Yupin Mitpracha. Effect of plasticizers on physicochemical properties of alginate film containing model drug. Master's Degree(Pharmaceutics ). Mahidol University. : Mahidol University, 2008.
Effect of plasticizers on physicochemical properties of alginate film containing model drug
Abstract:
Film of sodium alginate was obtained by addition of internal crosslinking agent, calcium chloride, and using casting method. Diclofenac sodium and acetaminophen were used as model drugs due to the difference in ionization property. Plasticizing effect of glycerin, PEG400 or PG over the range of 2.5-30% w/w physicochemical properties of alginate film with or without model drug were evaluated. The mechanical properties, water vapor transmission, moisture content, drug content and drug release were evaluated. It was found that all formulations were easy to cast and dry. The thickness of alginate films were 4-7 μm and 14-24 μm for alginate film without and with model drug, respectively. Immediate release pattern of the films were shown (i.e., more than 80% of the drug was released from almost all of the formulations within 5 minutes). Acetaminophen alginate film with 30% glycerin showed a decrease in tensile strength, increase in elongation of the film and the lowest of water vapor transmission rate. The films containing the lowest concentration of PEG400 and PG showed the low moisture content after storage in 75%RH and 100%RH for 20 days. It was shown 2.5% glycerin and 12.5% PG were suitable for plasticizers diclofenac alginate film. Diclofenac alginate film with 2.5% glycerin showed the lowest water vapor transmission rate. Additionally, it was found that the higher concentrations of glycerin or PG, the higher drug release for diclofenac alginate film. However, it was shown that none of the plasticizers used was suitable for alginate film containing acetaminophen.