Nuclear magnetic resonance technique application in evaluating the quality of navel orange during storage
Jinsheng Zhang
Abstracts, 14th World Congress of Food Science & Technology, October 19-23 2008, Shanghai, China. 721 pages.
2008
บทคัดย่อ
Low field nuclear magnetic resonance technique was used to evaluate the quality and behavior of water in navel orange during storage in different temperature. NMR Carr-Purcell-Meiboom-Gill (CPMG) sequence was used to acquire the samplesÂ’ activated echo signals. A mult-exponential regress model was used to calculate the spin-spin relaxztion time (T2) of samples in different storage period. The relative chemical contents such as acidity, reducing sugar et al were analyzed at the same time during the deferent period of storage. A trend of T2 change was observed in the state diagram T2 vs storage time. T2 values rises in the initial stage and then changed little in the following steady period and go down quickly at the end before the samples decay during the period of storage. A T2 going down quickly processing before decay were observed in nearly all samples. This method would be help for evaluating the quality of navel orange storage in the future.