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Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment

Thermal stabilities of four major components (l-menthol, l-menthone, piperitone, and l-menthyl acetate) of Japanese mint essential oil were evaluated via subcritical water treatment. To improve experimental throughput for measuring compound stabilities, a small-scale subcritical water treatment meth...

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Autores principales: Chiou, Tai-Ying, Nomura, Shiori, Konishi, Masaaki, Liao, Chien-Sen, Shimotori, Yasutaka, Murata, Miki, Ohtsu, Naofumi, Kohari, Yoshihito, Lee, Wei-Ju, Tsai, Tsung-Yu, Nagata, Yuichi, Saitoh, Tohru
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7221780/
https://www.ncbi.nlm.nih.gov/pubmed/32331471
http://dx.doi.org/10.3390/molecules25081953
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author Chiou, Tai-Ying
Nomura, Shiori
Konishi, Masaaki
Liao, Chien-Sen
Shimotori, Yasutaka
Murata, Miki
Ohtsu, Naofumi
Kohari, Yoshihito
Lee, Wei-Ju
Tsai, Tsung-Yu
Nagata, Yuichi
Saitoh, Tohru
author_facet Chiou, Tai-Ying
Nomura, Shiori
Konishi, Masaaki
Liao, Chien-Sen
Shimotori, Yasutaka
Murata, Miki
Ohtsu, Naofumi
Kohari, Yoshihito
Lee, Wei-Ju
Tsai, Tsung-Yu
Nagata, Yuichi
Saitoh, Tohru
author_sort Chiou, Tai-Ying
collection PubMed
description Thermal stabilities of four major components (l-menthol, l-menthone, piperitone, and l-menthyl acetate) of Japanese mint essential oil were evaluated via subcritical water treatment. To improve experimental throughput for measuring compound stabilities, a small-scale subcritical water treatment method using ampoule bottles was developed and employed. A mixture of the four major components was treated in subcritical water at 180–240 °C for 5–60 min, and then analyzed by gas chromatography. The results indicated that the order of thermal resistance, from strongest to weakest, was: l-menthyl acetate, l-menthol, piperitone, and l-menthone. In individual treatments of mint flavor components, subsequent conversions of l-menthyl acetate to l-menthol, l-menthol to l-menthone, l-menthone to piperitone, and piperitone to thymol were observed in individual treatments at 240 °C for 60 min. As the mass balance between piperitone and thymol was low, the hydrothermal decomposition of the components was considered to have occurred intensely during, or after the conversion. These results explained the degradation of mint essential oil components under subcritical water conditions and provided the basis for optimizing the extraction conditions of mint essential oils using subcritical water.
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spelling pubmed-72217802020-05-21 Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment Chiou, Tai-Ying Nomura, Shiori Konishi, Masaaki Liao, Chien-Sen Shimotori, Yasutaka Murata, Miki Ohtsu, Naofumi Kohari, Yoshihito Lee, Wei-Ju Tsai, Tsung-Yu Nagata, Yuichi Saitoh, Tohru Molecules Article Thermal stabilities of four major components (l-menthol, l-menthone, piperitone, and l-menthyl acetate) of Japanese mint essential oil were evaluated via subcritical water treatment. To improve experimental throughput for measuring compound stabilities, a small-scale subcritical water treatment method using ampoule bottles was developed and employed. A mixture of the four major components was treated in subcritical water at 180–240 °C for 5–60 min, and then analyzed by gas chromatography. The results indicated that the order of thermal resistance, from strongest to weakest, was: l-menthyl acetate, l-menthol, piperitone, and l-menthone. In individual treatments of mint flavor components, subsequent conversions of l-menthyl acetate to l-menthol, l-menthol to l-menthone, l-menthone to piperitone, and piperitone to thymol were observed in individual treatments at 240 °C for 60 min. As the mass balance between piperitone and thymol was low, the hydrothermal decomposition of the components was considered to have occurred intensely during, or after the conversion. These results explained the degradation of mint essential oil components under subcritical water conditions and provided the basis for optimizing the extraction conditions of mint essential oils using subcritical water. MDPI 2020-04-22 /pmc/articles/PMC7221780/ /pubmed/32331471 http://dx.doi.org/10.3390/molecules25081953 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chiou, Tai-Ying
Nomura, Shiori
Konishi, Masaaki
Liao, Chien-Sen
Shimotori, Yasutaka
Murata, Miki
Ohtsu, Naofumi
Kohari, Yoshihito
Lee, Wei-Ju
Tsai, Tsung-Yu
Nagata, Yuichi
Saitoh, Tohru
Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment
title Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment
title_full Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment
title_fullStr Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment
title_full_unstemmed Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment
title_short Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment
title_sort conversion and hydrothermal decomposition of major components of mint essential oil by small-scale subcritical water treatment
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7221780/
https://www.ncbi.nlm.nih.gov/pubmed/32331471
http://dx.doi.org/10.3390/molecules25081953
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