Influência dos fatores ambientais sobre a concentração de compostos fenólicos nas folhas e na casca do caule de Lafoensia pacari A. St.-Hil. (Lythraceae)

• Main Author: SAMPAIO, Bruno Leite
• Publication Date: 2010
• Format: Master thesis
• Language: por
• Source: Repositório Institucional da UFG
• Download full: http://repositorio.bc.ufg.br/tede/handle/tde/2096
• topic: Taninos; Flavonóides; Ácido elágico; Nutrientes minerais; Sazonalidade; Tannins; Flavonoids; Ellagic acid; Mineral nutrients; Seasonality; CNPQ::CIENCIAS DA SAUDE::FARMACIA

In Brazil, the cerrado is holding out for 20 to 50% of plant species in the country, contributing to research on natural products. Among the medicinal plants of the cerrado, Lafoensia pacari A. St.-Hil., known as dedaleiro or pacari is widely used as an antipyretic, healing, antiinflammatory, antidiarrheal, in gastritis and cancer. Studies have shown that extracts of L. pacari has antioxidant, anti-inflammatory, analgesic, antimicrobial and antidyspeptic activities. Among the groups of metabolites identified in L. pacari, stand out polyphenols, such as tannins and flavonoids, related to the its pharmacological activities. Due to the pharmacological importance of L. pacari, there is need for studies that may contribute to the standardization of plant parts as plant drug. Studies on the influence of environmental factors on production of the major groups of secondary metabolites of pacari are important because they contribute data to the cultivation and harvest, and to establish quantitative parameters of the plant drug metabolites. This study aimed to evaluate the influence of environmental factors like temperature, precipitation, mineral nutrients from soil and plant tissues on the concentration of secondary compounds in the leaves and bark of pacari. By spectrophotometric methods were determined levels of total phenols, tannins by protein precipitation, hydrolysable tannins, total flavonoids and ellagic acid in leaves and stem bark of L. pacari, as well as levels of nutrients in these tissues during the period of one year in five localities, with collections quarterly. Analysis was performed for the soil fertility of each collection site was the second standard procedure by EMBRAPA. The data were analyzed using Canonical Redundancy Analysis and Hierarchical Cluster Analysis. The results, after statistical analysis, showed that the leaves of L. pacari there is a influence of seasonality, with the temperature and leaf micronutrients (Cu, Fe, Mn, Zn) being the main factors of influence by environment and for the stem bark of L. pacari the location (region) where the specimen is collected is the main factor of variation in phenolic compounds, with soil fertility exerting greater influence on the stem bark. This study showed that for L. pacari climatic factors, nutritional status of plant tissue and soil conditions, exert influence on the phenolic compounds found in plant tissues analyzed from this plant.