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Olejek tymiankowy w zastosowaniach leczniczych i kosmetycznych (składniki chemiczne i aktywność biologiczna)

Walasek-Janusz Magdalena, Cichosz Patrycja, Nurzyńska-Wierdak Renata

Wiadomości Chemiczne

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2024

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[Z] 78, 11-12

1731--1748

EN

Essential oils - aromatic plant substances with strong biological activity - are increasingly used in pharmaceutical and cosmetic production. An example of an extremely active essential oil is thyme essential oil, obtained by steam distillation of thyme herb. Thyme oil has proven antibacterial, antifungal, and antiviral activity. It is also characterized by strong antioxidant activity, as well as anti-inflammatory, antispasmodic, and repellent properties. The biological activity of thyme oil and its possible applications depend on the origin of the raw material and the extraction method. Thymol and carvacrol are mentioned as the most active compounds of thyme oil, although other ingredients are also mentioned. The intended therapeutic effects can be achieved by using pure, natural oil and proper application. In cosmetic production, thyme oil can act as an active ingredient of the product and/or a natural preservative that extends its shelf life.

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The Stimulating Effect of Plant Extracts on Tomato Cultivation

Abbad Zineb, Rhebbar Fatima-Zahra, Mekaoui Fatima-Zahra, Tahiri Nor El Houda, Bengueddour Rachid, Lrhorfi Lalla Aicha

Ecological Engineering & Environmental Technology

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2024

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Vol. 25, iss. 11

365--376

EN

As it might be known, organic products are increasingly in demand. Indeed, one of the most environmentally and friendly innovations are the bio stimulants. Their effect is exposed on the flowering, the plant growth, the fruits and the crop productivity and nutrient use efficiency. In this study we evaluate the effect of two aqueous plant extracts Ocimum basilicum and Eucalyptus globulus on the growth and the performances of tomato. The methodology consist on two parts of evaluation: the effect on the plant performances and the quality of the fruit. At the same time the composition of the two plant extracts have been necessary to evaluate the compound responsible on the effects. The results showed that both aqueous extracts had a positive effect on the plant performances. Indeed, Ocimum basilicum-treated seedling reached 1.35 ± 0.05 cm at the high 50% concentration. Compared with 1.02 ± 0.16 cm for the negative control. Same for Eucalyptus globulus that reached 1.35 ± 0.25 cm at the same dose. For the circumference of the seedlings, the same extract reached 8 ± 0.93cm at the highest concentration. The number of flowers per fruits had a positive effect for two plant extracts. For the quality of the fruit, a positive effect had been evaluated on the fruit weight that reached 121 ± 24 g with 8% of Ocimum basilicum and 135 ± 15 g with Eucalyptus globulus. Same for circumference; PH; the titrable acidity and the total Carbohydrate. At the same time, it had a negative effect on the total juice that has decreased by the aggregate of the concentrations. It had a neutral effect on the coloration of the fruit that didn’t change by the application of the plants extracts. The phytochemical screening of the plant extracts showed that both Ocimum basilicum and Eucalyptus globulus are high in polyphenols that might be the reason of these positive impacts. This study showed that it is possible to use the plant extracts of Ocimum basilicum and Eucalyptus globulus as biostimulant to have a better production and productivity of tomatoes.

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Influence of Harvest Time and Environmental Factors on the Yield and Chemical Composition of Rosemary (Rosmarinus officinalis L.) Essential Oil in Northeast Morocco

Farhani Faouzi, El Aboudi Ahmed, Boujraf Amal, Dallahi Youssef

Ecological Engineering & Environmental Technology

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2024

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Vol. 25, iss. 11

1--17

EN

Assessment of the dynamics of rosemary (Rosmarinus officinalis L) is essential in the production of essential oils (EOs) in Morocco, considering the country is one of the main producers of rosemary EO. In this study, the authors aimed to examine the influence of harvesting period and environmental factors on the dynamics of rosemary EO, mainly its composition. Samples were collected from four sites in northeastern Morocco on a monthly basis between July 2021 and June 2022. Subsequently, quantitative and qualitative analyses by hydrodistillation and gas chromatography were performed to determine the yield and composition of EOs. On average, EO yields ranged from 2.3 to 3% across the four sites; they were highest in summer and lowest in autumn. A moderate negative correlation (r = -0.59, p < 0.05) was observed between precipitation and EO yield, while temperature had a moderately positive influence. A total of 17 chemical compounds, representing 88.9–99.1% of the EO extracts, were identified and consisted mainly of 1,8-cineole (44.2–46.6%), camphor (14.8–16.8%), borneol (7.5–9.1%), and α-pinene (5.2–5.9%). Harvesting period strongly influenced EO composition, with the highest concentrations of 1,8-cineole and α-pinene were recorded during the summer period (July and August), while the concentrations of borneol, camphor, and terpineol were highest in winter (December and January) and late spring. The findings of the study highlight the importance of monitoring the factors that influence the chemical composition of rosemary EO, thus providing a knowledge base that would help improve the quality and economic value of rosemary EO production in the region.

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Study of Drought Effects on Three Medicinal and Aromatic Plants Using Field Spectroscopy

El Azizi Sarah, Amharref Mina, Bernoussi Abdes-Samed

Journal of Ecological Engineering

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2022

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Vol. 23, nr 12

155--162

EN

Water deficit is one of the major environmental issues affecting biodiversity. Drought-related works are conducted to explore the mechanisms involved in drought vulnerability or resistance and to adopt the most advantageous tool to monitor these changes. Field spectroscopy, an accessory tool of remote sensing, evaluates the reflectance to collect continuous spectrum from materials. In the conducted study, the potential of using UV-Near infrared (NIR) spectroscopy as a non-destructive and reliable approach in monitoring of drought effects on three Medicinal and Aromatic Plants species (MAPs): Lavandula stoechas, Cistus laurifolius and Pistacia lentiscus from Northern Morocco during dry (July 2021) and wet (March 2022) period was addressed. It was found that Lavandula stoechas species is more impacted by water deficit than Cistus laurifolius and Pistacia lentiscus. Indeed, this species has a lower reflectance in Visible and NIR regions of the spectrum after a period of drought and therefore a higher vulnerability to water deficit than the other two species.