Overview
Shikonin is a bioactive naphthoquinone pigment extracted from the roots of Lithospermum erythrorhizon (commonly known as purple gromwell). It has been used for centuries in traditional Chinese medicine for its therapeutic properties. Modern research confirms its antimicrobial, anti-inflammatory, and antitumor effects, making it valuable in pharmaceuticals and cosmetics. Its vibrant reddish-purple color also lends itself to use as a natural dye in textiles and cosmetics. Due to its complex biosynthesis, commercial production often relies on plant extraction or cell culture techniques, impacting its market price and availability.
Physical and Chemical Properties
Shikonin appears as a reddish-purple crystalline powder with a melting point of 152-154°C. It is lipophilic, dissolving well in organic solvents like ethanol and dimethyl sulfoxide (DMSO) but exhibiting limited water solubility. The compound is sensitive to light and oxygen, requiring protective storage conditions. Its chemical structure includes a naphthoquinone core with hydroxyl and prenyl side chains, contributing to its redox activity and biological effects. Stability tests recommend storage under inert gas (e.g., argon) to prevent degradation.
Main Applications
In pharmaceuticals, Shikonin is studied for its potential in cancer therapy due to its ability to inhibit tumor cell proliferation and induce apoptosis. It also accelerates wound healing and combats infections, making it a candidate for topical formulations. The cosmetic industry values Shikonin as a natural alternative to synthetic dyes, particularly in lipsticks and skincare products targeting inflammation. Its traditional use in herbal medicine persists, often incorporated into ointments for burns and dermatitis.
Safety and Storage
Shikonin requires careful handling to avoid skin irritation or allergic reactions. Personal protective equipment (PPE) such as gloves and goggles is recommended during laboratory use. Inhalation of dust should be prevented. For long-term storage, keep the compound in airtight containers under inert gas at temperatures below 4°C. Degradation products can form upon exposure to light or moisture, reducing efficacy. Stability-indicating assays (e.g., HPLC) are advised for quality control.
B2B Procurement Guide
When sourcing Shikonin, prioritize suppliers who provide certificates of analysis (CoA) detailing purity (≥98% for research-grade, ≥95% for industrial use). Pharmaceutical applications demand GMP-compliant material, while cosmetic-grade may tolerate lower purity. Bulk purchases (kilograms) typically reduce costs, but confirm scalability with the supplier due to limited natural availability. Alternatives like synthetic derivatives or cell-cultured Shikonin may offer cost and consistency advantages for large-scale production.
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