P-cymene Research Articles

The therapeutic potential and molecular mechanism of Alpha-pinene, Gamma-terpinene, and P-cymene against melanoma cells

The purpose of this study is to investigate the potential anticarcinogenic effects of three phytochemicals, namely Alpha-pinene (AP), Gamma-terpinene (GT), and P-cymene (PC), on melanoma cells (A2058 cell line). Additionally, the study aims to explore the synergistic activities of these phytochemicals with Dacarbazine, a chemotherapy drug. To understand the molecular mechanism involved in apoptosis induction in the A-2058 cell line, it was used AO/EB staining for apoptosis detection and cell cycle analysis, monitored through flow cytometry. It also determined the mRNA expression levels of different apoptosis-regulatory genes, including p53, Bax, NF-kB, Bcl-2, Bcl-xl, and caspase-3. The antitumor activities of these phytochemicals and their combinations were investigated in a subcutaneous mouse tumor model. The tumor diameter was 21.4 ± 1.1 mm in the Dacarbazine treatment group and 42.4 ± 3.1 mm in the control group. The antitumoral activities of AP and PC in the tumor model were similar to those of Dacarbazine. On the other hand, GT exhibited remarkable antitumoral activity, with a 1.75-fold reduction in tumor diameter compared to the Dacarbazine group. When different combinations of phytochemicals and Dacarbazine were used, the GT plus Dacarbazine treatment group was found to have a 3.5-fold reduction in tumor diameter compared to the Dacarbazine group. The tumor diameters in the Dacarbazine, AP plus GT, GT plus Dacarbazine, and AP plus Dacarbazine treatment groups were 21.4 ± 1.1, 7.6 ± 2.2, 8.6 ± 0.5, and 6.2 ± 1.9 mm, respectively.

Do essential oils suppress potato sprout growth?

Worldwide, potatoes are an essential food crop; however, substantial post-harvest losses due to sprouting during storage have been a significant issue. Chemical sprout suppressants have been widely used to extend potato dormancy and reduce or eliminate sprouting in storage. However, chlorpropham (CIPC), the most effective and the most widely used chemical suppressant worldwide has been banned in the European Union and other countries due to potential health and environmental risks. Essential oils (EOs) from various plants have been investigated and are being used as environmentally friendly alternatives to synthetic chemical suppressors. This study aimed to investigate EOs that were not previously tested for preventing potato sprout suppression at room temperature. The objective of this study was to evaluate the effects of twenty EOs in three potato cultivars, Ranger Russet, Terra Rosa, and TrailBlazer minitubers, on the suppression of sprouts at room temperature. The results showed that Cinnamomum camphora (L.) J. Presl and Origanum majorana L. EOs suppressed sprouting in all potato cultivars throughout the storage period while maintaining potato quality during storage. Furthermore, Lavandula x intermedia Emeric ex Loisel. EO showed the ability to shorten and restrict sprouts relative to the controls. The GC analysis of C. camphora EO identified eight constituents with linalool being the dominant one at 95.5 %, whereas the main EO constituents of O. majorana were terpinen-4-ol (40.3 %), γ-terpinene (14.6 %), sabinene (7.2 %), α-terpinene (6.9 %), para cymene (6.2 %), and limonene (4.1 %) in addition to other compounds. 1,8-Cineole and linalool were the major compounds in L. x intermedia EO. This work is the first report on these specific EOs as sprout suppressors. These EOs offer a potential for environmentally safe substitutes to conventional sprout inhibitors for potato storage and could be utilized in the development of commercial products for potato sprout control at room temperature.

Establishment of a headspace-thermal desorption and gas chromatography-mass spectrometry method (HS-TD-GC-MS) for simultaneous detection of 51 volatile organic compounds in human urine: Application in occupational exposure assessment

Volatile organic compounds (VOCs) are a group of ubiquitous environment pollutants especially released into the workplace. Assessment of VOCs exposure in occupational populations is therefore a crucial issue for occupational health. However, simultaneous biomonitoring of a variety of VOCs is less studied. In this study, a simple and sensitive method was developed for the simultaneous determination of 51 prototype VOCs in urine by headspace-thermal desorption coupled to gas chromatography-mass spectrometry (HS-TD-GC-MS). The urinary sample was pretreated with only adding 0.50 g of sodium chloride to 2 mL of urine and 51 VOCs should be determined with limits of detection (LODs) between 13.6 ng/L and 24.5 ng/L. The method linearity ranged from 0.005 to 10 μg/L with correlation coefficients (r) of 0.991 to 0.999. The precision for intraday and inter-day, measured by the variation coefficient (CV) at three levels of concentration, was below 15 %, except for 4-isopropyl toluene, dichloromethane, and trichloromethane at low concentration. For medium and high levels, recoveries of all target VOCs were within the standard range, but 1,1-dichloropropene and styrene, which were slightly under 80 % at low levels. In addition, the proposed method has been used to determine urine samples collected in three times (before, during and after working) from 152 workers at four different factories. 41 types of prototype VOCs were detected in workers urine. Significant differences (Kruskal-Wallis chi-squared = 117.18, df = 1, P < 0.05) in the concentration levels of VOCs between the exposed and unexposed groups were observed, but not between the three sampling times (Kruskal-Wallis chi-squared = 3.39, df = 2, P = 0.183). The present study provides an alternative method for biomonitoring and assessing mixed exposures to VOCs in occupational populations.

Herbicidal Potential of the Natural Compounds Carvacrol, Thymol, Eugenol, p-Cymene, Citral and Pelargonic Acid in Field Conditions: Indications for Better Performance

In recent years, interest in natural products with herbicidal activity as new tools for integrated weed management has increased. The European Union is demanding a reduction in the number of herbicides used, forbidding use of the most toxic ones, despite the problem of weed resistance increasing. Pelargonic acid (PA) is the only natural herbicide available in Spain. In this work, two field assays were performed with the natural compounds carvacrol (CAR), citral (CIT), eugenol (EUG), thymol (THY), p-cymene (P-CYM), (PA), and the combination of PA with CIT—all except P-CYM formulated by Seipasa—to test their herbicidal efficacy in real conditions. They were compared with commercial PA, glyphosate (GLY) and oxyfluorfen (OXY). In both experiments, GLY achieved the best weed control. Considering the natural herbicides, PA formulated by Seipasa and PA plus CIT were the most effective. From both experiments, some conclusions can be extracted for better herbicidal performance of natural products: (1) use products on sensitive weed species, (2) treat weeds at earlier phenological stages, (3) find the active doses in field conditions, (4) cover weeds well when treating, (5) ensure adequate formulation of products, and (6) develop a strategy for correct application.

Synthesis and Characterization of Mesoporous Silica Nanoparticles Loaded with P-Cymene against Rice Bacterial Blight

Mesoporous silica nanoparticles (MSNs) can be used as carrier materials for the controlled release of pesticides while reducing their negative environmental impact. In this study, we screened an active ingredient, p-cymene (PC), with an excellent inhibitory effect on rice bacterial blight. Subsequently, the PC was successfully loaded onto MSNs via physisorption (PC@MSNs). PC@MSNs, characterized by a regular spherical shape, smooth surface, and an MSN average size of 262.9 nm, achieved an 8.6% drug loading capacity. The release kinetics of the PC from the PC@MSNs demonstrated a sustained release (288 h) pattern influenced by drug diffusion. The efficacy of the PC@MSNs against Xanthomonas oryzae pv. Oryzae paralleled those of PC. Acute toxicity assays revealed that the PC@MSNs were less toxic to aquatic life (LC50 = 257.867 mg/L) and that the formulation showed no adverse effects on rice seedling growth. In summary, these results suggest that PC@MSNs can broaden PC’s scope of application in managing rice diseases.

Antinociceptive Effect of a p-Cymene/β-Cyclodextrin Inclusion Complex in a Murine Cancer Pain Model: Characterization Aided through a Docking Study.

Pain is one of the most prevalent and difficult to manage symptoms in cancer patients, and conventional drugs present a range of adverse reactions. The development of β-cyclodextrins (β-CD) complexes has been used to avoid physicochemical and pharmacological limitations due to the lipophilicity of compounds such as p-Cymene (PC), a monoterpene with antinociceptive effects. Our aim was to obtain, characterize, and measure the effect of the complex of p-cymene and β-cyclodextrin (PC/β-CD) in a cancer pain model. Initially, molecular docking was performed to predict the viability of complex formation. Afterward, PC/β-CD was obtained by slurry complexation, characterized by HPLC and NMR. Finally, PC/β-CD was tested in a Sarcoma 180 (S180)-induced pain model. Molecular docking indicated that the occurrence of interaction between PC and β-CD is favorable. PC/β-CD showed complexation efficiency of 82.61%, and NMR demonstrated PC complexation in the β-CD cavity. In the S180 cancer pain model, PC/β-CD significantly reduced the mechanical hyperalgesia, spontaneous nociception, and nociception induced by non-noxious palpation at the doses tested (p < 0.05) when compared to vehicle differently from free PC (p > 0.05). Therefore, the complexation of PC in β-CD was shown to improve the pharmacological effect of the drug as well as reducing the required dose.

Analysis of the volatile profiles of kiwifruits experiencing soft rot using E-nose and HS-SPME/GC–MS

Soft rot is a postharvest storage disease occurring in kiwifruit that can cause substantial losses and is difficult to detect. In this study, the internal quality of kiwifruits was measured. In addition, the volatile profiles of kiwifruits were analysed by electronic nose (E-nose) and headspace solid-phase microextraction coupled with gas chromatography–mass spectrometry (HS–SPME/GC–MS). The results showed that the firmness, titratable acidity (TA) and ascorbic acid (AA) decreased as the rot worsened, while malondialdehyde increased. A principal component analysis (PCA) of the E-nose data showed a clear distinction between the intact and diseased fruits. A loading analysis (LOA) of the E-nose data showed that the sensor response appeared to significantly vary between the intact and diseased fruits. Nine differential metabolites for the intact and diseased kiwifruits were acquired by HS–SPME/GC–MS, including isobutyl butyrate, ethyl 2-furoate, ethyl valerianate, propyl butyrate, ethyl hexanoate, 4-terpene alcohols, benzyl alcohol, oxime-methoxy-phenyl and 4-isopropyl toluene. There was a significant correlation (p < 0.05) between the physicochemical indices and volatile profiles obtained by E-nose and HS-SPME/GC–MS. This study proved that the combination of E-nose and GC–MS could potentially be used for detecting kiwifruits experiencing soft rot.

167 VOLATILE ORGANIC COMPOUND PROFILING FOR DETECTION OF ESOPHAGEAL CANCER IN EXHALED BREATH

Abstract Endoscopic surveillance for Barrett’s esophagus (BE) is invasive but remains the standard modality for early diagnosis of esophageal adenocarcinoma (EAC) and intervention. Human breath contains an array of volatile organic compounds (VOC) that change in disease conditions. VOC detection provides a potential source of biomarkers for non-invasive, real-time identification of EAC. This study aimed to characterize a VOC-profile applicable to the detection of EAC and to provide pilot data to design a future validation trial. Methods Breath samples were collected in our endoscopy unit from BE, EAC, and control patients. Samples were collected in FlexFoil bags (SKC ltd) using previously standardized methods. Hydrogen, methane and other VOCs were quantified by QuinTron BreathTracker® and selected-ion flow tube mass spectrometry (SIFT-MS, Syft®) respectively. 250 reported cancer-related VOCs were selected for analysis. Non-parametric tests were used to identify candidate VOCs, and logistic regression analysis was then applied to determine the best predictors for EAC. Receiver Operating Characteristic (ROC) Curves were developed to determine the sensitivity and specificity of the model. Results 68 individuals were enrolled in the study (Controls, n = 37; BE, n = 21; EAC, n = 10). 8 VOCs were identified with significant concentration differences between the three groups: Trimethylbenzene (3 iso-forms), Dimethyl Sulfide, 4-isopropyl toluene, 1-butanol, trichloroethylene, hydrogen sulfide, methyl mercaptan, p-isopropenyl toluene. Logistic regression analysis of these 10 compounds demonstrated predictive probability of EAC from other groups with ROC curves calculating an area under the curve of 0.85. Conclusion Previous studies have supported the utility of VOCs in exhaled breath as non-invasive real-time tests for the identification of some other cancer types. This pilot study has identified potential VOCs which might identify individuals with EAC. A larger study will be needed to validate and confirm these findings.

Aromatic profile changes of Thai mangoes during heat processing

In Thailand, mango is economically one of the most important fruits. Mango flesh has a very short shelf life and is therefore subjected to processing such as juicing and drying. Thermal processing leads to physiochemical or phytochemical changes including in fruit aromatic profiles. The research aim of this study was to investigate the effect of heat on free volatile aromas of mango fruits and to identify descriptive profiles from the ripe pulp of four Thai cultivars viz. ‘Sam-pee’, ‘Chok-Anan’, ‘Mahachanok’ and ‘Kaew’. Ripe mango flesh was analyzed for free volatile aroma by automated Solid-phase Microextraction (SPME) before and after heating at 85°C for 15 min. The SPME results showed that Thai mango flesh before and after heat treatment comprised typical aromatic compounds of pine (i.e., α-pinene, β-pinene, terpinolene cis-β-ocimene), herbs (i.e., β-phellandrene, phellandrene, eucalyptus), flowers (i.e., sabinene, β-myrcene, para cymene, trans-β-ocimene) and citrus fruit (i.e., D-3-carene, α-terpinene, limonene, ϒ-terpinene). Heating altered these major aromatic compositions in all four Thai cultivars. Similar alteration patterns were also observed by sensory evaluations. The results of this research will be utilized to standardise mango processing and to benefit future food-product development.

P-Cymene attenuates cancer pain via inhibitory pathways and modulation of calcium currents

BackgroundOncological pain is one of the most prevalent and difficult-to-treat symptoms in patients with cancer. p-Cymene (PC) is a monoterpene found in more than 100 different plant species, endowed with various pharmacological properties—particularly antinociceptive. Hypothesis/PurposePC has antinociceptive effect in a model of oncologic pain due to the activation of the descending inhibitory pathway of pain. Study DesignA pre-clinical, longitudinal, blind and randomized study. MethodsMale Swiss mice were induced with S180 cells in the right hind paw, then treated daily with PC (12.5, 25 and 50 mg/kg, s.c.) and screened for mechanical hyperalgesia, spontaneous nociception, nociception induced by non-noxious palpation, tumor growth, changes in the neuromuscular function and existence of bone degradation in the tumor area. The effect of PC on Ca2+ currents (electrophysiological records), histological and neurochemical changes (immunofluorescence for Fos) were also evaluated. ResultsPC reduced (p < 0.05) the mechanical hyperalgesia, the spontaneous (p < 0.001) and non-noxious palpation (p < 0.001) nociceptions, not changing the tumor development, neuromuscular function or histopathological aspects of the paw affected. PC reduced Fos expression in the spinal cord (p < 0.001) and increased this expression in the PAG (p < 0.05) and in the NRM (p < 0.01). PC decreased the density of calcium channel currents (p < 0.05). ConclusionThese results suggest the antinociceptive effect of PC on oncologic pain, probably acting in both ascending and descending pain pathways, and modulating the calcium channel currents in order to exert its effects.

PRODUCTION OF p-CYMENE BY ALKYLATION OF TOLUENE WITH PROPAN-2-OL

PRODUCTION OF p-CYMENE BY ALKYLATION OF TOLUENE WITH PROPAN-2-OL

Bioactivity of Wild Carrot (Daucus carota, Apiaceae) Essential Oil Against Mosquito Larvae.

Invasive alien plants wreak havoc on native ecosystems and using them as a source of biopesticides could improve their management. We examined the toxicity of essential oil of wild carrot (also known as 'Queen Anne's Lace', Daucus carota Linnaeus), an aggressive invader throughout the United States, against Aedes aegypti L., Culex pipiens L., and Culex restuans Theobald larvae. Comparisons were made between essential oil extracted from umbels of local populations of wild carrot versus a commercial brand. Methyl isoeugenol (60.7%) was by far the most abundant constituent in commercial brand oil, whereas α-pinene (33.0%) and β-pinene (25.8%) were the dominant constituents in essential oil extracted from local wild carrot populations. The commercial brand essential oil was significantly more toxic to Cx. restuans larvae (LC50 = 44.4 ppm) compared with Cx. pipiens (LC50 = 51.0 ppm) and Ae. aegypti (LC50 = 54.5 ppm). Essential oil from local populations of wild carrot was significantly more toxic to both Cx. pipiens (LC50 = 42.9) and Cx. restuans (LC50 = 40.3) larvae compared with Ae. aegypti (LC50 = 64.6 ppm) larvae. Three of the nine tested chemical constituents of wild carrot essential oil (terpinolene, para cymene, and γ-terpinene) were consistently more toxic to larvae of the three mosquito species than the whole essential oil. These findings suggest that exploiting wild carrot essential oil and its chemical constituents as a biopesticide for mosquito control could be used as part of multifaceted approaches for controlling this invasive alien plant species.

Essential oil composition of two Thymus kotschyanus Boiss. varietes from Elazığ (Turkey)

In this study aerial parts essential oil of T. kotschyanus Boiss. & Hohen. var. kotschyanus and T. kotschyanus Boiss. & Hohen. var. glabrescens Boiss. were analyzed by HS-SPME/GC-MS. As a result forty one and thirty nine components were identified representing 90.4% and 89.3% of the oil, respectively. Thymol (31.2%), carvacrol (19.5%), p-cymene (11.2%) and γ-terpinene (8.4%) were detected the main compounds of T. kotschyanus var. kotschyanus; thymol (26.3%), carvacrol (24.3%) and p-cymene (17.6%) were detected the major constituents of T. kotschyanus var. glabrescens. With this study, chemotypes of studied taxa were detected carvacrol and thymol. In addition studied plant samples were found to be rich in respect to essential oils and the results discussed natural product, renewable resources and chemotaxonomy.

Essential oil composition of two Origanum L. taxa from Bingol (Turkey)

In this study aerial parts of the essential oils of Origanum acutidens L. and Origanum vulgare L. subsp. gracile (K. Koch) Ietswaart taxa were analyzed by HS-SPME/GC-MS. As a result forty one and thirty seven components were identified representing 89.7% and 90.4% of the oil, respectively. Carvacrol (37.5%), thymol (22.7%) and p-cymene (7.6%) were detected as main compounds of O. acutidens; carvacrol (30.8%), thymol (26.8%) and γ-terpinene (12.1%) were detected as the major constituents of O. vulgare subsp. gracile. With this study, chemotypes of studied taxa were identified as carvacrol and thymol. Additionly, the studied plant samples were found to be rich in essential oils. The results are discussed in respect to natural products, renewable resources and chemotaxonomy.

Rapid Determination of Volatile Compounds of Satureja hortensis by Using the HSSPME-GC-MS Method

The volatile fractions were obtained from the fresh aerial parts of Satureja hortensis using head space solid phase micro extractiongas chromatography-mass spectrometry (HS-SPME-GC-MS) method and were immediately analyzed by means of GC and GC/ MS instruments. Eleven compounds were identified in the samples analyzed, representing 100% of the total composition. In terms of general categories,monoterpene hydrocarbons dominated the chemical profile (99.5%) with γ-terpinene (46.0%), p-cymene (11.8%), α-terpinene (11.1%), α-pinene (10.4%) and α-thujene (6.8%) as the main constituent components. The other constituents were found to be myrcene (5.2%), β-pinene (3.9%), o-cymene (2.6%), α-phellandrene (1.1%), camphene (0.6%) and thymol (0.5%). Accordingly, only 0.5% of the profile included oxygenated monoterpenes.

The anti-hyperalgesic and anti-inflammatory profiles of p-cymene: Evidence for the involvement of opioid system and cytokines

Context: Pain corresponds to the most frequent reason for visits to physicians, and its control by conventional drugs is accompanied by several side effects, making treatment difficult. For this reason, new chemical entities derived from natural products still hold great promise for the future of drug discovery to pain treatment.Objective: The objective of this study was to evaluate the antinociceptive and anti-inflammatory profiles of p-cymene (PC), a monocyclic monoterpene, and its possible mechanisms of action.Materials and methods: Mice treated acutely with PC (25, 50, or 100 mg/kg, i.p.) were screened for carrageenan-induced hyperalgesia and the inflammatory components of its cascade (30–180 min), carrageenan-induced pleurisy (4 h), and tail-flick test (1–8 h). Also, we observed the PC effect on the generation of nitric oxide by macrophages and the activation of neurons in the periaqueductal gray (PAG) by immunofluorescence.Results: PC reduced (p < 0.001) the hyperalgesia induced by carrageenan, TNF-α, dopamine, and PGE2. PC decrease total leukocyte migration (100 mg/kg: p < 0.01), neutrophils (50 and 100 mg/kg: p < 0.05 and 0.001), and TNF-α (25, 50, and 100 mg/kg: p < 0.01, 0.05, and 0.001, respectively), besides reducing NO production (p < 0.05) in vitro. PC produced antinociceptive effect in tail-flick test (p < 0.05), which was antagonized by naloxone, naltrindole, nor-BNI, and CTOP, and increased (p < 0.001) the number of c-Fos-immunoreactive neurons in PAG.Discussion and conclusion: These results provide information about the anti-hyperalgesic and anti-inflammatory properties of PC suggesting a possible involvement of the opioid system and modulating some pro-inflammatory cytokines.

P‐Cymene Complexed in β‐Cyclodextrin to Cancer Pain Control

p‐Cymene (PC) is an alkylbenzene commonly found in cumin oil which has shown antinociceptive activity in animal models. Now, we evaluated the effect of encapsulation of PC in β‐cyclodextrin (PC/β‐CD) on nociception induced by tumor cells (sarcoma 180) in rodents. PC/β‐CD complex was administered (12.5 ‐ 50 mg/kg, p.o.) in mice with tumor (106 cells/25 mL, s.c.) on the hind paw, which were evaluated regarding hyperalgesia (digital von Frey apparatus), spontaneous and palpation‐induced nociception. The experimental protocols were approved by UFS Ethic Committee (CEPA: 19/11). PC/β‐CD (12.5, 25 e 50 mg/kg) was able to reduce significantly hyperalgesia (p &lt; 0.001 or 0.05), and this effect was maintained for 24 hours after treatment. Oral administration of PC/β‐CD complex (12.5‐50 mg/kg) on alternate days also reduced spontaneous and nociception induced by palpation (p&lt;0.001 ‐ 0.05). Free PC (50 mg/kg, p.o.) and PC no complexed with β‐CD, were unable promote significant changes in nociceptive responses. Therefore, results obtained suggest the inclusion complex containing p‐cymene and β‐cyclodextrin may improve the pharmacological characteristics of terpenoids or related compounds with potential applicability in chronic pain, such as cancer.Financial support: FAPITEC‐SE and CNPq (Brazil).

Antimicrobial and efflux pumps inhibitory activities of Eucalyptus grandis essential oil against respiratory tract infectious bacteria

Essential oils obtained by hydrodistillation from the fresh and dry leaves of Eucalyptus grandis were analyzed by gas chromatography (GC) and gas chromatography mass spectrometry (GC-MS). The main components of the fresh leaf oil were α-pinene (29.6%), p-cymene (19.8%), 1,8-cineole (12.8%) and α-terpineol (6.4%). While, the dry leaf oil had 1,8-cineole (47.4%), limonene (13.3%), α-pinene (7.5%) and spathulenol (7.1%). The antimicrobial activities of the essential oils were tested against respiratory tract infectious microorganisms (Klebsiella pneumoniae, Staphylococcus aureus and Moraxella catarrhalis) using the microdilution-broth methods. The minimum inhibitory concentration and minimum bactericidal concentration values of the oils ranged between (0.31 to 1.25) mg/ml and (0.63 - >5) mg/ml respectively. The minimum bactericidal concentration values caused the release of cytosolic lactate dehydrogenase (membrane damage) which ranges from 8 to 24% in comparison with Triton-X-100. The accumulation of rhodamine 6G in bacterial cells showed that the essential oils were effective as efflux pump inhibitors. The results of this study support the use of the plant in folk medicine. Key words: Eucalyptus grandis, myrtaceae, essential oil, antimicrobial activity, efflux pump, R6G.

ChemInform Abstract: Ru‐Catalyzed Branched versus Linear Selective C3‐Alkylation of 2‐Aroylbenzofurans with Acrylates via C—H Activation.

AbstractThe carbonyl‐directed C3—H activation and alkylation of benzo[b]furans with acrylates occurs selectively either in a linear or branched fashion, depending on the catalyst employed; [Ru(p‐cymene)Cl2]2 or Ru(PPh3)3Cl2, respectively.

Antimicrobial profile of essential oils extracted from wild versus cultivated Origanum ehrenberjii against enteric bacteria.

The role of Origanum ehrenberjii against bacteria that cause enteric diseases is well known. Salmonella and Enterococcus cause high rates of enteric infections around the world. The aim of this study was to extract essential oils from cultivated and naturally growing O. ehrenberjii, compare the chemical profiles of the extracts and estimate their antimicrobial efficacy against enteric pathogens. Sixteen compounds were recovered consistently from essential oils extracted from O. ehrenberjii of wild and cultivated origin. The chemical profiles were determined using GC-MS. Safety of the essential oils was determined by observing mortality of chicks after intramuscular administration of the oils. The antimicrobial efficacy of the oils against the enteric pathogens was determined by the Kirby-Bauer Single Disk Diffusion assay. The levels of thymol, carvacrol, para cymene and γ-terpinene were significantly different in the two oils. A significant difference in in vitro antimicrobial activity of the two oils against Salmonella enterica serovar Typhimurium was observed. Intramuscular administration of the two oils in one day-old chicks resulted in significant differences in mortality of 60% vs. 5% (p < 0.05) for wild and cultivated herbs respectively, reflecting the higher safety of the cultivated herb due to the differences in the levels of certain active ingredients. The chemical profile of essential oil of wild vs. cultivated O. ehrenberjii differ significantly at compound level, suggesting the reason for their significant difference in efficacy against Salmonella enterica serovar Typhimurium, and also significant differences in the toxicity of the two oils.