Two seconds to measure the fruit and vegetable "pesticide residue"

【Technological frontier】

Our newspaper Hefei, July 8th (Reporter Ding Yiming) Recently, Jiang Changlong, a researcher at the Institute of Solid Physics, Institute of Solid Physics, Institute of Hefei Material Sciences of the Chinese Academy of Sciences, developed a new and enzyme -free portable sensing platform (hereinafter referred to as the "sensing platform" ), Can be measured in 2 seconds to measure the residue of the glyphosate in the food, and the final concentration result directly displayed directly on the smartphone. Related research results were published in the Materials Materials Magazine.

"Just wet the surface of the fruits and vegetables, wipe it gently on the surface with the test paper. After about 2 seconds, illuminate with ultraviolet lights. You can roughly judge the level of the concentration of glyphosate residue through the test strip color." Jiang Changlong introduced Essence If the test strip is blue, it means that the concentration of the glyphosate is very low; when the test strip is pink, it means that the concentration is high; when the test strip presents orange -red, the concentration is high.

"This method belongs to the first screen, which is suitable for home self -test." Jiang Changlong said that if you want to get more accurate results, you need to put the test strip into the test strip of the sensing platform, and the ultraviolet lights that comes with the sensing platform. Take a test paper photo on a mobile phone, and use the color recognition software of the mobile phone to automatically analyze the conversion to display the final concentration result.

According to Jiang Changlong, the sensor includes sensors, smartphones that can be used to read data, and mobile phone accessories that provide fluorescent detection environment. "The sensor is the main" hero ". , Can quickly identify and detect grass glyphosate. " The principle is to react with the carbon point when the glyphosate is added to the sensor, causing the blue fluorescent of the carbon dot to quickly lying, and the orange fluorescence of the golden nanoplasting cluster remains unchanged. From a visual point of view, the fluorescent color changes in test strips from blue to pink, and eventually become orange -red.

Compared with traditional detection methods, the sensor is more fast and convenient. It can be used for use without professional training, and real -time testing that laboratory testing cannot be achieved. It is suitable for grass -roots environmental supervision departments, farmers' markets and supermarkets, and individual consumers.

It is understood that glyphosate is currently the largest use of herbicides in the world and occupies an important position in organic phosphorus pesticides. "However, it is necessary to point out that pesticide residues are not the same as that of pesticide residues exceeding the standard. According to the residual limit of agricultural residues, the maximum limit of glyphosate residues in China is 4.14 microol." Jiang Changlong explained. If pesticide residues do not exceed the maximum limit, it is safe, and you can eat it with confidence.

"This article reports a fast visual fluorescent sensor platform for quantitative detection of glyphosate. The innovation of this method is to deal with fluorescent signals in combination with smartphones, which is convenient and accurate. Fluorescent substances as signals, not dependent on enzymes, have certain application potential in on -site detection, "said a reviewer.

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