Fig. 1. Schematic diagram of discrimination of absorption peaks using AIP method

Fig. 2. Absorption coefficient spectrum of Furantoin and its corresponding first and second derivative function

Fig. 3. Result of absorption peak discrimination of nitrofurantoin using AIP

Fig. 4. Comparison of theoretical and experimental absorption spectrum of furantoin

Fig. 5. Absorption peak discrimination results of four kinds of samples using AIP
(a): Nitrofurantoin; (b): Furacilin; (c): Furaltadone; (d): Furazolidone