Overview
Cinnamic acid is an unsaturated carboxylic acid derived from cinnamon oil or synthesized chemically. It exists in trans- and cis- forms, with the trans-isomer being more stable and commercially prevalent. The compound is valued for its sweet, balsamic aroma and functional properties in multiple industries. Historically isolated from cinnamon bark, modern production primarily uses the Perkin reaction between benzaldehyde and acetic anhydride. Food-grade cinnamic acid (E210 in EU) is strictly regulated for purity to ensure safety in consumable applications.
Physical and Chemical Properties
As a crystalline solid, cinnamic acid exhibits low water solubility but dissolves readily in organic solvents like ethanol. Its conjugated double bond system contributes to UV absorption at 278 nm, making it useful in sunscreen formulations. The acid undergoes reactions typical of carboxylic acids (e.g., esterification) and alkenes (e.g., hydrogenation). Thermal stability is moderate, with decomposition occurring around 300°C. The compound shows antimicrobial activity against bacteria and fungi, which underpins its use as a natural preservative. Its pKa of 4.44 indicates weaker acidity compared to simple aliphatic carboxylic acids.
Main Applications
In the food industry, cinnamic acid serves as a preservative in baked goods, beverages, and dairy products, extending shelf life by inhibiting mold growth. Its derivatives (e.g., methyl cinnamate) are common flavoring agents with fruity notes. Pharmaceutical applications include synthesis of anticoagulants, antidiabetic drugs, and cinnarizine for motion sickness. The cosmetics sector utilizes its UV-absorbing properties in sunscreens and its fragrance in perfumes. Industrial uses encompass liquid crystal displays (LCDs) and photoinitiators for polymer curing. Recent research explores its potential in organic electronics and as a precursor for biodegradable plastics.
Safety and Storage
Cinnamic acid is generally recognized as safe (GRAS) for food use at regulated levels but may cause mild irritation upon direct contact. Proper storage requires airtight containers in environments below 25°C with <60% humidity to prevent caking or degradation. Facilities should avoid storing near strong oxidizers. Workers handling powdered forms should use NIOSH-approved dust masks and goggles. Spills should be contained with inert absorbents and disposed following local regulations. Safety Data Sheets (SDS) must be reviewed for region-specific handling protocols, particularly regarding ventilation requirements in industrial settings.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and batch-specific Certificates of Analysis (CoA) confirming ≥99% purity. Key evaluation criteria include: residual solvent levels (e.g., acetic acid <0.5%), heavy metal content (<10 ppm lead), and microbiological limits for food-grade material. Bulk purchases (500kg+) typically offer 10-15% cost savings. Packaging options include fiber drums with polyethylene liners or customized sizes for automated production lines. Just-in-time delivery agreements help minimize storage costs. Emerging markets like India and China are increasing production capacity, potentially affecting global pricing trends.
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