TY - JOUR
T1 - Amylopectin internal molecular structure in relation to physical properties of sweetpotato starch
AU - Zhu, Fan
AU - Corke, Harold
AU - Bertoft, Eric
N1 - Funding Information:
Sweetpotato roots were kindly provided by associate professor Xinsun Yang at Institute of Crop Science, Hubei Academy of Agricultural Sciences, Wuhan, China. Kind advice from professor Per Ǻman, Dr. Kristine Koch, and Dr. Roger Andersson at the Department of Food Science, Swedish University of Agricultural Sciences, Uppsala, Sweden, is greatly acknowledged. This research was supported by The University of Hong Kong Seed Funding for Basic Research and The University of Hong Kong Committee on Research and Conference Grants .
PY - 2011/3/17
Y1 - 2011/3/17
N2 - 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.
AB - 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.
KW - Chain category
KW - Internal unit chain distribution
KW - Structure-properties relationship
KW - Sweetpotato amylopectin structure
UR - http://www.scopus.com/inward/record.url?scp=79951682048&partnerID=8YFLogxK
U2 - 10.1016/j.carbpol.2010.12.039
DO - 10.1016/j.carbpol.2010.12.039
M3 - 文章
AN - SCOPUS:79951682048
VL - 84
SP - 907
EP - 918
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
SN - 0144-8617
IS - 3
ER -