4. Conclusion
In this study, an automatic and quick on-line HPLC-FRSD system to detect the TAC of Citrus fruit extracts was established for the first time. The study combined high performance liquid chromatography (HPLC) system with post-column (free radical scavenger detector, FRSD) system and built a new on-line system (on-line HPLC-FRSD system) for quick analyzing antioxidant capacity containing on-line HPLC-DPPH-FRSD and HPLC-ABTS-FRSD methods. The running time for each sample was only 5 min. This on-line HPLC-FRSD system is a good alternative for analysis TACs of Citrus fruits and potentially for other plants and plant-based products.