Citric acid monohydrate and Anhydrous

What is Citric Acid?

Citric acid is a weak organic acid naturally found in citrus fruits such as lemons, limes, and oranges. It is widely used as an acidulant, flavoring agent, preservative, and chelating agent in various industries, including food and beverage, pharmaceuticals, cosmetics, and detergents.

Types and Grades of Citric Acid

The two primary commercial forms of citric acid are:

• Citric Acid Monohydrate: Contains one molecule of water per molecule of citric acid. It is the most common form used in food and other applications due to its ease of handling and stability.
• Citric Acid Anhydrous: The water-free form of citric acid, often preferred in applications requiring rapid dissolution or when moisture content must be minimized.

Citric acid is available in multiple grades such as Food Grade, Pharmaceutical Grade, and Industrial Grade, each adhering to specific purity and quality standards suitable for its application.

Typical Characteristics

• Chemical Formula: C₆H₈O₇ (monohydrate form includes one H₂O)
• Appearance: White crystalline powder or granules
• Solubility: Highly soluble in water
• pH: Acidic when dissolved in water (approximately 2.2 in 0.1 M solution)
• Melting Point: Around 153 °C (for monohydrate, it melts with decomposition)

Common Applications of Citric Acid

Citric acid plays a versatile role across a broad range of industries:

• Food & Beverage: Used as a flavor enhancer, acidulant to add tartness, preservative to inhibit microbial growth, and as an antioxidant synergist.
• Pharmaceuticals: Acts as an excipient for effervescent tablets and to adjust pH in formulations.
• Cosmetics & Personal Care: Balances pH, acts as a chelating agent to improve product stability, and enhances skin exfoliation.
• Cleaning Products: Widely used in detergents and descalers to dissolve mineral deposits and as an environmentally friendly alternative to harsher acids.
• Industrial Uses: Used in metal cleaning, water treatment, and as a chelating agent in various manufacturing processes.

Production and Quality Standards

Commercial citric acid is primarily produced via fermentation using strains of Aspergillus niger fungi cultured in sugar-rich substrates. After fermentation, the product is purified through crystallization processes to yield either monohydrate or anhydrous forms.

Quality standards for citric acid include compliance with criteria set by organizations such as the Food Chemicals Codex (FCC), United States Pharmacopeia (USP), and other regional regulatory bodies to ensure purity, safety, and suitability for intended uses.

Packaging and Trade Information

Citric acid monohydrate and anhydrous are commonly packaged in moisture-resistant bags or drums to preserve product integrity during transit and storage. Typical packaging sizes range from 25 kg bags for industrial and food-grade products to bulk bags for large-scale consumers.

Exports generally comply with international shipping and hazardous material handling standards, though citric acid is non-hazardous and widely accepted in global markets due to its natural origin and versatile utility.