Tapioca Biofilm Containing Nitrogen‐doped Titanium Dioxide Nanoparticles for Electrochemical Detection of 17‐β Estradiol

Abstract

A novel sensor architecture based on thin film of tapioca decorated within nitrogen‐doped titanium dioxide (N‐TiO2) nanoparticles is reported. The nanostructures were characterized by scanning electron microscope, transmission electron microscope, X‐rays diffraction and voltammetric techniques. The proposed electrode was used for detection of low concentrations of 17‐β estradiol in without purification step, which was investigated by using linear sweep adsorptive stripping voltammetry. Under optimal conditions, the analytical curve was linear over a 17β‐estradiol concentration range of 9.9×10−6 to 1.4×10−5 mol L−1, with a detection limit of 1.7×10−7 mol L−1. The tapioca and N‐TiO2 nanoparticles homogeneous film was applied for detection of 17‐β‐estradiol in tap water and synthetic urine samples, which presented satisfactory results.

Starch-Mediated Immobilization, Photochemical Reduction, and Gas Sensitivity of Graphene Oxide Films

“…The constituents of ST can tailor the chemoresistive response of carbon nanotubes (CNTs) sensors by adopting different chain conformations at the sensoactive layer . In addition, ST can be employed as a stable matrix to immobilize a myriad of electroactive species, including TiO 2 nanoparticles, reduced graphene oxide (RGO), gold nanoparticles, tyrosinase with nanodiamond, and amorphous carbon nanoparticles, to be further employed in the electrochemical detection of estradiol, estriol, epinephrine, tetracycline, phenolic compounds, , and iodide . In all of these examples, the electrical insulating behavior of ST is counterbalanced by its film-forming ability, innocuous nature, low cost, and ready availability.…”

Green flexible electronics based on starch

“…The RGO-GNPS-PS also effectively recycled 92.1-106% of estriol in natural water samples and synthetic urine. Similar strategies were used to fabricate electrochemical sensors for the detection of various chemicals [88][89][90][91][92] , in which the starch played an important role such as the substrates.…”

Electrochemical Sensor Based on Multi‐walled Carbon Nanotube/Gold Nanoparticle Modified Glassy Carbon Electrode for Detection of Estradiol in Environmental Samples

“…In electrochemistry, the use of modified electrodes is very common; recent strategies for estradiol detection include different nanomaterials [12][13][14], molecularly imprinted polymers [3,[15][16][17], and antibodies [18][19][20][21]. E2 has been determined at different electrodes, including hanging mercury [22], boron doped diamond [23], graphite [12,13] but predominantly glassy carbon with different modifiers: carbon nanotubes [12,24,25], graphene [14,26], nanoparticles [13,17,27], or polymers [2,28,29].…”