A non-invasive method for quantitative monitoring of quality changes and water migration in bigeye tuna (Thunnus obesus) during simulated cold chain logistics using low-field nuclear magnetic resonance coupled with PCA

Abstract

Bigeye tuna ( Thunnus obesus) is an important fish species worldwide due to its desirable flavour and rich nutrition. Cold chain logistics is one of the most common methods to store and sell bigeye tuna ( Thunnus obesus). The purpose of this study was to investigate how bigeye tuna ( T. obesus) deteriorate during simulated cold chain logistics with fluctuating temperatures by monitoring the quality changes and water distribution. The physical and chemical results showed that the sensory score, texture profile analysis (TPA), and water holding capacity (WHC) decreased, while total volatile basic nitrogen (TVB-N), K value, aerobic plate counts (APC), and psychrotrophic bacterial counts increased with fluctuating temperatures during 132 h. Low-field nuclear magnetic resonance (LF-NMR) and magnetic resonance imaging (MRI) detection showed that the T21 (trapped water) and proton density decreased, while T22 (free water) decreased initially and then increased, indicating continuous water loss and water migration during storage. Principal component analysis (PCA) revealed that springiness, hardness, chewiness, T21, and sensory score were correlated with each other ( p < 0.05) and the linear combination of quality indicators and T2transverse relaxation time was established. Besides, temperature fluctuation (batch 3) accelerated the deterioration of bigeye tuna according to the comprehensive score of PCA. Results were based on LF-NMR which can be used to monitor quality changes in a fast non-invasive manner.

Effect of different thawing methods on the quality of mackerel (Pneumatophorus japonicus)

“…Figure 4 (C) is a magnetic resonance image of each group. The red part of the pattern represented by high proton density, and blue indicates low proton density (Wang et al, 2020d ). The higher the density of red in the pattern, the more water there is in the fish (Zhu et al, 2021 ).…”

Quality improvement of fresh extruded rice ‐ shaped kernels by microwave‐aided puffing technology

“…The results of the pseudo‐color images visually showed the change in each sample, with warm tone (red) indicating high proton density and cold tone (blue) representing low proton density. Higher proton density signified a higher water content (Jiang et al., 2020; Wang et al., 2020). As shown by MRI, the warm color areas of the central region of FERs grain became bigger and bigger, and the cold color area was reduced, which meant that the water content of FER continually rose due to microwave treatment.…”

“…The results of the pseudo-color images visually showed the change in each sample, with warm tone (red) indicating high proton density and cold tone (blue) representing low proton density. Higher proton density signified a higher water content (Jiang et al, 2020;Wang et al, 2020 TA B L E 2 Effect of different microwave power (MP) treatment on pyrolysis characteristics parameters and WAI of FER and the cold color area was reduced, which meant that the water content of FER continually rose due to microwave treatment. The MRI results were in accordance with the previously mentioned T 2 relaxation time curves and the results of WAI.…”

“…The results of the pseudo-color images visually showed the change in each sample, with warm tone (red) indicating high proton density and cold tone (blue) representing low proton density. Higher proton density signified a higher water content (Jiang et al, 2020;Wang et al, 2020…”

Colloidal Particles in Tuna Head Soup: Chemical Localization, Structural Change, and Antioxidant Property

“…Tuna is a diverse family of marine fish and widely distributed in the tropical and subtropical waters of the major oceans such as the North Atlantic and Indian Ocean (1). Among the tuna family, bigeye tuna (Thunnus obesus) is one of the major species on the global tuna market (2). Tuna is rich in protein, vitamins, minerals, and omega-3 unsaturated fatty acids such as docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA).…”