Overview
Quinine is a naturally occurring alkaloid derived from the bark of the cinchona tree, native to South America. It has been used for centuries as the primary treatment for malaria, though its use has declined with the development of synthetic alternatives. Quinine is also known for its bitter flavor, which makes it a key ingredient in tonic water. Historically, quinine played a crucial role in European colonization of tropical regions by protecting against malaria. Today, it remains on the World Health Organization's List of Essential Medicines and is used in cases where malaria is resistant to other treatments.
Physical and Chemical Properties
Quinine appears as a white, crystalline powder with a distinctly bitter taste. It is sparingly soluble in water but dissolves well in ethanol and chloroform. The compound fluoresces under ultraviolet light, a property sometimes used for identification. Chemically, quinine belongs to the class of cinchona alkaloids and features a quinoline moiety. Its molecular structure includes both basic and acidic functional groups, allowing it to form salts with acids or bases. The molecule is chiral, with the naturally occurring form being the (8α,9R)-stereoisomer.
Main Applications
The primary medical use of quinine is in the treatment of uncomplicated malaria caused by Plasmodium falciparum, particularly in cases resistant to chloroquine. It is typically administered orally or intravenously in hospital settings. Beyond medicine, quinine is widely used in the beverage industry as the bitter flavoring agent in tonic water. The standard concentration in tonic water is approximately 83 ppm. Some traditional medicines also employ quinine for its muscle relaxant properties, particularly for nocturnal leg cramps, though this use is controversial due to potential side effects.
Safety and Storage
Quinine must be handled with care due to its narrow therapeutic index. Overdose can lead to cinchonism, characterized by tinnitus, headache, nausea, and visual disturbances. Severe cases may cause cardiac arrhythmias or blindness. For storage, quinine should be kept in tightly sealed containers protected from light and moisture. The compound is relatively stable under normal conditions but may degrade when exposed to strong acids or bases. Proper labeling is essential to prevent accidental ingestion, particularly in facilities handling multiple pharmaceuticals.
B2B Procurement Guide
When sourcing quinine for commercial use, buyers should prioritize suppliers who can provide certificates of analysis verifying purity (typically 98-99.5% for pharmaceutical grade). The material should meet pharmacopeia standards (USP or BP) if intended for medical applications. For beverage applications, food-grade quinine hydrochloride or sulfate is commonly used. Buyers should confirm compliance with local food additive regulations. Lead times can vary significantly as quinine production depends on cinchona bark availability, so establishing long-term supplier relationships is advisable.
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