Quantificação espectrofotométrica de flavonoides na casca da uva niágara rosada (Vitis labrusca L.)

Abstract

Various health problems are associated with inflammatory processes in the human body. Currently, anti-inflammatory medications are used to inhibit the progression of inflammation, yet they often come with undesirable side effects. Given this issue, phytochemical methods have been considered as alternatives due to the presence of anti-inflammatory substances in plants. Fruits, including grapes, possess relevant phytochemical properties. Grapes have been consumed for thousands of years, and recently, benefits related to consuming the fruit peel have been discovered. The peel and seeds of grapes contain flavonoids, phenolic acids, and resveratrol, which exhibit antioxidant activities. Therefore, the aim of this study was to determine the quantity of flavonoids present in the peel of Niagara Rosada grapes (Vitis labrusca L.). The study was conducted as an experimental research, employing spectrophotometric quantification in the UV/Visible spectrum range, with a wavelength of 420 nm, for the quantitative determination of flavonoids, using rutin as the reference standard. As a result, 78.5 mg of total flavonoids expressed in rutin were obtained per 100 grams of grape peel. This value was found to be similar to the studies by Abe et al (2007) and Castilhos (2011). These findings highlight the importance of consuming grape peel in its natural form due to the benefits of the present flavonoids, while also providing significant contributions for future research and practical applications related to the valorization of these bioactive compounds, both in the industry and in improving health.