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In this paper, we design a signal processing circuit for quartz crystal microbalance (QCM) biosensors. The proposed signal processing circuit, which consists of two oscillators, a mixer, a low-pass filter, can be used to measure small amount of QCM biosensors' frequency variation at a fundamental resonance frequency. Based on the principle of heterodyne technique, the QCM biosensors' frequency variation...
Neopterin is a catabolic product of guanosine triphosphate (GTP), a purine nucleotide. In human biological fluids such as urine, neopterin concentrations indicate the activation of cellular immune activation under the control of T helper cells. High neopterin concentrations in body fluids such as serum or urine also indicate the activation of cellular immunity, which is associated with the reaction...
Neopterin is a catabolic product of guanosine triphosphate (GTP), a purine nucleotide. In human biological fluids such as urine, neopterin concentrations indicate the activation of cellular immune activation under the control of T helper cells. High neopterin concentrations in body fluids such as serum or urine also indicate the activation of cellular immunity, which is associated with the reaction...
The U.S. FDA allows a maximum of 72 mg of caffeine per 12 oz. serving (6 mg/oz) and the tolerance to sleep disruption effects of caffeine develops after consuming 400 mg/day of caffeine 3 times for a week. However, it is still hard for people to estimate how much caffeine is intake daily. On the other hand, (-)epigallocatechin gallate (EGCG) is studied a potent antioxidant that may have therapeutic...
In this paper, we propose a low-cost and portable cyclic voltammetry potentiostat for the electrochemical dopamine biosensor designed with incorporation with artificial antibody (e.g. dopamine-imprinted polymers) as the sensing element. Its performance is evaluated by comparing the calibration curves of a dopamine biosensor with those obtained from very expensive commercial equipment. Experimental...
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