Atividade antioxidante das folhas de espinheira-santa - Maytenus ilicifolia Mart. ex Reiss., secas em diferentes temperaturas

Abstract

RESUMO:Maytenus ilicifolia Mart. ex Reiss, a espinheira-santa verdadeira, é largamente utilizada para tratamento de gastrites e úlceras estomacais. O seu valor terapêutico é atribuído principalmente aos polifenóis (flavonóides e taninos) e triterpenos. Os polifenóis são bastante estudados e estão relacionados à atividade antioxidante exercida pela planta. Existem vários métodos para avaliar a atividade antioxidante, a qual pode ser medida a capacidade antioxidante total utilizando o método de formação do complexo fosfomolibdênio e a atividade antioxidante em relação à redução de um radical, utilizando-se o DPPH (2,2-difenil-1-picrilhidrazila). A atividade antioxidante das folhas de espinheira-santa seca em diferentes temperaturas foi avaliada, visando verificar a possível influência das temperaturas de secagens e seu poder antioxidante. Foram utilizadas cinco temperaturas (40, 50, 60, 70 e 80 ºC) e uma temperatura de secagem de rotina, de um produtor/beneficiador de plantas medicinais. As menores temperaturas apresentaram as maiores atividades antioxidantes. Unitermos:Maytenus ilicifolia, Celastraceae, temperatura de secagem, antioxidante, DPPH, fosfomolibdênio.ABSTRACT: "Antioxidant activity of "espinheira-santa" -Maytenus ilicifolia Mart. ex Reiss., leaves dried in different temperatures". Maytenus ilicifolia Mart. ex Reiss, the true "espinheirasanta" is widely used for treating gastritis and stomach ulcers. Its therapeutic values are due mainly polyphenols (flavonoids and tannins) and triterpens. Polyphenols are largely studied and they are related to the antioxidant activity of the plants. There are several methods for evaluating the antioxidant activity, which can measured the total antioxidant capacity through the formation of a phosphomolybdenum complex and the antioxidant activity related to the reduction of one radical, using the DPPH (2,2-diphenyl-1-picrylhydrazyl). The antioxidant activity of "espinheira-santa" dried leaves in different temperatures was measured in order to evaluated the possible influence of drying temperatures under its antioxidant power. Five temperatures used were (40, 50, 60, 70 and 80 ºC) and a drying routine of medicinal plants as well. Lower temperatures showed the highest antioxidant activities.

Thermal behavior, spectroscopic studies and free radical scavenging potential of some mefenamate trivalent lanthanides (Sm, Eu, Gd, Tb and Dy)

“…where Abs (sample) is the absorbance of the solution of synthesized compounds and DPPH, Abs (blank) is the absorbance of methanol, and Abs (control) is the absorbance of the solution of methanol and DPPH [19].…”

“…Some papers have demonstrated that the compounds exhibiting antioxidant activity could be used as anticancer drugs, or as antiaging and anti-inflammatory agents [13][14][15]. The DPPH method is used extensively to evaluate antioxidant activity, and it has presented reliable results [16][17][18][19].…”

Determination of metals in medicinal plants highly consumed in Brazil

“…Infusion: 1-2 g (1-2 tea spoons) in 150 mL (tea cup) (Brasil, 2010c) Use 1 cup tea, 3 or 4 times daily (Brasil, 2010c) Treatment of gastritis and stomach ulcers (Negri, Possamai, Nakashima, 2009). …”

Drying of Echinodorus macrophyllus and autoclaving and lyophilization of the fluid-extract: effects on the pharmacochemical composition

“…Thus, Radünz et al (2003) evaluating how several drying temperatures interfere in coumarin content of Mikania glomerata leaves, observed that samples dried at 50 ºC presented a minor change regarding the plant in natura. Leaves of Maytenus ilicifolia ("espinheira-santa"), grown under the sun, were dried by Negri (2007) in an incubator at temperatures of 40, 50, 60, 70 and 80 o C. When dosing polyphenols, it was concluded that drying temperatures influence total polyphenol and tannin contents, recommending lower temperatures for this process. Diniz et al (2007) assessed the drying effect on the amount of flavonoids and hypericin in vegetative parts of Hypericum perforatum L. (hypericum).…”