Recovery of Mint Essential Oil through Pressure-releasing Distillation during Subcritical Water Treatment

2019 ◽  
Vol 25 (6) ◽  
pp. 793-799 ◽  
Author(s):  
Tai-Ying Chiou ◽  
Masaaki Konishi ◽  
Shiori Nomura ◽  
Yasutaka Shimotori ◽  
Miki Murata ◽  
...  
Keyword(s):  
Water Treatment ◽  
Essential Oil ◽  
Subcritical Water

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

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 1953
Author(s):  
Tai-Ying Chiou ◽  
Shiori Nomura ◽  
Masaaki Konishi ◽  
Chien-Sen Liao ◽  
Yasutaka Shimotori ◽  
...  
Keyword(s):  
Water Treatment ◽  
Essential Oil ◽  
Subcritical Water ◽  
Treatment Method ◽  
Small Scale ◽  
Thermal Stabilities ◽  
Flavor Components ◽  
Japanese Mint ◽  
Water Conditions ◽  
Oil Components

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.

Characteristics of Japanese Mint Extracts Obtained by Subcritical-water Treatment

2019 ◽  
Vol 25 (5) ◽  
pp. 695-703 ◽  
Author(s):  
Shiori Nomura ◽  
Wei-Ju Lee ◽  
Masaaki Konishi ◽  
Tohru Saitoh ◽  
Miki Murata ◽  
...  
Keyword(s):  
Water Treatment ◽  
Subcritical Water ◽  
Japanese Mint

scholarly journals Properties of Extract from Okara by Its Subcritical Water Treatment

2013 ◽  
Vol 16 (5) ◽  
pp. 974-982 ◽  
Author(s):  
Jintana Wiboonsirikul ◽  
Masayuki Mori ◽  
Pramote Khuwijitjaru ◽  
Shuji Adachi
Keyword(s):  
Water Treatment ◽  
Subcritical Water

scholarly journals Structural Changes in Milled Wood Lignin (MWL) of Chinese Quince (Chaenomeles sinensis) Fruit Subjected to Subcritical Water Treatment

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 398
Author(s):  
Wen-Yue Wang ◽  
Zhao Qin ◽  
Hua-Min Liu ◽  
Xue-De Wang ◽  
Jing-Hao Gao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Water Treatment ◽  
Quantum Coherence ◽  
Structural Changes ◽  
31P Nmr ◽  
Subcritical Water ◽  
Water Extraction ◽  
Subcritical Water Extraction ◽  
Milled Wood Lignin ◽  
Chinese Quince

Subcritical water treatment has received considerable attention due to its cost effectiveness and environmentally friendly properties. In this investigation, Chinese quince fruits were submitted to subcritical water treatment (130, 150, and 170 °C), and the influence of treatments on the structure of milled wood lignin (MWL) was evaluated. Structural properties of these lignin samples (UL, L130, L150, and L170) were investigated by high-performance anion exchange chromatography (HPAEC), FT-IR, gel permeation chromatography (GPC), TGA, pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), 2D-Heteronculear Single Quantum Coherence (HSQC) -NMR, and 31P-NMR. The carbohydrate analysis showed that xylose in the samples increased significantly with higher temperature, and according to molecular weight and thermal analysis, the MWLs of the pretreated residues have higher thermal stability with increased molecular weight. The spectra of 2D-NMR and 31P-NMR demonstrated that the chemical linkages in the MWLs were mainly β-O-4′ ether bonds, β-5′ and β-β′, and the units were principally G- S- H- type with small amounts of ferulic acids; these results are consistent with the results of Py-GC/MS analysis. It is believed that understanding the structural changes in MWL caused by subcritical water treatment will contribute to understanding the mechanism of subcritical water extraction, which in turn will provide a theoretical basis for developing the technology of subcritical water extraction.

scholarly journals Antioxidant Characteristics of Extracts from Cereal Residues by Their Subcritical Water Treatment

2012 ◽  
Vol 61 (9) ◽  
pp. 465-468 ◽  
Author(s):  
Yusuke Murayama ◽  
Jintana Wiboonsirikul ◽  
Pramote Khuwijitjaru ◽  
Takashi Kobayashi ◽  
Shuji Adachi
Keyword(s):  
Water Treatment ◽  
Subcritical Water ◽  
Antioxidant Characteristics ◽  
Cereal Residues

Hydrolysis of bamboo biomass by subcritical water treatment

2015 ◽  
Vol 191 ◽  
pp. 244-252 ◽  
Author(s):  
Mood Mohan ◽  
Tamal Banerjee ◽  
Vaibhav V. Goud
Keyword(s):  
Water Treatment ◽  
Subcritical Water ◽  
Hydrolysis Of
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