High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus)
Changes in the fish muscle from cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) were investigated by high-resolution NMR and magnetic resonance imaging (MRI). Water- and salt-soluble extracts from fish stored at -20 degrees C and -30 degrees C were analysed by high-resolution proton NMR an...
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ftkingscollondon:oai:kclpure.kcl.ac.uk:publications/fdb39913-77fa-44cc-af9c-8944839d717b 2024-06-09T07:46:04+00:00 High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) Howell, N Shavila, Y Grootveld, M Williams, Steven 1996-09 https://kclpure.kcl.ac.uk/portal/en/publications/fdb39913-77fa-44cc-af9c-8944839d717b https://doi.org/10.1002/(SICI)1097-0010(199609)72:1<49::AID-JSFA621>3.0.CO;2-H eng eng https://kclpure.kcl.ac.uk/portal/en/publications/fdb39913-77fa-44cc-af9c-8944839d717b info:eu-repo/semantics/restrictedAccess Howell , N , Shavila , Y , Grootveld , M & Williams , S 1996 , ' High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) ' , Journal of the Science of Food and Agriculture , vol. 72 , no. 1 , pp. 49-56 . https://doi.org/10.1002/(SICI)1097-0010(199609)72:1<49::AID-JSFA621>3.0.CO;2-H article 1996 ftkingscollondon https://doi.org/10.1002/(SICI)1097-0010(199609)72:1<49::AID-JSFA621>3.0.CO;2-H 2024-05-15T00:03:52Z Changes in the fish muscle from cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) were investigated by high-resolution NMR and magnetic resonance imaging (MRI). Water- and salt-soluble extracts from fish stored at -20 degrees C and -30 degrees C were analysed by high-resolution proton NMR and enabled the identification of metabolites including trimethylamine oxide, trimethylamine (TMA) and dimethylamine. It was not possible to detect formaldehyde by NMR either in the stored fish samples or in spiked water or salt extracts even at high levels of formaldehyde addition, probably due to polymerisation. Systematic and controlled storage trials indicated the presence of dimethylamine at around 9 months for samples stored at -20 degrees C, whereas no changes were detected at the control storage temperature of -30 degrees C. A comparison of cod and haddock fillets stored for 1 year at -20 and -30 degrees C confirmed the production of dimethylamine only in cod stored at -20 degrees C. It was interesting to note that 'fresh' cod and haddock samples purchased from a local supermarket showed high levels of TMA indicating a breakdown of trimethylamine oxide to TMA by bacteria. TMA was not detected in the fish fillets especially obtained for the storage trials. MRI of fresh cod and fish stored at -8 and -30 degrees C indicated that the fish half stored at -8 degrees C exhibited dense lines or arches which are indicative of gaps in the tissue due to possible breakdown of the connective tissue. The images of fish stored at -30 degrees C did not indicate any differences compared with the fresh fish. MRI also showed the presence of frozen and unfrozen areas in the fish non-destructively. Article in Journal/Newspaper Gadus morhua King's College, London: Research Portal |
institution |
Open Polar |
collection |
King's College, London: Research Portal |
op_collection_id |
ftkingscollondon |
language |
English |
description |
Changes in the fish muscle from cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) were investigated by high-resolution NMR and magnetic resonance imaging (MRI). Water- and salt-soluble extracts from fish stored at -20 degrees C and -30 degrees C were analysed by high-resolution proton NMR and enabled the identification of metabolites including trimethylamine oxide, trimethylamine (TMA) and dimethylamine. It was not possible to detect formaldehyde by NMR either in the stored fish samples or in spiked water or salt extracts even at high levels of formaldehyde addition, probably due to polymerisation. Systematic and controlled storage trials indicated the presence of dimethylamine at around 9 months for samples stored at -20 degrees C, whereas no changes were detected at the control storage temperature of -30 degrees C. A comparison of cod and haddock fillets stored for 1 year at -20 and -30 degrees C confirmed the production of dimethylamine only in cod stored at -20 degrees C. It was interesting to note that 'fresh' cod and haddock samples purchased from a local supermarket showed high levels of TMA indicating a breakdown of trimethylamine oxide to TMA by bacteria. TMA was not detected in the fish fillets especially obtained for the storage trials. MRI of fresh cod and fish stored at -8 and -30 degrees C indicated that the fish half stored at -8 degrees C exhibited dense lines or arches which are indicative of gaps in the tissue due to possible breakdown of the connective tissue. The images of fish stored at -30 degrees C did not indicate any differences compared with the fresh fish. MRI also showed the presence of frozen and unfrozen areas in the fish non-destructively. |
format |
Article in Journal/Newspaper |
author |
Howell, N Shavila, Y Grootveld, M Williams, Steven |
spellingShingle |
Howell, N Shavila, Y Grootveld, M Williams, Steven High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) |
author_facet |
Howell, N Shavila, Y Grootveld, M Williams, Steven |
author_sort |
Howell, N |
title |
High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) |
title_short |
High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) |
title_full |
High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) |
title_fullStr |
High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) |
title_full_unstemmed |
High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) |
title_sort |
high-resolution nmr and magnetic resonance imaging (mri) studies on fresh and frozen cod (gadus morhua) and haddock (melanogrammus aeglefinus) |
publishDate |
1996 |
url |
https://kclpure.kcl.ac.uk/portal/en/publications/fdb39913-77fa-44cc-af9c-8944839d717b https://doi.org/10.1002/(SICI)1097-0010(199609)72:1<49::AID-JSFA621>3.0.CO;2-H |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Howell , N , Shavila , Y , Grootveld , M & Williams , S 1996 , ' High-resolution NMR and magnetic resonance imaging (MRI) studies on fresh and frozen cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) ' , Journal of the Science of Food and Agriculture , vol. 72 , no. 1 , pp. 49-56 . https://doi.org/10.1002/(SICI)1097-0010(199609)72:1<49::AID-JSFA621>3.0.CO;2-H |
op_relation |
https://kclpure.kcl.ac.uk/portal/en/publications/fdb39913-77fa-44cc-af9c-8944839d717b |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/(SICI)1097-0010(199609)72:1<49::AID-JSFA621>3.0.CO;2-H |
_version_ |
1801375819994497024 |