Effect of Roasting on Fatty Acid Profile of Brown and Yellow Varieties of Flaxseed (Linum usitatissimum L)

Purpose: To monitor changes in fatty acid profiles of brown and yellow varieties of flaxseeds in the raw and roasted states using gas chromatography (GC).Methods: Samples of flaxseeds were extracted with n-hexane in a Soxhlet apparatus for 8 h. Methylesterification of the samples was performed by methanolic boron trifluoride (BF3-MeOH) method according to American Oil Chemists' Society (AOCS). Fatty acid (FA), analyzed using GC equipped with a split/splitless capillary injector and flame ionization detector (FID).Results: The results indicate that lipid content varied with the type of seed. Seed oil content was 53.31 ± 0.30 and 45.20 ± 0.20 % for roasted and unroasted brown flax, respectively, and 10.25 ± 0.04 % for the yellow type. The yellow and roasted brown type, at 300oC, showed the lowest and highest oil content, respectively. The highest calculated oxidizability (COX) value was found for the unroasted brown type (13.19 ± 0.01 %) whilst the lowest amount was observed for the roasted brown seed at 350oC (12.79 ± 0.01 %). COX value for yellow type was 5.62 ± 0.01 %.Conclusion: This study shows that the fatty acids content of flaxseeds vary with roasting conditions. This is significant because flax seed fatty acid composition influences the applications of the oil.Keywords: Oil, Flaxseed, Roasting, Fatty acid, Linum usitatissimum, Calculated oxidizability valu

Mapping Scheme of Traditional Iranian Medicine Cluster’s Crotch in the Structure of Metathesaurus of Unified Medical Language System (UMLS)

Background & Aim: Unified Medical Language System (UMLS) is an extensive ontology of biomedical knowledge developed and maintained by U.S. National Library of Medicine (NLM). Traditional Iranian Medicine (TIM) does not have any position in the structure of metathesaurus of UMLS. The main aim of this study was designing a scheme of TIM cluster's crotch mapping in the structure of metathesaurus of UMLS. Moreover, the TIM position and its proportion in the domain of vocabulary and concepts of universal medical knowledge was another aim of this study.Materials and Methods: System analysis was the method of this study. To investigate structure of UMLS metathesaurus, and to survey lacking of TIM cluster's crotch, we applied UMLS Knowledge Source (KS) by using inductive, deductive, inductive-deductive approaches.Results: One Concept Unique Identifier (CUI); two synonym terms with Lexical Unique Identifier (LUI), L0025131 and L6330122; two ancestor and parent concept; nine concepts which with TIM crotch were the child concepts of two ancestor and parent; eighteen sibling concepts; six narrower; and five other related found concepts were identified for the proposal TIM crotch mapping in metathesaurus of UMLS. In addition, we found the "Biomedical Occupation or Discipline" semantic type assigned to it.Conclusions: Current domain of metathesaurus of UMLS does not represent complete and formal domain and position of TIM. Therefore, this metathesaurus needs to depict a domain and position for TIM