Nikola Sakač

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The aim of this research was to investigate the influence of modification with succinic acid/acetic anhydride and azelaic acid/acetic anhydride mixtures on thermophysical and pasting properties of wheat starch. Starch was isolated from two wheat varieties and modified with mixtures of succinic acid and acetic anhydride, and azelaic acid and acetic anhydride(More)
A new sensitive potentiometric surfactant sensor was prepared based on a highly lipophilic 1,3-didecyl-2-methyl-imidazolium cation and a tetraphenylborate antagonist ion. This sensor was used as a sensing material and incorporated into the plasticized PVC-membrane. The sensor responded fast and showed a Nernstian response for investigated surfactant(More)
The development of a portable testing device for detecting Human Salivary α-Amylase (HSA) is very timely since such an enzyme is a valuable biomarker for diagnosing many diseases and monitoring the human stress. We show that an easy-to-use and robust device like the Quartz-Crystal Microbalance (QCM) can be a suitable platform for HSA sensing with a limit of(More)
Stress was firstly defined in 19351, as a reaction of humans to external stimuli. In the modern way of life and every day actions, the term stress is very common and has a significant influence on human reactions, health, work ability and mood. There is also a direct connection between stress and depression in humans2. Apart from adults, recent studies show(More)
A platinum redox sensor for the direct potentiometric determination of α-amylase concentration has been described. The sensor measured the amount of triiodide released from a starch-triiodide complex, which was correlated with the α-amylase activity after biocatalytic starch degradation. The composition and stability of the potassium triiodide solution was(More)
Estimation and Optimization of Potentiometric Sensor Response Parameters from Surfactant Titration Data Using Microsoft Excel Solver and Mathematica Milan Sak-Bosnar1 ∗, Dubravka Madunić-Čačić2, Nikola Sakač1, Mirela Samardžić1, and Želimir Kurtanjek3 1Department of Chemistry, Josip Juraj Strossmayer University of Osijek, F. Kuhaèa 20, HR-31000 Osijek,(More)
A home-made microchip electrophoresis (MCE) device was used to quantitate two biologically important histidine dipeptides, carnosine and anserine, using capacitively coupled contactless conductivity detection (C4D), at pH 2.7. The C4D detector exhibited a linear response to both carnosine and anserine in the range of 0-200μM for the individual dipeptides(More)
Here, we describe the development of a platinum redox sensor for the direct potentiometric quantification of starch in solution. The sensor measures the decrease in free triiodide ion after it complexes with starch to form a starch-triiodide complex. This decrease was, therefore, correlated with starch concentration, and the composition and stability of the(More)
A novel method for the determination of diastase activity is reported. The method is based on a direct potentiometric measurement of triiodide ion that is released when a starch-triiodide complex is hydrolysed by honey diastase. The increase of free triiodide ion concentration in a sample is found to be directly proportional to the diastase activity of the(More)
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