Abstract
In this study, phycocyanin (PC) -quercetin (PC) complex (PC-QR) was prepared, and the effect of QR on the structure and storage stability of PC was evaluated. UV and fluorescence results showed that the weak interaction between PC and QR promoted the change of PC spatial conformation and tryptophan (Trp) microenvironment. Circular dichroism (CD) and Fourier transform infrared (FTIR) analysis showed that QR caused changes in the secondary structure of PC by partially unwinding the α-helix. From the zeta potential and particle size, the appropriate concentration of QR can promote PC polymerization. When the molar ratio of yellow QR to PC was 1:80, the binding of blue PC was induced to form a stable green PC-QR. The stability of the complex was better than that of PC after 7 days of storage under light conditions. This study proposes a new method to obtain natural colorants with better stability and wider color range by forming PC-QR. This method solves the problems of instability and limited color range of PC and QR as natural nutritional pigments, and expands their potential applications in food, cosmetics and pharmaceutical industries.
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