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.
Extraído quantitativamente o óleo essencial por destilação a vapor. O óleo essencial obtido LC50 de 39,81 (± 0,17). Os resultados indicam que o óleo essencial avaliado é composto de substâncias que fornecem atividade contra moluscicida no combate ao caracol transmissor esquistossomose. Palavras Chave: Óleo; Caramujo; Moluscicida.Extracted quantitatively the essential oil for hydrodistillation. The essential oil obtained LC50 of 39.81 (±0.17). The results indicate that the rated essential oil is composed of substances that provide activity against molluscicide in combating schistosomiasis transmitter snail.
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.
This study aimed to evaluate the larvicidal activity of essential oil microparticles (EO) of Melissa officinalis L. against Aedes aegypti. The leaves of M. officinalis were collected in the municipality of São José de Ribamar, Maranhão, Brazil, later dried, crushed and ground. 90g of the dried leaves were used to obtain the EO by the hydrodistillation method. For the synthesis of microencapsulated EO, 60g of sodium alginate (2.5% m/v) was added to the mixture of 15g of Tween 20 with 6g of EO. The mixture was homogenized and drips over CaCl2 5% m/v solution for the hardening of particles via crosslinking. The microparticles were washed with distilled water in filter and dried at 35ºC/24h and 15 days at tamb (30ºC). The eggs of Aedes aegypti were collected at the Federal University of Maranhão by the ovitrampas method. The larvae that hatched were fed until they reached the fourth instar. Groups of larvae (n=20) were submitted to solutions of EO and microparticles of 10-90 mg/L . After 24 h, live and dead larvae were counted and LC50 was calculated by the Reed&Muench method, using Cheng's criterion for classification of active potential. All larvae presented mortality in all concentrations tested. The LC50 obtained for the EO was 40.60 mg/L and for the microparticles 22.10 mg/L, both classified as active according to the adopted criterion, but it is observed that the microparticles increased the larvicidal potential of the EO. Through the results obtained, it is concluded that the microparticles formulated with the EO proved to be efficient in the face of the larvae of Aedes aegypti, being interesting and important in controlling and combating the mosquito that transmits dengue.
There are many food-borne pathogens in the wild and they are considered the cause of serious public health problems in both developed and developing countries. The use of natural products, such as antimicrobial compounds, has been increasing, in an attempt to control bacteria present in foods, mainly pathogens resistant to conventional antibiotics. This chapter is intended to provide the antimicrobial and antioxidant activity of essential oils of Cinnamomum zeylanicum (cinnamon), Origanum vulgare (oregano), Zingiber officinale (ginger), Rosmarinus officinalis (rosemary), Citrus latifolia (tahiti lemon) and Curcuma longa (saffron) as well as to determinate its chemical composition. The oils had been extracted by hydrodistillation with a Clevenger type apparatus and the antimicrobial activity was performed against standard strains Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus. The antioxidant activity was carried out using the ABTS [2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)] method. The essential oils presented a mixture of mono-and sesquiterpenes. The best minimum inhibitory concentration was determined to C. zeylanicum against S. aureus. O. vulgare antioxidant activity presented inhibition of 90.74% and EC 50 of 14 μg mL −1 . These results demonstrate that the essential oils analyzed presented efficient antibacterial activity and antioxidant action being able to satisfy the demand of use as control of microorganisms in the food.
In this study, we investigated the main constituent, the predominant class and biological activity of the essential oil extracted from the leaves of Pimenta dioica and the pattern of the major constituent against larvae in the third stage of Aedes aegypti. For this reason, we extracted the oil by hydrodistillation, identified its components by gas chromatography coupled with mass spectrometry (GC/MS) and calculated the lethal concentration (LC50) of the larvicidal activity using the Reed-Muench method. The results show that the oil consists mainly of eugenol, in which the phenylpropanoid class predominated and the lethal concentration, LC50, was 38.86 μg mL-1at a confidence level of 2.25 μg mL-1, while the eugenol standard presented LC5079.75 μg mL-1at a confidence level of 2.10 μg mL-1. Given the facts, we conclude that the oil is more active than the standard and that it has the potential to replace chemical larvicides.
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.
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