Fluorescent Properties of Hymecromone and Fluorimetric Analysis of Hymecromone in Compound Dantong Capsule

Table 1

Determination of ionization constant of 4MU.

pH	F	lg[(𝐹HB−𝐹)/(𝐹−𝐹B)]^∗	p𝐾𝑎	Average p𝐾𝑎
7.52	1601	−0.30	7.82	7.85 ± 0.03
7.77	2195	−0.07	7.84
7.98	2672	0.11	7.87
8.12	3074	0.26	7.86
8.28	3427	0.41	7.87

^∗𝐹_HB=21.18, 𝐹_B=4753.