Relationship Between Water Migration and Quality Changes of Yellowfin Tuna (<i>Thunnus albacares</i>) During Storage at 0°C and 4°C by LF-NMR

<p>This study investigated postmortem changes of yellowfin tuna (<i>Thunnus albacares</i>) and water migration upon storage at 0°C and 4°C as determined by low-field nuclear magnetic resonance (LF-NMR <sup>1</sup>H). It clearly showed that with increasing storage time, sensory scores and physical evaluations (hardness, chewiness), proton density of the water, and moisture content decreased, while total volatile basic nitrogen (TVB-N), <i>K</i> value, aerobic plate counts (APCs), and psychrotrophic bacterial counts increased. The results of LF-NMR showed that <i>T</i><sub>21</sub> (trapped water) had extremely significant correlations with sensory evaluation, texture profile analysis, TVB-N, <i>K</i> value, APC, and psychrotrophic bacteria (<i>p </i>< 0.01) and established multiple linear regression. It was concluded that the LF-NMR was an important technique to evaluate storage time and temperature of yellowfin tuna’s quality in terms of water migration during low-temperature storage.</p>