Table 2: Comparison of sensitivity of some spectrophotometric methods for the determination of dopamine.

MethodMolar absorptivity (L·mol−1·cm−1)Reference

Reaction with 1,2-naphthoquinone-4-sulfonate2.78 × 103[14]
Diazotised with sulphamic acid4.2 × 103 [16]
Isoniazid in the presence of -bromosuccinimide6.47 × 103 [15]
Thiosemicarbazide2.4 × 104 [20]
Potassium ferricyanide-Fe(III) 3.2 × 104 [19]
Diazotised sulphanilamide in the presence of molybdate5.39 × 104[17]
Proposed method (solid phase spectrophotometry)1.78 × 105This work