Glycosides spin-lattice relaxation times

Spin-lattice relaxation time (T ) measurements have been employed in the charac-terizatioh of the resonances of paeoniflorin (43), a monoterpene bridgehead 0-p-glycoside isolated from the roots of Paeonia albiflora Pallas. In compounds... 

The second topic reviewed is a quantitative analysis of DD MAS NMR spectra of native celluloses. The resonant lines of Cl, C4 and C6 carbon species for these samples are deconvolved into the crystalline and non-crystalline components using the difference in the spin-lattice relaxation time between both components. The chemical shifts of these lines are determined separately for the both components of samples, and correlated to the torsion angles (f and ip about -1,4-glycosidic linkage and x> about the exocyclic C5-C6 bond, respectively. On the basis of these results, the characteristic chain conformations of the crystalline and non-crystalline components of native and regenerative cellulose are discussed. 

---