In addition, they found an increase in the percentage of
polymeric color, possibly due to the formation of polymers
originating from the condensation between anthocyanins and
other phenolic compounds, by way of the co-pigmentation
phenomenon (Castan˜eda-Ovando et al., 2009). Small unidentified
peaks were found by HPLC analyses after 6 months of storage, and
considered to be products of anthocyanin degradation (Chaovanalikit
and Wrolstad, 2004b). They were probably not computed in
the results presented for total anthocyanins as analyzed by
spectrophotometry, and for this reason, the losses appeared to be
more significant