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Title:Razvoj in validacija elektroanaliznih metod za določanje epinefrina, askorbinske kisline in sečne kisline : magistrsko delo
Authors:ID Majer, David (Author)
ID Finšgar, Matjaž (Mentor) More about this mentor... New window
ID Vrabelj, Tanja (Comentor)
Files:.pdf MAG_Majer_David_2020.pdf (14,18 MB)
MD5: 52C350F931DCD0E7527259EF011CA806
PID: 20.500.12556/dkum/f5672d3a-ad35-4644-98a6-5e2284e5cdad
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Magistrska naloga prikazuje razvoj in validacijo elektroanaliznih metod za določanje molekul epinefrina (EP), askorbinske kisline (AK) in sečne kisline (SK) z elektrodo iz steklastega ogljika in tehniko angl. square-wave voltametrije. Metode smo razvili in validirali kot nadomestek tekočinski kromatografiji visoke ločljivosti in plinski kromatografiji. Za študij difuzijsko kontrolirane reverzibilnosti sistema kalijevega heksacianoferata in določitev oksidacijsko redukcijskih potencialov analitov smo uporabili tehniko ciklične voltametrije. V sklopu validacije smo za vsak analit posamično preverjali mejo zaznavnosti, mejo določljivosti, linearnost, točnost in natančnost. Izmerjene podatke smo testirali za normalnost s Q-Q grafom in Kolmogorov-Smirnovim statističnim testom. Pri vsaki metodi smo preverjali homoscedastičnost ali heteroscedastičnost umeritvenih točk z analizo ostankov, Hartleyjevim testom, Bartlettovim testom in Cochranovim testom. Zaradi heteroscedastičnega obnašanja analiznih podatkov pri vseh analitih, smo uporabili uteženo linearno regresijo (angl. weighted linear regression) in s tem izboljšali kakovost analitskih rezultatov. Z dobljenim utežnim modelom smo nato preverjali točnost in natančnost metod. Razvite in validirane metode smo uspešno uporabili za analizo realnih vzorcev. Določevali smo vsebnost EP v zdravilu, vsebnost AK v prehranskem dopolnilu in vsebnost SK v človeškem urinu.
Keywords:epinefrin, askorbinska kislina, sečna kislina, elektrokemijske metode, elektroda iz steklastega ogljika, validacija metode, utežna regresija
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[D. Majer]
Year of publishing:2020
Number of pages:XV, 76 str.
PID:20.500.12556/DKUM-76987 New window
UDC:543.55(043.2)
COBISS.SI-ID:31805443 New window
NUK URN:URN:SI:UM:DK:XM4YYMRY
Publication date in DKUM:08.10.2020
Views:1655
Downloads:538
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:06.08.2020

Secondary language

Language:English
Title:Development and validation of electroanalytical methods for the determination of epinephrine, ascorbic acid, and uric acid
Abstract:The master thesis presents the development and validation of electroanalytical methods for the determination of epinephrine (EP), ascorbic acid (AK), and uric acid (SK) using glassy carbon electrode and square-wave voltammetry. The methods were developed and validated as an alternative to the high performance liquid chromatography and gas chromatography. The technique of cyclic voltammetry was used to investigate the diffusion-controlled reversibility of the potassium hexacyanoferrate system and to determine the oxidation-reduction potentials of the analytes. During validation, the detection limit, limit of quantitation, linearity, accuracy, and precision were determined for each analyte individually. The measured data were checked for normality using the Q-Q plot and the Kolmogorov-Smirnov statistical tests. The analysis of the residuals, Hartley's test, Bartlett's test, and Cochran's test were used to check the homoscedasticity or heteroscedasticity of the data for the design of calibration plots. Due to the observed heteroscedastic behavior of the analytical data for all three analytes, a weighted linear regression was used, thus improving the quality of analytical results. The accuracy and precision of the methods were then verified using the resulting weighted model. The developed and validated methods were successfully used for the analysis of real samples by determining the concentrations of EP in a drug, AK in a dietary supplement, and SK in human urine.
Keywords:epinephrine, ascorbic acid, uric acid, electrochemical methods, glassy carbon electrode, method validation, weighted regression


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