Detection test paper for pyrethroid pesticide residues in foods

Abstract

The invention discloses detection test paper for pyrethroid pesticide residues in foods. The detection test paper is prepared by immersing filter paper in a mixed solution and drying, wherein the mixed solution is prepared from the following components: 3g / L to 70g / L of phosphate buffering solution, 10g / L to 100g / L of chloramine T solution, 6g / L to 120g / L of isonicotinic acid-barbituric acid color developing agent and 5mL to 60mL of dichloromethane-methanol mixed solution, and a solvent which is de-ionized water. The volume ratio of dichloromethane to methanol in the dichloromethane-methanol mixed solution is (80 to 110) to 1. The phosphate buffering solution is obtained by mixing citric acid and phosphate. The mass ratio of isonicotinic acid to barbituric acid in the isonicotinic acid-barbituric acid color developing agent is (1 to 5) to 1. Before the detection test paper is used, the foods are crushed and sieved; then ethyl acetate is added for extracting; centrifuging is carried out and then a proper amount of supernatant is taken; the supernatant is volatilized to be nearly dry and then is dissolved with ethanol to obtain a sample to be detected. The detection test paper provided by the invention is used for detecting the pyrethroid pesticide residues in the foods and operation is simple and rapid; rapid detection on the pyrethroid pesticide residues in agricultural and sideline products is realized, and the detection test paper is suitable for rapid detection on site and in primary laboratories.

Description

technical field [0001] The invention relates to the technical field of food detection, in particular to a test paper for detection of pyrethroid pesticide residues in food. Background technique [0002] Pyrethroid pesticides are broad-spectrum insecticides with quick-acting, high-efficiency, low toxicity, low residue, and safety to crops. In addition to having special effects on more than 140 kinds of pests, some pyrethroid pesticides are also effective on underground pests and Mite pests have a better control effect. Pyrethroid pesticides are especially widely used in the cultivation of vegetables and fruits, and the problem of pesticide residues caused by them is also relatively common. [0003] In the food hygiene industry, food safety problems caused by pyrethroid pesticide residues have long attracted people's attention, and some detection methods for pyrethroid pesticide residues have emerged. However, the existing methods for the analysis of chrysanthemum pesticide ...

AI Technical Summary

Problems solved by technology

However, the existing methods for the analysis of chrysanthemum pesticide residues require complex pretreatment processes such as extraction and purification of samples, and large-scale instruments such as gas chromatography and gas chromatography-mass spectrometry are also required for analysis.

Such existing methods require the use of expensive instruments, pretreatment operations are also very cumbersome, and the detection cycle is very long. It is impossible to achieve fast, low-cost, and on-site detection that is easy to popularize and apply.