This study evaluated the toxicity and antimicrobial activity in the face of Escherichia coli and Staphylococcus aureus of essential oils of Pimenta dioica Lindl. and Citrus sinensis L. The essential oils (EOs) were extracted by hydrodistillation, with chemical characterization by gas chromatography coupled and mass spectrometry (GC-MS). Physicochemical parameters were determined according to the Brazilian Pharmacopeia. The toxicity test followed the bioassay with Artemia salina Leach, the EOs approved in this assay followed to evaluate its biological properties. The antimicrobial activity followed the methodology described by the Clinical and Laboratory Standards Institute using the Disc Diffusion Method, Broth Dilution for Minimum Inhibitory Concentration (MIC) and subsequent minimum bactericide concentration for to evaluate the action of EOs against E. coli and S. aureus. Both EOs showed low toxicity, and thus were evaluated for the biological antimicrobial properties. Both EOs presented bactericidal potential against the microorganisms tested, showing satisfactory results for their action. The results indicate that the evaluated EOs are composed of substances that provide and encourage their application due to their potential for antimicrobial biological activity.

This article aims to evaluate the hygienic and sanitary quality of 60 samples of vegetables (Lactuca sativa and Nasturtium officinale) of conventional and hydroponic cultivation commercialized in São Luís (MA) and to evaluate the efficiency of conventional sanitizers. Microbiological analyses were performed based on the methodology described in the Compendium of Methods for the Microbiological Examination of Foods - APHA. Of the 60 samples analyzed, 95.00% (n=57) were in disagreement with the current legislation for coliforms at 45°C, and the presence of Escherichia coli was identified in both vegetables. All sanitizers presented inhibitory potential. Therefore, the satisfactory results obtained in this study ensure the use of sanitizers, emphasizing their viable cost, efficient and fast application.

Este estudo teve por objetivo determinar os constituintes químicos, toxicidade, potencial antioxidante e atividade larvicida do óleo essencial de Aniba rosaeodora Ducke frente a larvas de Aedes aegypti. O óleo essencial (OE) foi extraído por hidrodestilação a 100 ° C por 3h. Os parâmetros físico-químicos foram determinados e a composição química foi obtida por Cromatografia Gasosa acoplada à Espectrometria de Massas (GC / MS). A toxicidade foi realizada através do bioensaio de Artemia salina Leach. O ensaio ABTS e DPPH foram utilizados para avaliar a atividade antioxidante e para atividade larvicida submeteu-se larvas de Aedes aegypti a soluções do OE em concentrações de 10-100 mg L-1, onde avaliou-se a mortalidade das larvas e determinou-se a CL50 a partir do método de Reed Muech. O principal constituinte químico encontrado no EO de A. rosaeodora foi o β-linalool 63,16%, sendo considerado grande promissor para síntese farmacêutica. No ensaio de toxicidade, o LC50 variou de 582 mg L-1 a 282 mg L-1,  sendo classificado como não tóxico. O OE apresentou atividade larvicida com CL50 de 41,07 mg L-1 e atividade antioxidante relevante. De acordo com os resultados encontrados, foi possível avaliar que o OE analisado é composto por substâncias que possuem um bom efeito larvicida frente ao Aedes aegypti, incentivado assim seu potencial de aplicação.

This study evaluated the antimicrobial, antioxidant and toxicity activity of essential oils (EOs) of Hymenaea courbaril L. var. courbaril bark and Syzygium cumini (L.) Skeels leaves. The EOs were extracted by hydrodistillation and chemically characterized by gas chromatography coupled to mass spectrometry (GC/MS). The ABTS and DPPH assay were used to evaluate antioxidant activity. For the toxicity assay, lethality was evaluated against Artemia salina Leach. For the antimicrobial assay, the method of Disc Diffusion and Dilution in Broth was applied to obtain the minimum inhibitory concentration and minimum bactericidal. The major constituent of the EO of H. courbaril was β-ocimene (23.33%) and the EO of S. cumini was isocaryophyllene (18.01%). Both OE showed relevant antioxidant activity and low toxicity against Artemia salina. The EOs showed bactericidal activity against E. coli, S. aureus, P. aeruginosa, Salmonella sp., B. cereus and P. mirabilis. The results obtained are encouraged by the potential use of the OE's studied in the control and fight of pathogenic microorganisms.

This study evaluated the molluscicidal activity of essential oils (EOs) of Syzygium cumini L. and Hymenaea courbaril L. Hydrodistillation was used to extract the EOs. The chemical characterization was performed by Gas Chromatography coupled to mass spectrometry. The bioassay of Artemia salina Leach was used for the toxicity test. The molluscicidal assay tested concentrations of 10-80 mg L-1 of the EOs against Biomphalaria glabrata. The major constituent of The EO of S. cumini was isokaryophyllene and H. courbaril the Germacreno-D. The toxicity assay classified The EOs as nontoxic with LC50 412.10 mg L-1 for S. cumini and LC50 354.80 mg L-1 for H. courbaril. The molluscicidal assay purchased LC50 44.76/ LC90 77.20 for S. cumini and LC50 37.34 mg L-1/ LC90 73.24 mg L-1 for H. courbaril. The results showed that both EOs can be used as natural molluscicides in combating the snail Biomphalaria glabrata.