Electric field-controlled benzoic acid and sulphanilamide delivery from poly(vinyl alcohol) hydrogel.
The controlled release of benzoic acid (3.31 Å) and sulphanilamide (3.47 Å) from poly(vinyl alcohol), PVA, hydrogels fabricated by solution casting at various cross-linking ratios, were investigated. The PVA hydrogels were characterized in terms of the degree of swelling, the molecular weight between cross-links, and the mesh size. The drug release experiment was carried out using a modified Franz diffusion cell, at a pH value of 5.5 and at temperature of 37°C. The amount of drug release and the diffusion coefficients of the drugs from the PVA hydrogels increased with decreasing cross-linking ratio, as a larger mesh size was obtained with lower cross-linking ratios. With the application of an electric field, the amount of drug release and the diffusion coefficient increased monotonically with increasing electric field strength, since the resultant electrostatic force drove the ionic drugs from the PVA matrix. The drug size, matrix pore size, electrode polarity, and applied electric field were shown to be influential controlling factors for the drug release rate.
Conductive and Electroactive Polymers Research Unit, The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok, 10330, Thailand.
Jarinya
J
Sittiwong
Sumonman
S
Niamlang
Nophawan
N
Paradee
Anuvat
A
Sirivat
D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000737:chemistry; D019817:Benzoic Acid / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry; D003692:Delayed-Action Preparations / Q000737:chemistry; D004058:Diffusion; D016503:Drug Delivery Systems / Q000379:methods; D004560:Electricity; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010316:Particle Size; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D000077145:Sulfanilamide; D013424:Sulfanilamides / Q000008:administration & dosage* / Q000737:chemistry*; D013696:Temperature
D000900:Anti-Bacterial Agents; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D012996:Solutions; D013424:Sulfanilamides; D000077145:Sulfanilamide; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D019817:Benzoic Acid; D011142:Polyvinyl Alcohol