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• W2036305341 startingPage "3269" @default.
• W2036305341 abstract "The release profiles of model drugs (propranolol HCl, diclofenac sodium, salicylic acid and sulfasalazine) from low molecular weight poly(d,l-lactic acid) [d,l-PLA] tablets immersed in buffer solutions were investigated in an attempt to explore the mechanism of the related phenomena. It was confirmed that drug release is controlled by diffusion through the polymer matrix and by the erosion of the polymer. The pH of the surrounding medium influences the drug solubility as well as swelling and degradation rate of the polymer and therefore the overall drug release process. Physicochemical interaction between d,l-PLA and drug is an additional factor which influences the degree of matrix swelling and therefore its porosity and diffusion release process. Propranolol HCl shows extended delivery time at both examined pH values (5.4 and 7.4) and especially at pH 7.4 where release was accomplished in 190 days, most probably due to its decreased solubility at higher pH values. The acidic drugs gave shorter delivery times especially at pH 7.4. A slower drug release rate and more extended delivery time at pH 7.4 in comparison with that at pH 5.4 was recorded for tablets loaded with diclofenac sodium and salicylic acid. The opposite effect was observed with samples loaded with propranolol HCl." @default.
• W2036305341 created "2016-06-24" @default.
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• W2036305341 date "2006-12-01" @default.
• W2036305341 modified "2023-10-14" @default.
• W2036305341 title "The role of polymer/drug interactions on the sustained release from poly(dl-lactic acid) tablets" @default.
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• W2036305341 doi "https://doi.org/10.1016/j.eurpolymj.2006.08.023" @default.
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