Determination of hydrophobicity of dry-heated wheat starch granules using sucrose fatty acid esters (SFAE) |
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| Authors: | Aya Tabara Hiroshi Oneda Ryuji Murayama Yuko Matsui Akira Hirano |
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| Institution: | 1. Faculty of Home Economics, Laboratory of Food Technology, Kobe Women’s University, Kobe, Japan;2. Nagata Sangyo Co., Ltd., Shiso, Japan;3. Morinaga Seika Co., Ltd., Yokohama, Japan |
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| Abstract: | Sucrose fatty acid esters (SFAE) were adsorbed onto dry-heated (120?°C for 10, 20, 40, 60, and 120?min) wheat starch granules and extracted with ethyl ether in a Soxhlet apparatus without gelatinization of the starch granules. The amount of sucrose in the extracted SFAE was determined by the phenol sulfate method. A gradual increase of the sucrose from 159 to 712?μg, in SFAE per gram of starch, occurred with increasing dry-heating time and demonstrated the increased hydrophobicity of the starch granules. Increase of the SFAE was highly correlated (r?=?0.9816) to increase of the oil-binding capacity of the dry-heated wheat starch granules. Non-waxy rice, waxy rice, sweet potato, and potato starch granules also showed higher hydrophobicity after dry-heating by this method. |
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| Keywords: | hydrophobicity SFAE dry-heated starch granule oil-binding capacity |
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