title: Granular size of potato starch affects structural properties, octenylsuccinic anhydride modification and flowability.
abstract: Native potato starch (PS) granules were separated into three size fractions: larger than 30μm (P-L), 15-30μm (P-M), and smaller than 15μm (P-S). The morphological and crystalline structure of fractionated potato starches were investigated by light and scanning electron microscopy (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The P-L fraction showed ellipsoidal shape and B-type X-ray pattern, whereas the P-S fraction had spherical shape and A-type pattern. The fluorophore-assisted capillary electrophoresis data showed that the P-L fraction had more B2 chains and less short A and B1 chains than the P-S counterparts. Smaller granules with larger specific surface area had higher degree of substitution when reacted with octenylsuccinic anhydride (OSA), and showed more uniform distribution of octenylsuccinate substituents. Both OSA modified and unmodified P-S samples showed higher flowability compared with the P-L counterparts.
authors.affiliation: School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China.
authors.forename: Chan
authors.initials: C
authors.lastname: Wang
authors.affiliation: School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China.
authors.forename: Chuan-He
authors.initials: CH
authors.lastname: Tang
authors.affiliation: School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China.
authors.forename: Xiong
authors.initials: X
authors.lastname: Fu
authors.affiliation: School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China. Electronic address: fechoh@scut.edu.cn.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Huang
authors.affiliation: School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China. Electronic address: zhangb@scut.edu.cn.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang
mesh_terms: D019075:Electrophoresis, Capillary; D008855:Microscopy, Electron, Scanning; D011198:Solanum tuberosum / Q000737:chemistry*; D013213:Starch / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D014961:X-Ray Diffraction / Q000379:methods
chemical_list: C551966:octenyl succinic anhydride-modified starch; D013213:Starch
keywords: Flowability; Granule size; Methylene blue (PubChem: 6099); Octenylsuccinate starch; Octenylsuccinic anhydride (PubChem CID: 5362721); Potato starch; Reaction efficiency; Starch (PubChem CID: 24836924); Water (PubChem CID: 962)