Overview
Limonin is a naturally occurring triterpenoid compound primarily found in citrus fruits such as oranges, lemons, and grapefruits. It is responsible for the bitter taste in these fruits, especially in seeds and peels. As a secondary metabolite, limonin has garnered attention for its potential health benefits and industrial applications. In recent years, limonin has been studied for its antioxidant, anti-inflammatory, and anticancer properties, making it a valuable compound in the pharmaceutical and nutraceutical industries. Its bitter taste also finds use in the food industry as a natural flavoring agent.
Physical and Chemical Properties
Limonin is a white to off-white crystalline powder with a molecular weight of 470.52 g/mol. It has a melting point range of 298-302°C and is soluble in organic solvents like ethanol and methanol, but only slightly soluble in water. The compound is stable under normal storage conditions but may degrade when exposed to prolonged heat or light. One of the key characteristics of limonin is its intensely bitter taste, which is detectable even at very low concentrations. This property is leveraged in food science for bitterness masking and flavor enhancement. Chemically, limonin belongs to the class of limonoids, which are known for their diverse biological activities.
Main Applications
The primary use of limonin is in the food industry as a natural bittering agent and flavor modifier. It's commonly added to beverages, confectionery, and dietary supplements to enhance taste profiles or counteract excessive sweetness. In Japan, limonin-rich extracts are used in traditional bitter tonics. In the pharmaceutical sector, limonin is being researched for its potential therapeutic effects, including cholesterol-lowering, anti-tumor, and hepatoprotective properties. Some studies suggest it may help in managing metabolic disorders. Additionally, it's used in cosmetic formulations for its antioxidant benefits.
Safety and Storage
Limonin is generally considered safe for consumption in the quantities typically found in food products. However, concentrated forms may cause mild gastrointestinal discomfort or irritation. Appropriate personal protective equipment (gloves, goggles) is recommended when handling the pure compound in industrial settings. For storage, limonin should be kept in tightly sealed containers in a cool (below 25°C), dry environment away from direct sunlight. The compound is relatively stable but may degrade over time if exposed to moisture or extreme temperatures. Shelf life is typically 2-3 years when stored properly.
B2B Procurement Guide
When sourcing limonin for commercial use, buyers should prioritize suppliers who provide comprehensive product specifications, including purity levels (typically 95-98% for most applications) and solvent residues analysis. Pharmaceutical-grade limonin requires additional documentation like Certificate of Analysis (CoA) and GMP compliance certificates. Consider the extraction method used - cold-pressed or solvent-extracted - as this affects both price and suitability for different applications. For large-scale purchases, request samples for quality verification before committing to bulk orders. Pricing varies significantly based on purity, with food-grade being more economical than pharmaceutical-grade options.
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