RESUMO

Eugenia copacabanensis and Myrciaria tenella are present in restingas of the Atlantic Forest, but little information is available about their chemical and biological potential. In this context, the hexane, dichloromethane, ethyl acetate and butanol fractions from the leaves of methanolic extract were analyzed by GC/MS and HPLC-DAD and the antioxidant potential was determined by DPPH and ABTS assays and using a Saccharomyces cerevisiae model. Dereplication allowed the identification of 68 compounds, 42 and 41 of which, respectively, are first reported here for E. copacabanensis and M. tenella. In vivo results revealed that the ethyl acetate and butanol fractions showed expressive antioxidant protection in the BY4741 and Δgsh1 strains, with greater impact on glutathione-deficient cells. With a high diversity of phenolic compounds, these polar fractions of E. copacabanensis and M. tenella leaves are potential protectors against intracellular oxidative stress.

Assuntos

RESUMO

Protium heptaphyllum is a plant widely distributed in Brazilian ecosystems that produce a resin which has pharmacological activities. In this study, the chemical composition, antimicrobial and antibiofilm activity, and the possible mechanism of action against the bacterium V. parahaemolyticus of essential oil from P. heptaphyllum (EOPH) were investigated. Twenty-two components were detected in EOPH, and ß-phellandrene (60.68%) had the majority. The inhibition halo, MIC, and MBC values were 11 mm, 2 mg/mL, and 8 mg/mL, respectively. Biofilm biomass inhibition and biomass reduction of the preformed biofilm were detected at 4 mg/mL EOPH concentration. The assays of cell constituent release and membrane permeability indicated that EOPH may disrupt the cell membrane, leading to leakage of intracellular constituent as reducing sugars and materials with an absorbance of 260 nm.

Assuntos

RESUMO

The passion fruit is propagated by seeds that have problems in their germination due to the presence of aryl which may contain inhibitory substances. The aim of this research was to identify the metabolites classes contained on the aril of yellow passion fruit. For this, after arils extraction, dichlorometane and methanol extracts were obtained. The Classes of metabolites were identified by phytochemical screening coupled with infrared spectroscopy and nuclear magnetic resonance (1H NMR) and extract fractions were obtained by fractionation on a column of silica gel. To evaluate the sensitivity of seeds to these substances, germination tests with lettuce seeds were installed. In aril extract obtained with dichloromethane, steroids and triterpenoids were identified and inhibition of seeds germination observed. In the methanol extract, reducing sugars were found and it was verified reduction of seeds germination.

O maracujazeiro amarelo é propagado por sementes que apresentam problemas na sua germinação devido à presença do arilo que pode conter substâncias inibidoras. O trabalho foi realizado com o objetivo de identificar as classes de metabolitos especiais contidas no arilo das sementes de maracujá amarelo. Para isso, após a extração do arilo das sementes de maracujá amarelo, foram obtidos os extratos de diclorometano e metanol. As classes foram identificadas por meio de prospecção fitoquímica aliada à análise de espectros de infravermelho e ressonância magnética nuclear de hidrogênio (RMN 1H) de frações dos extratos obtidas com fracionamento em coluna de gel de sílica. Para avaliação da sensibilidade das sementes a essas substâncias, foram instalados testes de germinação com sementes de alface. No extrato de arilo obtido com diclorometano, identificaram-se esteróides e triterpenóides, verificou-se inibição da germinação das sementes. No extrato metanólico, identificaram-se açúcares redutores e verificou-se redução da germinação das sementes.

RESUMO

The passion fruit is propagated by seeds that have problems in their germination due to the presence of aryl which may contain inhibitory substances. The aim of this research was to identify the metabolites classes contained on the aril of yellow passion fruit. For this, after arils extraction, dichlorometane and methanol extracts were obtained. The Classes of metabolites were identified by phytochemical screening coupled with infrared spectroscopy and nuclear magnetic resonance (1H NMR) and extract fractions were obtained by fractionation on a column of silica gel. To evaluate the sensitivity of seeds to these substances, germination tests with lettuce seeds were installed. In aril extract obtained with dichloromethane, steroids and triterpenoids were identified and inhibition of seeds germination observed. In the methanol extract, reducing sugars were found and it was verified reduction of seeds germination.

O maracujazeiro amarelo é propagado por sementes que apresentam problemas na sua germinação devido à presença do arilo que pode conter substâncias inibidoras. O trabalho foi realizado com o objetivo de identificar as classes de metabolitos especiais contidas no arilo das sementes de maracujá amarelo. Para isso, após a extração do arilo das sementes de maracujá amarelo, foram obtidos os extratos de diclorometano e metanol. As classes foram identificadas por meio de prospecção fitoquímica aliada à análise de espectros de infravermelho e ressonância magnética nuclear de hidrogênio (RMN 1H) de frações dos extratos obtidas com fracionamento em coluna de gel de sílica. Para avaliação da sensibilidade das sementes a essas substâncias, foram instalados testes de germinação com sementes de alface. No extrato de arilo obtido com diclorometano, identificaram-se esteróides e triterpenóides, verificou-se inibição da germinação das sementes. No extrato metanólico, identificaram-se açúcares redutores e verificou-se redução da germinação das sementes.