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Vancomycin (VAN) is an effective antibiotic due to its broad-spectrum bactericidal action. High performance liquid chromatography (HPLC), a powerful analytical technique is used for the in vitro/in vivo quantification of VAN. The current study was aimed to detect the VAN from in vitro as well as the plasma after the extraction from blood of rabbits. The method was developed and validated according to International Council on Harmonization (ICH) Q2 R1 guidelines. Results showed that the peak of VAN was recorded at 2.96 and 2.57 min, respectively in vitro and serum. The coefficient of VAN turned out to be >0.9994 each for in vitro and in vivo samples. VAN was found linear in the range of 6.2-25000ng/mL. The values of accuracy and precision in terms of coefficient of variation (CV) were less than 2%, indicating the validity of the method. The values for LOD and LOQ were estimated to be 1.5 and 4.5ng/mL, correspondingly, which were lower than the values calculated from in vitro media. Furthermore, the score of the greenness found out to be 0.81, depicting good score using AGREE tool. It was concluded that the developed method was found accurate, precise, robust, rugged, linear, detectable and quantifiable at prepared analytical concentrations and could be used for in vitro and in vivo VAN determination. [ABSTRACT FROM AUTHOR]

P-glycoprotein (P-gP) efflux-mediated multidrug resistance is a fundamental aspect of chemotherapeutic failure in oncology. The current study aims to deliver paclitaxel (PTX) specifically at the target site with improved in vivo efficacy of poorly permeable PTX against solid tumors. Multifunctional polymeric micelles as targeted delivery have been devised for loading and release of PTX. Mucoadhesion, permeation enhancement, oral pharmacokinetics, biodistribution, and toxicological studies were carried out to fully elucidate the therapeutic outcomes of the polymeric micelles. Ex vivo permeation studies indicated a 7.89-fold enhancement in the permeation of PTX with mucopermeating papain functionalized thiolated redox micelles (PT-R-Ms) compared to the pure PTX. Moreover, PT-R-Ms exhibited a higher percentage of apoptotic cells (42.9 ± 0.07%) compared to pure PTX. Biodistribution studies revealed that fluorotagged PT-RMs accumulated in excised tumors and organs. The higher fluorescence intensity indicated the mucopermeation of micelles across the intestine. The orally administered PT-R-Ms efficiently overcome intestinal barriers and inhibit the P-gP efflux pump, resulting in increased bioavailability of PTX (up to 8-fold) in comparison to pure PTX. The enhanced anti-tumor efficacy and reduced toxic effects are key aspects of efficient cancer therapy. This study demonstrates that the use of mucopermeating PT-R-Ms is an encouraging approach to overwhelm the permeation barrier in cancer treatment. [ABSTRACT FROM AUTHOR]