The colour and stability properties of jambolan anthocyanins, both natural and copigmented forms, were
investigated in beverage model as well as their radical scavenging ability. Natural anthocyanins of jambolan
revealed low colour intensity due to glycosylation structure of the anthocyanins as diglucoside. The
intermolecular copigmentation of anthocyanins with sinapic acid, caffeic acid, ferulic acid, and rosemary
polyphenolic extract could enhance the colour intensity, which was observed through spectrometric
parameters, such as hyperchromic effect (DAvis-max) and bathochromic shift (Dkvis-max). In addition of sinapic
acid, caffeic acid, and rosemary polyphenolics also increased the stability of the anthocyanin colour
during exposure to white fluorescent light and storage at refrigeration and room temperatures, whereas
on high thermal treatments, this phenomenon was not observed. Furthermore, beverage model coloured
with natural or copigmented anthocyanins revealed DPPH radical-scavenging activity. The AEAC values
indicated that the beverage models with copigmented anthocyanins had higher scavenging activity than
the beverage with natural anthocyanins.