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1

Plant essential oils and their role in the control of winter oilseed rape pests

100%
Duda M., Dubert F.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
2010
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tom 545
The quantity of the crop plant pests have to be under control. A defense against pest organisms with toxic chemicals has been the prevailing pest control strategy for over 50 years. However, plants were found to possess insecticidal properties. Several essential oils act as antifeedants, deterrents and repellents. Essential oils are products of the secondary metabolism in plants. They are mixtures of simple and volatile compounds. One of the example is lavender oil, which repels Ceutorhynchus sp. - the most important pests of Brassica napus var. oleifera plants. The same effect was observed in the case when linalool, linalyl acetate (main components of lavender oil) and lavandulol were applied [Duda, Dubert 2008a, 2008b]. Thymol, the major constituent of thyme oil, is also a deterrent for the lepidopteran pest - Plutella xylostella L. [Akhtar, Isman 2004].
2
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The effectiveness of several compounds against Varroa destructor - preliminary research in Podlaskie Province

100%
Kruszewski M. A., Naumowicz M.
Acta Scientiarum Polonorum. Zootechnica
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2018
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tom 17
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nr 1
3

Seasonal variation in abiotic factors and toxicity of thymol against the snail Lymnaea acuminata

100%
Srivastava S., Kumar P., Singh V. K., Singh D. K.
Journal of Biology and Earth Sciences
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2013
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tom 03
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nr 1
4

Microbial transformation of citral by Penicillium sp.

80%
Esmaeili A., Tavassoli A.
Acta Biochimica Polonica
|
2010
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tom 57
|
nr 3
 Thymol is present in the essential oils from herbs and spices, such as thyme. It is produced by these plant species as a chemical defense against phytopathogenic microorganisms. Therefore, this compound has attracted great attention in food industry, i.e., it has been used as a natural preservative in foods such as cheese to prevent fungal growth. Previous studies concerning the biotransformation of nerol by Penicillium sp. and microbial transformation of citral by sporulated surface cultures method (SSCM) of Penicillium digitatum have been reported. The objective of this research was to study the pathway involved during biotransformation of citral by Penicillium sp. using two methods. The culture preparation was done using different microbial methods and incubation periods to obtain Penicillium for citral biotransformation. The biotransformation products were identified by gas chromatography (GC) and gas chromatography/mass spectroscopy (GC/MS). A comparison of the two methods showed that SSCM was more effective, its major products were thymol (21.5 %), geranial (18.6 %) and nerol (13.7 %). LM produced only one compound - thymol - with a low efficiency.
5

Lysine efficiency in piglets fed diets with a phytogenic feed additive and conclusion of lysine requirement data

80%
Muhl A., Liebert F.
Journal of Animal and Feed Sciences
|
2010
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tom 19
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nr 1
49-58
Two experiments were conducted to examine effects of a commercial phytogenic feed additive (PFA), containing inulin, an essential oil mix (carvacrol, thymol), and chest nut meal (polyphenols) on nutrient digestibility, protein utilization, and lysine efficiency in piglets. Each experiment utilized sixteen piglets (male castrated, 8 wk) and four experimental groups. Experiment 1 studied graded levels of the PFA (0, 0.05, 0.1, 0.15%) in lysine limited diets (wheat, barley, soyabean meal, fish meal). Experiment 2 examined 0.1% of the PFA and two dietary levels of lysine. The results indicated that apparent nutrient digestibility, protein utilization, and lysine efficiency were not significantly affected by the PFA (P>0.05). Observed daily lysine requirements (7.3, 9.9 and 13.1 g for 76, 100, 124 g daily protein deposition) in growing barrows (20-30 kg body weight) were in line with recommendations and contribute to the limited database for modelling of lysine requirements in piglets.
6

Differential antitumor effect of essential oils and their major components of Thymus broussonettii: relationship to cell cycle and apoptosis induction

80%
Jaafari A., Ait Mouse H., Ait M'Bark L., Tilaoui M., Elhansali M., Lepoivre M., Aboufatima R., Melhaoui A., Chait A., Zyad A.
Herba Polonica
|
2009
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tom 55
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nr 2
36-50
Thymus broussonettii, a Moroccan endemic plant, exists in two chemotypes. The aim of our study is to compare the cytotoxic activity of their essential oils and major products as well as their effect on cell cycle and apoptosis induction. The chemical composition analysis of essential oils by GC-SM revealed that the lasts are rich and diverse and the major products of the chemotypes TbA and TbE are carvacrol and thymol, respectively. The in vitro cytotoxic effect study against five tumor cell lines shows that TbA essential oil, rich in carvacrol, has an important cytotoxic effect, higher than that of TbE, rich in thymol. This result is confirmed by comparing cytotoxic effect of carvacrol and thymol. Furthermore, TbA EO /carvacrol and TbE EO /thymol induce cell cycle arrest at S and G0/G1 phases, respectively. On the other hand, carvacrol, most cytotoxic in vitro, was studied for its effect on solid tumor in vivo and apoptosis-induction. Our results show that carvacrol, administred by gavage, has an important effect on solid tumor and induce apoptosis in P815 tumor cell line.
7
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Antibacterial activity of Zataria multiflora essential oil and its main components against Pseudomonas aeruginosa

80%
Mahboubi M., Heidarytabar R., Mahdizadeh E.
Herba Polonica
|
2017
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tom 63
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nr 3
Introduction: In Iranian traditional medicine, Zataria multiflora Boiss (Lamiaceae family) is reputed due to its antiseptic effects. Objective: The purpose of this study was to evaluate the antibacterial and biofilm killing effects of Z. multiflora essential oil and main components against Pseudomonas aeruginosa. Methods: The main components of essential oil were identified by gas chromatography (GC) and gas chromatography–mass spectrometry (GC-MS). The antibacterial properties of Z. multiflora oil and main components were determined by assessing the MIC and MBC values, and their inhibition percent of biofilm killing effects were determined by the evaluation of optical density. The role of each main component in these activities was determined according to the chemical profiles of essential oil. Results: Thymol (38.7%), carvacrol (30.6%), and p-cymene (8.3%) were main components of twenty five components of essential oil. Carvacrol had the higher role in antibacterial activity against P. aeruginosa, followed by thymol. P-cymene enhanced the antibacterial activities of thymol and carvacrol against P. aeruginosa. Carvacrol showed the weak role in biofilm killing effect. In spite of the low antibacterial activity of p-cymene against P. aeruginosa, it can enhance the antibacterial activity of thymol or carvacrol. Conclusion: Z. multiflora essential oil can be used for the management of P. aeruginosa infections. Determining the precise role of each components needs investigating in their behavior in different media.
8
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Rodzaj Thymus L. - walory aromatyczne i lecznicze. Przegląd wybranych gatunków

80%
Nurzynska-Wierdak R., Chrapek A.
Annales Horticulturae
|
2022
|
tom 31
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nr 2
9

Antimicrobial activity of essential oil from Oliveria decumbens and its synergy with vancomycin against Staphylococcus aureus

80%
Mahboubi M., Mohammadi-Yeganeh S., Bokaee S., Dehdashti H., Feizabadi M. M.
Herba Polonica
|
2007
|
tom 53
|
nr 4
Oliveria decumbens Vent (Umbelliferae) is a shrub commonly found in the South-East of Iran. Its aerial section is extensively used in herbal medicine. The Disk Diffusion Test and Microbroth Dilution Assay were used to determine the antimicrobial activity of the essential oil from Oliveria decumbens Vent against Staphylococcus aureus. To detect synergy, vancomycin was added to Mueller-Hinton agar at sub-inhibitory concentrations and the inhibitory zones were recorded in millimeters. The main components of oil were thymol (22%), carvacrol (22%) and p-cymene (19%). The O. decumbens oil exhibited strong antistaphylococcal activity (18.0±0.86). Carvacrol was considerably more effective (29.8±1.5) than thymol (17.2±1.13) and p-cymene (0.0±0.0) against Staphylococcus aureus. The oil presented strong synergism with vancomycin (24.9±0.75 vs. 19.3±0.54, p<0.001). However, further studies are required to evaluate its in vivo efficacy.
10

Analysis of chemical composition of essential oil in the herb of thyme [Thymus vulgaris L.] grown in South-Eastern Poland

70%
Zawislak G.
Herba Polonica
|
2007
|
tom 53
|
nr 3
The experiment was conducted in the years 2004-2005. The aim of the study was to determine the chemical composition of essential oils from garden thyme herb in the first year of cultivation. Essential oil was achieved in distillation with water vapor according to Polish Pharmacopoeia VI. Qualitative and quantitative composition of essential oils was analyzed using gas chromatography combined with mass spectroscopy technique (GC/MS). The analysis revealed the presence of 37 chemicals in essential oil made of thyme, including one unidentified. Thymol, a-terpinene, p-cymene and carvacrol were the main components of essential oil achieved from garden thyme cultivated in south­eastern Poland.
11
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Badania nad wpływem fenoli na biogenezę wodną przy zastosowaniu Daphnia magna jako wskaźnika

51%
Cabejszek I., Just J.
Roczniki Państwowego Zakładu Higieny
|
1959
|
tom 10
|
nr 1
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