✍ Scribed by Jepsen, Signe M; Pedersen, Henrik T; Engelsen, S�ren B
No coin nor oath required. For personal study only.
The possibilities for application of low-®eld 1 H nuclear magnetic resonance (NMR) as a rapid method for simultaneous assessment of basic quality parameters in ®sh were explored. In a ®rst experiment, 200 salmon (Salmo salar) samples mapping the variation over an entire ®sh were measured by NMR and subsequently analysed for oil or water content by standard chemical methods. In a second experiment, 58 differently thawed cod (Gadus morhua) samples were measured by NMR and subsequently analysed for water-holding capacity. Correlations between chemical data and NMR data were evaluated using partial least squares (PLS) regression on complete relaxation curves and compared with conventional regression models on exponential ®tting parameters. Predictions on an independent test set were superior for the PLS regression models, with optimal prediction errors of 12 g kg À1 , 6g kg À1 and 3.9% for oil and water content in fresh salmon ¯esh and water-holding capacity in thawed cod ¯esh respectively. Thus rapid, non-invasive low-®eld NMR can be used to simultaneously determine both oil and water content of ®sh ¯esh. Furthermore, it can predict water-holding capacity of cod ¯esh, with an R 2 of 0.9 over the range 30±90%, as determined by a centrifuge test.
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