title: Effect of octenylsuccinic anhydride modification on β-amylolysis of starch.
abstract: The effects of octenylsuccinic anhydride (OSA) modification of waxy maize and sorghum starches on subsequent β-amylolysis are examined. Hydrolysis with β-amylase is a method by which OSA starches may be structurally modified for industrial purposes. The hydrolysis of both granular and gelatinised forms of both starches follows first-order kinetics regardless of the OSA used as a percent of starch mass (0-24%). The highest hydrolysis rate coefficients for granular starches are at modification with 6% OSA/starch. The largest molecular sizes of β-amylase hydrolysed OSA-modified gelatinised starches are found at modification with 24% OSA/starch. The results suggest that octenylsuccinyl groups have an action-blocking effect on β-amylolysis of gelatinised starch, but the effect of semi-crystalline granular structure is more pronounced than that of OSA modification. Hence β-amylolysis can be used under appropriate conditions to modify the structure of gelatinised OSA-modified starches.
authors.affiliation: Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China.
authors.forename: Michael C
authors.initials: MC
authors.lastname: Sweedman
authors.forename: Jovin
authors.initials: J
authors.lastname: Hasjim
authors.forename: Morgan J
authors.initials: MJ
authors.lastname: Tizzotti
authors.forename: Christian
authors.initials: C
authors.lastname: Schäfer
authors.forename: Robert G
authors.initials: RG
authors.lastname: Gilbert
mesh_terms: D006868:Hydrolysis; D007700:Kinetics; D045868:Sorghum / Q000737:chemistry; D013213:Starch / Q000737:chemistry*; D013386:Succinates / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry; D001614:beta-Amylase / Q000378:metabolism*
chemical_list: D013386:Succinates; C028480:octenyl succinate; D013213:Starch; D001614:beta-Amylase