Processing tomato waste as a potential bioactive compounds source: phenolic compounds, antioxidant capacity and bioacessibility studies

Resíduo do processamento do tomate como potencial fonte de compostos bioativos: compostos fenólicos, capacidade antioxidante e bioacessibilidade

ABSTRACT:

A comparative study was perfomed with conventional and ultrasound assisted extraction on tomato processing waste. Ultrasound extraction exhibited slightly higher phenolic and flavonoids content, as well as higher ABTS ⁺ radical scavenging capacity (4.63 mg GAE.g^-1, 0.96 mg RUE.g^-1 and 27.90 μmol TE.g ^-1 respectively). On both extracts, a high percentage of flavonoids was lost during simulated digestion, resulting on a bioacessibility of approximately 13 %. Extracts presented good stability during storage conditions, which indicates a possible technological application.

Key words:
tomato; bioactive compounds; ultrasound-assisted extraction; conventional extraction; bioaccessibility