Influence of environmental factors on the concentration of phenolic compounds in leaves of Lafoensia pacari

Abstract

Lafoensia pacari A. St.-Hil., Lythraceae, a plant from the Cerrado known as pacari or dedaleiro, is widely used as an antipyretic, wound healing, antiinflammatory, antidiarrheal and in the treatment of gastritis and cancer. Notable among the metabolite groups identified in leaves of L. pacari are the polyphenols, such as tannins and flavonoids, related to the pharmacological activities of pacari. Studies on the influence of environmental factors over production of major groups of secondary metabolites in pacari are important because they contribute data for its cultivation and harvest, and establish quantitative parameters of secondary metabolites in the plant drug. The objective of this study was to evaluate the influence of environmental factors on concentrations of phenolic metabolites in the leaves of L. pacari. Compounds quantified in the leaves were: total phenols, tannins by protein precipitation, hydrolysable tannins, total flavonoids, ellagic acid and mineral nutrients, while soil fertility was also analyzed, all over a period of one year. The data were analyzed using multivariate analysis, and the results suggest that metabolite concentrations in the leaves of this plant are influenced by seasonal factors, in particular the temperature and foliar micronutrients (Cu, Fe, Mn, Zn).

Interferência entre plantas daninhas e a cultura: alterações no metabolismo secundário

“…As concentrações de metabólitos secundários, como os compostos fenólicos (Sampaio et al, 2011) e os terpenos (Selmar e Kleinwächter, 2013) aumentam em plantas sob condições de seca. Os carotenoides, conhecidos também como tetraterpenos, são oriundos dos terpenos e são responsáveis pela mitigação dos efeitos do estresse oxidativo.…”

Twenty Traditional Algerian Plants Used in Diabetes Therapy as Strong Inhibitors of α-Amylase Activity

“…We conclude that the plant source (the nature of the plant material, its origin, growth stage, climatic conditions for growth, degree of processing, moisture content, and particle size) [34] remains the first point influencing the synthesis of inhibitory molecules and their action which are influenced by the atmospheric and climatic conditions under which the plant is grown. The phenolic compounds and other secondary metabolites (responsible for the pharmacological effects of the plant) represent a chemical interface between the plants and the environment, and their synthesis is often affected by environmental factors [35]. Secondly, the successful determination of biologically active compounds from plant material is largely dependent on the type of solvent used in the extraction procedure.…”

Quantificação de fenóis totais presentes nas cascas de Trichillia catigua A. Juss (Meliaceae)

“…Os limites de detecção (0,0006 mg mL Na literatura científica há descrição desse mesmo método espectrofotométrico para quantificar polifenóis em plantas medicinais (Sampaio et al, 2011;Borges et al, 2012;Alcântara et al, 2012) e outro estudo descreveu método semelhante (Brighenti et al, 2007), entretanto a validação analítica não foi demonstrada. Além disso, encontrou-se um trabalho que emprega a cromatografia líquida de alta eficiência para a análise da catuaba (Beltrame et al, 2006), porém, embora seja esse um método analítico mais sensível e específico, é de custo mais elevado.…”