Seasonal variation of Thymus piperella L. essential oil composition. Relationship among γ-terpinene, p-cymene and carvacrol

IF 2.2 3区农林科学 Q3 CHEMISTRY, APPLIED

Journal of Essential Oil Research Pub Date : 2022-08-13 DOI:10.1080/10412905.2022.2103191

J. Llorens-Molina, S. Vacas, Natalia Escrivá, M. Verdeguer

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Abstract

ABSTRACT A wild population of Thymus piperella L. was monitored for two years in order to correlate phenological stages and meteorological data with yield and, essential oil (EO) composition. The plant material was extracted by hydrodistillation and the EO was submitted to GC-MS and GC-FID analysis. To achieve reliable quantification, relative response factors were applied. The results showed a progressive increase in the proportion of carvacrol according to the sunlight duration and temperature increase, until reaching a maximum at the beginning of flowering stage (52.9 % and 41.0 % in 2018 and 2019, respectively). A simultaneous decrease was found in the amount of p-cymene (8.2 % and 12.8 % respectively) in the same stage, whereas -terpinene showed a similar evolution to that observed for carvacrol but with lower values (3.3 % - 14.6 %). From statistical analysis, significant changes in the relative proportions of carvacrol and its metabolic precursors: γ-terpinene and p-cymene were found. They have been explained based on the proposed metabolic pathways in the literature. On the other hand, when relating the changes in the EO profiles with rainfall data, a strong influence of the water supply on the evolution of the chemical composition was observed.

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麝香精油成分的季节变化。γ-萜烯、对伞花烃和香芹酚的关系

摘要对野生百里香(thyymus piperella L.)种群进行了为期两年的监测，以确定其物候期和气象数据与产量和精油成分的相关性。采用加氢蒸馏法提取植物材料，并进行气相色谱-质谱和气相色谱- fid分析。为了获得可靠的定量，应用了相关响应因子。结果表明，随着日照时间的延长和温度的升高，香芹酚的比例逐渐增加，并在开花初期达到最大值(2018年和2019年分别为52.9%和41.0%)。在同一时期，对伞花烃的含量同时下降(分别为8.2%和12.8%)，而-萜烯的含量与香芹酚的含量变化相似，但含量较低(3.3% ~ 14.6%)。通过统计分析，发现香芹酚及其代谢前体γ-萜烯和对伞花烃的相对比例发生了显著变化。它们是根据文献中提出的代谢途径来解释的。另一方面，当将EO剖面的变化与降雨资料联系起来时，观察到供水对化学成分演变的强烈影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Essential Oil Research 工程技术-食品科技

CiteScore

6.00

自引率

3.30%

发文量

审稿时长

18-36 weeks

期刊介绍： Journal of Essential Oil Research ( JEOR) is the major forum for the publication of essential oil research and analysis. Each issue includes studies performed on the chemical composition of some of the 20,000 aromatic plants known in the plant kingdom. JEOR is devoted entirely to all phases of research from every corner of the world by the experts in their field. JEOR''s main areas of focus include: -Analytical chemistry- Biological activity- Biotechnology- Chemical composition- Chemical synthesis- Chemosystematics- Microbiological activity- Plant biochemistry/biosynthesis- Toxicology. Published six times per year, JEOR provides articles on the aromatic principles of a plant or its isolates and are directed toward furthering our readers'' knowledge of the aromatic plant and animal kingdoms.