Abstract
Pesticide residue is a major problem in food safety. It is particularly important to detect pesticides in fruits and vegetables quickly and effectively The near infrared spectroscopy (NIR) technique was explored as a technique to predict organochlorine pesticides in Mesona chinensis Benth. Fourty-three samples were sacaned powder in a Antaris II FT-NIR. Samples were split into two sets, one set used as calibration (n=35) where the remaining samples (n=S) were used as validation set. The hexachlorocyclohexane (BHC). dichlorodiphenyltricliloroethane (DDT) and organochlorine residues were determined by gas chromatography as the reference ratio. The prediction model of total BHC. DDT and organochlorine of mesona chinensis benth was established by partial least square (PLS) method, which were optimized by the optimal spectral band range, spectral pretreatment and regression. Moreover, the prediction ability of the model was verified by validation set. The models gave the results that RMSEC. Rc. RMSEP and Rp of BHC. DDT and organochlorine residues respectively were 0.996. 0.9384, 0.151 and 0.9964; 1.21, 0.9889. 0.409. 0.9852: 2.21. 0.9423, 0.481, 0.9953. The relative errors of the predicted values are within 0.68% - 0.38% and - 0.34% - 6.88% and - 0.46% - 0.58% of the total validation set. It can be seen that the three models have good prediction effect, high precision and high stability, that is. NIR can be used as a simple, non-destructive, reliable and rapid method for the determination of organochlorine pesticide residues in mesona chinensis benth.
Highlights
Mesona chinensis Benth (Chinese Mesona), known as xiān cǎo (仙草), xiānrén cǎo (仙人草), is an annual herb of the genus Senna in the Lamiaceae family, which is widely distributed in Guangdong, Fujian and Yunnan province in China[1]
The residues of total benzene hexachloride (BHC) (α-BHC, β-BHC, γ-BHC, δ-BHC), total DDT (p,p'-DDE, p,p'-DDD, o,p'-DDT, p,p'-DDT) and PCNB of nine organochlorine pesticides in 35 samples were determined and calculated by gas chromatography combined with reference methodology
The results in table1 showed that the total residues of organochlorine pesticides in the samples were within the standard range, which the total amount is ranged from 0 to 34.81 mg/g
Summary
Mesona chinensis Benth (Chinese Mesona), known as xiān cǎo (仙草), xiānrén cǎo (仙人草), is an annual herb of the genus Senna in the Lamiaceae family, which is widely distributed in Guangdong, Fujian and Yunnan province in China[1]. Mesona chinensis Benth is a natural high-grade and dual-use plant resource for medicine and food, with an extremely high nutritional value and potential health care effects[3]. Organochlorine pesticides commonly used in Mesona chinensis Benth mainly include benzene hexachloride (BHC) and dichlorodiphenyltrichloroethane (DDT). The analysis of these compounds by gas chromatography (GC), which requires sample preparation, specific analytical equipment and is time-consuming. For these reasons, it is extremely urgent to develop a pesticide residue measurement technology with high environmental protection, low cost and less detection time
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