Conjugated Linoleic Acid (CLA)
Overview
Conjugated Linoleic Acid (CLA) refers to a family of at least 28 isomers of linoleic acid with conjugated double bonds. Naturally occurring in ruminant animal products, CLA has gained attention for its potential health benefits in weight management, immune function, and metabolic health. The most studied isomers are cis-9, trans-11 and trans-10, cis-12 CLA. In industrial applications, CLA is typically produced through alkali isomerization of safflower or sunflower oil. The recovered form maintains similar properties to naturally occurring CLA but may vary in isomer distribution. Commercial CLA products are commonly used in functional foods and dietary supplements.
Physical and Chemical Properties
CLA appears as a pale yellow to colorless oily liquid at room temperature. As a polyunsaturated fatty acid, it exhibits typical lipid properties including insolubility in water but good solubility in organic solvents like ethanol or hexane. The conjugated double bond system makes CLA more stable than ordinary linoleic acid but still susceptible to oxidation. The specific physical properties vary slightly depending on the isomer ratio. Commercial CLA mixtures typically have a density around 0.9 g/cm³ and remain liquid at room temperature. The conjugated structure gives CLA unique chemical reactivity, including potential antioxidant properties and specific interactions with cellular receptors involved in lipid metabolism.
Main Applications
The primary application of recovered CLA is in the nutraceutical industry, where it's formulated into softgel capsules, powder blends, and functional foods targeting weight management and metabolic health. Typical dosage ranges from 1.5-6g daily in supplements. Food manufacturers incorporate CLA into dairy products, nutrition bars, and beverages to enhance their functional properties. In animal nutrition, CLA is added to feed to potentially improve body composition in livestock. Some cosmetic formulations include CLA for its potential skin health benefits. Industrial applications are limited but include use as a specialty chemical intermediate in certain synthesis processes.
Safety and Storage
CLA is generally considered safe for consumption at recommended doses, with GRAS (Generally Recognized As Safe) status in many countries. Potential side effects at high doses may include digestive discomfort. Proper storage is crucial to maintain product quality due to oxidation sensitivity. For bulk storage, CLA should be kept in sealed containers under nitrogen atmosphere at temperatures below 25°C (77°F). Exposure to light, heat, and oxygen should be minimized. Small quantities for laboratory use are typically stored refrigerated in amber glass bottles. Shelf life is typically 24 months when properly stored, with rancidity being the primary indicator of degradation.
B2B Procurement Guide
When sourcing recovered CLA, prioritize suppliers who provide detailed certificates of analysis including isomer profile (minimum 80% total CLA content), peroxide value (<5 meq/kg), and acid value specifications. Pharmaceutical-grade CLA (95%+ purity) commands premium pricing but may be necessary for certain applications. Consider minimum order quantities (typically 25kg drums for industrial buyers) and lead times, as production may be batch-based. Evaluate supplier capabilities for custom isomer ratios or encapsulation services if needed. For international shipments, verify proper packaging (nitrogen-flushed drums) and cold chain logistics if required. Price negotiations often depend on volume commitments and payment terms.
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