Overview
Monobenzone, also known as monobenzyl ether of hydroquinone, is a chemical compound primarily used as a depigmenting agent in dermatology. It works by selectively destroying melanocytes, the cells responsible for skin pigmentation. This property makes it valuable in treating conditions like vitiligo, where depigmentation of unaffected skin can create a more uniform appearance. Discovered in the mid-20th century, monobenzone has been used clinically since the 1950s. Despite its effectiveness, it requires careful medical supervision due to its potent and irreversible effects on pigmentation. The compound is typically formulated into creams or ointments for topical application.
Physical and Chemical Properties
Monobenzone presents as a white to off-white crystalline powder at room temperature. It has a molecular weight of 200.23 g/mol and melts at 116-118°C. The compound shows good solubility in organic solvents like ethanol and acetone but has limited solubility in water. Chemically, monobenzone is stable under normal storage conditions but may degrade when exposed to prolonged light or heat. Its depigmenting action comes from its ability to generate reactive quinones that interfere with melanin synthesis. The compound's stability in various formulations is an important consideration for pharmaceutical manufacturers.
Main Applications
The primary medical application of monobenzone is in the treatment of extensive vitiligo, particularly when more than 50% of the body surface is affected. In such cases, depigmenting the remaining pigmented skin can provide a more uniform appearance. The compound is used off-label in some cases of hyperpigmentation disorders. Outside clinical settings, monobenzone has been investigated for industrial applications involving pigment control. However, its use is strictly regulated due to potential side effects. In pharmaceutical formulations, it's typically combined with other excipients to improve skin penetration and stability.
Safety and Storage
Monobenzone requires careful handling due to its potent biological effects. Direct contact with skin should be avoided unless under medical supervision, as accidental exposure can lead to permanent depigmentation. Proper personal protective equipment including gloves and eye protection is recommended when handling the pure compound. Storage should be in tightly sealed containers, protected from light and moisture, at controlled room temperature. The compound should be kept away from oxidizing agents and strong acids. Pharmaceutical formulations containing monobenzone typically have a shelf life of 2-3 years when stored properly.
B2B Procurement Guide
When procuring monobenzone for pharmaceutical or research use, buyers should verify the supplier's compliance with current Good Manufacturing Practices (cGMP). The material should be accompanied by a detailed Certificate of Analysis including purity, impurity profile, and residual solvent data. Bulk purchases typically range from 1 kg to 25 kg, with prices varying based on quantity and purity specifications. Pharmaceutical-grade monobenzone (USP or EP standard) commands a premium over technical-grade material. Lead times can vary from 2-6 weeks depending on supplier stock and customization requirements.
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