“…Significant differences in tryptophan fluorescence intensities may also be related to the content of flavonoids in these products. Among them, such compounds as quercetin, myricetin, kaempferol, luteolin, rutin, naringenin, naringin, chrysin, rhamnetin, isorhamnetin, apigenin, pinocembrin, pinobanksin, galangin, tricetin, catechin, and hesperidin are the primary compounds found in various varieties of honey [ 31 ]. It is known that some of these compounds can quench Trp fluorescence by binding to proteins, especially enzymatic ones, acting as their inhibitors [ 32 ].…”