Naphthoquinones

Naphthaquinones are dark yellow pigments with a range of pharmacological properties. Some have antimicrobial and anti-fungal properties. Examples include:

• Juglone from Julgans nigra/cineraria (Black Walnut) which is both a laxative and a vermifuge
• Plumbagin from Drosera rotundifolia is cytotoxic at high does and immunostimulating in lower doses
• Lapachol from Tabebuia sp (Pau D’arco)