Preparation and characterization of modified starch granules with high hydrophobicity and flowability.
Normal cornstarch (NC) was chemically modified by octenylsuccinic anhydride (OSA) and Al2(SO4)3. The effects of the concentration of NaOH, OSA, and Al2(SO4)3 on the properties of modified starch(OS-starch-Al) were investigated. The OS-starch-Al was characterized by repose angle, activation index, inductively coupled plasma-atomic emission spectrometry (ICP-OES), light microscopy, SEM, FT-IR, and (27)Al NMR. The results showed that pH 4 was the optimum condition for Al(3+) cross-linking with OS-starch and for obtaining high flowability and hydrophobicity. When the concentration of OSA and Al2(SO4)3 was 2%, the OS-starch-Al was characterized by high flowability. A concentration of 4% OSA and Al2(SO4)3 yielded the highest activation index. The moisture content affected the flowability of native NC, but had a minor effect on OS-starch-Al. SEM and polarized microscopy revealed that the modification had slight effects on the crystalline structure and morphology of NC. During the preparation, some dust particles functioning as flow additives were produced on the surface of starch granules. The results of FT-IR, ICP-OES, and (27)Al NMR confirmed the formation of ester group and the cross-link with Al(3+).
College of Food Sciences, South China University of Technology, 381 Wushan Road, Guangzhou 510640, PR China.
Fengdan
F
Chang
College of Food Sciences, South China University of Technology, 381 Wushan Road, Guangzhou 510640, PR China.
Xiaowei
X
He
College of Food Sciences, South China University of Technology, 381 Wushan Road, Guangzhou 510640, PR China.
Xiong
X
Fu
College of Food Sciences, South China University of Technology, 381 Wushan Road, Guangzhou 510640, PR China. Electronic address: fechoh@scut.edu.cn.
Qiang
Q
Huang
College of Food Sciences, South China University of Technology, 381 Wushan Road, Guangzhou 510640, PR China.
Yaofang
Y
Qiu
D057927:Hydrophobic and Hydrophilic Interactions; D010936:Plant Extracts; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry*
D010936:Plant Extracts; D013213:Starch
FT-IR; Flowability; Fourier transform infrared spectroscopy; Hydrophobicity; ICP-OES; NC; NMR; Normal cornstarch; OS-starch; OS-starch-Al; OSA; Octenylsuccinic anhydride modified starch; SEM; Starch granules; inductively coupled plasma-atomic emission spectrometry; normal cornstarch; nuclear magnetic resonance; octenylsuccinic anhydrate; octenylsuccinic starch ester; scanning electron microscopy; starch samples modified by OSA and Al(2)(SO(4))(3)