Raphanus sativus functional potential: Impact of the analytical extraction technique on the bioaccessibility interpretation

Abstract

Radishes (Raphanus sativus L.) are cruciferous vegetables with remarkable nutraceutical properties given their distinctive isothiocyanates (ITCs) profile. These compounds are formed after glucosinolates-Myrosinase enzymolysis. Although it is important to characterize radishes´ ITCs levels, it is also necessary to evaluate the bioactive compounds´ physiological fate after radishes ingestion. To do so, the extraction techniques should adapt to such conditions of high aqueous environment. In this work, we studied the bioaccessibility of ITCs and indole-3-carbinol (I3C) in radishes taproots considering the analytical implications of this biological process. Results showed that ITCs and indole profiles in the radish´s taproots after aqueous-myrosinase hydrolysis followed by Dispersive Liquid-Liquid Microextraction were distinctively different from other reports. After in vitro digestion, raphasatin showed the highest bioaccessibility despite its low quantitative yields. Notably, I3C and S-Sulforaphene become promising phytochemicals, due to their bioaccessibility and their considerable remaining amounts after digestion.