We studied the interaction between flavonoids andβ-lactoglobulin for the first time by HPLC-ESIQ-TOF-MS,and measured the binding constants ofβ-lactoglobulin with three flavonoids(morin,quercetin,and myricetrin)at different volume ratios by a direct calculation method.The results indicate that morin,quercetin,and myricetrin can form stable complexes withβ-lactoglobulin at different volume ratios.The binding numbers increase with the decreasing of volume ratios(i.e.increasing of flavonoids),and the binding co...