Microcrystalline cellulose (MCC) is a widely used excipient in pharmaceutical formulations, serving as a binder, disintegrant, and filler in tablets and capsules [1]. Its inert nature and desirable physical properties make it a popular choice for drug manufacturers [2].
What exactly is microcrystalline cellulose?
Microcrystalline cellulose is a purified, partially depolymerized cellulose. It is produced from high-purity cellulose derived from wood pulp or cotton linters [3]. This process yields an insoluble, white to off-white crystalline powder that is odorless and tasteless [1][3]. The unique crystalline structure of MCC provides its high compressibility and binding capabilities, essential for tablet manufacturing [2].
How does microcrystalline cellulose work in tablets?
In tablet formulations, MCC functions primarily as a binder, holding the active pharmaceutical ingredient (API) and other excipients together to form a cohesive mass [1][2]. It also acts as a disintegrant, helping the tablet break apart in the gastrointestinal tract to release the API for absorption [1]. Its low moisture content and chemical inertness contribute to the stability of the final drug product [3].
What other uses does microcrystalline cellulose have in pharmaceuticals?
Beyond its role in solid dosage forms, MCC is also used as a diluent in capsule formulations and as a suspending agent in liquid suspensions [1]. Its ability to improve flow properties of powders makes it valuable in various manufacturing processes [2].
Are there different grades of microcrystalline cellulose?
Yes, MCC is available in various grades, differing in particle size, density, and moisture content [3]. These variations allow formulators to select the most appropriate grade for specific drug products and manufacturing methods, influencing tablet hardness, disintegration time, and dissolution rates [2].
What are the alternatives to microcrystalline cellulose?
Other common excipients can serve similar functions as MCC. Binders like povidone and starch paste are often used. Disintegrants such as croscarmellose sodium and sodium starch glycolate are also available [4]. Fillers like lactose and dicalcium phosphate can be used as alternatives where appropriate [4]. The choice of alternative often depends on the specific API properties and desired tablet characteristics.