Page 36 - final Practical handout PG 303-Cogno-2- 2024-2025
P. 36

Clinical Pharm D                           Level 2                       Pharmacognosy-2 (PG 303)

Chemical test       Test for Menthol:             Test for thymol:       Vitali's test for solanaceous
                                                                                   alkaloids:
               Peppermint oil (3 drops) +     Thyme oil (3 drops) +
                    glacial acetic acid    glacial acetic acid (3 ml) +      KOH → violet color
                                           H2SO4 (6 drops) + HNO3 (1
               containing 0.3% HNO3 (5
                    mL), heat 5 min.                    drop)

               blue fades to golden yellow. deep bluish green color.

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