放出制御及び生物学的利用能の向上を目指した製剤の開発に関する研究
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During the past fifteen years, the experiments based on three main propositions were proceeded to carry out in our laboratory, that is, (1) Microencapsulation : The method of solvent evaporation in water or oilly phases was adopted because of its comparative simplicity in the procedure and its high reproducibility. The application of pharmacokinetic consideration to in vivo evaluation of microencapsulated drugs using beagle dogs intended for obtaining controlled-release by oral administration. The pullunan acetate phthalate microcapsules containing cefadroxil were prepared by the solvent evaporation method in liquid paraffin and showed a zero-order dissolution pattern in pH 6-7.4. (2) Rectal gel preparation : The hydrogels and xerogels were prepared by Eudispert hv. These gets have excellent staying properties in the lower part of the rectum, over a fairly long period. Eudispert hv hydrogels or xerogels containing propentfylline were tested for avoidance of the first-pass metabolism. The absolute bioavailability of propentofylline from gel preparations was almost 100%. (3) Binary vehicle for transdermal delivery : The effects of glycerides, short-chain alcohols and their binary vehicles as donor components on the skin permeation of ketoprofen across the excised hairless mouse skin were evaluated with the diffusion cell. Among single vehicles, Panasate 800 as lipophilic vehicle and ethanol as hydrophilic vehicle showed the effective permeation flux of ketoprofen. The greatest enhancement was observed in an ethanol/Panasate 800 (40/60) binary vehicle. The relationship between lipophilicity and skin permeability of 16 drugs from the ethanol/Panasate 800 (40/60) binary vehicle showed a parabolic shape with a peak at a more hydrophilic range compared with other past references.
- 公益社団法人日本薬学会の論文
- 1995-11-25
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