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Arquivo Brasileiro de Medicina Veterinária e Zootecnia

Print version ISSN 0102-0935

Arq. Bras. Med. Vet. Zootec. vol.63 no.5 Belo Horizonte Oct. 2011

http://dx.doi.org/10.1590/S0102-09352011000500026 

COMMUNICATION

 

Activity of essential oils from spices against Staphylococcus spp. isolated from bovine mastitis

 

Atividade de óleos essenciais de plantas condimentares frente Staphylococcus spp. isolados de mastite bovina

 

 

M. Dal PozzoI; D.F. SanturioII; L. RossattoII; A.C. VargasIII; S.H. AlvesII; E.S. LoretoII; J. ViegasI

IAluno de pós-graduação - Universidade Federal de Santa Maria, Santa Maria, RS
IIUniversidade Federal de Santa Maria, Santa Maria, RS
IIIUniversidade Federal de Santa Maria, Santa Maria - Campus/Camobi, Pr

 

 


Keywords: medicinal plants, phytotherapy, antimicrobials


RESUMO

Avaliou-se a atividade antimicrobiana dos óleos essenciais (OE) de Origanum vulgare (orégano), Thymus vulgaris (tomilho), Lippia graveolens (lipia), Zingiber officinale (gengibre), Salvia officinalis (sálvia), Rosmarinus officinalis (alecrim) e Ocimum basilicum (manjericão), e de suas frações majoritárias, carvacrol e timol, frente a 32 isolados de Staphylococcus spp, oriundos de rebanhos leiteiros bovinos. A concentração inibitória mínima (CIM) e a concentração bactericida mínima foram determinadas por meio da técnica de microdiluição em caldo. Orégano, tomilho e lípia (Orégano Mexicano) apresentaram atividade antimicrobiana similar, médias geométrica de CIM de 1600µg mL-1; 1564µg mL-1; 1562µg mL-1, respectivamente, no entanto menos ativos que carvacrol, 584µg mL-1 e thymol, 427µg mL-1. Isolados com diferentes perfis de susceptibil idade aos antimicrobianos usados no tratamento de mastite bovina, quando subagrupados, foram inibidos por concentrações semelhantes de OE . Estes resultados confirmam a atividade antimicrobiana de OE e algumas frações majoritárias.

Palavras-chave: plantas medicinais, fitoterapia, antimicrobianos


 

 

Worldwide, economic losses due to mastitis have been estimated at $35 billion (Wellenberg et al., 2002). Staphylococcus spp. is the main causative agent of bovine mastitis, with higher prevalence in cases of clinical and subclinical manifestations (Fagundes et al., 2010). The most common treatment is based on intramammary infusion of antibacterial agents. However, cure rates obtained with such drugs are not always effective, because it may determine the emergence of resistant bacteria (Zafalon et al., 2007) as well increase amounts of antibiotic residues in milk (Fagundes et al., 2010). Nevertheless, the treatment of bovine subclinical mastitis caused by S. aureus in the lactation can be economically unviable (Zafalon et al., 2007).

Alternative treatments to bovine mastitis with bacteriocins (Pieterse et al., 2010) and plant derived compounds (Baskaran et al., 2009; Mubarack et al., 2011) have been described. Essential oils (EO) are classified as GRAS (generally regarded as safe), show antibacterial proprieties and resistance has not been reported after prolonged exposure. Then, the investigation of their antimicrobial activity against bacterial agents of mastitis is justifiable. In this context, this study aimed to: a) evaluate the in vitro antimicrobial activity of EO from spices against Staphylococcus spp.; b) compare the activity of EO against Staphylococcus spp.isolates with multiple profiles of susceptibility and resistance to penicillin, erithromicin and tetracycline antibiotics.

Thirty two isolates from bovine mastitis, from the Laboratório de Bacteriologia Veterinária, Universidade Federal de Santa Maria, Brazil, were studied. The isolates were identified as coagulase positive Staphylococcus spp. The standard strain S. aureus ATCC 29213 was employed as reference strain. The antimicrobial susceptibility tests were performed according to CLSI M31-A3 agar diffusion method (CLSI, 2008). Based on these tests, the isolates were divided into subgroups according to the following resistance profiles: 1) susceptible; 2) penicillin-resistant; 3) tetracycline and penicillin-resistant; 4) erythromycin and tetracycline-resistant, and 5) erythromycin, penicillin and tetracycline-resistant.

The EO were purchased from Essential7.com Roewell, NM, USA. The majority constituents were previously determined by Pozzatti et al. (2010).

The essential oil of Origanum vulgare (oregano) contains 92% of carvacrol; Thymus vulgaris (thyme), 64% of γ-terpinene; Lippia graveolens (Mexican oregano), 56.8% of carvacrol and 32.2% of o-cymene; Rosmarinus officinalis L. (rosemary), 28.6% of 1,8-cineole and 26.31% of camphor; Salvia officinalis L. (sage), 40.6% of cis-thujone; Ocimum basilicum L. (Basil), 32.2% of linalool and 23.6% of 1,8-cineole; Zingiber officinale (ginger), 20.8% of zingiberene. The majority constituents were purchased from Acros Organics, Fair Lawn, NJ, USA.

Carvacrol (99.5% carvacrol), thymol (thymol 99.0%) and cineole (cineole 97.0%) EO were first diluted with methanol to achieve the concentration of 640mg/mL (Solution I) and then diluted to 1:100 in Mueller-Hinton broth, resulting in the concentration of 6,400µg mL-1 (Solution II).

The minimal inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined based on the document M31-A3 (CLSI, 2008). Briefly, the inoculum was prepared from cultures grown in Muller-Hinton agar, resulting in a bacterial suspension in saline equivalent to the 0.5 McFarland standard (1x108 CFU mL-1). The solution II was distributed into wells of a microtiter plate and serial dilutions were prepared to obtain final concentrations from 6,400 to 100µg mL-1. Inoculum volumes of 10µL were distributed in each well containing EO incorporated into Mueller-Hinton broth. The MICs were determined after incubation at 35ºC/24h under aerobic conditions. These tests were performed in triplicate. To determine the MBC, volumes of 10µL from wells without visible bacterial growth after 24h incubation were transferred to the surface of Mueller-Hinton agar, which was incubated at 35ºC/24h. Then, bacterial growth was observed, registering the lowest concentration of EO or majority compounds that did not show bacterial growth. These tests were performed in triplicate.

The Mann Whitney test was used to compare two independent samples in order to observe whether the different study groups had similar patterns of susceptibility or not.

The geometric means (GM) of the MICs and MBCs of EO against Staphylococcus spp. were [GM-MIC/GM-MBC]: Origanum vulgare [1600/2288µg mL-1], Lippia graveolens [1562/2707µgmL-1], Thymus vulgaris [1564/2370µg mL-1], carvacrol [584/732µg mL-1] and thymol [427/856µg mL-1]. In this study, ginger, basil, rosemary and sage EO, and the major compound cineole showed no antibacterial activity at the tested concentrations against the microorganisms evaluated. The GM of MICs and MBCs indicated that oregano, thyme and Mexican oregano EO were equally active (P>0.05) but less active than carvacrol and thymol (P<0.001) (Table 1). Based on the antimicrobial susceptibility, significant differences were not observed between susceptibilities profile of subgroups (Table 2).

The remarkable antimicrobial activity of O. vulgare, L. graveolens and T. vulgaris against Staphylococcus spp. from multiple sources has been previously confirmed (Smith-Palmer et al., 1998; Hoferl et al., 2009). These studies reported significant antimicrobial activity of oregano EO against Gram positive and Gram negative bacteria, including Staphylococcus aureus. Arana-Sanchez et al. (2010) showed antimicrobial activity of L. graveolens against E. coli ATCC 11229 and Staphylococcus species. The phenolic compounds carvacrol and thymol as major constituents ensure such activities. This activity had also been reported against sensible and resistant yeasts to fluconazole (Pozzatti et al., 2010).

Rosemary, sage, basil and ginger EO, and the major constituent cineole did not show antimicrobial activity at the studied concentrations. However, Viuda-Martos et al. (2008) and Delamare et al. (2007) reported antimicrobial activity of sage and rosemary EO against Staphylococcus spp., Enterobacter gergoviae, E. amnigenus, Lactobacillus sakei, and Lactobacillus curvatus. The disparity between the results of the present study and those reported by these authors can be attributed to the composition of the EO or the techniques employed. The lack of an internationally standardized technique to evaluate antimicrobial activity of EO and plant extracts invalidate the comparison of some studies.

In this study, the antimicrobial activities of EO against the subgroups of Staphylococcus species with different antibiotic susceptibility profiles were partially independent of the pattern of antibacterial resistance which is in agreement with other authors. Mahboubi et al. (2010) reported that the Zataria multiflora EO - Iranian condiment similar to thyme) consisting of thymol (38%), carvacrol (15.3%) and p-cymene (10.2%), showed similar antimicrobial activity against methicillin resistant Staphylococcus aureus as well to sensitive susceptible stains. Against fluconazole-sensible and resistant Candida spp., Pozzatti et al. (2010) reported significant antifungal activities of EO regardless of the previous susceptibility of those yeasts to antifungal agents.

The finding that the activities of oregano, thyme and Mexican oregano EO, and majority constituents carvacrol and thymol are independent of resistance to antibacterials tested, reinforces the status of EO as alternative candidates to be considered in the therapy of bovine mastitis.

In conclusion, this study demonstrated that essential oils of oregano, thyme, Mexican oregano, as well as the major constituents thymol and carvacrol showed antimicrobial activity against Staphylococcus spp. and that the EO of oregano, thyme and Mexican oregano exhibited similar antimicrobial activities (MICs and MBCs), but lower than major constituents thymol and carvacrol. The activities of EO were similar against subgroups of isolates, independently of the resistance to antimicrobials used for treatment of mastitis.

 

REFERENCES

ANTIMICROBIAL disk and dilution susceptibility tests for bacteria isolated from animals, Approved Standard. 3ed., PA: Wayne, PA, 2008.         [ Links ]

ARANA-SANCHEZ, A.; ESTARRÓN-ESPINOSA, M.; OBLEDO-VÁZQUEZ, E.N. et al. Antimicrobial and antioxidant activities of Mexican oregano essential oils (Lippia graveolens H.B.K.) with different composition when microencapsulated in beta-cyclodextrin. Lett. Appl. Microbiol., v.50, p.585-590, 2010.         [ Links ]

BASKARAN, S.A.; KAZMER, G.W.; HINCKLEY, L. et al. Antibacterial effect of plant-derived antimicrobials on major bacterial mastitis pathogens in vitro. J. Dairy Sci., v.92, p.1423-1429, 2009.         [ Links ]

DELAMARE, A.P.L.; MOSCHEN-PISTORELLO, I.T.; ARTICO, L. et al. Antibacterial activity of the essential oils of Salvia officinalis L. and Salvia triloba L. cultivated in South Brazil. Food Chem., v.100, p.603-608, 2007.         [ Links ]

FAGUNDES, H.; BARCHES, L.; NADER FILHO, A. et al. Occurrence of Staphylococcus aureus in raw milk produced in dairy farms in São Paulo State, Brazil. Braz. J. Microbiol., v.41, p.376-380, 2010.         [ Links ]

HÖFERL, M.; BUCHBAUER, G.; JIROVETZ, L. et al. Correlation of antimicrobial activities of various essential oils and their main aromatic volatile constituents. J. Essent. Oil Res., v.21, p.459-463, 2009.         [ Links ]

MAHBOUBI, M.; BIDGOLI, F.G. Antistaphylococcal activity of Zataria multiflora essential oil and its synergy with vancomycin. Phytomedicine, v.17, p.548-550, 2010.         [ Links ]

MUBARACK, H.M.; DOSS, A.; DHANABALAN, R. et al. Activity of some selected medicinal plant extracts against bovine mastitis pathogens. J. Anim. Vet. Adv., v.10, p.738-741, 2011.         [ Links ]

PIETERSE, R.; SVETDSLAV, T.D.; DICKS, L.M.T. Mode of action and in vitro susceptibility of mastitis pathogens to macedocin ST91KM and preparation of a teat seal containing the bacteriocin. Braz. J. Microbiol., v.41, p.133-145, 2010.         [ Links ]

POZZATTI, P.; LORETO, E.S.; LOPES, P.G.M. et al. Comparison of the susceptibilities of clinical isolates of Candida albicans and Candida dubliniensis to essential oils. Mycoses, v.53, p.12-15, 2010.         [ Links ]

SMITH-PALMER, A.; STEWART, J.; FYFE, L. Antimicrobial properties of plant essential oils and essences against five important food-borne pathogens. Lett. Appl. Microbiol., v.26, p.118-122, 1998.         [ Links ]

VIUDA-MARTOS, M.; RUIZ-NAVAJAS, Y.; FERNÁNDEZ-LÓPEZ, J.; PÉREZ-ÁLVAREZ, J. Antibacterial activity of different essential oils obtained from spices widely used in Mediterranean diet. Int. J. Food Sci. Tech., v.43, p.526-553, 2008.         [ Links ]

WELLENBERG, G.J.;VAN DER POEL, W.H.M.; VAN OIRSCHOT, J.T. Viral infections and bovine mastitis: a review. Vet. Microbiol., v.88, p.27-45, 2002.         [ Links ]

ZAFALON, L.F.; NADER FILHO, A.; OLIVEIRA, J.V. et al. Subclinical mastitis caused by Staphylococcus aureus: cost benefit analysis of antibiotic therapy in lactating cows. Arq. Bras. Med. Vet. Zoo tec. , v.59, p.577-585, 2007.         [ Links ]

 

 

Recebido em 15 e junho de 2011
Aceito em 1 de setembro de 2011

 

 

E-mail: marcelodalpozzo@yahoo.com.br

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