title: Allomorph distribution and granule structure of lotus rhizome C-type starch during gelatinization.
abstract: The allomorph distribution and granule structure of C-type starch from lotus rhizomes were investigated using a combination of techniques during gelatinization. The disruption of crystallinity during gelatinization began from the end distant from the eccentric hilum and then propagated into the center of granule. The periphery of hilum end was finally gelatinized, accompanied by high swelling. The crystallinity changed from C-type to A-type via CA-type during gelatinization, and finally became amorphous structure. The amylose content, crystal degree, helix content, ratio of 1045/1022cm(-1), and peak intensity of crystalline lamellae of gelatinizing starch significantly decreased after 70°C. The amorphous content and ratio of 1022/995cm(-1) increased after 70°C. This study elucidated that B-type allomorph was mainly arranged in the distal region of eccentric hilum, A-type allomorph was mainly located in the periphery of hilum end, and the center of granule was a mixed distribution of A- and B-type allomorphs.
authors.affiliation: Key Laboratories of Crop Genetics and Physiology of the Jiangsu Province and Plant Functional Genomics of the Ministry of Education, Yangzhou University, Yangzhou 225009, China.
authors.forename: Canhui
authors.initials: C
authors.lastname: Cai
authors.forename: Jinwen
authors.initials: J
authors.lastname: Cai
authors.forename: Jianmin
authors.initials: J
authors.lastname: Man
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.forename: Zhifeng
authors.initials: Z
authors.lastname: Wang
authors.forename: Cunxu
authors.initials: C
authors.lastname: Wei
mesh_terms: D002236:Carbohydrate Conformation; D003460:Crystallization; D005780:Gelatin / Q000737:chemistry; D000070116:Lotus / Q000737:chemistry*; D027343:Rhizome / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*
chemical_list: D005780:Gelatin; D013213:Starch
keywords: (13)C CP/MAS NMR; (13)C cross-polarisation magic-angle spinning nuclear magnetic resonance; ATR-FTIR; Allomorph distribution; C-type starch; DSC; Gelatinization; Granule structure; Lotus rhizome; SAXS; SEM; X-ray powder diffraction; XRD; attenuated total reflectance-Fourier transform infrared; differential scanning calorimetry; scanning electron microscope; small-angle X-ray scattering