Position of modifying groups on starch chains of octenylsuccinic anhydride-modified waxy maize starch.
Octenylsuccinic anhydride (OSA)-modified starches with a low (0.018) and high (0.092) degree of substitution (DS) were prepared from granular native waxy maize starch in aqueous slurry. The position of OS substituents along the starch chains was investigated by enzyme hydrolysis followed by chromatographic analysis. Native starch and two OS starches with a low and high DS had β-limit values of 55.9%, 52.8%, and 34.4%, respectively. The weight-average molecular weight of the β-limit dextrin from the OS starch with a low DS was close to that of the β-limit dextrin from native starch but lower than that of the β-limit dextrin from the OS starch with a high DS. Debranching of OS starches was incomplete compared with native starch. OS groups in the OS starch with a low DS were located on the repeat units near the branching points, whereas the OS substituents in the OS starch with a high DS occurred both near the branching points and the non-reducing ends.
Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506, USA.
Yanjie
Y
Bai
USDA-ARS, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan, KS 66502, USA.
Rhett C
RC
Kaufman
USDA-ARS, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan, KS 66502, USA.
Jeff D
JD
Wilson
Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506, USA. Electronic address: ycshi@ksu.edu.
Yong-Cheng
YC
Shi
D006868:Hydrolysis; D015394:Molecular Structure; D010084:Oxidation-Reduction; D013213:Starch / Q000031:analogs & derivatives* / Q000737:chemistry; D014783:Viscosity; D003313:Zea mays / Q000737:chemistry*
C551966:octenyl succinic anhydride-modified starch; D013213:Starch
Modified starch; Octenylsuccinic anhydride; Starch structure; Substitution distribution; Waxy maize starch