1H NMR studies of molecular mobility in wheat starch |
| |
| Affiliation: | 1. Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Ko?ice, Park Komenského 2, 042 00 Ko?ice, Slovakia;2. Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 842 36 Bratislava, Slovakia;1. College of Food Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China;2. Fisheries research institute, Wuhan academy of agricultural sciences, Wuhan, 430207, China;3. Department of Agriculture, University of Swabi, Anbar, 23561 Khyber Pakhtunkhwa, Pakistan |
| |
| Abstract: | Pulsed 1H NMR was used to determine moisture content and molecular mobility of wheat starch suspensions at water activity (aw) values between 0 and 0.93. Moisture determination by NMR agreed well with gravimetric determinations (R2=0.99). Transverse proton relaxation (T2) of the systems were identified using single pulse and CPMG experiments. T2 associated with starch molecules increased linearly from 7.1 to 10.1 μs as aw increased from 0 to 0.93, due to plasticizing effects of water. T2 associated with water molecules showed a linear increase up to aw of 0.69. Results indicated that 1H NMR could be employed to determine moisture content of starch suspension and to identify and quantify the molecular motion of starch chains and water molecules of starch suspensions at low moisture levels. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
