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• W2012215595 abstract "A Snovel method for the simultaneous separation and determination of two antiglaucoma drugs namely, dorzolamide hydrochloride (DOR) and timolol maleate (TIM) in aqueous humor samples (AH) was developed by using salting-out assisted liquid–liquid microextraction (SALLME) combined with HPLC–UV method. Box–Behnken experimental design and response surface methodology were employed to assist the optimization of SALLME conditions, including salt concentration, the pH of sample solution and vortex time as variable factors. The optimal extraction conditions were as follows: to 50 µL of AH sample, 100 µL of phosphate buffer (100 mmol L−1, pH 11.9), 90 µL of acetonitrile (ACN) and 0.11 g of (NH4)2SO4 salt were added into an Eppendorf vial (1 mL) then vortexed for 1.1 min. As an effort to miniaturize SALLE system, a 1 mL syringe adapted with a capillary tube was employed as the phase separation device. Once the phase separation occurred, the upper layer could be narrowed into the capillary tube by pushing the plunger; thus, the collection of the upper layer solvent was simple and convenient. By miniaturization, the consumption of the organic solvent was decreased as low as possible. The chromatographic separation was achieved on Gemini C18 column using a mobile phase of ACN: 30 mmol L−1 potassium dihydrogen phosphate buffer containing 0.1% triethylamine, pH 3.5 (20:80, v/v) at a flow rate of 1 mL min−1 and UV detection at 254 and 295 nm for DOR and TIM, respectively. Mepivacaine hydrochloride was used as an internal standard. The described method showed better separation with enhanced sensitivities than the previously reported methods with limits of quantitation of 8.75 and 10.32 ng mL−1 in aqueous solution and 15.97 and 23.53 ng mL−1 in AH for DOR and TIM, respectively. The simple, rapid and eco-friendly SALLME–HPLC method has been successfully applied for the simultaneous pharmacokinetic studies of DOR and TIM in rabbit AH." @default.
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• W2012215595 date "2014-12-01" @default.
• W2012215595 modified "2023-10-12" @default.
• W2012215595 title "Simultaneous determination of dorzolomide and timolol in aqueous humor: A novel salting out liquid–liquid microextraction combined with HPLC" @default.
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• W2012215595 doi "https://doi.org/10.1016/j.talanta.2014.06.074" @default.
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