Modified Potentiometric Screen-Printed Electrodes Based on Imprinting Character for Sodium Deoxycholate Determination

• Main Authors: Ayman H. Kamel, Samar Ezzat, Mona A. Ahmed, Abd El-Galil E. Amr, Abdulrahman A. Almehizia, Mohamed A. Al-Omar
• Format: Article
• Language: English
• Published: MDPI AG 2020-02-01
• Series: Biomolecules
• Subjects: sodium deoxycholate (nadc); molecular imprinted polymer (mip); screen-printed ion selective electrodes; single-walled carbon nanotubes (swcnts); human serum albumin (hsa)
• Online Access: https://www.mdpi.com/2218-273X/10/2/251

Potentiometric sensors have a great influence on the determination of most various compounds in their matrices. Therefore, efficient and new sensors were introduced to measure sodium Deoxycholate (NaDC) as a bile acid salt. These sensors are based on NaDC imprinted polymer (MIP) as sensory element. The MIP beads were synthesized using thermal polymerization pathway, in which acrylamide (AAm), ethylene glycol dimethacrylate (EGDMA), NaDC, and benzoyl peroxide (BPO) were used as the functional monomer, cross-linker, template, and initiator, respectively. The proposed sensors were fabricated using a coated screen-printed platform and the sensing membrane was modified by single-walled carbon nanotubes (SWCNTs) as an ion-to-electron transducer. The sensors exhibited high sensitivity that reached 4.7 &#215; 10^&#8722;5 M of near-Nernestian slope (&#8722;60.1 &#177; 0.9 mV/decade, <i>r²</i> = 0.999 (<i>n</i>= 5)). In addition, the sensors revealed high selectivity, long lifetime, high potential stability, and conductivity that ensure reproducible and accurate results over a long time. MIP characterization was performed using Fourier Transform-Infrared (FT-IR) and a scanning electron microscope (SEM). Regarding the interaction of NaDC with serum albumin (SA), albumin is determined in human serum samples as human serum albumin (HSA), which was collected from different volunteers of different ages and gender.