Publication no. C-1997-0105-04R |  VIEW ARTICLE

Amylopectin Staling of Cooked Milled Rices and Properties of Amylopectin and Amylose.

Corazon P. Villareal (1), Susumu Hizukuri (2), and Bienvenido O. Juliano (1,3). (1) International Rice Research Institute, Los Baños, Laguna, Philippines. (2) Department of Biochemical Science and Technology, Kagoshima University, 21-24 Korimoto, Kagoshima, Japan 890. (3) Present address: Philippine Rice Research Institute Division of Rice Chemistry and Food Science, UPLB Campus, 4031 College, Laguna, Philippines. Cereal Chem. 74(2):163-167. Accepted October 28, 1996. Copyright 1997 by the American Association of Cereal Chemists, Inc.

Starches of waxy rices that showed varietal differences in hardness testing of cooked rice after amylopectin staling and high-amylose content (AC) rices differing in gel consistency (GC) and starch gelatinization temperature (GT) were studied to determine the factors related to varietal differences in amylopectin staling of cooked rice. Intermediate- and high-GT starches showed greater amylopectin staling of gelatinized rice by hardness testing values or differential scanning calorimetry (DSC) endotherm than did low-GT starches in both waxy and nonwaxy rices. Isoamylase-debranched amylopectins of waxy rices differed in the ratio of weight-average degree of polymerization (DP(w)) fractions, but these fraction ratios were not simply related to differences in amylopectin staling of cooked rice. Among high-AC rices, amylopectin from low-GT starch was confirmed to have higher iodine affinity (2.3-2.5%) than amylopectin from intermediate-GT starches (1.7-1.8%), regardless of GC. Within high-AC starch of the same GT type, soft-GC rice corresponded with more A + B(1) DP(w) 16-18 and less B(3) DP(w) 150-200 fractions of debranched amylopectin and low DP(w) of amylose. Amylopectin of amylose extender mutant of IR36 was confirmed to have a longer chain length than ordinary rice amylopectin: the debranched amylopectin has more B(2) DP(w) 47-51 fraction, less A + B(1) DP(w) fraction, but no B(4) fraction with DP(w) >200. Only high-AC amylopectin had debranched fraction with DP(w) >120.