Bathochromic and stabilising effects of sugar beet pectin and an isolated pectic fraction on anthocyanins exhibiting pyrogallol and catechol moieties

► Sugar beet pectin and an isolated pectic fraction produce bathochromic shifts of anthocyanins. ► Colour evolution and stability depend on the number of hydroxyl groups in the flavylium B-ring. ► Maximum colour intensity and stability of Dpd-3-glc in pectic solutions with calcium acetate buffer. ► Decomposition of anthocyanin-metal chelates follows first order kinetics. ► AUCs of normalised absorption spectra allow to deduce colour characteristics and stability.