Carvacrol Content Research Articles

Preparation and characterization of carvacrol/soybean protein isolate composite film with efficient antimicrobial and antioxidant activities and its application in grape preservation

There is an urgent need for a simple and effective method to enhance the freshness of fruits during transportation. In this study, we developed a composite antibacterial film (CAR film) using carvacrol and soy protein isolate (SPI). The mechanical properties, hydrophobicity, antibacterial activity, and antioxidant capacity of the film were characterized. The results demonstrated that, compared to the soy protein isolate film, the film with 2.5 % carvacrol content exhibited superior mechanical properties (tear strength decreased by approximately 37 %, elongation at break increased by about 108 %), hydrophobicity (water vapor permeability decreased by 38 %), antibacterial activity (inhibition zone diameters against E. coli and S. aureus were 14.21 mm and 11.83 mm, respectively), antioxidant capacity (increased by 5 to 6 times), and biocompatibility (cell survival rate exceeded 90 %). Grape preservation experiments further confirmed that the CAR film effectively prolongs shelf life. Therefore, CAR film is a promising packaging material for fruit preservation.

Biodegradable soy protein isolate carvacrol coating controls soft rot on nectarines by enhancing defense response

Nectarine fruits are rich in nutrients, which are susceptible to fungal infection during postharvest, resulting in quality deterioration and decay. This study aimed to assess the effect of different concentrations of carvacrol and soy protein isolate coatings on the fungal infection and quality characteristics of nectarines during postharvest storage. The results showed that soy protein isolate carvacrol (SPI-C) coating inhibited the growth of Rhizopus stolonifer in vitro. The SPI-C coating significantly reduced the incidence of postharvest soft rot, maintained the postharvest quality of nectarines during storage. SPI-C coating induces the defense response to soft rot by enhancing the accumulation of phenolic, flavonoids and lignin, and up-regulating the expression of defense-related genes in nectarines. The SPI-C coating activated the transcription of antioxidant enzymes (CAT, SOD and POD) and eliminated ROS damage. The disease resistance response promotes the production of defense-related substances by upregulating the gene expression of PpPPO and PpPAL. In summary, SPI-C coating significantly reduces the incidence of postharvest soft rot, maintains the postharvest quality and induces defense response to soft rot by enhancing the expression of genes involved in phenylpropanoid metabolism in nectarines during storage.

Influence of Plant Phenology on Chemical Composition of Monarda fistulosa L. Organs and their Bioactive Properties.

Monarda fistulosa L. above-ground organs, collected at three phases of plant phenology, were investigated as potential raw materials for application in the food industry. They were evaluated regarding essential oil (EO) content, composition, and antimicrobial activity, as well as characteristics of phenolic fractions and antioxidant properties, which may determine health benefits and potential use in food preservation. The dominant constituent of leaf EO was carvacrol. In the inflorescence EO carvacrol content was especially high at the full flowering phase (45.12%), while during the fruit setting phase its content was lower than that of p-cymene (39.75%) and thymoquinone (25.04%). In the agar dilution test, leaf and inflorescence EOs inhibited the growth of the six tested microorganisms at the concentration range of 0.156-0.625 µL/mL. Leaves collected at the vegetative phase of plant growth were characterised by the highest content of rosmarinic acid and didymin. Inflorescences harvested during the flowering of plants were rich in linarin. Flavonoid content was highly correlated with antioxidant activity of extracts. Due to these properties, M. fistulosa extracts and essential oils could be used in the food industry as natural preservatives or antioxidants, thereby contributing to the development of safer and more sustainable food products.

Antimicrobial potential of carvacrol against Edwardsiella piscicida in vitro

With the alarming rise of antibiotic-resistant bacteria, novel antibacterial substances are urgently needed for controlling and treating multidrug-resistant bacterial infections. Edwardsiella piscicida is an important zoonotic enteric pathogen, that can cause systemic hemorrhagic septicemia in fish. Carvacrol, a major terpene of oregano essential oil, has a wide range of antibacterial activities. This study aimed to analyze the effect of carvacrol on the growth and virulence of E. piscicida in vitro. The minimum inhibitory concentration (MIC) of carvacrol against E. piscicida was 125 μg/mL. The sub-inhibitory concentrations of carvacrol significantly decreased the biofilm formation of E. piscicida in a dose dependent manner, whereas increased the hemolytic activity with a negative correlation. The quantitative real-time PCR results showed that carvacrol at sub-MICs downregulated the expression of related virulence genes, including flagellum (fimA, fliC, flgN), hemolysins (ethA, ethB), quorum sensing systems (luxR, qseB), T3SS (esrB, esrC) and T6SS (evpB, evpC). Moreover, carvacrol (≤1/8 MIC) reduced the cytotoxicity, adherence and internalization activities of E. piscicida to the EPC cells. In vivo trial, the diet mixed with carvacrol increased the survival of zebrafish infected with E. piscicida. Overall, these findings suggested that carvacrol might be a promising therapeutic agent against E. piscicida infection in aquaculture.

ESSENTIAL OIL CONTENTS AND BIOLOGICAL ACTIVITIES OF THYMUS CANOVIRIDIS JALAS AND THYMUS SIPYLEUS BOISS.

Objective: Members of the Lamiaceae family are considered to be major sources of bioactive therapeutic agents. Many of them are important medicinal and aromatic plants used in traditional and modern medicine and in the food, cosmetic and pharmaceutical industries. The aim of this study was to investigate in detail the biological activities and chemical composition of the essential oils of Thymus canoviridis Jalas and Thymus sipyleus Boiss. species belonging to the genus Thymus, one of the most important genera of the Lamiaceae family. Material and Method: The essential oil content of the species was determined by GC-MS. Antioxidant activities of the essential oils were determined using lipid peroxidation, DPPH free radical, ABTS cation radical and CUPRAC methods. In addition, cytotoxic activities against breast cancer (MCF-7) and colon cancer (HT-29) cell lines and anticholinesterase (against AChE and BChE enzymes), urease, tyrosinase, elastase, collagenase and angiotensin converting enzyme inhibition activities were determined. Result and Discussion: When the essential oil composition of T. sipyleus was analyzed, the major compounds were 1,8-cineole (eucalyptol) (18.16%), camphor (15.08%) and endo-borneol (11.63%), while T. canoviridis was found to be rich in carvacrol (72.88%). T. canoviridis showed high antioxidant activity in lipid peroxidation (IC50: 45.72±0.12 μg/ml), ABTS (IC50: 6.12±0.03 μg/ml) and CUPRAC (IC50: 5.31±0.01 μg/ml) methods. The selectivities of T. canoviridis and T. sipyleus species against MCF-7 cell line were 4.39 and 6.81, respectively. In the enzyme inhibition studies, both Thymus species showed moderate inhibition activity against BChE enzyme (Inhibition%: 57.88±1.14, 39.21±0.89, respectively). In addition, T. sipyleus showed moderate inhibition of elastase enzyme (Inhibition%: 25.33±0.79). When the results are evaluated in general, it can be said that T. canoviridis essential oil with its rich carvacrol content and high cytotoxic and antioxidant activity can be preferred as a safer and natural option instead of synthetic preservatives in food, pharmaceutical and cosmetic industries to extend shelf life and ensure food safety.

Unravelling the impact of drought and salt stresses on Thymus pannonicus: Morpho-physiological and biochemical insights

This research assesses the effects of drought and salt stresses applied individually or in combination on Thymus pannonicus, a resilient perennial herb native to the Pannonian vegetation region. Our experiment aimed to comprehensively evaluate morphological, physiological, and biochemical parameters of the thyme subjected to two levels of soil water capacity (SWC) - 70 % (control and salt stress) and 40 % (drought stress and combined stresses) - along with two salinity levels, 0 mM NaCl (control and drought stress) and 60 mM NaCl (salt stress and combined stresses). The plants exhibited significant responses to all the studied parameters under 40 % SWC in both treatments, demonstrating notable reductions in shoot and root parameters. In contrast, salt treatment at 60 mM had a minimal impact on growth. A stability in photosynthetic pigment composition was observed in all treatment, whereas a notable decrease (p < 0.05) in relative water content was seen in drought-stressed treatments compared to the to the control. Essential oil contents were higher in the control (0.91 ml/100g DW) but significantly declined (p < 0.05) under drought stress and combined stresses conditions (0.49 ml/100g DW and 0.53 ml/100g DW respectively). Particularly, the GC-MS analysis revealed a significant decrease (p < 0.05) in thymol and carvacrol content for the drought-stressed treatments. Substantial reductions were evident for the total polyphenol concentration and antioxidant capacity under the combined stress treatment, measuring 101.49 mg GAE/g DW and 106.57 AAE/g DW, respectively. Interestingly, the HPLC analysis indicated the highest levels of rosmarinic acid and caffeic acid in the drought-stressed treatment, while the lowest ones were recorded in the combined stress treatment. These findings indicated the responses of Thymus pannonicus to environmental stressors, emphasizing the need for further investigations for a comprehensive understanding of salinity effects.

Carvacrol alters the membrane phospholipids in erythromycin-resistant Streptococcus pyogenes

BackgroundPhospholipids are significant constituents of bacterial membranes. Bacteria can alter their cytoplasmic membrane fatty acid composition in response to changing environmental stress conditions. Carvacrol, a mono-terpenoid phenol, has excellent antibacterial properties against Streptococcus pyogenes. PurposeThis study examined modifications of the membrane phospholipid composition in the presence of sublethal carvacrol concentrations using erythromycin-resistant S. pyogenes. MethodsThe cell membrane isolates (CMIs) were prepared from S. pyogenes strain Spy 1558, erm. The ultrastructural morphology was studied using transmission electron microscopy (TEM). Carvacrol-treated CMIs were analyzed for fluidity changes using fluorescence-anisotropy. Changes in membrane lipid composition were assessed using ultra-high-performance liquid chromatography-mass spectrometry (UHPLC-MS/MS). ResultsFluidity of the bacterial membrane increased time-dependently when exposed to carvacrol. The CMI isolated from cells treated with carvacrol showed a change in cardiolipins (CL), phosphatidylglycerol (PG), and phosphatidylethanolamine (PE) percentages compared to the untreated control. ConclusionCarvacrol induces modulation of specific membrane phospholipid and fatty acid composition of S. pyogenes. Further investigations are necessary to understand how fatty acid and phospholipid biosynthesis can be influenced by carvacrol.

Essential Oil of Fractionated Oregano as Motility Inhibitor of Bacteria Associated with Urinary Tract Infections.

In this research, several analyses were carried out on concentrated fractions of Mexican oregano essential oil (Poliomintha longiflora Gray) in order to determine its ability to inhibit the growth and the motility of Escherichia coli (swimming), Pseudomonas aeruginosa (swimming), and Proteus vulgaris (swarming); these Gram-negative bacteria associated with urinary tract infections are motile due to the presence of flagella, which is considered an important virulence factor that favors their motility when trying to reach the target organ and cause an infection. Also, the resistance pattern to antibiotics of each strain was determined. The results showed resistance pattern (8 out of 12 antibiotics tested) for P. aureginosa, while E. coli and P. vulgaris were resistant to 4 antibiotics out of the 12 tested. On the other hand, fractionated oregano caused an inhibition of growth and a reduction in motility, varying between fractions and among bacteria. Fraction 4 showed major growth reduction, with MBC values ranging from 0.002 to 23.7 mg/mL. Treatment with fractionated oregano (F1, F2, F3, F4) reduced the motility by 92-81% for P. vulgaris, 90-83% for E. coli, and 100-8.9% for P. aeruginosa. These results demonstrated a higher performance with a lower application dose due to its high content of Carvacrol and Thymol; unlike other concentrated fractions, this synergy of oxygenated monoterpenes may cause greater antimicrobial activity.

STUDY OF THE LONG-TERM EFFECTS OF DIABETES ON THE OVERALL HEALTH AND QUALITY OF LIFE IN THALASSEMIA PATIENTS

Thalassemia is a genetic blood disorder characterized by chronic anemia, requiring regular blood transfusions and chelation therapy. Diabetes mellitus is a common complication in thalassemia patients, primarily due to iron overload affecting the pancreas. This study investigates the long-term effects of diabetes on the overall health and quality of life in thalassemia patients. The research aims to understand how diabetes exacerbates complications associated with thalassemia and to identify strategies for improved management and care. The study includes a cohort of thalassemia patients with diabetes, compared to a control group of thalassemia patients without diabetes. Parameters assessed include glycemic control, incidence of diabetes-related complications, and overall health markers such as liver function, cardiovascular health, and renal function. Quality of life is measured using standardized questionnaires addressing physical, emotional, and social well-being. Preliminary findings indicate that thalassemia patients with diabetes have a significantly higher incidence of comorbid conditions, including cardiovascular disease and renal impairment (De Sanctis et al., 2016). Additionally, the quality of life in these patients is notably lower, with increased reports of fatigue, pain, and psychological distress (Haines et al., 2013). Effective management of diabetes in thalassemia patients, through regular monitoring and tailored treatment plans, is crucial in mitigating these adverse effects and improving patient outcomes (Farmaki et al., 2006). This study underscores the importance of integrated care approaches for thalassemia patients with diabetes, emphasizing the need for multidisciplinary teams to address the complex interplay of these conditions. Further research is needed to develop targeted interventions that can enhance the long-term health and quality of life for this vulnerable patient population. Results: study indicated that plant extracts exhibited higher inhibition than antibiotics. The minimum inhibitory concentration (MIC) while the results of the lowest inhibitory concentration of carvacrol for the bacterial species under study showed that it had an effect at a concentration of 615 µg/ml against Escherichia coli, 307.5 µg/ml for the species Corynebacterium stratium, Morganella morganii and Pseudomonas aeruginosa, and the least effect was 76.875 µg/ml on Staphylococcus aureus, it gave less results than the antibiotic used Carvacrol (Absorbance was measured at Wavelength 600) .

INVESTIGATION INTO THE IMPACT OF CARVCROL EXTRACTS ON BACTERIA ISOLATES FROM OSTEOMYLITIS AFTER SURGERY

Carvacrol is one of the most ancient medicinal herbs. Carvacrol contains different alkaloids, flavonoids and saponins. In present studies the antimicrobial activity of Carvacrol alcoholic extract against Gram-negative bacterial and Gram-positive bacterial were determined by the microtiter plate method. Gram-negative bacterial and Gram-positive bacterial strains isolated from osteomyelitis patients after surgery in Mosul city , A total of 60 samples were collected from various sources in Mosul hospitals, during the period from January 10, 2024 , to May 1, 2024. The Aim of this study is determining the effectiveness and effect of alcoholic extract of carvacrol on bacterial isolates taken from a Osteomyelitis after surgery. Bacterial culture results on blood agar, MacConkey agar and nutreint agar revealed 54 positive samples for bacterial growth. Among these, Staphylococcus aureus 22 isolates (32.8%), Pseudomonas aeruginosa 12 isolates (17.9%), Enterobacter cloacae 5 isolates (7.5%) Klebsiella pneumoniae 4 isolates (5.9%), Escherichia coli 4 isolates (5.9%), Proteus mirabilis 3 isolates (4.5%), Streptococcus viridans 3 isolates (4.5%), Corynebacterium spp 2 isolates (3%). As for the following bacterial isolates, each of them constituted one isolate out of a total of 67 isolates, at a rate of 1.5% for each: Providencia spp. , Acinetobacter spp., Staphylococcus saprophyticus , Klebsiella oxytoca , Enterococcus spp. , Enterococcus faecium , Citrobacter freundii , Streptococcus groups C , Bacillus cereus , Enterobacter spp. , Acinetobacter baumannii , Morganella morganii, using vitek-2. High-performance liquid chromatography (HPLC) analysis of Oregano plant revealed the presence of active compounds such as Carvacrol, thymol. Plant extracts from carvacrol demonstrated a substantial inhibitory effect. Results: study indicated that plant extracts exhibited higher inhibition than antibiotics. The minimum inhibitory concentration (MIC) while the results of the lowest inhibitory concentration of carvacrol for the bacterial species under study showed that it had an effect at a concentration of 615 µg/ml against Escherichia coli, 307.5 µg/ml for the species Corynebacterium stratium, Morganella morganii and Pseudomonas aeruginosa, and the least effect was 76.875 µg/ml on Staphylococcus aureus, it gave less results than the antibiotic used Carvacrol (Absorbance was measured at Wavelength 600) .

Morphological and phenological characteristic, oil yield, quality and economics of Lemon bee balm (Monarda citriodora Cerv. ex-Lag) at diverse environment condition, India

Lemon bee balm (Monarda citriodora Cerv. ex-Lag) is a noble industrial medicinal and aromatic plant species, which is used as digestive, antifungal, anti-inflammatory and menstrual irregularity remedies in traditional medicine. It is a common source of thymol and other active constituents with recognized antimicrobial properties. A multilocation field trial was performed to evaluate essential oil (EO) yield stability, secondary metabolites and economic returns in eight diverse geographical environment conditions (GEC) in India. The secondary metabolites viz., essential oil content and oil yield were found to be highest in tropical and sub-tropical regions. The essential oil content was found to be higher in inflorescence part at all the experimental sites and found to be highest (0.85±0.21%) at BR-JALAUN. The highest EO yield (130.25±3.25 kg ha−1), net return (Rs. 1,22,125.00±245.21 ha−1) and benefit cost (B:C) ratio (2.67±0.17) was recorded at FFDC-KANNAUJ. The thymol content percentage was found to be highest on physiological maturity (>95% flowering) [PM] and on 75% flowering [FS-II] and it began to decline on seed formation stage at all the experimental sites. The significantly highest thymol content percentage was found on PM (86.65±3.91%) and on FS-II (84.21±3.78%) at TBR-JHANSI. On the basis of the gas chromatography and mass spectrophotometry analysis, twenty constituents were isolated. The inflorescence EO contains more thymol than the EO from leaves with stem which in turn was characterized by a higher content of p-cymene, γ-terpinene, carvacrol, α-phellandrene, α-pinene, myrcene, α-terpinene, citral and β-caryophyllene.

Spacing and nitrogen application affect Indian oregano (Origanum vulgare L.) biomass, essential oil yield and composition

Oregano offers culinary and medicinal applications for mankind. Due to its vast health benefits, its consumption has been gradually rising in the modern era. Since, the nutrients and proper spacing are critical factors influencing plant growth, current study endeavors to investigate the effects of four different nitrogen levels (N0: 0 kg/ha, N1: 50 kg/ha, N2: 100 kg/ha, and N3: 150 kg/ha) combined with three row spacings (S1 = 45 × 45 cm, S2 = 45 × 30 cm, and S3 = 45 × 15 cm) on the growth and production of oregano, with the goal of optimizing nitrogen levels and spacing for effective cultivation of a recently released Indian oregano variety i.e., CIM-Sudeeksha. The study revealed that the N2S2 treatment (i.e., 100 kg/ha nitrogen and 45 × 30 cm spacing) produced the tallest plants, measuring 63.60±0.79 cm. On the other hand, the N2S3 treatment (i.e., 45×15 cm spacing and 100 kg/ha nitrogen) resulted with the remarkable yields of both fresh and dry herbs and oil, measuring 292.23±2.03 (Fresh herb) and 73.04±2.61 (dry herb) q/ha, 63.37±5.27 (Fresh herb oil), and 56.14±4.14 (Dry herb oil) kg/ha respectively, whereas N3S3 treatment showed highest but insignificantly different dry herb oil content i.e., 56.32±2.42 kg/ha. Also, the chemical composition of N2S2 treatment showed more carvacrol content (56.89 % in fresh and 52.62 % in dry herb) then N2S3 and N3S3 treatment. The results showed that the effects of nitrogen application with rates of 100 kg/ha and 150 kg/ha were similar on almost all agronomic traits and oil yield parameters. Furthermore, the 45×30 cm spacing showed encouraging outcomes, increasing vegetative growth and decreasing plant competition. Given these findings, it is advised to use 45×30 cm spacing and 100 kg/ha nitrogen fertilization for increased Indian oregano production and economical resource utilization.

Polyphenol Contents, Antibacterial and Antioxidant Effects of Four Palestinian Honey Samples, and their Anticancer Effects on Human Breast Cancer Cells

The phenolic compounds of four Palestinian honey samples (PH1-PH4) and their antibacterial effects as well as their cytotoxic, cytostatic, and antimigration effects in human breast cancer cell line (MDA) were evaluated here. HPLC analysis of PH2 (Cornflower), PH3 (Milk thistle), and PH4 (Ziziphus) revealed 15 phenolic compounds, namely, caffeic acid, carvacrol, chrysin, ellagic acid, galangin, gallic acid, kaempferol, p-coumaric acid, pinobanksin, pinocembrin, protocatechuic acid, quercetin, rutin, salicylic acid, and silydamin. The minimum inhibitory concentration (MIC) method applied to Pseudomonas aeruginosa (P. aeruginosa), Staphylococcus aureus (S. aureus), and Escherichia coli (E. coli). A strong positive correlation was detected between antimicrobial activity (E. coli) and p-coumaric acid, quercetin, and silydamin. IC50 values for DPPH neutralization varied from 0.19 w/w% to 10 w/w%. The potential anticancer properties of the honey samples were evaluated on MDA cells. Samples PH2 and PH3 demonstrated cytostatic activity, reducing cell viability by about 43% at non-toxic concentration of 4 mg/mL. The cytostatic effects were strongly correlated with the presence of caffeic acid, chrysin, protocatechuic acid, rutin, and salicylic acid (p &lt; 0.01). Moreover, the cell migration rate was significantly reduced (by up to 85%) with PH2 and PH3 compared to untreated cells (p &lt; 0.05). A strong positive correlation was observed between the cytostatic effects of the concentration of carvacrol and Pinocembrin (p &lt; 0.01). Our findings validate honey’s antibacterial properties and suggest its anticancer benefits may stem from cytostatic and antimigration effects.

Carvacrol and thymol effect in vapor phase on Escherichia coli and Salmonella serovar Typhimurium growth inoculated in a fresh salad

This study aimed to evaluate the antimicrobial effect of thymol and carvacrol in inhibiting Escherichia coli and Salmonella serovar Typhimurium inoculated on a fresh green salad through the vapor phase. A film-forming solution was prepared by dissolving starch, sorbitol, and variying concentrations of carvacrol, thymol, and a mixture of both. The film-forming solution containing the respective antimicrobial agent was then added lid, which was sealed rigidly and hermetically to achieve different concentrations (105 mg/L of air of carvacrol, 105 mg/L of air of thymol, and a mixture of 52 mg/L of air of carvacrol and 52 mg/L of air of thymol). Each active package contained fresh green salad inoculated with E. coli or Salmonella serovar Typhimurium. The active packages were then sealed and refrigerated at a temperature of 6 °C for 48 h. Growth/inhibition curves were modelled using the Weibull equation, and consumer acceptance was evaluated. Carvacrol can reduce up to 0.5 log-cycles, while thymol can reach almost 1 log cycle. Blending the components with half the concentration has a synergistic effect, inhibiting up to 2.5 log cycles. Consumer ratings revealed no significant differences between the packages. However, the average score was 5.4 on a 9-point hedonic scale, evaluators' comments did not indicate dislike or a strong taste characteristic of thymol and carvacrol.

The inhibitory effects of carvacrol, nystatin, and their combination on oral candidiasis isolates

BackgroundCandida, a common oral microbiota, can cause opportunistic fungal infections. With rising Candida infections and limited effective antifungals, new treatments are needed. This study investigates carvacrol essential oil’s effect on oral candidiasis, alone and with nystatin, compared to nystatin alone.Materials and methodsIn this study, oral samples were collected from dental clinic patients, especially denture users. The presence of Candida was confirmed and cultured from these samples. Candidiasis was detected by observing Candida colonies. Drug sensitivity was tested on 100 positive samples. The minimum concentration of inhibition and lethality of each isolate was evaluated using nystatin and carvacrol. The results were compared using two-way analysis of variance. Finally, the minimum inhibitory concentration (MIC) of nystatin and carvacrol was calculated individually and in combination.ResultsThe present study found that Candida albicans and non-albicans species were equally prevalent. Carvacrol showed significant biological activity against all Candida species, with an average MTT of 50.01%. The average MIC value of carvacrol was 24.96 µg/ml, indicating its potential to inhibit Candida growth. The mean Minimum Fungicidal Concentration (MFC) value of carvacrol was 23.48 µg/ml, suggesting its effectiveness in killing the fungi.ConclusionThe study’s findings reveal that the MIC of carvacrol was significantly lower than that of nystatin and the combination of nystatin and carvacrol. This suggests that carvacrol holds potential as an effective herbal remedy for candidiasis.

Extracting and evaluating the antibacterial activity of carvacrol from Plectranthus Amboinicus essential oil against Staphylococcus aureus and MRSA

The essential oil of Plectranthus amboinicus was extracted through steam distillation. Carvacrol, the major constituent of the oil, was identified and found to make up 60.003% of the oil. Carvacrol was isolated using column chromatography with silica gel (200-430 mesh) and hexane: ethyl acetate (100:1) eluent solvent mixture, resulting in a high purity of 98.32%. Antimicrobial activity testing revealed that both Staphylococcus aureus and MRSA strains were sensitive to carvacrol and Plectranthus amboinicus essential oil (20 mg/mL). The antibacterial zone diameters were measured to be 20.20 ± 0.36 mm and 17.33 ± 0.32 mm for S. aureus, and 24.23 ± 0.47 mm and 21.53 ± 0.55 mm for MRSA, respectively. The minimum inhibitory concentration (MIC) of carvacrol against S. aureus and MRSA was determined to be 0.5 mg/mL. The minimum bactericidal concentration (MBC) against S. aureus was 1 mg/mL, while it was 0.5 mg/mL against MRSA.

Effect of gamma rays on the essential oil and biochemical characteristics of the Satureja mutica Fisch & C. A. Mey.

There are 16 species in the genusSaturejaL. (Lamiaceae), of which10are native.This research aimed to investigate the effect of gamma rays and storage conditions and duration on the percentage and components of the essential oil and some biochemical characteristics ofSatureja muticaFisch & C.A. Mey at the Research Institute of Forests and Rangelands.Plants were collectedat the full floweringstageand exposed todifferent doses of gamma rays (0, 2.5, 5, 7.5, and10kGy)at the Atomic EnergyOrganization, Iran.The samples were keptin a refrigerator (4°C)and in the shade(25 ± 2°C) for 0, 120, and 240h. This experiment was performedin acompletely randomizeddesign. Essential oil extraction was done by water distillationfor2h. The composition of their essential oil components was identified usingGC and GC/MS.Somebiochemicaltraits, including phenol content, antioxidant capacity, and carbohydrate content, were measured. The results indicated that irradiation on the percentage of essential oil showeda statistically significant difference. In addition, theinteraction effect of irradiation × storage conditions, irradiation × duration of storage, on the percentage of essential oilwassignificant. According to a comparison of the means, 2.5kGy irradiation produced the highest percentage of essential oil (0.4%); in contrast, a significant decreasewas detectedin components with 7.5 and 10kGy irradiation. It was observed thatthepercentage of some essential oil compounds decreasedwith the gamma-ray intensity increase.2.5kGy of gamma rays and shade storage conditions for 240h led to the highest content of p-cymene and carvacrol. Nevertheless,the highest thymol content wasobtained under refrigeration conditions without irradiation. The maximum phenol content and antioxidant capacity were obtained when the plants were irradiated with 2.5 and7.5kGy gamma rays.However,the maximum carbohydrate ratewas observed in non-irradiated plants.It was concluded that low-intensity gamma rays could improve the percentage of essential oil and main components like p-cymene and carvacrol in S. mutica Fisch & C.A. Mey.

Study of antimicrobial properties of liquid plaster containing of oregano essential oil (Origanum vulgare L.)

Treatment of wounds resulting from combat injuries is complicated by the addition of a secondary infection caused by multi-resistant bacteria. The liquid patch appears to be a promising formulation for wound therapy. The antimicrobial effect of essential oils is manifested due to the content of numerous components that interfere with the proliferation and formation of bacterial resistance. The aim of the work was to substantiate the choice of Origanum vulgare L. essential oil as the main active ingredient of a liquid patch with antimicrobial action, confirm the composition of the essential oil and study the antimicrobial properties of the model drug. The object of the study were model samples of a liquid patch with an experimentally developed film-forming system. Various concentrations of commercial essential oil of O. vulgare L., the composition of which was confirmed by GB/MS analysis, were used as the active pharmaceutical ingredient. Antimicrobial activity was studied by direct contact method using microbial culture tests. The use of liquid patch in the treatment of skin lesions of various etiologies, including combat wounds, is justified. The variability of the composition of the essential oil of O. vulgare L. depending on the subspecies, chemotype and growth conditions of the plant is discussed. The component composition of a commercial sample of O. vulgare L. essential oil, confirmed by GC/MS analysis, is considered. 11 components declared by the manufacturer were found to be completely identical, in particular, carvacrol, thymol, and monoterpene hydrocarbons. The other 11 compounds discovered were monoterpenoids and sesquiterpenoids. Research has confirmed the feasibility of using O. vulgare L. essential oil, thymol-carvacrol chemotype, as an antimicrobial component. The dependence of the antimicrobial activity of model samples of liquid plaster on the concentration of Oregano essential oil was established. The essential oil of O. vulgare L. has a variable composition and requires mandatory control of the content of thymol and carvacrol, which inhibit the growth of the studied microorganisms. The antimicrobial effect of a liquid patch containing essential oil of O. vulgare L. at a concentration of 0.15 mg/ml is manifested against test cultures of microorganisms – Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus, Enterococcus faecalis.

RNA-seq analysis reveals narrow differential gene expression in MEP and MVA pathways responsible for phytochemical divergence in extreme genotypes of Thymus daenensis Celak

BackgroundHere, we investigated the underlying transcriptional-level evidence behind phytochemical differences between two metabolically extreme genotypes of Thymus daenensis. The genotypes ‘Zagheh-11’ (thymol/carvacrol type, poor in essential oil [EO] [2.9%] but rich in triterpenic acids) and ‘Malayer-21’ (thymol type and rich in EO [3.8%]) were selected from an ongoing breeding program and then clonally propagated for further experimental use.Materials and methodsGC-MS, GC-FID, and HPLC-PDA were utilized to monitor the fluctuation of secondary metabolites at four phenological stages (vegetative, bud burst, early, and full-flowering stages). The highest phytochemical divergence was observed at early flowering stage. Both genotypes were subjected to mRNA sequencing (approximately 100 million paired reads) at the aforementioned stage. The expression patterns of four key genes involved in the biosynthesis of terpenoids were also validated using qRT-PCR.ResultsCarvacrol content in ‘Zagheh-11’ (26.13%) was approximately 23 times higher than ‘Malayer-21’ (1.12%). Reciprocally, about 10% higher thymol was found in ‘Malayer-21’ (62.15%). Moreover, the concentrations of three major triterpenic acids in ‘Zagheh-11’ were approximately as twice as those found in ‘Malayer-21’. Transcriptome analysis revealed a total of 1840 unigenes that were differentially expressed, including terpene synthases, cytochrome P450, and terpenoid backbone genes. Several differentially expressed transcription factors (such as MYB, bZIP, HB-HD-ZIP, and WRKY families) were also identified. These results suggest that an active cytosolic mevalonate (MVA) pathway may be linked to higher levels of sesquiterpenes, triterpenic acids, and carvacrol in ‘Zagheh-11’. The chloroplastic pathway of methyl erythritol phosphate (MEP) may have also contributed to a higher accumulation of thymol in Malayer-21. Indeed, ‘Zagheh-11’ showed higher expression of certain genes (HMGR, CYP71D180, β-amyrin 28-monooxygenase, and sesquiterpene synthases) in the MVA pathway, while some genes in the MEP pathway (including DXR, ispG, and γ-terpinene synthase) were distinctly expressed in Malayer-21. Future efforts in metabolic engineering of MVA/MEP pathways may benefit from these findings to produce increased levels of desired secondary metabolites at commercial scale.

Protective Effect of Salvia cadmica on Fibroblast Cells from t-bhp-induced Oxidative Damage

Background:: Salvia species known as "Sage" are among the important aromatic plants used in the world. This study, it was investigated the antioxidant capacity of Salvia cadmica and to investigate its protective effect on oxidative damage in t-BHP-induced fibroblast cells. Methods:: Antioxidant activity and phenolic characterization of the extract were evaluated using DPPH, TPC, TFC, FRAP, and HPLC, respectively.TAS, TOS, MDA and 8-oxo-guanine, CAT, SOD, and GPx values were examined using enzyme-linked immunosorbent assay (ELISA). The antiproliferative and apoptosis effects of Salvia cadmica ethanolic extract were determined using XTT assay and fluorescent probes in fibroblast cells. Results:: As a result of GC-MS analysis of Salvia cadmica ethanolic extract, carvacrol content was found to be high. The IC50 value of the DPPH antioxidant assay of the Salvia cadmica ethanolic extract was 80 ± 0.51 μg/mL. TPC, TFC, and FRAP values were found to be 18.25 ± 0.64 (mg gallic acid/g powder), 1.691±0.314 (mg quercetin /g powder), 31.5 ± 0.10 (mg Trolox/g powder), respectively. Total antioxidant and TOS values were found to be 0.383±0.033 (mmol Trolox Equ L-1), 16.31±0.71 (μmol H2O2 L-1) for 0.25 mg/mL, and 0.725±0.05 (mmol Trolox Equ L-1), 12.02 ±0.56 (μmol H2O2 L-1) for 0.5 mg/mL. In addition, while CAT and GPx significantly decreased enzyme activities, no significant change was observed in SOD enzyme activity. Ethanolic Salvia cadmica extract exhibited apoptotic features compared to only the t-BHP group. Conclusion:: These results suggest that Salvica cadmica extract works through a free radical mechanism.