Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment
Thermal stabilities of four major components (<i>l</i>-menthol, <i>l</i>-menthone, piperitone, and <i>l</i>-menthyl acetate) of Japanese mint essential oil were evaluated via subcritical water treatment. To improve experimental throughput for measuring compound st...
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doaj-dba90ff469434c0592bb9e533bd3a9002020-11-25T02:24:43ZengMDPI AGMolecules1420-30492020-04-01251953195310.3390/molecules25081953Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water TreatmentTai-Ying Chiou0Shiori Nomura1Masaaki Konishi2Chien-Sen Liao3Yasutaka Shimotori4Miki Murata5Naofumi Ohtsu6Yoshihito Kohari7Wei-Ju Lee8Tsung-Yu Tsai9Yuichi Nagata10Tohru Saitoh11School of Regional Innovation and Social Design Engineering, Kitami Institute of Technology, Koen-cho, Kitami, Hokkaido 090-8507, JapanDepartment of Biotechnology and Environmental Chemistry, Kitami Institute of Technology, Koen-cho, Kitami, Hokkaido 090-8507, JapanSchool of Regional Innovation and Social Design Engineering, Kitami Institute of Technology, Koen-cho, Kitami, Hokkaido 090-8507, JapanDepartment of Biological Science and Technology, I Shou University, Yanchao District, Kaohsiung 824–45, TaiwanSchool of Regional Innovation and Social Design Engineering, Kitami Institute of Technology, Koen-cho, Kitami, Hokkaido 090-8507, JapanSchool of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, Koen-cho, Kitami, Hokkaido 090–8507, JapanSchool of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, Koen-cho, Kitami, Hokkaido 090–8507, JapanSchool of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, Koen-cho, Kitami, Hokkaido 090–8507, JapanSchool of Food Safety, Taipei Medical University, Xinyi District, Taipei 110–31, TaiwanDepartment of Food Science, Fu Jen Catholic University, Xinzhuang District, New Taipei City 242–05, TaiwanKitami Hakka Tsusho Co., Ltd., Oroshi-machi, Kitami, Hokkaido 090–0056, JapanSchool of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, Koen-cho, Kitami, Hokkaido 090–8507, JapanThermal stabilities of four major components (<i>l</i>-menthol, <i>l</i>-menthone, piperitone, and <i>l</i>-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: <i>l</i>-menthyl acetate, <i>l</i>-menthol, piperitone, and <i>l</i>-menthone. In individual treatments of mint flavor components, subsequent conversions of <i>l</i>-menthyl acetate to <i>l</i>-menthol, <i>l</i>-menthol to <i>l</i>-menthone, <i>l</i>-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.https://www.mdpi.com/1420-3049/25/8/1953subcritical water treatmentmint essential oilconversionhydrothermal decompositionthymol |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tai-Ying Chiou Shiori Nomura Masaaki Konishi Chien-Sen Liao Yasutaka Shimotori Miki Murata Naofumi Ohtsu Yoshihito Kohari Wei-Ju Lee Tsung-Yu Tsai Yuichi Nagata Tohru Saitoh |
spellingShingle |
Tai-Ying Chiou Shiori Nomura Masaaki Konishi Chien-Sen Liao Yasutaka Shimotori Miki Murata Naofumi Ohtsu Yoshihito Kohari Wei-Ju Lee Tsung-Yu Tsai Yuichi Nagata Tohru Saitoh Conversion and Hydrothermal Decomposition of Major Components of Mint Essential Oil by Small-Scale Subcritical Water Treatment Molecules subcritical water treatment mint essential oil conversion hydrothermal decomposition thymol |
author_facet |
Tai-Ying Chiou Shiori Nomura Masaaki Konishi Chien-Sen Liao Yasutaka Shimotori Miki Murata Naofumi Ohtsu Yoshihito Kohari Wei-Ju Lee Tsung-Yu Tsai Yuichi Nagata Tohru Saitoh |
author_sort |
Tai-Ying Chiou |
title |
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_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_sort |
conversion and hydrothermal decomposition of major components of mint essential oil by small-scale subcritical water treatment |
publisher |
MDPI AG |
series |
Molecules |
issn |
1420-3049 |
publishDate |
2020-04-01 |
description |
Thermal stabilities of four major components (<i>l</i>-menthol, <i>l</i>-menthone, piperitone, and <i>l</i>-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: <i>l</i>-menthyl acetate, <i>l</i>-menthol, piperitone, and <i>l</i>-menthone. In individual treatments of mint flavor components, subsequent conversions of <i>l</i>-menthyl acetate to <i>l</i>-menthol, <i>l</i>-menthol to <i>l</i>-menthone, <i>l</i>-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. |
topic |
subcritical water treatment mint essential oil conversion hydrothermal decomposition thymol |
url |
https://www.mdpi.com/1420-3049/25/8/1953 |
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