Adsorption characteristics of modified bentonites for purification of anthocyanin from saffron tepal.

In this study, anthocyanin was extracted from saffron tepals utilizing the ultrasound-assisted extraction method. The adsorbents of raw bentonite (RB), acid activation of bentonite (AA) thermal activation of bentonite (TA), and acid and thermal activation of bentonite (ATA) were employed to separate anthocyanin from solution. The influence of the operating parameters was evaluated.