A simple, sensitive and selective method has been developed for quantification of Almotriptan (AL) in human plasma using Almotriptan-d6 (ALD6) as an internal standard. Almotriptan and Almotriptan-d6 were detected with proton adducts at m/z 336.1→201.1 and 342.2→207.2 in multiple reaction monitoring (MRM) positive mode, respectively. The method was linear over a concentration range of 0.5–150.0 ng/mL. The limit of detection (LOD) and limit of quantification (LOQ) for Almotriptan were 0.2 pg/mL and 0.5 ng/mL, respectively. Liquid-liquid extraction was used followed by MS/MS (ion spray). The method was shown to be precise with an average within-run and between-run variation of 0.68 to 2.78% and 0.57 to 0.86%, respectively. The average within-run and between-run accuracy of the method throughout its linear range was 98.94 to 102.64% and 99.43 to 101.44%, respectively. The mean recovery of drug and internal standard from human plasma was 92.12 ± 4.32% and 89.62 ± 6.32%. It can be applied for clinical and pharmacokinetic studies.
Diloxanide Furoate is a Dichloroacetamide derivative utilized for the treatment of various protozoal infections like amoebiasis. Colon targeted tablets were designed using pH sensitive polymers like Eudragit S100, Eudragit L 100,Cellulose acetate phthallate at different concentrations. All the matrix,compression coated formulations showed the desired physicochemical properties as per the official limits. The drug release studies were performed according to the USP paddle method by using 0.1N HCL for 2 hours, pH 7.4 phosphate buffer for 3 hours and pH 6.8 phosphate buffer upto 18 hours. A better controlled drug release was shown for Eudragit L 100. Based on the comparative drug release studies among different Formulations F9 with Eudragit L 100 polymer showed better control drug release. The release kinetics for the Optimised Formulation F9 was calculated and “r2” value was more for Zero order kinetics i.e.,0.970 indicating that the formulation doesnot depend upon its concentration and from the Korsmeyer peppas model the diffusion exponent value “n” is > 1 indicating that it follows super case II transport mechanism. The accelerated stability studies conducted for optimised formulation F9 for 3 months have no significant variation.
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