RESUMO:Adulterações da matéria-prima vegetal ocorrem comumente no mercado de fitoterápicos, sob a forma de substituições e/ou falsificações. Muitas vezes, espécies distintas são comercializadas em substituição à farmacopéica devido à dificuldade de obtenção desta, ou mesmo pelo emprego intencional de espécies de menor valor econômico que apresentem características morfológicas semelhantes. Portanto, faz-se necessária a realização de estudos que busquem identificar a constituição química das espécies de amplo uso medicinal, que são alvos de adulterações. Mikania glomerata e Mikania laevigata, conhecidas popularmente como "guaco", são comercializadas indistintamente. Buscando-se avaliar a composição química das duas espécies, realizou-se uma prospecção fitoquímica por CCD e foram obtidos os perfis cromatográficos por CLAE-FR. Fez-se a quantificação da cumarina empregando-se o mesmo método. Na prospecção fitoquímica por CCD, foi detectada, nas duas espécies, a presença de cumarina, triterpenos/ esteróides e heterosídeos flavônicos. Os perfis cromatográficos, obtidos por CLAE-FR, mostraramse semelhantes, observando-se a predominância de compostos polares. Na quantificação da cumarina, obtêve-se um teor de 0,30% para M. glomerata e 0,43% para M. laevigata, teores de acordo com o preconizado na monografia do guaco-cheiroso (mín. 0,1%). M glomerata e M. laevigata apresentaram composição química semelhante e teores de cumarina próximos, sugerindo que estas podem ser utilizadas de forma indistinta.Unitermos: Mikania glomerata, Mikania laevigata, Asteraceae, guaco, cumarina.ABSTRACT: "Comparative study of the chemical composition of the species Mikania glomerata Sprengel and Mikania laevigata Schultz Bip. ex Baker". Adulterations of plant raw materials often occur in the marketing of herbal medicine, usually in the form of substitutions and/ or fakes. Many times, different plant species are commercialized in the place of the one recognized by the pharmacopoeia. This may occur due to the difficulties of obtaining the authentic plant material, or by an intentional use of a plant species that has less economic value but shows similar morphologic features. Therefore, it is necessary to carry out studies that can identify the chemical composition of those species of wide medicinal use, which are the targets of adulterations. Mikania glomerata and Mikania laevigata, popularly known as "guaco", are indistinctly commercialized in Brazil. A phytochemical screening by TLC was carried out to evaluate the chemical composition of both species. The RP-HPLC profiles were obtained and the quantification of coumarin was determined by the same method. A phytochemical screening has shown that coumarin, triterpenes/ steroids and flavonic heterosides are the constituents detected in both species. The RP-HPLC profiles were similar between the two species and revealed the predominance of polar compounds. In the quantification of coumarin, a content of 0.30% (w/w) was obtained for M. glomerata and 0.43% (w/w) for M. laevigata. These values are i...
Polygonum spectabile is used in Brazil for treatment of several infection diseases. Extracts and constituents isolated from this species were evaluated for cytotoxicity and effects on 15 bacterias and yeasts as well on 4 viruses strains (HHV-1, VACV-WR, EMCV, DEN-2). Less polar extracts were effective against Staphylococcus aureus, Bacillus subtillis, Micrococcus luteus, M. canis and Tricophyton mentagrophytes and T. rubrum. Two known chalcones and 3-O-β-D-glucosyl-β-sitosterol were isolated. The ethanol extract was the only one to show antiviral activity (CE50 < 30 μg/ml). One chalcone has inhibited the growth of several bacteria and was significantly active against dermathophytes. The 3 compounds isolated have shown moderate cytotoxicity against Vero and LLCMK(2) cells (CC(50) < 50 μg/ml). These results support the use of P. spectabile as antimicrobial agent.
RESUMO: O mercado brasileiro de fitoterápicos encontra-se em crescente expansão, porém a falta de padronização e a má qualidade da matéria-prima vegetal constituem um problema crucial na produção de fitoterápicos de qualidade. Neste trabalho, foram avaliadas drogas vegetais constituídas de folhas (amostras A, B, C) e tinturas (amostras D, E, F) de guaco, adquiridas no Mercado Central e em farmácias de manipulação de Belo Horizonte, respectivamente. Realizaram-se testes físico-químicos de caracterização organoléptica, determinação de matéria estranha, teores de água e cinzas totais para as amostras de drogas vegetais e caracterização organoléptica, medidas de pH e de densidade para as amostras de tinturas. Foram obtidos os perfis cromatográficos por CCD e CLAE-FR e fez-se a quantificação da cumarina (marcador químico), por CLAE-FR. As amostras analisadas apresentaram um ou mais dos parâmetros avaliados fora dos valores preconizados pela farmacopéia brasileira, evidenciando-se a necessidade da realização do controle de qualidade de matérias-primas vegetais, para se obter medicamentos fitoterápicos de qualidade, eficientes e seguros.Unitermos: Guaco, controle de qualidade, cumarina, quantificação, CLAE-FR.ABSTRACT: "Evaluation of the quality of commercial samples of leaves and tinctures of guaco". The Brazilian market of herbal medicine is in increasing expansion; however, the lack of standardization and the bad quality of the plant raw materials constitute a crucial problem for the production of quality herbal medicines. In this work, herbal drugs consisting of leaves (samples A, B, C) and tinctures (samples D, E, F) of guaco purchased in the Central Market and from pharmacies in Belo Horizonte, respectively, were evaluated. Physical-chemical tests such as organoleptic characterization, determination of foreign matter, total ash and water content were performed on the samples of herbal drugs. The organoleptic characterization, measures of pH and density of the tincture samples were also determined. TLC and RP-HPLC profiles of the herbal drugs and tinctures were obtained and the quantification of coumarin (used as a marker compound) by RP-HPLC was determined. The analyzed samples showed one or more of the evaluated parameters outside of the values recognized by the Brazilian Pharmacopoeia. This demonstrates the need for the quality control of the plant raw materials, in order to guarantee quality and safety in herbal medicine.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.