The effect of flow rate (1.7–10.2 BV/h; BV = bed volume) on
the adsorption of anthocyanins was investigated. Washing of
the loaded resin was done with purified water (3.4 BV/h) to
remove the non-adsorbed solutes from the adsorbent bed.
Desorption of anthocyanins from the loaded adsorbent
was performed using aqueous ethanol solutions. The effect of
ethanol concentration (25–75 vol.%) on desorption was investigated.
In addition, the effect of acetic acid addition (7 vol.%)
to the eluent was studied. The adsorbent used in desorption
experiments was loaded in a batch reactor in order to have
the same amount of anthocyanins in the adsorbent bed in
each desorption experiment. Washing of the loaded resin with
purified water was done prior to desorption.