Correlation of polyphenol content and antioxidant capacity of selected teas and tisanes from Brazilian market

Abstract

In this work, it was evaluated the phenolic content, redox behavior and antioxidant capacity of several selected teas and tisanes from Brazilian market. The samples were classified as simple (single herb) or composed (blend of two or more herbs). In addition, complementary multivariate statistical approaches were used to identify the correlation and interdependence between the amount of major phytocomponents, such as phenols and flavonoids, as well as the antioxidant activity of the products. Results showed that the total polyphenol and total flavonoid concentrations are correlated to thermodynamic feasibility of reactive oxygen species reduction. The statistical modeling differentiated the results datasets in principal components, whose flavonoid content presented itself as the main parameter to segregate data between simple and composed products. On the other hand, the whole polyphenol content, in both teas and tisanes, was more relevant regarding their antioxidant capacity than the flavonoids content. Considering that the manufactures do not display the real amount of each herb in the labels of the composed products, it was not possible to confirm whether the blends of several species lead to a substantial enhancement on their antioxidant capacity. Furthermore, the redox profile and overall polyphenol content suggest that the consumption of green and black teas as well as traditional yerba mate may be worthwhile in preventing ailments associated with oxidative stress in Brazilian population. Notwithstanding, further clinical studies are required to validate this hypothesis.

Exploring Cheminformatic Toolsets for Predicting the Dermal Toxicity of Furanocoumarins

“…In this sense, some reports supported this interpretation due to the increased formation of reactive oxygen species in the presence of LF and similar compounds [19,32,[44][45][46]. Notwithstanding, the furan ring of LF also features thermodynamic feasibility to covalently bind to several biologic receptors, which could explain both the therapeutic and toxic effects of these chemicals [9,10,47,48].…”

“…These compounds are biosynthesized from intermediaries of polyketide and mevalonate pathways, and their chemical structures showcase high variability, being only ever-present the core-moiety furo [3, 2-g] chromen-7-one. Although psoralens may vary in sidechain composition and conformation, these compounds do exhibit similar physicochemical features due to the substantial electron donor and accepting properties of their central aromatic system, which not only provides them similar electroactivity to several aromatic natural and synthetic compounds [4][5][6][7][8][9][10] but also confers photoreactivity to them upon the incidence of radiation at ≈ 340-365 nm (i.e. near the end of the ultraviolet spectrum) [1].…”

Influence of organo-mineral supplementation on the production of secondary metabolites in in vitro-germinated Bromelia balansae Mez.

“…• phenols through three different methods (i.e. reaction with alkaline hydroxides; reaction with aluminum hydroxide; and use of iron chloride as chromogen) (Alves et al, 2020;Delgado et al, 2019);…”

“…Considering the variable chemical structure of plant secondary metabolites, it is widely understood that these compounds also showcase a plethora of different uses in medicine. For instance, the uptake of phenolic compounds such as flavonoids, tannins and anthocyanins has been reported to lead up to strong antioxidant and anti-inflammatory activity in animal models; showcasing therapeutic effects even in hard-to-reach tissues such as in the central nervous system (Alves et al, 2020;Oliveira et al, 2018;Thomaz et al, 2018a), while alkaloids have a lengthy historic use in occidental medicine to suppress pain and induce anesthesia (Neto et al, 2019;Zhu et al, 2020). In this sense, the myriad of therapeutic applications of plant secondary metabolites highlights the relevance of understanding the factors which might promote or hinder their expression during plant development.…”

Efeitos do ácido gálico na resposta vascular: interação com o Fator Hiperpolarizante Derivado do Endotélio (EDHF)

“…Nesse contexto, plantas medicinais são conhecidas por possuírem um gama de propriedades farmacológicas, devido a seus compostos, por exemplo, os polifenólicos, alguns estudos abordam esses compostos como fonte terapêutica alternativa (ALVES et al, 2020).…”