Sample pretreatment method for pesticide residue analysis in food
2020-11-26 14:21:42
Food safety not only affects the health of consumers, but also affects the development of the food industry. Therefore, food safety issues have become a hot issue of general concern. The following is a brief introduction to sample pretreatment methods for pesticide residue analysis in food: ultrasonic extraction and solid phase extraction.
Ultrasonic extraction
There is literature to verify that since the first discovery of the role of ultrasonic in the accelerated response in 1928, the development of ultrasonic chemistry and its technology is very rapid, widely used in chemical and chemical, medical, pesticide and food processing. Ultrasonic chemistry is the use of ultrasonic waves to accelerate the chemical reaction of a substance or initiate a new reaction pathway or improve its physical and chemical properties such as dissolution and crystallization distribution, in order to increase the chemical reaction yield or obtain a new chemical reaction substance or improve the separation and extraction efficiency of the substance.
Ultrasonic extraction has been reported for the analysis of pesticide residues in foods. Zheng Shenxi et al. used six different pretreatment methods to extract and purify organochlorine pesticides in tea, and to increase the extraction efficiency by prolonging the soaking time or increasing the oscillation intensity. Comparing the six experiments, the results showed that the soaking overnight oscillates The yield of the 0.5h sample is high (including ultrasonic oscillation and mechanical oscillation); the extraction rate of the sample is significantly improved when the ultrasonic vibration is 0.5h than the mechanical oscillation for 0.5h. Under the same purification conditions, there was no significant difference in the extraction rate of the samples obtained by the two methods compared with the soaking for 1 h. Zhu Aijun et al. used ultrasonic extraction, Florisil silica column purification, methanol/water as mobile phase, detection wavelength of 235nm, and high-performance liquid chromatography to determine the amount of atrazine residues in crops and soil. Comparing the recovery rates of ultrasonic extraction and oscillating extraction, the results showed that the recovery rate of atrazine in soil and crops by ultrasonic method was 94%-97%, which was greater than the recovery rate by oscillation method. In summary, ultrasonic extraction is an effective method for sample pretreatment of pesticide residues in food.
2. Solid phase extraction (SPE)
Solid phase extraction (SPE) uses a solid adsorbent to adsorb a target compound in a liquid sample, separate it from the matrix and interfering compound in the sample, and then elute with the eluent to achieve the purpose of separating and purifying the target compound. SPE can be used for the extraction of trace or target compounds in complex samples, as well as for the purification and enrichment of target compounds. It is one of the mainstream techniques for sample pretreatment in residual analysis. At home and abroad, SPE technology has been widely used in the detection of water pollution by pesticides.
Our company has various specifications of ultrasonic and solid phase extraction instruments for sample pretreatment of pesticide residue analysis in food.
Surgical Gelatin Sponge,Hemostat Gelatin Sponge,Absorbable Gelatin Powder,Hemostatic Absorbable Gelatin Sponge
Shaoxing Aladdin Enterprise Co.,Ltd , https://www.xhemostat.com