Water Distribution in Tofu and Application of T2 Relaxation Measurements in Determination of Tofu's Water-Holding Capacity

作者：Li, Teng; Rui, Xin; Li, Wei; Chen, Xiaohong; Jiang, Mei; Dong, Mingsheng^*

来源：Journal of Agricultural and Food Chemistry, 2014, 62(34): 8594-8601.

DOI：10.1021/jf503427m

• tofu
• low-field nuclear magnetic resonance
• water-holding capacity

Low-field nuclear magnetic resonance (LF-NMR) was introduced for the elucidation of tofu in the present study. After multiexponential analysis of relaxation decays, three water fractions centered at about 1.5-2.6, 24-114, and 132-305 ms were detected and identified as T-2b, T-21, and T-22, respectively. Principal component analysis (PGA) of the data revealed that sample aggregation was dependent on solubility of coagulants and contained anions. Stepwise centrifugation and microwave drying were employed as dehydration methods. Significant correlations were observed between T-21 and T-22 relaxation times and water-holding capacity (WHC) in both dehydration processes, which implied LF-NMR measurements could be an efficient method for determination and prediction of tofu's water-holding capacity. Ten linear equations that could be applied in prediction of WHC for tofu were reported. LF-NMR was suggested to be a powerful tool for the study of tofu.

• 出版日期2014-8-27
• 单位南京农业大学