Method for quantitative detection of amino acid content in grain by THz-TDS technology

Abstract

The invention relates to a method for quantitative detection of the amino acid content in grain by a THz-TDS technology. The method includes: grinding and tabletting a to-be-detected grain sample to obtain a to-be-detected grain tablet sample, conducting testing by THz-TDS to obtain a terahertz time-domain spectroscopy, carrying out Fourier transformation and Timothy and Duvillaret calculation to obtain a frequency domain spectrum and an absorption coefficient spectrum, at the same time, testing a target amino acid tablet sample in the same way so as to determine the characteristic wave band of the target amino acid, randomly dividing the absorption coefficient spectrum at the characteristic wave band of the to-be-detected grain tablet sample into a training set sample absorption coefficient spectrum and a validation set sample absorption coefficient spectrum, and establishing a quantitative analysis model of the absorption coefficient spectrum by a partial least squares regression technique so as to acquire the quantitative detection value of each o-be-detected grain tablet sample. The method provided by the invention can truly and effectively realize fast and accurate quantitative detection on pesticide residue in grain, and the average value of the absorption coefficient spectrum quantitative analysis model's prediction related coefficients is up to 0.993.

Description

technical field [0001] The invention relates to a method for quantitatively detecting amino acid content in grain by using THz-TDS technology, and belongs to the technical field of amino acid detection. Background technique [0002] The nutrition that human beings depend on exists in food. Amino acid is the nutrient of the human body. If the intake is insufficient, it will cause loss of appetite and fatigue; It is important to have foods that provide amino acid balance. At the same time, high-level animal production is also related to feed formulation, amino acid formulation and supplementation. Appropriate addition of amino acids in feed can significantly improve the nutritional value of feed, but excessive addition may inhibit the growth of animals. With the improvement of living standards year by year, food quality and safety issues have become the focus of the whole society, especially in recent years about the emergence of illegal use of amino acids in food, such as ex...

AI Technical Summary

Problems solved by technology

However, the above-mentioned method of using near-infrared spectroscopy to detect the content of amino acids in peanuts has the following problems: the near-infrared spectroscopy is based on the multiplication and combined frequency absorption of internal molecular vibrations, the spectral peaks are wide, the overlap is serious, and the absorption intensity is weak

Due to the wide spectral peaks of the near-infrared spectrum, the corresponding characteristic absorption peaks of the substance cannot be directly identified from the near-infrared spectrum, so it is necessary to use the full-spectrum data to build a model, and it is easy to introduce more noise information

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