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- W2801786723 abstract "This study aims to investigate factors affecting weakly basic drugs liposomal systems. Resolution V fractional factorial design (2V5−1) is used as an example of screening designs that would better be used as a wise step before proceeding with detailed factors effects or optimization studies. Five factors probable to affect liposomal systems of weakly basic drugs were investigated using Amisulpride as a model drug. Factors studied were; A: Preparation technique B: Phosphatidyl choline (PhC) amount (mg) C: Cholesterol: PhC molar ratio, D: Hydration volume (ml) and E: Sonication type. Levels investigated were; Ammonium sulphate-pH gradient technique or Transmembrane zinc chelation-pH gradient technique, 200 or 400 mg, 0 or 0.5, 10 or 20 ml and bath or probe sonication for A, B, C, D and E respectively. Responses measured were Particle size (PS) (nm), Zeta potential (ZP) (mV) and Entrapment efficiency percent (EE%). Ion selective electrode was used as a novel method for measuring unentrapped drug concentration and calculating entrapment efficiency without the need for liposomal separation. Factors mainly affecting the studied responses were Cholesterol: PhC ratio and hydration volume for PS, preparation technique for ZP and preparation technique and hydration volume for EE%. The applied 2V5−1 design enabled the use of only 16 trial combinations for screening the influence of five factors on weakly basic drugs liposomal systems. This clarifies the value of the use of screening experiments before extensive investigation of certain factors in detailed optimization studies." @default.
- W2801786723 created "2018-05-17" @default.
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- W2801786723 date "2018-07-01" @default.
- W2801786723 modified "2023-09-28" @default.
- W2801786723 title "Resolution V fractional factorial design for screening of factors affecting weakly basic drugs liposomal systems" @default.
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- W2801786723 doi "https://doi.org/10.1016/j.ejps.2018.04.028" @default.
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