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Application of the spectral image recognition module to pesticide residue risk control

Taiwan Agricultural Chemicals and Toxic Substances Research Institute, COA, Executive Yuan R.O.C.
Tseng Chao-Ming (Associate Researcher)
Tel:886- 4-2330-2101 ext. 415
Email:cmtsen@tactri.gov.tw

Agricultural product prices are mainly determined by the quantity of supply and demand, taste, and appearance. In Taiwan, which is located in tropical and subtropical regions, farmers often use pesticides in the planting process to reduce plant diseases and insect pests and improve crop yields. However, with the rise of consumers’ awareness of food safety and health, more and more attention has been paid to the pesticide residue risk in agricultural products. Compliance with good operation specifications and rational use of pesticides can effectively reduce excessive pesticide residues. However, due to many sources of agricultural products, consumers, distributors, and gatherers can only passively learn that the products fail to pass the sampling inspection standards of health units after purchases or consumption. In addition to adverse health effects, violation fines and destruction of returned goods are unbearable losses for production and marketing units. At the international level, the safety traceable agricultural product production model established by good field specifications and independent screening tools can ensure the food safety of Chinese people and enhance the brand values of agricultural products.

Therefore, Taiwan Agricultural Chemicals and Toxic Substances Research Institute (TACTRI) develops a quick screening technology for on-site real-time detection of pesticide residues in fruits and vegetables by surface-enhanced Raman spectroscopy (SERS), to greatly enhance Raman signals of pesticide molecules through the patented measurement procedure. After combining this technology with the high-stability and high-sensitivity metallic columnar nano-structured chips developed by a Taiwanese company, its price is reduced to only 1/5 of similar international products, which shows technical and cost advantages. On this basis, Raman scattering spectra of more than 200 pesticide molecules are established, and the Raman frequency shift and peaks can be used to compare the types and content ranges of pesticide residues in fruits and vegetables, so as to meet the requirements of qualitative and semi-quantitative screening. For crops with complex substrates, such as spices, tea, strawberries, and other agricultural products with high economic values, the artificial intelligence of machine learning is introduced to improve the screening rate or effectively conduct product rating with full-spectrum identification as the decision mechanism. The atlases of qualified samples (pesticide residues are not detected or lower than the allowable limit) are used to train AI to learn, produce identification models, and calculate the outlier degree of atlases of individual samples. The differences between the unknown samples and the qualified samples are quantified to reflect the risk level of pesticide residues in samples. This identification module can be applied to Raman and infrared spectrogram, and the measurement items are not limited to the determination of pesticide residue risk. A quick screening test for additives such as bleach and preservatives in food, medicine, cosmetics, and health products has been developed.

This technology is compatible with the current public pre-processing for pesticide residue analysis. If it is combined with FaPEx®, the rapid extraction purification kit developed by us, the extraction time is reduced by more than 80%, and the detection results can be obtained in 20 minutes, which is far less than the period required in the previous pesticide detection report. Through technology transfer, this technology has been introduced to four group catering companies, five rural associations and village offices, three vegetable and fruit transportation and marketing companies, and four rice, grain, vegetable, and fruit processing companies. A total of 16 companies adopt this technology independently, and 20,000 independent inspection cases have been completed in the past two years. Compared with previous outsourced testing, Raman quick test can increase the screening frequency by 30% and reduce inspection fees by more than 50%, and effectively reduce the losses caused by non-conformity before agricultural products are supplied to distributors. For international trade products, through method verification, customized screening methods established by spectrum detection and image identification models help to strengthen the control abilities of the upstream manufacturers and reduce inspection fees of import-export companies.


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