Method for detecting Tadalafei and derivative thereof

The invention discloses a method to detect Tadalafil and its derivative: (1) Color reaction. Make color reaction by adding vitriol solution of sodium molybdate. (2) Result estimation. If color reaction presents blue violet, there are Tadalafil and its derivative in test samples. The method adopts special Flood reaction of Tadalafil is for testing, which has merits of quick, simple, high sensitivity and strong property etc.