Amylopectin internal molecular structure in relation to physical properties of sweetpotato starch

Fan Zhu*, Harold Corke, Eric Bertoft

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Unit chain length distributions of amylopectins and their φ,β-limit dextrins (reflecting amylopectin internal part) from 11 Chinese sweetpotato genotypes were characterized by high performance anion-exchange chromatography after debranching, and were related to the thermal and pasting properties of granular starches. The weight-based unit chain length profiles of whole amylopectin and their internal parts both had three distinguishable major groups with approximate range of DP 6-36, 37-68, and >69 for amylopectins and DP 3-25, 26-55, and >55 for φ,β-limit dextrins. Among different genotypes, two different patterns of Bfp (fingerprint B-chains, DP 3-7) were observed for φ,β-limit dextrins, whereas Afp (fingerprint A-chains, DP 6-8) for whole amylopectins were consistent. Reconstruction of amylopectins from their φ,β-limit dextrins revealed that B-chains with internal DP > 20 possessed an external chain length corresponding to the average value DP 12.8. Wide genetic variations were recorded among structural parameters, of which several concerning the amylopectin internal part were highly correlated to the thermal and pasting parameters of sweetpotato starches, and suggested that the internal part of amylopectin is critical to the physical behavior of granular starch.

Original languageEnglish
Pages (from-to)907-918
Number of pages12
JournalCarbohydrate Polymers
Volume84
Issue number3
DOIs
StatePublished - 17 Mar 2011
Externally publishedYes

Keywords

  • Chain category
  • Internal unit chain distribution
  • Structure-properties relationship
  • Sweetpotato amylopectin structure

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