Presentation Details
| Odor Aging Induced by Atmospheric Oxidation in a Flow-Tube Reactor Eunyeong Jin, Joseph Byron, Alexandra Gutmann, Jonathan Williams. Max Planck Institute for Chemistry, Mainz, Germany |
Abstract
The goal of this study on odor aging induced by atmospheric oxidation in a flow reactor is to investigate how odor quality changes due to atmospheric oxidants such as ozone. The study also aims to identify any common features among the oxidized odors from different starting reagent, even if their chemical compositions differ. In this study, TD-GC-Q-TOF was used for chemical characterization, and sensory evaluation, including hedonic ratings as well as odor quality assessments, will be conducted to investigate the relationship between chemical composition and human perception. For ozone oxidation of chemical compounds, a flow reactor was employed to provide a well-defined residence time while minimizing side reactions compared to a chamber system. The system was designed for cartridge sampling followed by TD-GC-Q-TOF qualitative analysis of oxidation products and human perception tests, and the homogeneity at the inlet and outlet of the flow reactor was confirmed. The oxidation of (+)-limonene yielded compounds such as 4-acetyl-1-methylcyclohexene, trans-dihydrocarvone, and carvone. In the perception test conducted with five panelists, three of them described the resulting odor as having changed to a minty or fresh character. So far, oxidation experiments were conducted for (−)-limonene (terpene), α-pinene (herbal), geraniol (floral), cis-3-hexen-1-ol (green), linalool (floral), 1-octen-3-ol (earthy), cinnamyl alcohol (balsamic), anethole (licorice), allyl phenylacetate (honey), and ocimenes (floral), and only qualitative analyses were performed. Further perception tests will be conducted using a triangle test method, and hedonic reports as well as an inspiratory volume sensor will be incorporated into the evaluation criteria.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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