Citric acid is a fundamental ingredient across numerous industries, valued for its acidity, preservative qualities, and flavor-enhancing properties. Available primarily in two forms – Anhydrous Citric Acid and Citric Acid Monohydrate – choosing the correct one for a specific application can be crucial for optimal performance and cost-effectiveness. NINGBO INNO PHARMCHEM CO.,LTD., as a leading manufacturer and supplier, provides both forms and offers insights to help you make the best choice.

Both Anhydrous Citric Acid (CAS No. 77-92-9) and Citric Acid Monohydrate (CAS No. 5949-29-1) are derived from the same core molecule, 2-Hydroxy-1,2,3-propane-tricarboxylic acid. The primary distinction lies in their water content.

Anhydrous Citric Acid: The Pure Powerhouse

  • Composition: Anhydrous Citric Acid contains no molecules of water in its crystal structure. Its chemical formula is C6H8O7, and its molar mass is approximately 192.12 g/mol.
  • Properties: It typically appears as white crystalline powder or granules. Due to the absence of water, it is generally more concentrated by weight compared to the monohydrate form. This makes it advantageous in applications where precise control over water content is critical, such as in dry powder mixtures or certain pharmaceutical formulations.
  • Applications: Preferred in applications requiring high purity and minimal moisture, including some dry food mixes, pharmaceuticals where water content is strictly controlled, and industrial processes where water might interfere. Many manufacturers look to buy anhydrous citric acid for its concentrated nature.

Citric Acid Monohydrate: The Versatile Standard

  • Composition: Citric Acid Monohydrate has one molecule of water of hydration per molecule of citric acid. Its chemical formula is C6H8O7·H2O, with a molar mass of approximately 210.14 g/mol.
  • Properties: It also presents as white crystalline powder or granules but contains about 8-9% moisture by weight. It is highly soluble in water and widely available.
  • Applications: This is the most commonly used form globally, especially in the food and beverage industry for beverages, confectionery, jams, and jellies. It is also prevalent in pharmaceuticals and household products due to its excellent solubility and efficacy.

Choosing the Right Form:

The decision between anhydrous and monohydrate largely depends on the specific application requirements:

  • For moisture-sensitive applications or where maximum acid concentration per unit weight is needed: Anhydrous Citric Acid is often the preferred choice. Consider purchasing anhydrous citric acid if your formulation demands precise control over water content or if you need a more concentrated acid source.
  • For general-purpose use in beverages, confectionery, and common pharmaceutical formulations: Citric Acid Monohydrate is usually sufficient and often more cost-effective. Its ease of handling and solubility make it a versatile standard for many manufacturers.

NINGBO INNO PHARMCHEM CO.,LTD. is dedicated to supplying both forms of citric acid to meet diverse market needs. We offer competitive pricing for bulk purchases and provide detailed specifications to assist you in making an informed decision. Contact us today to discuss your needs and source the ideal citric acid for your applications. As your trusted chemical supplier, we are here to help you find the perfect solution.