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Antioxidant, antimicrobial and antiproliferative activities of Anthemis palestina essential oil
© Bardaweel et al.; licensee BioMed Central Ltd. 2014
Received: 15 January 2014
Accepted: 4 August 2014
Published: 12 August 2014
Anthemis palestina (Asteraceae) extends across the Mediterranean region, southwest Asia and eastern Africa. Although traditionally used for several applications, in vitro investigation of biological functions associated with Anthemis palestina essential oil had never been reported.
The air-dried flowers of Anthemis palestina were subjected to hydrodistillation to yield the oil. The antioxidant activity of the hydrodistilled oil was characterized using various in vitro model systems such as DPPH, ferric-reducing antioxidant power and hydroxyl radical scavenging activity. Antibacterial activity was tested against six bacterial species, representing both Gram positive and Gram negative bacteria. Antifungal activity was evaluated using three Candida species. The minimum inhibitory concentration (MIC) for each examined microorganism was determined using the microdilution method. The oil’s antiproliferative effects against eight human cancer cell lines were also studied and the lethal doses that resulted in 50% reduction of cell viability (LD50) were determined.
The results indicate that the essential oil of Anthemis palestina exhibited substantial antioxidant activities as demonstrated with DPPH, ferric reducing antioxidant power, and hydroxyl radical scavenging activity. In addition, a broad-spectrum antibacterial activity of the oil was revealed with better susceptibility of Gram positive bacteria towards the oil. The MIC values ranged between 6–75 μg/ml. Besides, the oil demonstrated a moderate inhibitory effect on the three Candida species examined; with MIC values ranging between 48–95 μg/ml. Potent cytotoxic activities, especially against HeLa cell line; with LD50 of 32 μg/ml, BJAB cell line; with LD50 of 57 μg/ml, and Caco-2 cell line; with LD50 of 61 μg/ml, were observed.
The results obtained indicate high potential of Anthemis palestina essential oil as bioactive oil, for nutraceutical and medical applications, possessing antioxidant, antimicrobial and antiproliferative activities.
The genus Anthemis is one of the most important genera of the Asteraceae family and comprises of approximately 210 species . The geographic distribution of Anthemis extends across Europe, Southwestern Asia, Northern and Northeastern Africa, Southern Arabia, and tropical East Africa [2, 3]. Since the Roman times, the species of this genus have been commonly used in traditional medicine therapies [4, 5]. In the Mediterranean region, anti-inflammatory, antioxidant, antibacterial, and antispasmodic remedies are the most common traditional applications of the genus species.
During the last two decades, chemical composition of various extracts of Anthemis species was thoroughly investigated. Basically, flavonoids, polyphenolics and terpenes were reported as the main constituents of the plant [6, 7]. Recently, numerous Anthemis species have shown potential antimicrobial activity that could be correlated to their pehnolics and flavanoids composition [7, 8]. Additionally, digestive, antispasmodic and anti-Helicobacter pylori activities were all linked to Anthemis species in several reports [9–11]. On the other hand, the essential oils from different Anthemis species are frequently encountered as preservatives and flavoring agents in pharmaceuticals and cosmetic products [12–16].
Anthemis palestina Reut. ex Boiss., is distributed in the Middle and the Northern mountainous regions of Jordan, where it is known as Palestine chamomile due to resemblance to Roman and German chamomiles; the plant is an annual herb with flowering period between March-June . Despite the extensive use of A. palestina in Folk medicine in Jordan, there have been only limited attempts to investigate the chemical or the biological properties of this plant in relation to its medicinal uses. Nonetheless, chemical composition of the essential oil isolated from flowers of A. palestina was recently reported by Tawaha et al.. In the present study, in an effort to characterize the biological activities of A. palestina, we report here the antioxidant, antimicrobial, and antiproliferative activities associated with the essential oil isolated from the air-dried flowers of the plant. To our knowledge, thoroughly detailed studies on different aspects of the biological activity of A. palestina have not been reported yet.
The dried flowers of Anthemis palestina Reut. ex Boiss. were collected from Houfa region, Irbid (Northern Jordan), during its flowering phase (March to May), in Mid-April, 2012. The taxonomic identity of the collected plant was confirmed by Eng. Mohammad Al-Gharaibeh, a botanist, Department of Natural Resources and Environment, Faculty of Agriculture, Jordan University of Science and Technology (JUST), Irbid, Jordan. A voucher specimen (No. KT-AP-JOR-2012) has been deposited at the herbarium of the same institute.
Essential oil isolation
The air-dried flowering parts (whole flowers) of the collected plant were ground to about 0.5 mm particle size (30–35 mesh). To obtain the essential oil, 500 g of the ground plant material were accurately weighed and subjected to hydrodistillation using Clevenger-type apparatus for 4 hours. The hydrodistilled oil (yield ~ 0.7%) was dried over anhydrous sodium sulphate and reserved at 4°C in a sealed brown vial until required.
Essential oil composition analysis
Oil composition analysis was achieved via GC-FID and GC-MS analysis as reported in details in our previous In-Press work by Tawaha et al. . Briefly, samples of the oil were injected to both system and analyzed under linear temperature programming. Compounds identification was performed by matching their spectra with the data bank mass spectra (WILEY, NIST and ADAMS-2007 libraries) and also by comparing their calculated arithmetic indices with reported values in the literature including the Adam’s library . Identification of the main components was further confirmed by co-chromatography of their authentic standards under the same chromatographic conditions of samples analysis .
DPPH free radical scavenging activity
The free-radical scavenging activity of the hydrodistilled oil was measured as a decrease in the absorbance of methanol solution of 2,2-diphenyl-1-picrylhydrazil (DPPH). A stock solution of DPPH (0.1 mM) was prepared in methanol and different concentrations of the essential oil were added (5–250 μg/ml). After incubation at room temperature for 30 min, the pale pink color developed was measured spectrophotometerically at 517 nm and compared with the standard (5–250 μg/ml ascorbic acid) . Free radical scavenging activity was expressed as the percentage inhibition calculated using the following formula: % Anti-radical activity = (Control Absorbance- Sample Absorbance) × 100/Control Absorbance.
Hydroxyl radical scavenging activity
The oil (0.2 ml) at different concentrations (5–250 μg/ml), was added to 1 ml of iron-EDTA solution (0.13% ferrous ammonium sulphate and 0.26% EDTA), 0.5 ml of 0.018% EDTA, 1 ml of DMSO (0.85% v/v in 0.1 M phosphate buffer, pH 7.4) and 0.5 ml of 0.22% ascorbic acid were added to each tube. The tubes were capped tightly and heated in a water bath at 80-90°C for 15 min. The reaction was terminated by adding 1 ml of ice-cold trichloroacetic acid (TCA) (17.5% w/v). Afterward, 3 ml of Nash reagent (75.0 g of ammonium acetate, 3 ml of glacial acetic acid and 2 ml of acetyl acetone were mixed and distilled water was added to make up total volume of 1 L) was added to each tube, then left at room temperature for 15 min for color development. The intensity of the yellow color formed was measured at 412 nm against blank . Percentage inhibition was determined by comparing the results of the test and the standard compound (ascorbic acid) by using the formula: % inhibition activity = (Control Absorbance- Sample Absorbance) × 100/Control Absorbance.
Ferric-reducing antioxidant power (FRAP) assay
A0 = Absorbance of the control (potassium phosphate buffer + FRAP reagent)
A1 = Absorbance of sample
Six bacterial and three fungal species were obtained from the Microbial Culture Collection Center of Medicine School at The University of Jordan, Jordan. The species are: Bacillus subtilis ATCC 11562, Staphylococcus aureus ATCC 6538, Staphylococcus epidermidis ATCC 12228, Escherichia coli ATCC 29425, Pseudomonas aeuriginosa ATCC 11921, Xanthomonas vesicatoria ATCC 11633, Candida albicans ATCC 10231, Candida glabrata ATCC 1615, and Candida krusei ATCC 6258.
Determination of minimum inhibitory concentration (MIC)
The MICs of the oil against the microorganisms under investigation were assessed according to the broth microdilution method, as previously reported , with minor modifications. Briefly, 0.3 ml of the oil was dissolved in DMSO and serial diluted with the medium to the desired concentrations. MIC tests were carried out in 96 flat bottom microtiter plates (TPP, Switzerland). Each test well was filled with 100 μl nutrient broth. A sample (100 μl) of the stock solution was added to the first test well and mixed. A series of dilutions was then prepared across the plate. A 10 μl aliquot of the microorganism was used to inoculate each microtiter plate well to achieve a final inoculum size of 1 × 105 CFU/ml. Bacteria were grown in Mueller-Hinton broth (MHB; Oxoid, Basingstoke, UK) whereas Candida were grown in Yeast Peptone Dextrose (YPD) broth (BD Difco™). Positive controls, Norfloxacin for bacteria and Amphotericin B for fungi, and a negative control of the vehicle (DMSO), were prepared under the same experimental conditions and employed in triplicates.
Bacterial plates were incubated for 24 h at 37°C, whereas Candida plates were incubated for 48 h at 33°C, with shaking. After completion of the incubation period, optical densities were measured at 600 nm (OD600) using a Microplate Reader (Palo Alto, CA, USA). The minimum inhibitory concentration (MIC) value was defined as the lowest concentration that inhibited visible microbial growth of the tested microorganism. MIC determination was carried out in triplicates (in same 96-well plate) and repeated three times for each microorganism.
Cell lines were cultured in high glucose Dulbecco’s Modified Eagle Medium (DMEM) (Invitrogen, USA) containing 10% heat inactivated fetal bovine serum (HI-FBS) (Invitrogen), 2 mmol/l L-glutamine, 50 U/ml penicillin and 50 μg/ml streptomycin. Cell lines were maintained at 37°C in a 5% CO2 atmosphere with 95% humidity. The cells were passaged weekly, and the culture medium was changed twice a week. The optimal plating densities were determined according to the cells growth profiles,
Cytotoxicity was determined using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide (MTT, Sigma) assay, as previously described . The concentration that inhibits the proliferation of oil-treated cells by 50% relative to the control (untreated cells) was used to evaluate the cytotoxic activity of the essential oil. To ensure exponential growth throughout the experimental period, as well as a linear relationship between absorbance at 570 nm and cell number when analyzed by the MTT assay, 2 × 104 cells per well were seeded of each cell line. Treated cells were incubated in a 37°C incubator with 5% CO2 for 48 h. As a positive control, vincristine sulphate (Sigma) was used at concentrations of 50 and 100 nM. In addition, a negative control; control wells without essential oils treatment, was employed and prepared under the same experimental conditions. All treatments were carried out in triplicates (in same 96-well plate) and repeated two times for each cell line.
All results were expressed as the mean ± standard deviation (SD). Data were analyzed with Statistical Package for Social Sciences program (SPSS) database for Windows, version 17 (SAS Institute, Cary, NC). The t-test was used to test for statistical significance with a p-value <0.05 deemed as significant.
Results and discussion
The simultaneous use of mass spectral and retention (Kovat’s) index matching allowed for the unequivocal identification of more than 97% of the components of the oil, obtained from flowers, as previously determined by the GC and GC-MS analyses . The oil yield was 0.7% (v/w dried material). The analyses permitted the identification of about 109 compounds in the oil of A. palestina. The oil was characterized by dominant levels of sesquiterpenes (71.4%, hydrocarbons = 26.6% and oxygenated = 44.8%) and a moderate level of monoterpenes (19.4%), mainly oxygenated (18.5%). Spathulenol (9.8%) was the principal oil component, where, germacrene D (8.9%), caryophyllene oxide (6.8%), 3-thujanol acetate (3.7%), E-β-farnesene (3.5%), bornyl andelate (3.2%), 1,8-cineole (2.9%), salvial-4(14)en-1-one (2.5%), α-cadinol (2.4%), β-caryophyllene (2.3%) and some other components were the major oil constituents.
Free radicals are the most common initiators of oxidative reactions that may result in numerous deleterious effects . Natural antioxidants can scavenge and react with free radicals, and hence terminate the free radical reaction. Recently, herbal medicines containing free radical scavengers are drawing attention of the pharmaceutical research for their importance in preventing and treating several diseases and disorders . Generally, essential oils were shown to protect against oxidative stress by contributing to the total antioxidant defense system of the human body . Recently, a number of essential oils isolated from several medicinal and aromatic plants were shown to possess considerable antioxidant potential and, consequently, protect against some cardiovascular and degenerative diseases [26–28]. Our findings demonstrate that the essential oil of A. palestina has a substantial antioxidant potential that may be attributed to its chemical composition.
The MIC values (μg/ml) of Anthemis palestina essential oil
Gram positive bacteria
25 ± 6
10 ± 2
6 ± 1
Gram negative bacteria
53 ± 4
75 ± 8
73 ± 6
48 ± 5
86 ± 4
95 ± 3
Notably, the essential oil of A. palestina exhibited moderate antifungal activity against Candida albicans; with MIC value of 48 ± 5 μg/ml, Candida glabrata; with MIC value of 86 ± 4 μg/ml, and Candida krusei; with MIC value of 95 ± 3 μg/ml (Table 1). The increased incidence of systemic candidiasis infections, caused by pathogenic yeasts in critically ill patients , as well as the emergence of resistant Candida species to several antifungal drugs, necessitates a comprehensive search for newer drugs to treat candidiasis. Chemical diversity of medicinal plants may provide unlimited prospects for new therapeutic reagents discovery and development. Our findings indicate that the essential oil of A. palestina may have a potential for the development of new antifungal, as well as antibacterial agents, and demonstrate the importance of such medicinal plant in pharmaceutical production and industry.
The LD 50 values (μg/ml) of Anthemis palestina essential oil on eight human cancer cell lines
EBV-negative Burkitt’s lymphoma
57 ± 2
Human ductal breast epithelial tumor
71 ± 2
Human breast adenocarcinoma
79 ± 4
Human clear cell renal cell carcinoma
78 ± 3
Human kidney carcinoma
76 ± 2
Human colon adenocarcinoma
61 ± 3
Human epithelial carcinoma
32 ± 2
Human prostate adenocarcinoma
80 ± 6
Furthermore, literature reports on the composition-activity correlations were found in support with the findings of the present study. For example, in literature reviews concerning essential oils as active antimicrobials [33–35], it was reported that most of the antimicrobial activity of the essential oils is attributed to the oxygenated monoterpenes . In particular, it was evident that monocyclic monoterpenes, such as 1,8-cineole and terpinen-4-ol, exhibit high antimicrobial activity against a wide range of Gram-positive and Gram-negative bacteria [33–35]. Additionally, sesquiterpenes caryophyllene, germacrene D, caryophyllene oxide, and spathulenol were also reported among the most potent antimicrobial agents frequently occurring in essential oils [33–35]. Nonetheless, since essential oils consist of multiple components, their antimicrobial activities cannot be assigned to one particular component. In most cases their activity is a result of additive, synergistic or antagonistic effects of the individual constituents. Therefore, the principle oil component is generally assumed to possess the strongest activity that can be influenced by the presence of other oil components.
Similarly, cytotoxic activities of essential oils from various aromatic plants were attributed to specific components of the oils [36, 37]. Some of the main components of A. palestina oil have previously been tested for cytotoxic properties. For example, β-caryophyllene was reported to be specifically cytotoxic to MCF-7, MDA-MB-468 and UACC-257 cancer cell lines .
On the other hand, antioxidant activity is one of the most intensively studied subjects in essential oil research [39, 40]. The oxygenated constituents, specifically phenolic monoterpenic alcohols (e.g. thymol and carvacrol), as well as phenylpropanoids (e.g. eugenol), are the most powerful antioxidant volatiles . Nevertheless, some non-phenolic terpenoids were also reported to be of significant antioxidant capacities . Additionally, Many other components of essential oils were proposed to contribute to the antioxidant activity of essential oils ; including α-terpinene, β-terpinene, β-terpinolene, 1,8-cineole, menthone, isomenthone, and citronellal . Accordingly, the high percentage of oxygenated terpenoids and the particular presence of some alcohols, as 1,8-cineole and terpinen-4-ol, in the oil of A. palestina would rationalize its relatively high antioxidant activity.
In conclusion, our results revealed that the essential oil of Anthemis palestina exhibits considerable antioxidant activity and can be used as alternative medicine to prevent or treat oxidative stress. Furthermore, the examined oil demonstrates moderate antibacterial and antifungal activities elucidated by the growth inhibitory response against clinically problematic microorganisms. The discrepancy observed in the cytotoxicity activities of the oil against different cancer cell lines suggests a unique antiproliferative mechanism through which the oil exhibits its anticancer effects. Further research into the molecular mechanisms, as well as isolation and characterization of the chemical constituents responsible for the activity would be necessary to identify the active components with potential for clinical use.
The authors would like to thank The Deanship of Academic Research at The University of Jordan for financial support.
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