Application of chemometrics to low-field H-1 NMR relaxation data of intact fish flesh

Signe Munk Jepsen, H.T. Pedersen, S.B. Engelsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The possibilities for application of low-field H-1 nuclear magnetic resonance (NMR) as a rapid method for simultaneous assessment of basic quality parameters in fish were explored. In a first experiment, 200 salmon (Salmo salar) samples mapping the variation over an entire fish 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 fitting parameters. Predictions on an independent test set were superior for the PLS regression models, with optimal prediction errors of 12 g kg(-1), 6 g kg(-1) and 3.9% for oil and water content in fresh salmon flesh and water-holding capacity in thawed cod flesh respectively. Thus rapid, non-invasive low- field NMR can be used to simultaneously determine both oil and water content of fish flesh. Furthermore, it can predict water- holding capacity of cod flesh, with an R-2 of 0.9 over the range 30-90%, as determined by a centrifuge test. (C) 1999 Society of Chemical Industry
    Original languageEnglish
    JournalJournal of the Science of Food and Agriculture
    Volume79
    Issue number13
    Pages (from-to)1793-1802
    ISSN0022-5142
    Publication statusPublished - 1999

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