Poly(aquachlorobis(1,10–phenanthroline)copper(II)iodidemonohydrate)/GCE for simultaneous determination of caffeine and theophylline in human serum, tea, and tablet samples

A Novel Poly(cytosine)-Based Electrochemical Biosensor for Sensitive and Selective Determination of Guanine in Biological Samples

“…The influence of scan rate on the CV response of the bare and poly(cytosine)-based GCEs for [Fe(CN) 6 ] 3–/4– as shown in Figure , was utilized for the determination of the effective electroactive surface area employing Randles-Sevcik equation (eq ). , I p = 2.69 × 10 5 A D 1 / 2 n 3 / 2 C v 1 / 2 where I P = peak current (amperes), n = stands for the number of electrons transferred in a redox cycle, A = the electrode surface area (cm 2 ), C = molar concentration of redox-active species (mol/cm 3 ), D = the diffusion coefficient (cm 2 /s), and v = scan rate in V s –1…”

“…The influence of scan rate on the CV response of the bare and poly(cytosine)based GCEs for [Fe(CN) 6 ] 3−/4− as shown in Figure 4, was utilized for the determination of the effective electroactive surface area employing Randles-Sevcik equation (eq 1). 22,23…”

A new microconductometric sensor based on a PVC membrane including an o‐COSAN ion‐pair complex for the detection of caffeine

“…When comparing the analytical performance of this conductometric sensor to that of the previously published sensors, the detection limit is lower than that of the potentiometric sensor [1] and of the voltammetric sensor on bare BDD [19]. Nevertheless, the voltammetric detection of caffeine in the presence of nanomaterials leads to a lower detection limit, in the range of nM [22][23][24][25][26][27].…”

“…Several metallic oxides were used such as 3D ZnCo 2 O 4 [22], Gd 2 (MoO 4 ) 3 [23], ZnO [24], TiO 2 [25], the obtained detection limits were respectively 11.4 nM, 4.1 nM, 150 nM, 3.3 μM. Some other compounds were used for the sensitive detection of caffeine: phenantroline Cu(II) [26], Cu-MOF [27] and porphyrin [28] leading to respective detection limits 10.2 nM, 19 nM and 14.06 μM. A potentiometric sensors was also designed for the caffeine detection.…”