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Biomacromolecules. 2000 Winter;1(4):584-91.

Molecular weight, structure, and shape of oat (1-->3),(1-->4)-beta-D-glucan fractions obtained by enzymatic degradation with lichenase.

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Department of Food Science, Swedish University of Agricultural Sciences, P.O. Box 7051, SE-750 07 Uppsala, Sweden.


Oat beta-glucan was partially degraded by lichenase for different periods of time. Weight-average molecular weights were obtained from SEC-RI-RALLS-Visc and ranged from 5300 to 257,200. Weight-average intrinsic viscosities ranged from 7 to 160 mL/g. The determined viscosity equation, [eta] = 5.47 x 10(-3) M 0.82, indicated an extended coil conformation. When the coil was modeled as a wormlike chain a persistent length of 2.30 nm was obtained. 1H and 13C NMR spectroscopy were used to identify the structural units in the partially degraded beta-glucan. The identification of the disaccharide laminaribiose in the hydrolysates may suggest the presence of a new structural feature in cereal beta-glucan.

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