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The molecular structural properties of amylopectins of Chunmabyeo(Japonica), Yongmunbyeo(Indica × Japonica) and Mahatma(Indica) rice were investigated. The intrinsic viscosity of Chunmabyeo, Yongmunbyeo and Mahatma amylopectin were 148.3 ㎖/g, 156.6 ㎖/g and 167.5 ㎖/g, and β-amylolysis limit(%) were 54.6, 55.4 and 52.9 respectively. Average unit chain length(CL￣) and average inner chain length(ICL￣) of Mahatma amylopectin were longer than other varieties. Elution profiles by Sephadex G-50 chromatography of debranched amylopectins with β-amylase showed two peaks (void volume, DP￣3) and the elution profiles of debranched amylopectins with pullulanase showed three peaks(void volume, DP￣35-45, DP￣10-20). The ratio of Peak III (DP￣10-20) to Peak II (DP￣35-45) of Chunmbyeo, Yongmunbyeo a nd Mahatma amylopectin were 3.9, 3.4 and 3.3, respectively.
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