jointed structure implies a “working and resting rhythm” in the biosynthesis of cellulose.
format	article
author	Bunshi Fugetsu Vipin Adavan Kiliyankil Shoichi Takiguchi Ichiro Sakata Morinobu Endo
author_facet	Bunshi Fugetsu Vipin Adavan Kiliyankil Shoichi Takiguchi Ichiro Sakata Morinobu Endo
author_sort	Bunshi Fugetsu
title	A finger-jointing model for describing ultrastructures of cellulose microfibrils
title_short	A finger-jointing model for describing ultrastructures of cellulose microfibrils
title_full	A finger-jointing model for describing ultrastructures of cellulose microfibrils
title_fullStr	A finger-jointing model for describing ultrastructures of cellulose microfibrils
title_full_unstemmed	A finger-jointing model for describing ultrastructures of cellulose microfibrils
title_sort	finger-jointing model for describing ultrastructures of cellulose microfibrils
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c88515638ae1441fb15ccf7aed7a2b07
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A finger-jointing model for describing ultrastructures of cellulose microfibrils

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