Document Detail

Detection, isolation and characterisation of cyclolinopeptides J and K in ageing flax.
MedLine Citation:
PMID:  23411308     Owner:  NLM     Status:  In-Data-Review    
Methionine sulfone containing peptides CLs J (11) and K (12) may be produced from their reduced forms by oxidation but it is not known if these compounds occur in foods that contain flax. These compounds have been reported to possess greater immunosuppressive activity than their reduced methionine sulfoxide peptide forms 4 and 6, respectively. Since 11 and 12 have not been detected in commercial flax oil and milled flax seed, we tested for their presence in flax food products. Here we report that 11 and 12 accumulate in ground flaxseed that is exposed to air and heat (100°C) for more than 4h. Standards of 11 and 12 were prepared, isolated and extensively characterised using HPLC-MS/MS, 1D and 2D NMR methods. We also report the excellent thermal and oxidative stability of these peptides. Due to the harsh conditions required to produce 11 and 12, it is expected that their levels in flax based foods would be low and therefore their presence could serve as an indicative measure of severe oxidation of a food product.
Pramodkumar D Jadhav; Denis P Okinyo-Owiti; Pearson W K Ahiahonu; Martin J T Reaney
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Publication Detail:
Type:  Journal Article     Date:  2012-11-16
Journal Detail:
Title:  Food chemistry     Volume:  138     ISSN:  0308-8146     ISO Abbreviation:  Food Chem     Publication Date:  2013 Jun 
Date Detail:
Created Date:  2013-02-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7702639     Medline TA:  Food Chem     Country:  England    
Other Details:
Languages:  eng     Pagination:  1757-63     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Department of Food and Bioproduct Sciences, University of Saskatchewan, Saskatoon, SK, Canada S7N5A8.
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