Quick food security detection device based on cell phone platform
A detection device and food safety technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as high cost, poor selectivity, and difficult preparation of detection raw materials
Active Publication Date: 2015-04-08
SUN YAT SEN UNIV
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Problems solved by technology
However, due to the defects of low sensitivity, poor selectivity, difficult preparation of detection raw materials or high cost of these rapid measurement methods, the wide application of these rapid measurement methods in the market is limited.
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[0009] In the nano-gold colorimetric method, the nucleic acid aptamer is a kind of RNA or DNA single-stranded oligonucleotide that can specifically bind to the target molecule and is screened by the SELEX system. Nucleic acid aptamers can be adsorbed to the surface of gold nanoparticles through electrostatic adsorption to protect the gold nanoparticles. It can keep the gold nanoparticles solution stable after adding high-concentration NaCl solution, and has a characteristic absorption peak at a wavelength of 520nm. When the target molecule that can specifically bind to the nucleic acid aptamer is added in the solution, and the solution that adds the nucleic acid aptamer, the analyte, the nano-gold solution and the NaCl solution is called the nano-gold reaction solution, because the nucleic acid aptamer The specific binding effect between the ligand and the target molecule is greater than its adsorption effect on the gold nanoparticles, and the nucleic acid aptamer is detached f...
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The invention discloses a quick food security detection device based on a cell phone platform. A light choosing instruction is sent to a power control module in a main body by virtue of a control module in a cell phone; the power control module is used for controlling an LED light source I and an LED light source II to operate; when the LED light source I or the LED light source II operates, a light intensity acquisition module in the cell phone controls a CCD camera to photograph and acquire light intensity in two states that nano-gold reaction solutions are added and not added into a cuvette; a colorimetric module in the cell phone can acquire absorbancy of the nano-gold reaction solutions respectively corresponding to the LED light source I and the LED light source II according to the light intensity in accordance with a Lambert beer law formula, and the concentration is acquired according to the linear relation of the specific value of the absorbancy and the concentration of determinands and is displayed on a screen of the cell phone. The device is simple and smart in structure, low in cost, convenient to carry and easy to operate; moreover, quick detection can be accurately carried out in real time and on the spot.
Description
technical field [0001] The invention relates to the field of food safety detection, in particular to a fast food safety detection device based on a mobile phone platform. Background technique [0002] "Food is food to safety first". With the continuous improvement of people's living standards, people are becoming more and more sensitive to food safety issues. At present, food safety testing usually uses standard instruments for testing. Standard instruments can be used to achieve multi-residue testing of multiple pesticides, but complex and expensive instruments and equipment and professional operators are required. In addition, sample pretreatment is cumbersome and time-consuming, and testing costs are high. The need for high-throughput, fast, and online detection. In response to the above shortcomings, some rapid detection methods have emerged, mainly including test paper method, enzyme analysis method, immunoassay method and biochemical sensor. However, due to the defe...
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Inventor 易长青蒋乐伦宋嵘
Owner SUN YAT SEN UNIV