Overview
4-Hydroxybenzoic acid (PHBA) is a monohydroxybenzoic acid derivative, naturally occurring in some plants and fruits. It serves as a key intermediate in synthesizing parabens, which are widely used as preservatives. Industrially, it is produced via the Kolbe-Schmitt reaction from phenol and carbon dioxide. The compound's antimicrobial properties make it valuable in extending shelf life in food and personal care products. Its derivatives, such as methylparaben and propylparaben, are more commonly used due to enhanced solubility.
Physical and Chemical Properties
PHBA appears as a white crystalline solid with a mild phenolic odor. It exhibits moderate solubility in polar organic solvents like ethanol but limited solubility in water (approximately 5 g/L at 25°C). The compound is stable under ambient conditions but may degrade under prolonged exposure to UV light or high temperatures. Its acidity (pKa ~4.5) allows it to form salts with bases, improving water solubility for certain applications. The melting point range of 214–217°C reflects its crystalline purity, a critical parameter for industrial use.
Main Applications
In the food industry, PHBA derivatives inhibit mold and yeast growth in baked goods and beverages. Cosmetic formulations utilize parabens derived from PHBA to prevent microbial contamination in creams, shampoos, and lotions. Pharmaceutical applications include its use as an intermediate for antibiotics and anti-inflammatory drugs. Recent research explores its potential in biodegradable polymers and advanced material synthesis.
Safety and Storage
While PHBA has low acute toxicity, prolonged skin contact may cause irritation. Proper storage requires airtight containers in cool (below 25°C), dry environments to prevent clumping or decomposition. Facilities should avoid storing near strong oxidizers. Regulatory compliance varies by region: The EU and FDA approve certain derivatives (e.g., parabens) within concentration limits, while other countries may impose restrictions. Always consult SDS before handling.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering ≥99% purity for critical applications. Bulk purchases (100+ kg) typically reduce costs by 15–30%. Key certifications to verify include ISO 9001 and REACH compliance. For international shipments, ensure proper classification under HS code 2918.29.00. Sample testing for heavy metal content (Pb, As) is recommended, especially for food/pharma-grade material. Some manufacturers provide custom particle size milling upon request.
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