Scharbert, Holzmann, and Hofmann (2004) found that rutin induces a
“silky, mouth-drying, and mouth-coating sensation”, and that the oral
threshold for this compound is extraordinarily low at 0.001 mg/L compared
to the 3-O-glucoside (0.65 mg/L) and -galactoside (0.43 mg/L)
derivatives of quercetin.