Study On The Reaction Mechanism Of Glucose Sensor And Oil Decay Products

Electrochemical biosensor is a kind of equipment which can induce biology,chemistry parameter and transform signal at some laws. It is an active field of electroanalytics. Measuring blood sugar by glucose sensor is an important application of electrochemistry sensor. Glucose sensor based on nanoparticle is the development direct. In this paper, electron transfer reaction on different electrodes have been tested by cyclic voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS)。During the period of store, oxidation decay made edible oil lose the flavor, reduce the value of nutrition, shorten the edible period and cumulate poisonous substance. It's necessary to deeply study the decay of oil in some respects such as safe storage, nourishment and hygiene. It is tested by gas chromatography and mass spectroscopy (GC-MS) now. Checking by electrochemistry technique is a new idea. In this paper, the process of oil decay have been simulated. Conductance and oxidation capability of this system have been tested. The results lay a foundation for the further study of a new type of electrochemistry sensor.GC and Platinum electrode is modified by different ways. The oxidation of glucose on these electrodes have been tested by cyclic voltammetry. If mediator was added into the solution, the current response was increasing. Because of the appearance of oxidation peak, corresponding signal is easily to be observed. The electrode modified by nanometer Pt and glucose oxidase is better than the electrode modified by glucose oxidase alone. Nanometer Pt with good biocapability, good ability for electron conduction, fine characteristic of wide surface area, high superficial reaction activity and more superficial active center shows high catalytic activity. The mechanism of different systems have been discussed.The Electrochemical Impedance Spectroscopy of glucose oxidation at different voltages have been tested. When the voltage is controled at mediator's oxidation voltage, reaction resistance is the minimum. The impedance spectroscopy of different glucose concentrations have been compared. With the increasement of glucose concentration, the number of glucose moleculars contacted with Glucose Oxidase has been increased. When Fe(CN)₆^3-/4- went across the film, active diffusion area became small, the reaction resistance increased, and reaction resistance of glucose oxidation decreased. The EIS results are consistent with CV measurement.â–¡The oil decay experiment has been simulated using peanut oil and syncretic oil as examples. Some parameters of the decay system have been tested. The results show that the conductance of oil decay system increased, and with the increasement of oil decay products concentration, system conductance also increased. The mechanisms have been briefly discussed. Some suggestions about distinguishment and storage of edible oil have been given. Due to complex oil decay process and various products, the results need to be further discussed.