Effect of γ-ray irradiation on the structure of konjak glucomanan

In this paper, konjak glucomannan (KGM) was irradiated at dose of 1～8kGy.The effect of γ-irradiation on structure of KGM were studied by ultraviolet (UV) Spectroscopy, Fourier transorm infrared (FT-IR) spectroscopy, X-ray diffraction, nuclear magnetic resonance (NMR) .It showed that KGM underwent breakage of glycosidic bond on the long chain of molecules and viscosity decreased.But irradiated KGM was still pyranohexose and no new group was created.It caused the increase of the Carbonyl groups and decrease of the hydroxyl.The amorphous structure didn’t change significantly but its peak increases.D-spacing increased with the irradiation dose increased.