The effect of acetic acid addition(7 vol.%) on the desorption of anthocyanins was investigatedwith 75 vol.% ethanol. Acetic acid increased the amount of des-orbed anthocyanins by over 40% (Fig. 7 and Table 2).This effectmost probably resulted from the dependence of the structureand stability of anthocyanins on pH. At the pH of the acidicethanol eluent (pH ∼ 3.1), the anthocyanin molecules aremainly in quinoidal base form (Moldovan et al., 2012).