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Revista Brasileira de Saúde e Produção Animal

On-line version ISSN 1519-9940

Rev. bras. saúde prod. anim. vol.18 no.3 Salvador July/Sept. 2017 

Medicina Veterinária Preventiva

Chemical composition and antibacterial activity of essential oil and leaf extracts of Zanthoxylum caribaeum Lam. against serotypes of Salmonella

Composição química e atividade antibacteriana do óleo essencial e extratos vegetais das folhas de “Zanthoxylum caribaeum” Lam. frente a sorotipos de “Salmonella”

Juliete Gomes de Lara de SOUZA1 

Adrieli Gorlin TOLEDO1 

Camila Beatriz SANTANA1 

Camila Vogt dos SANTOS1 

Ana Paula MALLMANN1 

Jéssica Patrícia Borges da SILVA2 

Fabiana Gisele da Silva PINTO1  * 

1Universidade Estadual do Oeste do Paraná, Laboratório de Biotecnologia, Programa de Conservação e Manejo de Recursos Naturais, Cascavel, Paraná, Brasil.

2Universidade Estadual do Oeste do Paraná, Centro de Ciências Biológicas e da Saúde, Programa de Conservação e Manejo de Recursos Naturais, Cascavel, Paraná, Brasil.


The present study aimed to identify and quantify the components of the essential oil of Zanthoxylum caribaeum and to evaluate the antimicrobial potential of different plant extracts and the essential oil of this plant against different serotypes of Salmonella enterica, which is of greater occurrence and isolated in the western region of Paraná, Brazil. The extraction of the essential oil was performed using Clevenger apparatus and the chemical composition was determined by Gas Chromatography coupled to Mass Spectrometry (GC-MS). The extracts were obtained through different solvents (ethanol, methanol, hexane, acetone, dichloromethane, ethyl acetate and distilled water). The antibacterial activity was carried out according to the broth microdilution technique. The GC-MS analysis resulted in the identification of 15 main components, all terpenes, representing 63.88% of the total essential oil. The major compounds identified were Germacrene-D (20.77%), a-Panasinsene (14.40 %) and b-Selinene (11.68 %). The essential oil presented antibacterial activity against 5 serotypes of Salmonella enterica, with MIC and MBC ranging from 7000 to 437 μg.mL-1. While MIC and MBC from the range from 200 to 25 mg.mL-1, being effective to most serotypes of S. enterica, with the exception of the aqueous extract. The results suggest that the essential oil and leaf extracts of Z. caribaeum represent an alternative for the control of S. enterica in the poultry sector, in this way reflecting a new perspective for studies with natural products.

Key words: minimum bactericidal concentration; minimum inhibitory concentration; gas chromatography; microdilution; natural products


Objetivou-se com este estudo identificar e quantificar os constituintes do óleo essencial de Zanthoxylum caribaeum e avaliar o potencial antimicrobiano de diferentes extratos vegetais e do óleo essencial desta planta frente a diferentes sorotipos de Salmonella enterica, de maior ocorrência e isoladas na região oeste do Paraná, Brasil. A extração do óleo essencial foi realizada utilizando aparelho Clevenger e a composição química foi determinada por Cromatografia Gasosa acoplada a Espectrometria de Massas (CG-EM). Os extratos foram obtidos através de diferentes solventes (etanol, metanol, hexano, acetona, diclorometano, acetato de etila e água destilada). A atividade antibacteriana foi realizada segundo a técnica de microdiluição em caldo. As análises de CG-EM resultaram na identificação de 15 constituintes principais, todos terpenos, representando 63,88 % do total de óleo essencial. Os compostos majoritários identificados foram Germacreno-D (20,77 %), a-Panasinseno (14,40 %) e b-Selineno (11,68 %). O óleo essencial apresentou atividade antibacteriana frente a 5 sorotipos de Salmonella enterica, com CIM e CBM variando de 7000 a 437 µg.mL-1. Já os extratos variam a CIM e CBM de 200 a 25 mg.mL-1, sendo eficazes para a maioria dos sorotipos de S. enterica, com exceção do extrato aquoso. Os resultados sugerem que o óleo essencial e os extratos das folhas de Z. caribaeum representam uma alternativa para o controle de S. enterica, no setor avícola, refletindo uma nova perspectiva para estudos com produtos naturais.

Palavras-Chave: concentração bactericida mínima; concentração inibitória mínima; cromatografia gasosa; microdiluição; produtos naturais


Foodborne pathogens are widely diverse in nature and continue to be the major cause of global public health problems in both developed and developing countries. Among these pathogens is Salmonella, responsible for costs with medical care, loss of productivity and expenses with control by the food industry and, mainly, problems for the poultry industry (MAJOWICZ et al., 2010).

The Enteric serotypes usually are the disease causative, such as aviary paratyphoid, with Salmonella enterica subsp. enterica ser. Enteritidis and S. Typhimurium, which stand out in this subgroup, because they are important cause of problems related to food infections in humans (OLIVEIRA et al., 2013), especially in regard to poultry originated products, since eggs and meat are the main transmission path of the disease (KOTTWITZ et al., 2008).

In view of the above, natural products such as extracts and essential oils are an excellent resource for the search of new bioactive substances with biological potential, since they have a superior molecular diversity to synthetic products (SIQUEIRA et al., 2014).

The plant Zanthoxylum caribaeum Lam.belongs to the Rutaceae family, with more than 500 species it has worldwide distribution mainly in tropical and subtropical regions. Z. caribaeum is popularly known as espinho-preto (PIRANI& GROPPO, 2015) and has been widely used by the population for its anti-inflammatory properties (VILLALBA et al., 2007). It should be emphasized that there are few studies with this species and none of them are related to the biological action of it. However, according to Patinõ & Cuca (2011)Zanthoxylum spp. have such a broad ethnobotanical and biological importance, thus a promising source of substances with different biological activities.

Based on this context, the present study aimed at the chemical characterization of the essential oil and evaluation of the antibacterial activity of the oil and plant extracts of Z. caribaeum against different serotypes of Salmonella of poultry origin with higher incidence in the western region of Paraná, Brazil.


The experimental analyses were carried out at the Agricultural Biotechnology Laboratory in West of Paraná State University. The Leaves of Z. caribaeum were collected from January to April 2015, in the Paulo Gorski ecological park, situated in Cascavel city in the west of Paraná state, Brazil (24° 57'51" S 53° 26'2"W). An exsicate of the plant was incorporated in the West of Paraná State University Herbarium (UNOP) for botanical identification and registration of the voucher, under the number UNOP 1849.

For the essential oil extraction, 60 g of fresh Z. caribaeum plant material was added in 700 mL of distilled water and submitted to extraction by hydrodistillation for four hours using a Clevenger-type apparatus (SILVA et al., 2012). The essential oil collected was, dried over in hydrated sodium sulphate (~1 g), and stored under refrigeration and shelter from light at an average temperature of 4°C until analyzed.

The constituents of the essential oil were identified through gas chromatography coupled to mass spectrometry (GC-MS) and the identification of the compounds was performed by comparing their retention times with the retention times obtained in the literature (ADAMS, 2007).

To prepare the extracts, the leaves of Z. caribauem were dried and milled in knife mills according to Weber et al. (2014). For the preparation of the aqueous extract, 10 g of crushed plant material were added to 100 mL of distilled water. This mixture was kept on a rotary shaker at 220 rpm for 24 hours. After this period, the solution was filtered using Whatman nº. 1 paper filter and centrifuged for 15 minutes at 5000 rpm. The supernatant was collected, thus obtaining the extract at the final concentration of 100 mg.mL-1. The extract was stored at 4 ºC. The organic extracts were prepared according to Pandini et al. (2015) with modifications, ethanol (EtOH), methanol (MeOH), hexane (Hex), acetone (AcOH), dichloromethane (CH2Cl2) and ethyl acetate (EtOAc) were used as solvents.

Ten grams of ground vegetable material was added to 100 mL of the desired organic solvent, the solution then was maintained on a rotary shaker at 220 rpm for 24 hours. The solution was filtered using Whatman nº. 1 paper filter and centrifuged for 15 minutes at 5000 rpm. After collection of the supernatant, the extracts were submitted torota-evaporation. The crude extracts were diluted in 10 % dimethylsulfoxide (DMSO) until a final concentration of 400 mg.mL-1 and then stored at 4 ºC.

To evaluate the antibacterial activity, 11 serotypes of Salmonella enterica subsp. enteric of greater occurrence in the western region of the State of Paraná, Brazil: S. Enteritidis, S. Infantis, S. Typhimurium, S. Mbandaka, S. Orion, S. Shwarzengrund, S. Cubana, S. Montevideo, S. Senftenberg, S. Grumpensis e S. Tennessee provided by the veterinary laboratory MercoLab, Cascavel, Paraná, Brazil.

The minimum inhibitory concentration (MIC) of the essential oil and plant extracts was determined according to the broth microdilution method proposed by Scur et al. (2014). For the tests, each bacterial suspension was standardized with 1 × 105 UFC.mL-1 concentration. Both the essential oil and the plant extracts were solubilized in methanol (100%) and Mueller-Hinton broth (MHB). For the oil, concentrations were tested ranging from 7000 to 1.68 μg.mL- 1 and for plant extracts, concentrations of 200 to 0.09 mg.mL-1. Microbial wells were reserved for control of broth sterility (MHB only), bacterial growth (bacterial suspension and MHB), reference antimicrobial action (bacterial suspension, MHB and gentamicin 200 mg.mL-1) and solvent (bacterial suspension, MHB and methanol). From the wells that showed no visible bacterial growth prior to the addition of TTC 10% (triphenyltetrazolium chloride) (SCUR et al., 2014), an aliquot of 2 μL was drawn out and inoculated on the surface of MH agar medium. The plaques were incubated for 24 hours at 36 ± 0.1°C. After this period, MBC was defined as the lowest concentration of essential oil capable of causing the death of the inoculum (PANDINI et al., 2015).

The MIC and MBC of the essential oil and the extracts were classified according to the criteria proposed by Sartoratto et al. (2004). For the essential oil, the activity was classified as high (between 50-500 μg.mL-1), moderate (between 600 a 1.500μg.mL-1), low (above 1.500 μg.mL-1). For the extracts, the classification was high (≤12.5 mg.mL-1), moderate (12. 5 a 25 mg.mL-1), low (50 a 100 mg.mL-1) e very low (>100 mg.mL-1) Pandini et al. (2015).


The essential oil output obtained through hydrodistillation was 1,24 % for Z. caribaeum. Of the chemical constituents detected in the leaves essential oil, 60,92 % was sesquiterpenes e 2,96 % monoterpenes, representing a total of 63,88 %, the majority compounds being Germacrene D (20,77 %), a-Panasinsene (14,40 %) and b-Selinene (11,68 %) (Table 1).

Table 1 Chemical composition of the essential oil of the leaves of Z. caribaeum obtained by hydrodistillation e analised by GC-MS 

Compound TR Área (%) IK IK*
1 b- Mircene 16. 72 0.70 986.9 981 (1)
2 p-Cimene 18. 94 0.51 1020.0 1025 (1)
3 D-Limonene 19. 23 0.42 1024.2 1029 (3)

Hydrocarbonated Monoterpenes 1.63

4 a-Felandrene 17. 68 0.23 1002.0 993 (1)
5 Eucalyptol 19. 41 1.10 1026.8 1034 (2)

Oxygenated Monoterpenes 1.33

6 Copaene 42. 68 0.46 1367.3 1370 (1)
7 b-Bourbonene 43. 16 0.39 1374.5 1374 (1)
8 b-Elemene 43. 65 4.38 1381.9 1389 (4)
9 Cariofilene 47. 58 0.56 1444.4 1410 (1)
10 Germacrene D** 49. 17 20.77 1470.2 1476 (6)
11 b-Selinene** 49. 35 11.68 1473.2 1483 (1)
12 Eremofilene 49. 86 6.33 1481.5 1486 (5)
13 a-Panasinsene** 51. 40 14.40 1506.8 1518 (4)

Hydrocarbonated Sesquiterpenes 58.97

14 Espatulenol 54.76 1.29 1564.2 1563 (1)
15 a-Cadinol 59.28 0.66 1643.9 1642 (1)

Oxygenated Sesquiterpenes 1.95

16 Non Identified 50.06 20.30 1488.9 -

Total of compounds 84.18

**Manjority Compounds; TR: Retention Time; IK: Retention rates calculated values; *IK: Retention rate values found in literature

Among the eleven serotypes of Salmonella test, five were susceptible to the leaves essential oil of Z. caribaeum in the tested concentrations (Table 2). The essential oil showed inhibition to the serotypes Mbandaka Shwarzengrund Cubana, Senftenberg e Enteritidis, while the best action was reported about the serotype Senftenberg with a MIC 437.5 μg.mL-1 and MBC 1750 μg.mL-1, so the activity was considered elevated, according to the criteria of Sartoratto et al. (2004).

Table 2 Minimum Inhibitory Concentration (MIC) e Minimum Bactericidal Concentrarion (MBC) of the leaves essential oil of Z. caribaeum against serotypes of Salmonella enterica 

Serotype MIC / MBC (μg.mL-1)
Mbandaka 7000 / 7000
Shwarzengrund 1750 / -
Cubana 3500 / 7000
Senftenberg 437 / 1750
Enteritidis 7000 / 7000

(-) No Activity

Nanasombat & Wimuttigosol (2011) also demonstrated antimicrobial potential within the genus Zanthoxylum, being the essential oil of the species Z. limonella showing a MIC of 20 mg.mL-1 against the serotype S. Rissen. According to Gutierrez et al. (2008) this diversity of combinations of chemical constituents, presented by the essential oils, can manage to control bacteria that show consistently high resistance to antimicrobial agents, such as the case of the Salmonella genus.

The chemical profile of the oil revealed a high proportion of sesquiterpenes, especiallyhydrocarbonated sesquiterpenes. The essential oils, due to the lipophility of this substances of terpenic structure, allows the breaking of cell membrane lipids, thus increasing the permeability of the same (BAKKALI et al., 2008). This feature can increase the action of antimicrobials in cell interior, so justifying the activity encountered for the different serotypes of Salmonella.

However, the compounds that are found in lesser quantity, like in this case a-Felandrene e D-Limonene, can too contribute to the antimicrobial activity of the oils, it’s possible they are involved in a synergic action with other active compounds (FRUTUOSO et al., 2013).

The plant extracts that showed the best results in relation to de antimicrobial activity against the tested salmonellas were AcOH, AcEt e MeOH, because all of the eleven serotypes analised showed themselves sensitive to them (Table 3). The aqueous extract showed bacteriostatic activity only for S.Mbandaka, while the Hex and CH2Cl2 extracts didn’t show inhibitory action, only against the serotype S. Infantis. However, EtOH extract presented antimicrobial activity to 81. 81 % (9/11) of the serotypes tested, with the excpetion of S. Tennessee and S.Enteritidis.

Table 3 Minimum Inhibitory Concentration (MIC) e Minimum Bactericidal Concentrarion (MBC) of the different leaves extract of Z. caribaeum against the serotypes of Salmonella enteric 

Serotype MIC/MBC (mg.mL-1)

AcOH AcEt EtOH Hex MeOH CH2Cl2 Aq
Infantis 200/200 25/50 25/50 - 100/100 - -
Mbandaka 100/100 25/50 50/50 100/200 25/100 200/200 200 / -
Orion 50/50 25/25 50/50 50/100 25/50 200/200 -
Shwarzengrund 100/100 25/50 50/50 100/200 25/50 100/200 -
Cubana 25/50 25/25 50/50 100/100 100/100 200/200 -
Typhimurium 25/50 25/50 100/100 100/100 25/50 100/200 -
Montevideo 50/50 25/25 50/50 100/200 50/50 200/200 -
Senftenberg 25/100 50/50 50/50 200/200 50/100 200/200 -
Grumpensis 100/200 50/50 200/200 100/200 25/50 200/200 -
Tennessee 50/50 50/50 - 100/200 25/50 200/200 -
Enteritidis 100/100 25/25 - 100/100 25/50 100/200 -

Ethanolic extract (EtOH); Metanolic extract (MeOH); Hexanic extract (Hex); Acetone extract (AcOH); Dichloromethanic extract (CH2Cl2); Ethyl acetate extract (AcEt); Aquous extract (Aq); (-) No activity.

It was verified that, in general, AcEt extract presented the best values of MIC and MBC for the different serotypes of Salmonella which varied from 25 to 50 mg.mL-1, when compared to the other extracts, it’s activity being considered moderate to low. However, the serotypes Grumpensis e Tennessee (25 e 50 mg.mL-1) presented the most sensitivity to MeOH extract.

In the literature, wasn’t found studies regarding the antimicrobial activity of the plant extracts of Z. caribaeum against the serotypes of Salmonella. However, Zhang et al. (2014) reported the antimicrobial potencial whitin the genus against Gram-negative bacteria. According to the autors, ethanolic extract, ethyl acetate, acetone and methanolic of Zanthoxylum bungeanum showed MIC of 4.61 mg.mL-1, 2.32 mg.mL-1, 5.7 mg.mL-1 and 3.1 mg.mL-1, respectively, against the strain E. coli, corroborating with our study.

Among the extracts tested, the AcEt presented wide spectrum of antimicrobial action, showing activity for different serotypes of Salmonella. The AcEt is a solvent of medium polarity, a trait that enables the extraction of the following chemical classes: flavonoids, tanines, xanthenes, triterpenic acids, saponines and fenolic compounds in general (CECHINEL-FILHO & YUNES, 1998). The antimicrobial activities of some plant extracts are due to the high grade of fenolic compounds (AL-HABIB et al., 2010; KUMAR et al., 2011).

Still, it can be noticed that the usage of solvents with different polarities in the achievment of the extracts, promoted a diferenciated antimicrobial activity, being that such activity might be related to the action of several phytochemical constituents of the plant. Therefore, raw extracts of vegetal species can. many times, present a freater antimicrobial action against pathogens, due to the sinergism between the bioactive compounds that are extracted by the solvent or according the method of extraction emplyed (LEE & LEE, 2010; DELGADO-ADÁMEZ et al., 2012).

Besides that, the different susceptibility presented by the serotypes of Salmonella enterica is commonly reported in the literature, can be explained by the defense mechanisms present in this Gram-negative bacteria. This elevated genetic variability that genus Salmonella exhibit, is resulting of a dynamic interaction between the pathogens, the environment and the different hosts (LIU et al., 2011; SCUR et al., 2016).

Lastly, it is concluded that the essential oil and the plant extracts of the leaves of Z. caribaeum present bioactive constituents with antimicrobal activity for different serotypes of Salmonella enterica, suggesting its future potentialities for the poultry sector, in search of safety and quality of the food consumed, as well as, new perspectives for studies with natural products in the industry.


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Received: May 15, 2017; Accepted: August 14, 2017

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