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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.

Os subprodutos de frutas são os resíduos alimentares mais abundantes, sendo descartados ou usados como ração ou na compostagem, são grandes fontes de bioativos com potencial de reaproveitamento. O objetivo deste trabalho foi a busca de estudos com os resíduos agroindustriais oriundos das espécies Persea americana e Theobroma grandflorum e identificar alternativas para reduzir a perda. Trata-se de uma revisão integrativa no qual foi desenvolvida a partir da análise de estudos encontrados em 2 bases de dados: PubMed e Google Scholar. Foram selecionados trabalhos que testaram a atividade biológica das espécies Persea americana e Theobroma  grandiflorum utilizando extratos vegetais. Bem como foram identificados trabalhos que envolviam o desperdício alimentar e possíveis alternativas para minimizar o impacto ambiental. As duas espécies demonstram ações biológicas significativas para o combate ao estresse oxidativo. A humanidade requer práticas sustentáveis da indústria agrícola para o reaproveitamento de resíduos orgânicos como estratégia para a redução do desperdício de alimentos além de gerar ações biológicas de grande impacto.

This study aimed to determine total phenolics, assess toxicity and antimicrobial activity of essential oil (EO) of Alpinia zerumbet leaves. The EO was extracted by hydrodistillation and the physicochemical parameters were determined according to the Brazilian Pharmacopoeia. The toxicity assay followed the lethality bioassay against the non-target organism Artemia salina Leach. The antimicrobial activity followed the methodology described by the Clinical and Laboratory Standards Institute using the Method of Disc Diffusion and Broth Dilution to determine the Minimum Inhibitory Concentration (MIC) for the action of EE against Escherichia coli, Staphylococcus aureus, Aspergillus sp. and Penicilium sp. OE yield was 0.71%. Lethal Concentration 50% (LC50) for the action of EO against Artemia salina L. 280.40 mg/L, being considered nontoxic. Through the antimicrobial assays, the OE presented bactericidal activity against the bacteria E. coli and S. aureus,and fungicide activity against the fungi Aspergillus sp. and Penicillium sp. It was concluded that the EO has a good antimicrobial potential, and its application is appreciated by its classification as nontoxic OE..