Seasonal variation of Thymus hyemalis Lange and Spanish Thymus vulgaris L. essential oils composition

Jordán, María J.; Martı́nez, Rosa; Goodner, Kevin; Baldwin, Elizabeth A.; Sotomayor, J. A.

doi:10.1016/j.indcrop.2006.06.011

Cited by 112 publications

(77 citation statements)

References 14 publications

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“…HDs obtained by conventional distillation contained linalool with a percentage between 2.3% and 3.2% and the other HDs group obtained by adapted distillation does not have this molecule but has carvacrol from 7.1% to 9.4%, molecule which is missing in the first group. The content differences between TvDCEOs and TvDFEOs showed that the 2 distillation methods used in our research can also have an impact on EO chemical composition as Jordan et al 1 showed in their research on Thymus vulgaris and T. hyemalis, in which they underscore the relationship between the phenological stage and the dynamic of the sequence ϒ-terpinene → p-cymene → thymol.…”

Section: Resultssupporting

confidence: 53%

Phytochemical, antioxidant and antimicrobial parameters of essential oils and hydrosols of colombian Thyme and Rosemary obtained using two different steam distillation methods

Hay¹,

Sierra²,

Tellez³

et al. 2015

Intl J Phyto Natu Ingrd

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Section: Resultssupporting

confidence: 53%

Phytochemical, antioxidant and antimicrobial parameters of essential oils and hydrosols of colombian Thyme and Rosemary obtained using two different steam distillation methods

Hay¹,

Sierra²,

Tellez³

et al. 2015

Intl J Phyto Natu Ingrd

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“…The chemical composition of plant essential oils may vary according to species, part of the plant, season of harvesting and geographical origin [10,24]. In addition, the extraction methods can also influence the type and amount of molecules extracted [2,14].…”

Section: Discussionmentioning

confidence: 99%

Fragrance Chemicals in the Essential Oil of Mentha arvensis Reduce Levels of Mental Stress

Cho

Sowndhararajan²,

Jung³

et al. 2013

Journal of Life Science

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The aim of this work was to determine the chemical composition of essential oil from aerial partsof Mentha arvensis L. f. piperascens (MAO) and to evaluate the effect of its fragrant chemicals on electroencephalographic (EEG) activity of human brain. The MAO was obtained by supercritical CO2 extraction. The maximum yield was 2.38% at conditions of 70ºC and 200 bar. There were 32 volatile chemicals with 6 alcohols (67.11%), 13 hydrocarbons (17.05%), 9 esters (11.50%), 2 ketones (7.16%), 1 oxide (2.77%), and 1 aldehyde (0.56%). The major components were (Z,Z,Z)-9,12,15-octadecatrien-1-ol (50.06%), 2-hydroxy-4-methoxyacetophenone (7.50%), and 3,4-dihydro-8-hydroxy-3-methyl-1H-2-benzopyran-1-one (6.60%). Results of the EEG study showed that inhalation of MAO significantly changed the EEG power spectrum values of relative gamma, relative fast alpha, and spectral edge frequency 90%. During the inhalation of MAO, the value of relative fast alpha was significantly increased (p<0.05). On the other hand, the values of gamma and the spectral edge frequency 90% were significantly decreased (p<0.05). The present study suggests that fragrant chemicals of essential oil of M. arvensis reduce the level of mental stress and that they could be used in the treatment of psychophysiological disorders.

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“…[15] Regarding the essential oil yield and the components that defi ne the quality of the oil, the most appropriate period for Thymus hyemalis harvesting is between full bloom and full bloom/beginning of fruit maturation, since this is the period beyond which the sequence of precursors and their fi nal component, γ-terpinene → p-cymene → thymol begins, and the yield and phenolic components reach their highest concentrations at this phenological stage. [16] As for coriander (Coriandrum sativus) fruits, the composition of the essential oil obtained in diff erent stages of maturity revealed great diff erences occurring during the maturation process. [17] The increase of the monoterpene alcohols fraction, concomitant with a marked increase of linalool, may be linked, in quality and in quantity, with the maturity stages.…”

Section: Physiological Factorsmentioning

confidence: 99%

Raw materials: the importance of quality and safety. A review.

Salgueiro

Martins

Correia

2010

Flavour & Fragrance J

107

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Aromatic plants and spices are used throughout the world for fl avouring food and beverages, as well as for food supplements, novel foods and as a source of essential oils and aromatic extracts. The non-availability or inadequacy of standards for checking and assuring the quality of aromatic plants and spices is one of the main problems that arise for industry when using such raw materials. As many aromatic plants are harvested from the wild, standardization to assure their quality is important for their safe and eff ective utilization in food and beverage industries. On the other hand, there are numerous parameters that infl uence the chemical composition of plants, which play an important role in the fi nal quality of the product and possibly in any risk arising to the consumer. Also, from a safety point of view, aromatic plants and spices should be free of undeclared contaminants and adulterants, such as toxic botanicals, pathogenic microorganisms and excessive levels of microbial toxins, pesticides or fumigation agents. We focus on these aspects and examine ways to assure their appropriate utilization from the quality and safety standpoint. The regulatory situation of medicinal and aromatic plants (MAPs) is very complicated; several diff erences in standards and regulations between countries can be found, a situation that can result in more health risks arising for consumers. To clarify some of the existing problems, the major regulations of the USA and the European Union (EU) and the borderlines between food supplements and medicines and other international standards, are briefl y described and discussed.

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Seasonal variation of Thymus hyemalis Lange and Spanish Thymus vulgaris L. essential oils composition

Cited by 112 publications

References 14 publications

Phytochemical, antioxidant and antimicrobial parameters of essential oils and hydrosols of colombian Thyme and Rosemary obtained using two different steam distillation methods

Phytochemical, antioxidant and antimicrobial parameters of essential oils and hydrosols of colombian Thyme and Rosemary obtained using two different steam distillation methods

Fragrance Chemicals in the Essential Oil of Mentha arvensis Reduce Levels of Mental Stress

Raw materials: the importance of quality and safety. A review.

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