Faculty of Pharmacy
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Item type:Publication, Critical development by design of a rugged HPLC-MS/MS method for direct determination of ibuprofen enantiomers in human plasma(Elsevier BV, 2015-06); ; ;Ugrinova, Liljana; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, CHEMOMETRIC APPROACH FOR OPTIMIZATION OF HILIC METHOD FOR SIMULTANEOUS DETERMINATION OF IMIPENEM AND CILASTATIN SODIUM IN POWDER FOR INJECTION(Informa UK Limited, 2013-12-11); ; ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, High-Throughput HPLC-MS/MS Method for Quantification of Ibuprofen Enantiomers in Human Plasma: Focus on Investigation of Metabolite Interference(Oxford University Press (OUP), 2016-10-12); ; ; ;Tonic-Ribarska, Jasmina - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Headspace screening: A novel approach for fast quality assessment of the essential oil from culinary sage(Elsevier BV, 2016-07); ; ; ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An experimental design approach in optimization of an extraction procedure for AAS determination of Ca, Mg, Zn, Cu and Fe in multimineral dietary supplements(2018-09) ;Anastasova L. ;Kostadinova N.; ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Development and optimization of a generic HPLC method for the simultaneous determination of common ingredients in multi component cough and cold oral drug products using chemometrics(Macedonian Pharmaceutical Association, 2018) ;Zafirova, Marija; ;Ugrinova, Liljana ;Petrovska-Dimitrievska, GabrielaKarchev, Vasil<jats:p>The aim of this work was to develop a single, generally applicable high performance liquid chromatography/diode array detector (HPLC/DAD) method for simultaneous determination of the most frequently used cough and cold active substances and their impurities that would be applicable for a number of possible formulation compositions of cough and cold medicines. The compounds that are separated by the method include eleven active substances: paracetamol, phenylephrine HCl, caffeine, ibuprofen, ascorbic acid, propiphenazone, pheniramine maleate, chlorphenamine maleate, pseudoephedrine HCl, dextromethorphan HBr and cetylpyridinium Cl; five of their impurities: 4-aminophenol, 4-nitrophenol, 4`-chloroacetanilide, chlorphenamine impurity C and ephedrine HCl; and two preservatives: sodium benzoate and propyl parahydroxybenzoate. All 18 compounds were successfully separated on a reversed phase (RP)-HPLC column with superficially porous particles using gradient elution with a very simple mobile phase in 14 minutes with excellent sensitivity and resolution. Method optimization was performed by the design of experiments approach. The proposed method has been validated according to ICH guidelines and proved to be suitable for the simultaneous qualitative and quantitative determination of the selected compounds in different cough and cold dosage forms. Keywords: cough and cold active substances and impurities, HPLC/DAD, superficially porous particles, core-shell particles, chemometrics, design of experiments</jats:p> - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Implementation of quality by design principles in the development of microsponges as drug delivery carriers: Identification and optimization of critical factors using multivariate statistical analyses and design of experiments studies(Elsevier BV, 2015-07-15) ;Simonoska Crcarevska, Maja; ; ; Slavevska Raicki, RenataMicrosponges drug delivery system (MDDC) was prepared by double emulsion-solvent-diffusion technique using rotor-stator homogenization. Quality by design (QbD) concept was implemented for the development of MDDC with potential to be incorporated into semisolid dosage form (gel). Quality target product profile (QTPP) and critical quality attributes (CQA) were defined and identified, accordingly. Critical material attributes (CMA) and Critical process parameters (CPP) were identified using quality risk management (QRM) tool, failure mode, effects and criticality analysis (FMECA). CMA and CPP were identified based on results obtained from principal component analysis (PCA-X&Y) and partial least squares (PLS) statistical analysis along with literature data, product and process knowledge and understanding. FMECA identified amount of ethylcellulose, chitosan, acetone, dichloromethane, span 80, tween 80 and water ratio in primary/multiple emulsions as CMA and rotation speed and stirrer type used for organic solvent removal as CPP. The relationship between identified CPP and particle size as CQA was described in the design space using design of experiments - one-factor response surface method. Obtained results from statistically designed experiments enabled establishment of mathematical models and equations that were used for detailed characterization of influence of identified CPP upon MDDC particle size and particle size distribution and their subsequent optimization. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, High-Throughput HPLC-MS/MS Method for Quantification of Ibuprofen Enantiomers in Human Plasma: Focus on Investigation of Metabolite Interference(Oxford University Press (OUP), 2016-11-30); ; ; ;Tonic-Ribarska, JasminaIn this research, as a part of the development of fast and reliable HPLC-MS/MS method for quantification of ibuprofen (IBP) enantiomers in human plasma, the possibility of IBP acylglucoronide (IBP-Glu) back-conversion was assessed. This involved investigation of in source and in vitro back-conversion. The separation of IBP enantiomers, its metabolite and rac-IBP-d3 (internal standard), was achieved within 6 min using Chiracel OJ-RH chromatographic column (150 × 2.1 mm, 5 μm). The followed selected reaction monitoring transitions for IBP-Glu (m/z 381.4 → 205.4, m/z 381.4 → 161.4 and m/z 205.4 → 161.4) implied that under the optimized electrospray ionization parameters, in source back-conversion of IBP-Glu was insignificant. The results obtained after liquid-liquid extraction of plasma samples spiked with IBP-Glu revealed that the amount of IBP enantiomers generated by IBP-Glu back-conversion was far <20% of lower limit of quantification sample. These results indicate that the presence of IBP-Glu in real samples will not affect the quantification of the IBP enantiomers; thereby reliability of the method was improved. Additional advantage of the method is the short analysis time making it suitable for the large number of samples. The method was fully validated according to the EMA guideline and was shown to meet all requirements to be applied in a pharmacokinetic study.
