title: The mechanism of starch granule reacted with OSA by phase transition catalyst in aqueous medium.
abstract: The reactivity of octenyl succinic anhydride (OSA) with starch by phase transition catalyst (PTC) was investigated. The effects of two types (quaternary ammonium salt and non-ionic surfactant) and concentrations of PTC on the degree of substitution (DS) and reaction efficiency (RE) of OS-starch were examined. In aqueous medium, the use of a PTC, polyoxyethylene lauryl ether (AEO) produced derivatives with higher DS than others. The DS of OS-starch reached 0.0195 with 0.1% AEO, significantly higher than that (0.0182) without the use of PTC. As the concentration of AEO increased, the DS of OS-starch did not increase. The structural of AEO was investigated by nuclear magnetic resonance (NMR) spectroscopy. Conductivity measurement and Fourier transform infrared (FT-IR) spectroscopy confirmed that AEO could form complexes with Na(+). The complex of AEO and Na(+) could combine with starch-O(-), it should be possible to improve the transport of anion starch-O(-) to the hydrophobic reagents.
authors.affiliation: College of Food Sciences, South China University of Technology, 381 Wushan Road, Guangzhou 510640, PR China.
authors.forename: Chan
authors.initials: C
authors.lastname: Wang
authors.forename: Xiao-Wei
authors.initials: XW
authors.lastname: He
authors.forename: Qiang
authors.initials: Q
authors.lastname: Huang
authors.forename: Fa-Xing
authors.initials: FX
authors.lastname: Luo
authors.forename: Xiong
authors.initials: X
authors.lastname: Fu
mesh_terms: D002384:Catalysis; D044367:Phase Transition; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry*; D013387:Succinic Anhydrides / Q000737:chemistry*
chemical_list: D013387:Succinic Anhydrides; C031801:succinic anhydride; D013213:Starch
keywords: (1)H NMR; (1)H nuclear magnetic resonance; AEO; BTMAB; CTAB; DS; EO; FT-IR; Fourier transform infrared spectroscopy; OSA; Octenyl succinic anhydride; PTC; Phase transition catalyst; RE; Starch; TBAB; benzyltrimethyl ammonium bromide; cetyltrimethyl ammonium bromide; degree of substitution; ethylene oxide; octenyl succinic anhydride; phase transition catalyst; polyoxyethylene lauryl ether; reaction efficiency; tetrabutylammonium bromide