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This research aims to develop an electrode carbon paste/molecularly imprinted polymer (MIP) as a sensor for the analysis of creatinine by potentiometric. The preparation of a non-imprinted polymer (NIP) is done by mixing aniline, creatinine, and potassium peroxodisulfate with mole ratio of 2:0.1:1. Creatinine is extracted from the polymer using hot...
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... characterization using X-ray diffraction (XRD) was con- ducted to determine crystallinity of polyaniline. A polyaniline diffraction pattern can be seen in Fig. 5, which shows that the emerged sharp peak diffraction pattern at 2h = 25.5°. The diffrac- tion patterns emerge due to periodicity perpendicular to the ben- zoid ring and quinoid of polyaniline polymer ...
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This research aims to develop an electrode carbon paste-molecularly imprinted polymer (MIP) as sensor for the analysis of creatinine by potentiometric. The preparation of non-imprinted polymer (NIP) is done by mixing aniline, creatinine and potassium peroxodisulfate with mole ratio of 2:0.1:1. Creatinine is extracted from the polymer using hot wate...
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... In the potentiometric method used two electrodes, the working electrode and reference electrode. [4][5][6][7][8] The function of the working electrode is censoring the analyte in the solution being analyzed, so that the working electrode must be selective and sensitive to analyte. Electrodes used for potentiometric analysis can be modified with the aim to increase the selectivity and sensitivity to analyte. ...
This research aims to develop an electrode carbon paste-molecularly imprinted polymer (MIP) as sensor for the analysis of creatinine by potentiometric. The preparation of non-imprinted polymer (NIP) is done by mixing aniline, creatinine and potassium peroxodisulfate with mole ratio of 2:0.1:1. Creatinine is extracted from the polymer using hot water to form mold creatinine, this so-called MIP. In this study, the optimum electrode having composition made of activated carbon, paraffin, and MIP of 40:35:25 (mass ratio) and response time for 91-192 seconds. Nernst factor obtained from this study was 23.2 mV/decade, the measuring range of 10-6-10-3 M, lower detection limit of 5.49 x 10-6 M and the upper detection limit of 1.07 x 10-3 M. The accuracy of methods for concentration of 10-6-10-3 M was 76.40%-165.80% and the precision is expressed by the coefficient of variation for the concentration is 0.05%-0.32%. The electrodes are still well used up to 83 times of usage. Urea does not interfere with the performance of the electrode carbon paste-MIP on the analysis of creatinine.
BHT as an antioxidant is essential because it can prevent the rate of oxidative reactions from organic compounds present in the product. However, the use of BHT can have harmful effects on health because it can trigger a carcinogenic reaction. Therefore, precise and accurate instruments are needed to measure BHT concentrations. Carbon paste electrode is a renewable material that can analyze a compound currently being developed and attracts much attention. EPK has a stable response, low electrical resistance, a quickly renewable surface for electron exchange, and can be adapted for various chemical compound detection applications. EPK modified with MIP has high chemical and physical stability, an inexpensive preparation process, excellent selectivity, and sensitivity but also a fast response to the target compound. This study aims to improve the performance of MIP-modified EPK to measure BHT optimally in terms of pH, concentration, and solution components. Optimization of EPK in BHT measurement was carried out using an experimental method using voltammetry with the CV technique. The optimum composition obtained is 1:3, the optimum cycle for electropolymerization is five cycles, and the optimum pH for BHT measurement is pH 5 with a peak oxidation current of 18,937 µA. EPK-MIP optimization results obtained can be used to measure BHT with optimal performance.
A solid-state polyvinylchloride (PVC)-membrane potentiometric creatinine-selective microsensor based on a creatinineimprinted polymer was developed. For the imprinted polymer synthesis process; creatinine, methacrylic acid and ethylene glycol dimethacrylate (EGDMA) were used as template molecule, functional monomer and crosslinker, respectively. By using the obtained creatinine-imprinted polymer as an ionophore, a selective response was obtained towards creatinine in the PVC-membrane structure. The potentiometric performance characteristics (linear operating range, detection limit, selectivity, slope, response time, lifetime, pH and temperature, etc.) of the creatinine-selective microsensor were investigated. The prepared microsensor exhibited Nernst behavior in the concentration range of 10-1-10-5 mol.L-1 with a slope of 57.2±1.2 mV (R2: 0.9979). The developed microsensor was used for approximately six weeks without significant differences in the potentials optained for creatinine. The detection limit of the developed microsensor was 5.0x10-6 mol. L-1 and the response time was rather short (<15 s). The pH working range of the microsensor was determined as 6.0-10.0. Using the developed microsensor, the creatinine determination was successfully performed in synthetic samples. The obtained potentiometric data were compared with the results obtained by UV spectroscopy method. The obtained results were in good harmony in 95% confidence level.
A phenol imprinted polymer modified electrode has been prepared by electropolymerization technique in the solution containing aniline as monomer and phenol as a template onto carbon paste electrode surface. A potentiometric method was used to evaluate the performance of the electrodes. Optimization of aniline and phenol composition and a number of polymerization cycles was investigated based on the Nernstian factor. The performance of the electrode sensor is affected by the pH of the analyte solution. Based on the potential response of three different electrodes, it is known that MIP modified electrode has better sensitivity than non-imprinted electrode or bare carbon paste electrode.
