Faster magic angle spinning reveals cellulose conformations in woods
2021
Yuan, Eric Chung-Yueh | Huang, Shing-Jong | Huang, Hongjia | Sinkkonen, Jari | Oss, Andres | Org, Mai-Liis | Samoson, Ago | Tai, Hwan-Ching | Chan, Jerry Chun Chung
We present a first report on the detection of three different C6 conformers of cellulose in spruce, as revealed by solid-state ¹H–¹³C correlation spectra. The breakthrough in ¹H resolution is achieved by magic-angle spinning in the regime of 150 kHz. The suppression of dense dipolar network of ¹H provides inverse detected ¹³C 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.
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