title: Changes in physicochemical properties of waxy corn starches after harvest, and in mechanical properties of fresh cooked kernels during storage.
abstract: Changes in the physicochemical properties of waxy corn starches after harvest and in the mechanical properties of cooked fresh kernels during storage were investigated. Immature waxy corn ears from four genotypes were stored at ambient temperature, and starches were isolated from kernels removed at 0, 2, 4 and 6 days after harvest. Starch content in the kernels generally increased with storage time, and also significantly differed depending on the genotype. For all the days after harvest, medium granules had the highest contribution to the total starch volume, followed by small and large granules. The average chain length distribution of amylopectin increased in relation to storage time. Starches at harvesting state exhibited the lowest peak viscosity in all four genotypes, which increased relative to postharvest periods. Moreover, the average force behaviours of cooked kernels were greatly affected by storage times after cooking.
authors.affiliation: Department of Plant Science and Agricultural Resources, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand; Plant Breeding Research Center for Sustainable Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand.
authors.forename: Danupol
authors.initials: D
authors.lastname: Ketthaisong
authors.affiliation: Department of Plant Science and Agricultural Resources, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand; Plant Breeding Research Center for Sustainable Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand.
authors.forename: Bhalang
authors.initials: B
authors.lastname: Suriharn
authors.affiliation: Department of Food Technology, Faculty of Technology, Khon Kaen University, Khon Kaen 40002, Thailand.
authors.forename: Ratchada
authors.initials: R
authors.lastname: Tangwongchai
authors.affiliation: Department of Plant Science and Agricultural Resources, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand; Plant Breeding Research Center for Sustainable Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand. Electronic address: kamol9@gmail.com.
authors.forename: Kamol
authors.initials: K
authors.lastname: Lertrat
mesh_terms: D000687:Amylopectin / Q000737:chemistry*; D055598:Chemical Phenomena; D003296:Cooking / Q000379:methods*; D061353:Food Storage; D005838:Genotype; D010316:Particle Size; D013213:Starch / Q000737:chemistry*; D014783:Viscosity; D003313:Zea mays / Q000737:chemistry*
chemical_list: D013213:Starch; D000687:Amylopectin
keywords: Average chain length distribution; Granule distribution; Hardness; Pasting properties; Postharvest changes; Shelf life