عنوان	Voltammetric immunosensor for human chorionic gonadotropin using a glassy carbon electrode modified with silver nanoparticles and a nanocomposite composed of graphene, chitosan and ionic liquid, and using riboflavin as a redox probe
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Cyclic voltammetry . Electrochemical impedance . Differential pulse voltammetry . Nanomaterial . Hexacyanoferrate . Scanning electron microscopy . Tumor marker . Pregnancy marker . Trophoblasts
چکیده	The aim of this study was to develop an electrochemical immunoassay system to detect of human chorionic gonadotropin (hCG). The immunosensor was constructed by covalent immobilization of silver nanoparticles (AgNPs) onto a nanocomposite containing graphene, chitosan (Chit) and 1- methyl-3-octylimidazolium tetrafluoroborate as ionic liquid (IL). Silver nanoparticles were used as a linker to immobilize hCG antibody onto the modified electrode. The amino groups of the antibody were covalently attached to an AgNP/g-ILChit nanocomposite. Cyclic voltammetry and electrochemical impedance spectroscopy were employed to characterize the assembly process of the immunosensor. Riboflavin was used as the redox probe. Differential pulse voltammetry demonstrated that the formation of antibody–antigen complexes decreases the peak current of redox pair at the AgNP/Gr-IL-Chit/ GCE (at a working potential of−0.38 V). The signal changes of riboflavin are used to detect hCG with broad response ranges from 0.0212 to 530 mIU.mL−1 and a low detection limit of 0.0066± 0.02 mIU.mL−1.
پژوهشگران	محمود روشنی (نفر اول)، اکرم ولی پور (نفر دوم)