title: Pasting and thermal properties of waxy corn starch modified by 1,4-α-glucan branching enzyme.
abstract: Waxy corn starch was modified with the 1,4-α-glucan branching enzyme (GBE) from Geobacillus thermoglucosidans STB02. Incubating waxy corn starch with GBE increased the number of α-1,6 branch points and reduced the average chain length. Enzymatic modification also decreased the breakdown and setback values of Brabender viscosity curves, indicating that the modified starch had higher paste stability. Preheating the starch at 65°C for 30min before incubation with GBE could promote enzymatic modification of starch. Linear regression was used to describe the relationships between starch structure and its pasting and thermal properties. The setback value showed a negative linear correlation with the α-1,6 branch point content (R2=0.9824) and a positive linear correlation with the average chain length (R2=0.8954). Meanwhile, the gelatinization enthalpy was also linearly correlated to the α-1,6 branch point content (R2=0.9326) and the average chain length (R2=0.8567). These insights provide a useful reference for food processors.
authors.affiliation: School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
authors.forename: Junyan
authors.initials: J
authors.lastname: Ren
authors.affiliation: School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Collaborative innovation center of food safety and quality control in Jiangsu Province, China.
authors.forename: Caiming
authors.initials: C
authors.lastname: Li
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi, Jiangsu 214122, China; Collaborative innovation center of food safety and quality control in Jiangsu Province, China.
authors.forename: Zhengbiao
authors.initials: Z
authors.lastname: Gu
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Collaborative innovation center of food safety and quality control in Jiangsu Province, China.
authors.forename: Li
authors.initials: L
authors.lastname: Cheng
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi, Jiangsu 214122, China; Collaborative innovation center of food safety and quality control in Jiangsu Province, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Hong
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi, Jiangsu 214122, China; Collaborative innovation center of food safety and quality control in Jiangsu Province, China. Electronic address: zfli@jiangnan.edu.cn.
authors.forename: Zhaofeng
authors.initials: Z
authors.lastname: Li
mesh_terms: D015061:1,4-alpha-Glucan Branching Enzyme / Q000378:metabolism*; D056506:Geobacillus / Q000201:enzymology; D006027:Glycosides / Q000737:chemistry; D009824:Ointments; D013213:Starch / Q000737:chemistry* / Q000378:metabolism; D013696:Temperature; D014885:Waxes / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry*
chemical_list: D006027:Glycosides; D009824:Ointments; D014885:Waxes; D013213:Starch; D015061:1,4-alpha-Glucan Branching Enzyme
keywords: 1,4-α-glucan branching enzyme; Enzymatic modification; Waxy corn starch