Blood glucose detector - electrochemical method and light reflection method
The electrochemical method uses the principle of detecting the current signal generated in the reaction process to reflect the blood glucose value. The electrons generated by the reaction between the enzyme and glucose pass through the current counting facility, read the number of electrons, and then convert them into glucose concentration readings.
The light reflection method is to detect the color change of the test strip during the reaction process to reflect the blood glucose value. The intermediate (colored substance) produced by the reaction between the enzyme and glucose is used to detect the intensity of the reflected light on the reflecting surface of the test paper with the detector, and the intensity of these reflected light is converted into the glucose concentration.
The advantage of light reflection technology is that it is relatively mature and stable, and in case of emergency, it can assist in judging the level of blood glucose by visually checking the color change on the back of the test paper. However, this method will produce errors when operating in strong light environment (such as outdoor in summer); In addition, when patients with hyperlipidemia and hyperbilirubinemia are tested with this household blood glucose meter, the error will also increase.
The electrochemical principle will not be disturbed by the above two factors, but the microwave oven and mobile phone in use will affect the accuracy of the instrument; Therefore, when using this kind of instrument for blood glucose monitoring, the instrument should be protected from electromagnetic radiation. You can choose according to the actual use.
For any method, the test paper has a certain detection range. Beyond this range, there is no linear relationship between blood glucose concentration and potential or color depth. Above a certain concentration, the electrochemical instrument is saturated and is no longer sensitive to the change of blood glucose.