A Disposable Homemade Screen Printed Electrochemical Sensor for Vitamin B1 Determination in Multivitamin Ampoules: Potentiometric and Surface Morphology Studies

作者：Issa Yousry M^*; Sherif Omaima E; Dena Ahmed S Abo

来源：Electroanalysis, 2017, 29(5): 1426-1433.

DOI：10.1002/elan.201700034

• Screen printing
• Disposable sensors
• Thiamine
• Vitamin B1
• Surface morphology

Thiamine chloride hydrochloride (TCH) is one of the B-complex vitamins which resemble a very biologically important group of biomolecules. The first screen-printed graphite ion-selective sensor for the determination of TCH was prepared and characterized. The sensor is based on TCH-tetraphenylborate as electrode material. A number of parameters such as the type of solvent mediator, weight percent of the ion-exchanger, test solution temperature and possible interferences were extensively studied. Moreover, the surface morphology of the prepared sensor was studied using scanning electron microscopy. The sensor shows a Nernstian slope of 30.60 +/- 0.07 mV/decade, a low LOD of 5.08x10(-6) mol/L and a wide applicability range of 5.96x10(-6)-1.00x10(-2) mol/L. The sensing graphite ink remains usable for at least one month. Fast potentiometric response was obtained within 5s and remains stable for at least 60s. The sensor was applied to the analysis of TCH in pure solutions and multivitamin ampoules from the Egyptian market using the standard addition method and high recovery values of 97-102% were obtained. Low %RSD values (0.27-1.30) indicate high precision of the proposed sensor. Our sensor provides the advantages of disposability, simple preparation procedures, sensitivity and easy storage and transportation.

• 出版日期2017-5