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1.
Data Brief ; 54: 110338, 2024 Jun.
Article in English | MEDLINE | ID: mdl-38590622

ABSTRACT

Tentative identification of secondary metabolites in Lantana camara L. leaves was done. This plant belongs to the verbenaceae family and is used for several treatments in folk medicine. The data was acquired by collecting leaves and their stems of L. camara manually, in Nampula city, during the flowering period around 4pm. Then, the plant material collected was washed with water to remove impurities, and it was covered by paper and dried in the sun for a week. After the drying process, it was crushed and sieved, and 200 g of homogeneous powder was obtained. The method of preparation of the leaf extract of L. camara was cold maceration, mixing 200 g of powder leaves with 2 L of 90 % ethanol, in the proportion of 1 g/10 mL, and it was stored in favourable conditions and stirred occasionally during a week. Then it was filtrated and divided into two parts so as to be dried in an oven at 80 °C for 8 h and another part was dried in a rotary evaporator at 42 °C for 6 h. Before drying the ethanolic extract, the yield of the dry extract was determined. The class of alkaloids, tannins, saponins, phenolic compounds and quinone were identified using general and specific chemical reagents. In addition, antibacterial action against Escherichia coli and Staphylococus aureus was evaluated using a disc diffusion method, according to Kirby-Bauer. These data provide helpful leads for pharmacological intervention from the extraction of the raw form of the metabolites, which is responsible for the antibacterial action specifically for the eradication of multidrug-resistant bacteria.

2.
Revise ; 7: 1-23, 20200000. ilus, tab, graf
Article in Portuguese | RSDM | ID: biblio-1355080

ABSTRACT

Securidaca longepedunculataé uma planta usada pela população moçambicana para o tratamento de doenças de origem bacteriana. Neste contexto, no presente trabalho realizou-se estudo fitoquímico e atividade antibacteriana dos extratos das raízes e folhas. Os extratos foram obtidos pormaceração hidroetanólica e água. Os testes fitoquímicos qualitativos foram realizados por reagentes específicos para cada metabólito secundário. A análise fitoquímica quantitativa foi feita por espectrofotômetro UV/VIS, onde, os alcaloides foram analisados a 366 nm, flavonoides a 415 nme taninos a 500 nm. A atividade antibacteriana foi avaliada com Escherichiacoli e Klebsiella pneumoniae, principais causadores de doenças no trato urinário e pulmonar respectivamente.Esta análise foi realizada através do método de difusão em disco, onde os microrganismos foram cultivados no meio ágar Mac Conkey. Como resultados,os flavonoides estiveram em maior concentração seguido de taninos e alcaloides. Os extratos aquosos da folha tiveram maior potencial inibitório, E.colirevelou ser a mais sensível em relação a K. pneumoniae, apesar de haver disparidade, a diferença de letalidade não foi significativa. O que comprova o uso desta planta na fitoterapia tradicional. Podem ser usadas as folhas para preservar a espécie.


Subject(s)
Humans , Plant Extracts , Securidaca , Phytochemicals , Plants , Therapeutics , Urinary Tract , Agar , Alkaloids , Escherichia coli , Klebsiella , Phytotherapy
3.
são Paulo; Revista Biociência; 2018. 8 p. tab, graf.
Non-conventional in Portuguese | RSDM | ID: biblio-1344396

ABSTRACT

O estresse oxidativo é uma irregularidade fisiológica considerada uma das responsáveis pelo envelhecimento do organismo humano e fator de risco para diversas doenças na maioria dos mamíferos. Nesta pesquisa avaliaram-se os efeitos do stress oxidativo induzido por peróxido de hidrogénio (H2O2) e menadiona em células de Saccharomyces cerevisiae BY4741. A cultura de células foi submetida em diferentes condições de stress por uma hora. A atividade de superóxido dismutase (SOD) foi analisada em gel de poliacrilamida nativo, a atividade da gliceraldeído 3-fosfato desidrogenase (GAPDH) foi avaliada através de NADH (Nicotinamida Adenina Dinucleótido Hidreto) a 340 nm, e a carbonilação de proteínas foi avaliada por quimioluminiscência. Constatou-se que 5 mM do H2O2 e da menadiona induziram alta redução da atividade enzimática de SOD e GAPDH, e elevou a taxa de carbonilação de proteínas.


Oxidative stress is a physiological irregularity, which is regarded to be one of the responsible for the human aging, as well as a risk factor for many diseases in most mammals. This study evaluated the effects of the oxidative stress induced by hydrogen peroxide (H2O2) and menadione in Saccharomyces cerevisiae BY4741 cells. Cell culture was submitted to different stress conditions for one hour. Superoxide dismutase (SOD) activity was analyzed on native polyacrylamide gel, the glyceraldehyde 3-phosphate dehydrogenase (GAPDH) activity was assessed by NADH (Nicotinamide Adenine Dinucleotide Hydride) at 340 nm, and protein carbonylation was evaluated by chemiluminescence. The findings show that 5 mM of H2O2 and menadione reduced the enzymatic activity of SOD and GAPDH. Furthermore, the rate of protein carbonylation increased


Subject(s)
Saccharomyces cerevisiae/cytology , Oxidative Stress/drug effects , Vitamin K 3/pharmacology , Glyceraldehyde 3-Phosphate , Hydrogen Peroxide/pharmacology , Superoxide Dismutase/adverse effects , Cell Culture Techniques , Glyceraldehyde-3-Phosphate Dehydrogenases/drug effects
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