Faster magic angle spinning reveals cellulose conformations in woods. Issue 34 (13th April 2021)

• Record Type: Journal Article
• Authors: Yuan, Eric Chung-Yueh; Huang, Shing-Jong; Huang, Hung-Chia; Sinkkonen, Jari; Oss, Andres; Org, Mai-Liis; Samoson, Ago; Tai, Hwan-Ching; Chan, Jerry Chun Chung
• Is Part Of: Chemical communications. Volume 57:Issue 34(2021)
• Page Start: 4110
• Page End: 4113
• Publication Date: 2021-04-13
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/d1cc01149a
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : Magic angle spinning in the regime of 150 kHz provides an unprecedented opportunity to characterize wood structure by 1 H-detected NMR. The map of 1 H - 13 C chemical shift correlations allows a clear distinction of the tg, gt, and gg conformers of C6 in spruce. Abstract : We present a first report on the detection of three different C6 conformers of cellulose in spruce, as revealed by solid-state 1 H– 13 C correlation spectra. The breakthrough in 1 H resolution is achieved by magic-angle spinning in the regime of 150 kHz. The suppression of dense dipolar network of 1 H provides inverse detected 13 C spectra at a good sensitivity even in natural samples. We find that the glycosidic linkages are initially more ordered in spruce than maple, but a thermal treatment of spruce leads to a more heterogeneous packing order of the remaining cellulose fibrils.