based on specific individual interactions between the substances and the two phases. It is no longer possible to correlate Rf with overall polarity of the analyte. For anthocyanins, the ability of glycosidic side chains to interact with the cellulose fibers may play an important role, so the position at which the glycoside is linked to the dye can affect the availability of the glycoside for interactions with the cellulose and lead to separation of closely related anthocyanins. Anthocyanidins do not have glycosidic side chains so they will interact with the cellulose differently than anthocyanins do. For these compounds, Hbonding interactions may play an important role. In general, a hydroxy substituent will lead to decreased mobility (lower Rf) compared to a methoxy substituent or H within a series of related anthocyanidins