According to the Zhitong Finance App, Jiuqiang Biotech (300406.SZ) issued an announcement. The company recently received a patent certificate issued by the State Intellectual Property Office of the People's Republic of China, involving a patent: “Method and device for detecting frontal phenomena in samples to be tested”.

The invention relates to a method and device for detecting front-band phenomena in samples to be tested. A method for detecting the front-band phenomenon of a sample to be tested includes: obtaining the sample to be tested; processing the original signal response data of the sample to obtain a response curve in which absorbance changes over time; obtaining a second-order derivative of the reaction curve to obtain an inflection point of the reaction curve of the sample to be tested; and comparing the time of the inflection point of the obtained sample to be tested with a predetermined threshold value to determine whether there is a front-band phenomenon in the sample to be tested. The method and device of the invention can obtain a reaction curve in which absorbance changes over time, determine whether there is a front-band phenomenon in the sample by comparing the time at which the second-order derivative of the reaction curve is zero (that is, the inflection point), do not depend on the selection of a time interval on the response curve, and can be used in combination with other predictive pre-band sample methods to improve the reliability of test results.

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