Browsing by Author "Krehula, Stjepko"
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- Construction of sensor for submicromolar detection of riboflavin by surface modification of SPCE with thermal degradation products of nickel acetate tetrahydratePublication . Ognjanović, Miloš; Stanković, Dalibor M.; Jaćimović, Željko K.; Kosović‐Perutović, Milica; Mariano, José F. M. L.; Krehula, Stjepko; Musić, Svetozar; Antić, BratislavNickel acetate tetrahydrate (NAT) sample series were used to modify screen-printed carbon electrodes (SPCE). The samples were hybrid Ni/NiO nanocomposites, where the NiO phase increased with an applied treatment temperature. Results of electrochemical measurements pointed that the Ni/NiO550/SPCE-modified electrode had the best analytical performance toward the detection of riboflavin (RF). The Ni/NiO550/SPCE-based sensor showed linear response with RF in the concentration range of 0.5-75 mu M and 0.15 mu M LOD in BRBS. Sensor offered fast response time, good repeatability, and selectivity with an RSD of 1.4 %. Our results show that the Ni:NiO nanocomposite ratio strongly influenced the electroanalytical performance of SPCE.