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J Agric Food Chem

Title:		Unraveling of the Fishy Off-Flavor in Steam-Treated Rapeseed Oil Using the Sensomics Concept
Author(s):		Matheis K; Granvogl M;
Address:		"Department fur Chemie , Lehrstuhl fur Lebensmittelchemie, Technische Universitat Munchen , Lise-Meitner-Strasse 34 , D-85354 Freising , Germany. Wissenschaftszentrum Weihenstephan fur Ernahrung, Landnutzung und Umwelt , Lehrstuhl fur Analytische Lebensmittelchemie, Technische Universitat Munchen , Maximus-von-Imhof-Forum 2 , D-85354 Freising , Germany. Institut fur Lebensmittelchemie, Fachgebiet fur Lebensmittelchemie und Analytische Chemie (170a) , Universitat Hohenheim , Fakultat Naturwissenschaften, Garbenstrasse 28 , D-70599 Stuttgart , Germany"
Journal Title:		J Agric Food Chem
Year:		2019
Volume:		20190124
Issue:		5
Page Number:		1484 - 1494
DOI:		10.1021/acs.jafc.8b05723
ISSN/ISBN:		1520-5118 (Electronic) 0021-8561 (Linking)
Abstract:		"The sensomics concept was applied to two steam-treated rapeseed oils, one eliciting a fishy off-flavor (OF) and the other the desired aroma attributes (PC = positive control). After screening the most important odorants via comparative aroma extract dilution analysis, identification experiments and quantitation via stable isotope dilution analysis (SIDA) using gas chromatography-mass spectrometry (GC-MS) were performed. Only five compounds differed in their concentrations by a factor >/=5. In addition, trimethylamine with an intense fishy odor quality and first overlooked by gas chromatography-olfactometry, was only present in OF and finally characterized via ion exchange chromatography and solid phase microextraction GC-MS. For data validation, recombination experiments were performed using all odorants with OAVs >/= 1, and excellent accordance between GS and OF and their corresponding recombinates was achieved, confirming a correct characterization of all key odorants with trimethylamine as the only odorant responsible for the fishy off-flavor"
Keywords:		Flavoring Agents/*chemistry Food Handling Gas Chromatography-Mass Spectrometry Humans Odorants/*analysis Olfactometry Rapeseed Oil/*chemistry Steam Volatile Organic Compounds/chemistry aroma extract dilution analysis aroma recombination fishy odor activit;
Notes:		"MedlineMatheis, Katrin Granvogl, Michael eng 2018/12/19 J Agric Food Chem. 2019 Feb 6; 67(5):1484-1494. doi: 10.1021/acs.jafc.8b05723. Epub 2019 Jan 24"