title: Structure and physicochemical properties of starches from kidney bean seeds at immature, premature and mature stages of development.
abstract: Starches from kidney bean (Phaseolus vulgaris L. cv. Toramame) seeds at the immature, premature, mature stages of development were examined. The starch content increased from 94, 219 to 265 mg per seed. Starches showed the C(a)-crystalline type composed of small (<5 micrometer) and large (10-35 micrometer) granules, with the large granules largely increasing with maturity. The amylose content increased from 21, 26 to 27%, and rapid viscograms and DSC thermograms suggested that the mature-stage starch was gelatinized with ease. The amylose increased in size from DPn 820, 1000 to 1080 and a number of chains per molecule (NC) from 3.3, 4.2 to 4.5. The branched amylose was a minor component (11-18% by mole) with NC 20-22. The amylopectin was similar in CL (23), beta-amylolysis limit (59%), and chain-length distribution, but reduced in size (DPn 17,100-5270) and increased in content of phosphorus (114-174 ppm) with an increase in the amount of phosphorus linked to C-6 of the glucose residue (8-66%).
authors.affiliation: Department of Biochemical Science and Technology, Faculty of Agriculture, Kagoshima University, 890-0065, Kagoshima, Japan.
authors.forename: Hironori
authors.initials: H
authors.lastname: Yoshida
authors.forename: Koichi
authors.initials: K
authors.lastname: Nozaki
authors.forename: Isao
authors.initials: I
authors.lastname: Hanashiro
authors.forename: Fumio
authors.initials: F
authors.lastname: Yagi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ito
authors.forename: Mamoru
authors.initials: M
authors.lastname: Honma
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Matsui
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Takeda
mesh_terms: D008855:Microscopy, Electron, Scanning; D027805:Phaseolus / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry* / Q000254:growth & development; D013213:Starch / Q000737:chemistry*
chemical_list: D013213:Starch