Molecular mobility of fish flesh measured by low-field nuclear magnetic resonance (LF-NMR) relaxation: effects of freeze–thaw cycles

In this study, the molecular mobility of fish flesh was measured by low field nuclear magnetic resonance (LF-NMR) relaxation. Sardine, tuna and mackerel were frozen at −40 °C and stored for 1 day (24 h); and then these samples were thawed at room temperature (20 °C). The relaxation of water protons...

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Bibliographic Details
Published in:Fisheries science 2017-09, Vol.83 (5), p.845-851
Main Authors: Al-Habsi, Nasser Abdullah, Al-Hadhrami, Sara, Al-Kasbi, Habiba, Rahman, Mohammad Shafiur
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Bound water
Cycles
Fish
Fish & Wildlife Biology & Management
Food Science
Freeze thaw cycles
Freeze-thawing
Freezing
Freshwater & Marine Ecology
Identification
Life Sciences
Mackerel
Magnetic induction
Marine fishes
Mobility
NMR
Nuclear magnetic resonance
Original Article
Pools
Proteins
Protons
Relaxation time
Resonance
Water chemistry
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Summary:In this study, the molecular mobility of fish flesh was measured by low field nuclear magnetic resonance (LF-NMR) relaxation. Sardine, tuna and mackerel were frozen at −40 °C and stored for 1 day (24 h); and then these samples were thawed at room temperature (20 °C). The relaxation of water protons in fish flesh was measured for fresh (i.e., before freezing) and multi-cycle freeze–thaw samples (i.e., up to 12 times). Three domains from different pools of protons (i.e., low-mobile, medium-mobile and high-mobile) were identified from the relaxation curve. The T 2b (low-mobile), T 21 (medium-mobile) and T 22 (high-mobile) indicated the proton populations in the protein molecules, strongly bound water molecules, and weakly bound water molecules, respectively. In all cases, the relaxation time ( T 2b : sardine r  = 0.736 and p  
ISSN:0919-9268
1444-2906
DOI:10.1007/s12562-017-1114-0