Polymers Employed in the Manufacture of Matrix Systems

There are a wide range of excipients which can be used in forming matrix systems, and among them, polymers constitute the largest group. The following are the most frequently used in inert and hydrophilic matrices (Table 4.1). 

Ethylcellulose Polymethacrylates Polyvinyl acetate Cellulose ethers (HPMC, MC, CMC) Chitosan Gums (Xanthan gum. Guar gum) Polyethyleneoxide Polyurethanes Sodium alginate Starch derivatives 

---

In-depth knowledge of properties of the polymers employed in the manufacture of matrix systems is always necessary due to the high impact they have on their behavior. The polymer properties showing more influence on the drug release are considered in this section. 

---