Menthol (also known as mint camphor) is a cyclic monoterpene alcohol which is found as a major constituent in the essential oils of Mentha species and responsible for the distinctive smell and flavour of the plant. Menthol is a major essential oil constituent of a very limited number of aromatic plants, known to exhibit various biological properties. Extraction of Mentha arvensis essential oils under different extraction conditions causes the change in essential oil components. In the present review different extraction conditions have been discussed in order to get the maximum yield of mint essential oil as well as menthol. Almost 81% menthol is extracted by hydrodistillation method at temperature condition of 30o C. Steam distillation and microwave extraction have also been used to extract menthol under temperature conditions of 35 to 40 oC and below 70 oC. Isolation of menthol from extracted essential oils can be done by various methods such as fractional distillation and chromat.
See Full PDF See Full PDFEssential oils and their components are especially important due to their utilisation in foodstuffs, cosmetics, pharmaceuticals and in medicine, being accepted as "safe" products by consumers. This paper's purpose was to obtain essential oil of spearmint (Mentha spicata L.) by microwave-assisted hydrodistillation. Hydrodistillation was carried out at atmospheric and reduced pressures, with dried spearmint, with or without enzymatic pretreatment. The effect of enzymatic pretreatment and pressure on the efficiency of the extraction process was observed. The analysis of the volatile components was carried out by GC-MS (the headspace method for the dried plant and liquid injection for the extracted essential oils).
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Flavour and Fragrance Journal
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Food and Bioprocess Technology
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American Journal of Plant Sciences
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Menthapiperita is one of the important traditional medicinal plants widely used in pharmaceuticals, cosmetic, food and flavor industries and belongs to the labiatae family. The plant in this family is widely used to improve concentration and memory level. Altering the extraction methods of economically important mentha oil may allow raising the engineer composition, increasing the rate of oil's extraction with lesser energy demand. The experiment was performed to model higher mentha oil yield as the function of distinct operating parameter. The intent of this work was to differentiate the three extraction method-Solvent free extraction method, Microwave assisted hydro distillation and hydro distillation in term of high yield of peppermint oil with less energy consumption. This experiment was designed to evaluate the interaction of significant parameters such as solvent to raw material ratio, extraction time and microwave power on the yield of mentha piperita oil. The material used in this work includes the fresh leaves of mentha piperita. The extractions by microwave assisted hydro distillation were done on the power of 200W, 250W and 300W; the ratio of solvent and raw material to be extracted (4:1, 6:1, 8:1, 10:1) and extraction time was 30, 60, 90 and 120 min. whereas extraction by SFME method were done on same power level at constant load of plant matter in the same level of extraction time. From the results, the maximum yield of peppermint oil was achieved from solvent free microwave extraction method with 1.02% yield at 250W in 90min. And SFME method was discovered to be the best method in the term of yield as it compared with other two methods 0.98% of yield in 90 min from MAHD method and 0.97% of yield from HD after 4.5 hour of distillation time). Therefore, SFME is considered to be the new green technology for extracting oil as a more energy saver, money saver and clean process. Testing of volatile compounds present in extracted peppermint oil was investigated by Gas Chromatography and mass spectrometry. And testing has confirmed that there is no effect of extraction technique on the main constituents of oil as the content of menthol compound was noticeably same. From the experimental work SFME proved as a superior and green method for the extraction of higher essentials oil with lesser energy required.
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International Food Research Journal
