Napthoquinones

These are phenolic compounds distributed in Rubiaceae and Verbenaceae. Plumbagin (5-hydroxy-2- methyl-1, 4-napthoquinone) from Plumbago zeylanica is a typical example of napthoquinone (Fig. 5.185). Shikonin obtained from Lithospermum canascens has hepatoprotective activity. Napthoquinones from Boraginaceae has shown hormone like activity.

Juglone obtained from Junglans nigra has sedative activity (Fig. 5.186). Napthoquinones from Boraginaceae has shown hormone like activity. Lapachol is a typical example of napthoquinone (Fig. 5.187).

Fig. 5.185 Structure of Plumbagin. Fig. 5.186 Structure of Juglone.

Fig. 5.185 Structure of Plumbagin. Fig. 5.186 Structure of Juglone.

Fig. 5.187 Structure of Lapachol.

Fig. 5.187 Structure of Lapachol.

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