Chemical Composition and Antibacterial Activity of the <i>Lippia origanoides</i> Kunth Essential Oil from the Carajás National Forest, Brazil

Ribeiro, Fabiana Paiva; Santana de Oliveira, Mozaniel; de Oliveira Feitosa, André; Santana Barbosa Marinho, Patricia; Moacir do Rosario Marinho, Andrey; de Aguiar Andrade, Eloisa Helena; Favacho Ribeiro, Alcy

doi:https://doi.org/10.1155/2021/9930336

Evidence-Based Complementary and Alternative Medicine

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Abstract Introduction Materials and Methods Results and Discussion Conclusion Data Availability Conflicts of Interest Acknowledgments Supplementary Materials References Copyright Related Articles

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Antimicrobial Properties of Essential Oils

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Research Article | Open Access

Volume 2021 | Article ID 9930336 | https://doi.org/10.1155/2021/9930336

Chemical Composition and Antibacterial Activity of the Lippia origanoides Kunth Essential Oil from the Carajás National Forest, Brazil

Fabiana Paiva Ribeiro,¹Mozaniel Santana de Oliveira,²André de Oliveira Feitosa,³Patricia Santana Barbosa Marinho,³Andrey Moacir do Rosario Marinho,³Eloisa Helena de Aguiar Andrade,^2,3and Alcy Favacho Ribeiro¹

Academic Editor: Bashar Saad

Received28 Jun 2021

Revised23 Sept 2021

Accepted07 Oct 2021

Published19 Oct 2021

Abstract

Species of the genus Lippia are rich in essential oils and have shown antibacterial properties, which may be related to oils’ chemical composition. The present work aimed to evaluate the antimicrobial potential of Lippia origanoides Kunth against two bacteria strains: Escherichia coli and Staphylococcus aureus. Leaf essential oils were obtained by hydrodistillation in a modified Clevenger-type apparatus, and their chemical composition was determined by gas chromatography coupled to mass spectrometry (GC/MS) and flame ionization detection (GC/FID). We identified 28 compounds, representing 98.87% of the total concentration of the essential oil. The compounds identified at the highest concentrations were 1,8-cineole (35.04%), carvacrol (11.32%), p-cymene (8.53%), α-pinene (7.17%), and γ-terpinene (7.16%). The leaf essential oil of L. origanoides showed antibacterial action on biological isolates of Escherichia coli and Staphylococcus aureus. For Escherichia coli, the oil presented bactericidal action at concentrations of 5–20 μL/mL. Regarding Staphylococcus aureus, the bactericidal effect was noted at 20 μL/mL and the bacteriostatic action was noted around 2.5–10 μL/mL. Given the results obtained, L. origanoides essential oil showed promising biological potential against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria, thus encouraging further studies on substances isolated from this species to contribute to the development of new antimicrobial drugs.

1. Introduction

The Verbenaceae family comprises approximately 34 genera and 1,200 species. The most representative genera are Verbena, Lippia, Citharexylum, Stachytarpheta, Glandularia, and Duranta [1, 2]. This family is widely distributed throughout the tropical and temperate zones of the Americas, Africa, and India. South America, Mexico, and the Andes specifically concentrate most of the diversity of species [3, 4].

Belonging to the Verbenaceae family, Lippia origanoides is native to some countries of Central America and northern South America, especially the Amazon region. It grows to approximately three meters in height and is rich in essential oils with potential medicinal properties [5–8]. Traditionally, medicinal and aromatic plants of the Lippia genus have shown several properties, such as analgesic, anti-inflammatory, antipyretic, sedative, antifungal, antihypertensive, larvicide, repellent, and antimicrobial activities. These plants have been used in the treatment of skin, gastrointestinal, and liver diseases [9–12].

The occasional development of microorganism resistance to commercially available drugs has encouraged studies on the antimicrobial potential of essential oils, which search for compounds that can prevent and treat diseases [13, 14]. Regarding bacteria, the effect of essential oils depends on some factors, such as the technique applied and the period of plant collection, which can influence the concentration of the compounds that will act on bacteria [15, 16].

The Escherichia coli bacterium belongs to the family of Enterobacteriaceae. It is a Gram‐negative rod-shaped bacterium, nonsporulating, nonmotile, or motile by peritrichous flagella. Its ideal growth temperature is 37°C. E. coli is transmitted through contaminated food, as a result of inadequate handling and hygiene practices [17]. It causes a variety of diseases, such as diarrhea, which is a major cause of infant mortality [18]. Recently, this bacterium has been developing resistance through genetic mutations, hence hindering its control [19, 20].

Staphylococcus aureus is part of the human microbiota [21] but can cause local diseases, such as skin infection, metastatic abscess formation, sepsis, peritonitis, and pneumonia [22]. Due to its adaptability and resistance, S. aureus has become one of the most important species in hospital and community-acquired infections [23, 24]. In this context, considering the Amazon biodiversity and the need to promote its sustainable use, the present work aimed to evaluate the chemical composition and in vitro antimicrobial potential of L. origanoides Kunth essential oil against E. coli and S. aureus.

2. Materials and Methods

2.1. Raw Material Collection

The collection of the botanical material L. origanoides Kunth was carried out during the flowering period at the Carajás National Forest, an environmental protection area (geographic coordinates: 05°52′, 06°33′S; 49°53, 50°45′W). Samples were provided by Chico Mendes Institute for Biodiversity Conservation (ICMBio) (collection authorization number 24852-1). Specimens of L. origanoides Kunth were collected using botanical techniques and deposited in the João Murça Pires Herbarium of the Museu Paraense Emílio Goeldi, in Belém (Pará, Brazil), under the registration number MG 201029.

2.2. Essential Oil Isolation

To isolate the L. origanoides essential oil, we used 20 g of samples in a modified Clevenger-type apparatus coupled to a refrigeration system that maintained condensed water at 12°C. The essential oil obtained was centrifuged, and the residual moisture was removed with anhydrous sodium sulfate. Samples were stored in amber glass ampoules in the absence of oxygen and kept in a refrigerated room at −5°C. The oil yield was calculated by relating the volume of oil obtained and the material mass used in the extraction process on a dry basis [25, 26].

2.3. Chemical Composition Analysis

Chemical compositions were evaluated using a gas chromatograph (GC) coupled to a DSQ-II single quadrupole mass spectrometer (MS) (Thermo Fisher Scientific, Waltham, Massachusetts, USA) equipped with a silica capillary column DB-5MS (30 m × 0.25 mm × 0.25 µm) (Agilent Technologies, Santa Clara, CA, United States). The evaluation conditions were the following: the temperature increased from 60 to 240°C at 3°C/min; the injector temperature was 240°C; helium was the carrier gas (linear velocity of 32 cm/s, measured at 100°C); a 2 : 1000 aqueous solution of n-hexane was injected (0.1 µL); and the temperature of the ion source and other parts was 200°C. The quadrupole filter was scanned in the range of 39–500 Da per second. Ionization was achieved using the electronic impact technique at 70 eV. The retention index of all volatile compounds was calculated using a homologous series of n-alkanes (C₈–C₄₀) (Sigma-Aldrich, San Luis, AZ, USA) according to Van Den Dool and Dec Kratz [27]. The components were identified by comparison of (i) the experimental mass spectra with those existing in reference libraries and (ii) their retention indices with those found in the literature [28, 29]. Volatile components were quantified by peak area normalization using FOCUS GC/FID, which was operated under the same conditions as GC/MS, except for the carrier gas, which was nitrogen, as previously reported by our research group [30].

2.4. Analysis of In Vitro Antimicrobial Activity

The antimicrobial activity of L. origanoides oil was evaluated by the microdilution method, as described by Pinheiro et al. [31, 32]. Tests were performed at the Bioassay and Microorganism Chemistry Laboratory (LaBQuiM) of the Federal University of Pará, using strains provided by the Evandro Chagas Institute (IEC). Two bacteria were used: Escherichia coli (ATCC 25922) and Staphylococcus aureus (ATCC 25923). For 1 liter of broth, 37 g of brain heart infusion (BHI) agar was used. Then, 5 g of bacteriological agar was added to 100 mL of BHI broth. After these dilutions, all media were autoclaved at 121°C for 15 minutes to ensure complete sterility and dispensed onto dishes while still warm, before solidification. In the preparation of the antibiotic control, 1 mg of ampicillin was dissolved in 1 mL of distilled water. Then, 5 µL of this solution was diluted in 995 µL of BHI broth in an Eppendorf tube. A concentration of 5 µL/mL was thus obtained.

2.4.1. Bacteria Activation

The bacteria tested in the assays were activated in a 9 cm diameter Petri dish containing BHI agar for 24 h. After this period, approximately three colonies of each bacterium were transferred, with the aid of a sterile swab stick, to a test tube containing 3 mL of BHI broth, and then incubated for another 24 h. Their concentrations were standardized to obtain a culture medium with approximately 1.0 × 10⁴ CFU/mL [33].

2.4.2. Standardization of the Culture Media

A barium sulfate suspension was obtained by mixing solutions of H₂SO₄ 1% (9.95 mL) and BaCl₂ 1% (0.05 mL). Then, the turbidity of the test tube containing the bacteria was compared with the barium sulfate standard. After this standardization, the tube presented a concentration of approximately 1.0 × 10⁴ CFU/mL [33].

2.4.3. Sample Preparation

For sample preparation, 20 µL of L. origanoides essential oil was dissolved in 80 µL of dimethyl sulfoxide (DMSO). Then, 900 µL of sterilized and properly homogenized BHI broth was added to this solution.

2.4.4. Determination of the Minimum Inhibitory Concentrations (MICs)

Minimum inhibitory concentrations (MICs) were determined by the microdilution method, using 96-well plates arranged in twelve columns (1–12) and eight rows (A-H), with 100 µL of BHI broth added to each well. Then, 100 µL of the essential oil solution was poured into the first well of each column and homogenized. After that, successive dilutions were performed, removing 100 µL from the first well and transferring this volume to the next well, always homogenizing the final solution. This procedure was repeated until the penultimate well of each plate was filled, from which 100 µL was removed and discarded. The last row was used as control of the medium, and no essential oil was added to this solution. Finally, 5 µL of the bacterial suspension was poured into each well, and the plates were incubated at 37°C for 24 hours. Assays were performed in triplicate, and the results (concentrations) were expressed in µL/mL.

After the incubation time, the presence of microbial growth in the plates was verified by the presence of turbidity (red), so clear wells corresponded to no microbial growth. Results were verified with the aid of TTC dye (2,3,5-triphenyltetrazolium chloride). Plates without red coloration were re-inoculated and incubated at 37°C for 24 hours [34].

2.4.5. Determination of the Minimum Bactericidal Concentrations (MBCs)

After checking MIC, we verified the type of activity presented in each concentration of L. origanoides oil (bacteriostatic or bactericidal). The determination of the minimum bactericidal concentration (MBC) was performed by inoculation of Petri dishes containing BHI agar. Then, they were incubated at 37°C for 24 hours [35–37].

3. Results and Discussion

3.1. Yield and Chemical Composition of the Essential Oil

Approximately 0.6 mL of leaf essential oil was obtained, corresponding to an yield of 3%, which was higher than that obtained by Mar et al. [8]. The yield of L. origanoides may vary from 1 to 4.4% according to its geographical origin, extraction technique used, seasonal period, and rainfall rates [38–40]. Figure 1 shows the ion-chromatogram relative to the compounds identified in the essential oil of L. origanoides.

The chemical composition of L. origanoides essential oil is shown in Table 1. Oxygenated monoterpenes and monoterpene hydrocarbons were the major substances, which represented 56.57 and 35.73% of the compounds identified in this study, respectively. This result was similar to that observed by Mar et al. [8], in which the predominant class was also oxygenated monoterpenes (65%). Andrade et al. [41] also identified monoterpenes as the class with the highest concentration (90.3%) in the essential oil of L. origanoides collected in Minas Gerais (Brazil).

Ribeiro et al. [40] analyzed the chemical compositions of L. origanoides collected at different seasons of the year and found that the compound classes present in its essential oil may vary. For instance, monoterpene hydrocarbons, oxygenated monoterpenes, sesquiterpene hydrocarbons, oxygenated sesquiterpenes, and phenylpropanoids (cinnamates) may be present in the ranges of 9.4–46.5%, 13.5–62.2%, 17.5–31.0%, 3.3–52.8%, and 0.1–28.8%, respectively.

In the present study, we identified 28 compounds, whereas Stashenko et al. [38] found 139 substances in oils and extracts of L. origanoides. The major compounds found were 1,8-cineole (35.04%), carvacrol (11.32%), p-cymene (8.53%), α-pinene (7.17%), and β-terpinene (7.16%). Similarly, Tozin et al. [42], in samples of L. origanoides collected during the flowering period in the state of São Paulo (Brazil), identified 1,8-cineole as the main component. Also, in the work published by Da Silva et al. [43], the main substances found were 1,8-cineole (64.1%) and α-terpineol (12.0%), a result similar to that obtained by da Silva et al. [44].

In contrast, the chemical composition found in the present study was different from that of other publications. Carvacrol, for instance, was the major component found in L. origanoides collected in the city of Jardinópolis (São Paulo, Brazil), with a concentration of 26.28% [45]. In the essential oil of L. origanoides collected at Embrapa Western Amazon in Manaus (Amazonas, Brazil), the major compound was thymol (76.6%), whereas in L. origanoides collected in the city of Oriximiná (Pará, Brazil), the major compounds were carvacrol (38.6%) and thymol (18.5%) [46].

According to Rojas et al. [47], compound concentrations in the essential oils of L. origanoides may vary according to the collection period. For example, in June (rainy season), thymol and carvacrol had concentrations of 61.9 and 7.9%, respectively, whereas in February (dry season), their concentrations were approximately 44.7% and 16.8%, respectively. Also, Santos et al. [5] identified the following compounds at the highest concentrations in L. origanoides collected in the state of Piauí (Brazil): carvacrol (33.5–42.9%), γ-terpinene (8.0–10.5%), thymol (5.1–8.4%), methyl thymol (6.1–8.7%), and p-cymene (11.9–15.8%).

3.2. Antimicrobial Activity

The greatest antimicrobial activity was observed at the lowest values of MIC. Other authors also reported this behavior: MIC values ≤ 100 µg/mL indicate strong antimicrobial activity [48, 49]. Our best result for antimicrobial activity was 2.5 µL/mL against S. aureus strain, while the weakest was 5 µL/mL against E. coli. Several studies [5, 46, 50] have shown that the essential oil of L. origanoides presents activity against the microorganisms C. albicans, C. parapsilosis, C. guilliermondii, C. neoformans, T. rubrum, S. aureus (MRSA BMB9393), S. aureus, E. coli, L. casei, S. mutans, S. typhimurium, P. aeruginosa, B. cereus, and B. subtilis. However, they report that these activities may be related only to the presence of carvacrol and thymol.

The bacteria tested showed variable susceptibility to the different concentrations of essential oil (Table 2). L. origanoides showed bacteriostatic action in the concentration range of 2.5–10 μL/mL and bactericidal action against S. aureus beginning at 20 μL/mL. Regarding E. coli, the essential oil showed bactericidal action at concentrations starting from 5 μL/mL. Therefore, the MBC was 20 µL/mL for S. aureus and 5 µL/mL for E. coli. Studies on the chemical composition of L. origanoides essential oils have shown a great variety of components, such as thymol, β-caryophyllene, p-cymene (E)-nerolidol, trans-α-bergamotene, α-alaskene, α-pinene, α-humulene, caryophyllene oxide, and linalool [51]. This variety may be related to biological properties of the oil [52, 53], such as antimicrobial activity [54, 55].

According to Barreto et al. [56], L. origanoides essential oil in association with aminoglycosides may present a synergistic effect and be an appropriate alternative for antibiotic chemotherapy against diseases caused by methicillin-resistant Staphylococcus aureus (MRSA). Similarly, in a study on the potential antimicrobial effect of L. origanoides essential oil rich in thymol (76.6%) and ortho-cymene (6.3%) against Aeromonas hydrophila, Majolo et al. [54] obtained a MIC of 2500 μg/mL and a MBC of 2500 μg/mL.

Finally, the results obtained in this study indicated that one of the compounds responsible for the antimicrobial activity of L. origanoides essential oil may be 1,8-cineole, since several scientific publications have reported the antimicrobial properties of this substance [57–61]. For instance, Hendry et al. [57] obtained the following results using 1,8-cineole: MIC values of 16 µg/L (suspension) and 512 µg/L (biofilm) and MBC values of 256 µg/L (suspension) and >512 µg/L (biofilm) for S. aureus; MIC values of 64 µg/L (suspension) and 128 µg/L (biofilm) and MBC values of 64 µg/L (suspension) and 256 µg/L (biofilm) for E. coli.

Other compounds have had their antimicrobial activity reported. Studies have demonstrated that α-pinene also has antimicrobial activity against S. aureus and E. coli [62–64]. De Sousa et al. [65], for instance, obtained a MIC of 1.25 μl/mL and 2.5 μl/mL for α-pinene against S. aureus and E. coli, respectively. p-Cymene, another compound identified in the essential oil of L. origanoides, also has antimicrobial activity [66]. Namiecińska et al. [67] studied the antimicrobial effects of p-cymene on different strains. They obtained a MIC of 1000 μg/mL for S. aureus ATCC 29213, 62.5 μg/mL for S. epidermidis ATCC 12228, and 500 μg/mL for E. faecalis ATCC 29212. γ-Terpinene, in the work by Krist et al. [68], showed good antimicrobial activity, since the germ count decreased by 40%. In addition, carvacrol acted against several strains, such as E. coli, P. fluorescens, S. aureus, L. plantarum, B. subtilis, S. cerevisiae, and fungus B. cinerea [69]. Guarda et al. [70] studied the antimicrobial potential of carvacrol and obtained MIC values of 225, 225, 375, 75, and 225 μg/mL for S. aureus, L. innocua, E. coli, S. cerevisiae, and A. niger, respectively.

4. Conclusion

The chemical composition of the essential oil of L. origanoides Kunth collected during the flowering period proved to be rich in 1,8-cineole, indicating a possible correlation between the collection period and the biosynthesis of such a compound. We also observed a potential antimicrobial activity against Gram-positive and Gram-negative bacteria, suggesting a possible association of this behavior with the concentration of 1,8-cineole. Given the results, the essential oil of L. origanoides Kunth showed promising biological potential against pathogenic bacteria, thus encouraging further studies on substances isolated from this species to contribute to the development of new antimicrobial drugs.

Data Availability

The data sets used and/or analyzed during the current study are available from the corresponding author and will be delivered to responsible bodies on reasonable request.

Conflicts of Interest

The authors declare that there are no conflicts of interest.

Acknowledgments

Mozaniel Santana de Oliveira thanks PCI-MCTIC/MPEG as well as CNPq for the scholarship (process no. 302050/2021-3).

Supplementary Materials

This section contains data regarding collection and experiments. (Supplementary Materials)

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Copyright © 2021 Fabiana Paiva Ribeiro et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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