Absorption spectra provide the necessary information on the absorption transition between the dye ground state, excited state, and the solar energy range absorbed by the dye. Generally, anthocyanins and their derivates show a broad absorption band in the range of visible light attributed to charge transfer transitions from highest occupied molecular orbital (HOMO) to lowest unoccupied molecular orbital (LUMO) [4]. Recent investigations indicated that
anthocyanins are responsible for the attractive colors of the fruits with absorption maxima around 520 nm [21]. Anthocyanin is the core composition of some natural dye and it is often found in fruits, flowers and leaves of plants. The most common anthocyanidins found in flowers are pelagonidin (orange), cyanidin (orange–red), delpinidin (blue–red), petunidin (blue–red), and malvidin (blue–red) [22].