Electrochemically deposited nanocomposite of chitosan and carbon nanotubes for detection of human chorionic gonadotrophin

Carbon nanotube–chitosan composite electrodes for electrochemical removal of Cu(II) ions

“…These polymers can bring a hydrophilic surface on CNT and create more sorption sites. One of the common polymers that is used for the modification of CNT is chitosan (CS) [19,20]. As an inexpensive, widely used and nontoxic polysaccharide biopolymer, CS displays excellent film-forming ability, high hydrophilicity, and good biocompatibility [21][22][23][24].…”

Electrochemical biosensors for hormone analyses

“…For the performance stability of the biosensors. Yang et al (2011aYang et al ( , 2011b and Tan et al (2007) found that their biosensors retained 93.5% and 90% of its initial current after a storage period of 30 days. Tao et al (2011) found that the response current of their hCG immunosensor decreased to 87.6% after 60 days.…”

“…On the other hand hCG is one of the most important carbohydrate tumor markers (Yang et al, 2011a(Yang et al, , 2011bTeixeira et al, 2014aTeixeira et al, , 2014bTao et al, 2011). Tan et al (2007) used horseradish peroxidase-labeled human chorionic gonadotrophin antibody (HRP-anti-hCG) as a model and immunoreaction between hCG in sample solution and the immobilized HRP-anti-hCG caused decrease in peak current of HRP and linearly with an increase in hCG concentration.…”

“…Tan et al (2007) used horseradish peroxidase-labeled human chorionic gonadotrophin antibody (HRP-anti-hCG) as a model and immunoreaction between hCG in sample solution and the immobilized HRP-anti-hCG caused decrease in peak current of HRP and linearly with an increase in hCG concentration. Yang et al (2011aYang et al ( , 2011b and Tan et al (2007) investigated reproducibility of their immunosensor for hCG with intra-assay precision and inter-assay precision. The RSD values show that, the biosensors have an acceptable reproducibility.…”

“…Tao et al (2011) found that the response current of their hCG immunosensor decreased to 87.6% after 60 days. Yang et al (2011aYang et al ( , 2011b Estradiol (17β-estradiol, E2) is a natural estrogen that has a vital role in various physiological processes and also has a particular impact on the reproductive and sexual functioning. Liu and Wong characterised their E2 electrochemical immunosensor by using several precision and recovery studies.…”