Staining of Parasitic Helminths by Extracts of Allium cepa Juglans regia and Rubia tinctorum: An Approach to Herbal Dyes

摘要

Background:Although carmine, as a synthetic dye, is the major substance for staining helminths, it may impose some adverse effects on human health. In the present study, we evaluated the aqueous extracts of onion (Allium cepa) skin, walnut (Juglans regia) husk, and madder (Rubia tinctorum) roots as potential herbal dyes for staining parasitic helminths.