Abstract
The content and composition of essential oils in leaves of Mentha × piperita L., M. spicata L., M. arvensis L., and M. longifolia (L.) Huds. from Estonia were investigated using hydrodistillation and GC–MS analyses. Some chemosystematic markers for the identification of Mentha species are presented. The essential oil yield of the studied species was 2.4–3.0%, 0.9–2.3%, 0.9–1.4%, and 0.7–2.5%, respectively. From the isolated essential oils, 75, 89, 67, and 69 compounds were identified and quantitatively evaluated, representing 92.2–99.5% of the total oil. The main constituents of M. × piperita oils were menthol (26.4–47.7%) and menthone (13.6–31.9%); the ratio of their content was usually between 1 and 3. Four chemotypes of M. spicata were determined: rich in carvone (62.1–67.4%), rich in piperitenone oxide (61.9%), rich in α-terpinyl acetate + trans-b-caryophyllene (61.9% and 11.4%, respectively), and rich in acetic acid,1-methyl-1-(4-methyl-5-oxo-cyclohex-3-enyl) ethyl ether (6.5%). The last two chemotypes were determined for the first time. Only the essential oils of M. arvensis were found to contain trans-1-octen-3-ol (3.8-7.7%) and neryl propionate (2.4% in both samples). Good chemosystematic markers for M. arvensis were also trans- (16.0–19.1%) and cis-b-ocimene (16.0–20.5%). The ocimene-rich chemotype was found by us for the first time. The chemosystematics of M. longifolia was found to be the most complicated, as many chemotypes have been determined by us and several other authors. In this study, a high concentration of carvone (51.4–57.6%) was characteristic of all analysed M. longifolia samples.
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Claims 20
Claim · model-written summary
Essential oil yield of Mentha × piperita L. was 2.4–3.0%.
Verbatim
e0“The essential oil yield of the studied species was 2.4–3.0%, 0.9–2.3%, 0.9–1.4%, and 0.7–2.5%, respectively.”
e1“The content and composition of essential oils in leaves of Mentha × piperita L., M. spicata L., M. arvensis L., and M. longifolia (L.) Huds. from Estonia”
Claim · model-written summary
Essential oil yield of M. spicata L. was 0.9–2.3%.
Verbatim
e0“The essential oil yield of the studied species was 2.4–3.0%, 0.9–2.3%, 0.9–1.4%, and 0.7–2.5%, respectively.”
e1“The content and composition of essential oils in leaves of Mentha × piperita L., M. spicata L., M. arvensis L., and M. longifolia (L.) Huds. from Estonia”
Claim · model-written summary
Essential oil yield of M. arvensis L. was 0.9–1.4%.
Verbatim
e0“The essential oil yield of the studied species was 2.4–3.0%, 0.9–2.3%, 0.9–1.4%, and 0.7–2.5%, respectively.”
e1“The content and composition of essential oils in leaves of Mentha × piperita L., M. spicata L., M. arvensis L., and M. longifolia (L.) Huds. from Estonia”
Claim · model-written summary
Essential oil yield of M. longifolia (L.) Huds. was 0.7–2.5%.
Verbatim
e0“The essential oil yield of the studied species was 2.4–3.0%, 0.9–2.3%, 0.9–1.4%, and 0.7–2.5%, respectively.”
e1“The content and composition of essential oils in leaves of Mentha × piperita L., M. spicata L., M. arvensis L., and M. longifolia (L.) Huds. from Estonia”
Claim · model-written summary
75 essential-oil compounds were identified in Mentha × piperita L..
Verbatim
e0“From the isolated essential oils, 75, 89, 67, and 69 compounds were identified and quantitatively evaluated, representing 92.2–99.5% of the total oil.”
e1“The content and composition of essential oils in leaves of Mentha × piperita L., M. spicata L., M. arvensis L., and M. longifolia (L.) Huds. from Estonia”
Claim · model-written summary
89 essential-oil compounds were identified in M. spicata L..
Verbatim
e0“From the isolated essential oils, 75, 89, 67, and 69 compounds were identified and quantitatively evaluated, representing 92.2–99.5% of the total oil.”
e1“The content and composition of essential oils in leaves of Mentha × piperita L., M. spicata L., M. arvensis L., and M. longifolia (L.) Huds. from Estonia”
Claim · model-written summary
67 essential-oil compounds were identified in M. arvensis L..
Verbatim
e0“From the isolated essential oils, 75, 89, 67, and 69 compounds were identified and quantitatively evaluated, representing 92.2–99.5% of the total oil.”
e1“The content and composition of essential oils in leaves of Mentha × piperita L., M. spicata L., M. arvensis L., and M. longifolia (L.) Huds. from Estonia”
Claim · model-written summary
69 essential-oil compounds were identified in M. longifolia (L.) Huds..
Verbatim
e0“From the isolated essential oils, 75, 89, 67, and 69 compounds were identified and quantitatively evaluated, representing 92.2–99.5% of the total oil.”
e1“The content and composition of essential oils in leaves of Mentha × piperita L., M. spicata L., M. arvensis L., and M. longifolia (L.) Huds. from Estonia”
Claim · model-written summary
menthol was a main constituent of peppermint oil at 26.4–47.7%.
Verbatim
e0“The main constituents of M. × piperita oils were menthol (26.4–47.7%) and menthone (13.6–31.9%); the ratio of their content was usually between 1 and 3.”
Claim · model-written summary
menthone was a main constituent of peppermint oil at 13.6–31.9%.
Verbatim
e0“The main constituents of M. × piperita oils were menthol (26.4–47.7%) and menthone (13.6–31.9%); the ratio of their content was usually between 1 and 3.”
Claim · model-written summary
A M. spicata chemotype was rich in carvone (62.1–67.4%).
Verbatim
e0“Four chemotypes of M. spicata were determined: rich in carvone (62.1–67.4%), rich in piperitenone oxide (61.9%), rich in α-terpinyl acetate + trans-b-caryophyllene (61.9% and 11.4%, respectively), and rich in acetic acid,1-methyl-1-(4-methyl-5-oxo-cyclohex-3-enyl) ethyl ether (6.5%).”
Claim · model-written summary
A M. spicata chemotype was rich in piperitenone oxide (61.9%).
Verbatim
e0“Four chemotypes of M. spicata were determined: rich in carvone (62.1–67.4%), rich in piperitenone oxide (61.9%), rich in α-terpinyl acetate + trans-b-caryophyllene (61.9% and 11.4%, respectively), and rich in acetic acid,1-methyl-1-(4-methyl-5-oxo-cyclohex-3-enyl) ethyl ether (6.5%).”
Claim · model-written summary
A M. spicata chemotype was rich in α-terpinyl acetate (61.9%).
Verbatim
e0“Four chemotypes of M. spicata were determined: rich in carvone (62.1–67.4%), rich in piperitenone oxide (61.9%), rich in α-terpinyl acetate + trans-b-caryophyllene (61.9% and 11.4%, respectively), and rich in acetic acid,1-methyl-1-(4-methyl-5-oxo-cyclohex-3-enyl) ethyl ether (6.5%).”
Claim · model-written summary
A M. spicata chemotype was rich in trans-b-caryophyllene (11.4%).
Verbatim
e0“Four chemotypes of M. spicata were determined: rich in carvone (62.1–67.4%), rich in piperitenone oxide (61.9%), rich in α-terpinyl acetate + trans-b-caryophyllene (61.9% and 11.4%, respectively), and rich in acetic acid,1-methyl-1-(4-methyl-5-oxo-cyclohex-3-enyl) ethyl ether (6.5%).”
Claim · model-written summary
A M. spicata chemotype was rich in acetic acid,1-methyl-1-(4-methyl-5-oxo-cyclohex-3-enyl) ethyl ether (6.5%).
Verbatim
e0“Four chemotypes of M. spicata were determined: rich in carvone (62.1–67.4%), rich in piperitenone oxide (61.9%), rich in α-terpinyl acetate + trans-b-caryophyllene (61.9% and 11.4%, respectively), and rich in acetic acid,1-methyl-1-(4-methyl-5-oxo-cyclohex-3-enyl) ethyl ether (6.5%).”
Claim · model-written summary
Only M. arvensis oil contained trans-1-octen-3-ol at 3.8-7.7%.
Verbatim
e0“Only the essential oils of M. arvensis were found to contain trans-1-octen-3-ol (3.8-7.7%) and neryl propionate (2.4% in both samples).”
Claim · model-written summary
Only M. arvensis oil contained neryl propionate at 2.4%.
Verbatim
e0“Only the essential oils of M. arvensis were found to contain trans-1-octen-3-ol (3.8-7.7%) and neryl propionate (2.4% in both samples).”
Claim · model-written summary
trans- was a chemosystematic marker for M. arvensis at 16.0–19.1%.
Verbatim
e0“Good chemosystematic markers for M. arvensis were also trans- (16.0–19.1%) and cis-b-ocimene (16.0–20.5%).”
Claim · model-written summary
cis-b-ocimene was a chemosystematic marker for M. arvensis at 16.0–20.5%.
Verbatim
e0“Good chemosystematic markers for M. arvensis were also trans- (16.0–19.1%) and cis-b-ocimene (16.0–20.5%).”
Claim · model-written summary
All analyzed M. longifolia samples had high carvone concentration.
Verbatim
e0“In this study, a high concentration of carvone (51.4–57.6%) was characteristic of all analysed M. longifolia samples.”