| Abstract: | The long-range structure of konjac glucomannan(KGM) is studied by using laser light scatter(LLS), gel permeation chromatography (GPC) and method of viscostdity. The weight-average molecularweight (Mw), root-mean-square ratio of gyration (S2) 1/2 ], second viral coefficient (A2) and multi-dispersioncoefficient (Mw/Mn) are 1.04× 106, 105.0±-0. 9 nm, (- 1.59±0. 28) × 10-3 mol ml g-2 and 1. 015±0. 003,respectively. Mark-Houwink equation is established as η] = 5. 96 × 10-2Mw0.73 and the molecular chain pa-rameters are as follows: ML=982.82 nm-1 , Lp=27.93 nm, d=0.74 nm, h=0.26 nm, L=1 054.11 nm.Further more molecular chain morphology of KGM is studied by using atom force microscope (AFM) andtransmission electronic microscope (TEM), and the result shows that the KGM molecular is an extendingsemi-flexible linear chain without branch. Therefore, the image of molecular chain morphology confirms thededuction drawn by Mark-Houwink equation and molecular chain parameters. |
