Yu Jicheng
Dalian Nationalities University
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Featured researches published by Yu Jicheng.
international conference on new technology of agricultural engineering | 2011
Yu Jicheng; Liu Qiu; Qi Xiaohui; Guo Naifei
The applicability of supercritical fluid extraction (SFE) in organophosphorus pesticide multi-residue analysis in vegetable samples was investigated. Fortification experiment and orthogonal test based on the trichlorfon as investigating target were conducted to optimize the extraction procedure in SFE by varying the CO2 flow, extraction oven temperature, outlet temperature and pressure. The best efficiency was achieved at 18mL·min−1, 60°C, 80°C and 350 bar, respectively. The analytical screening was performed by capillary gas chromatography equipped with flame photometric detector (FPD). Recoveries for the majority of pesticides from spiked samples of vegetable with the fortification level of 0.04–0.10 mg·kg−1 ranged from 80.5 to 97.3%, and the relative standard deviation (RSD) was from 2.9 to 8.4. The detection limits were from 0.008 to 0.035 mg·kg−1 for FPD, and meeting the requirement set of native standard. The optimized SFE method is a simple,low cost, environment-friendly and an effective preparation method for determination of pesticide multi-residue at trace level in leafy vegetables in comparison with solid-liquid extraction method.
international conference on new technology of agricultural engineering | 2011
Guo Nai-fei; Ji Shujuan; Yu Jicheng
In this work, the chlorothalonil derivative (i.e. hapten) was synthesized. The chlorothalonil artificial antigens were prepared via the hapten conjugated with carrier proteins by activated-ester and mixed-anhydride method, respectively. The antiserum were obtained through immunizing the New Zealand white rabbits with the immune antigen, and the appropriate concentrations of coating antigen and antibody of ELISA were determined with chessboard format. Meanwhile, the influence factors of washing processes were also investigated, which evaluated by the value of OD490. The results showed that the artificial antigens of chlorothalonil were successfully synthesized, and the antiserum titer was about 1∶1.0×104. The detection limit (IC20) of ELISA was 0.0123ng/mL. The recoveries of ELISA were from 84.0% to 89.8%, Coefficient of variation ranged from 3.0% to 7.6%. And all the Cross-reactivity (CR) with chlorothalonil analogous structure compounds were less than 0.01%.
Archive | 2017
Liu Qiu; Yu Jicheng; Chen Chao; Qi Xiaohui
Archive | 2015
Liu Qiu; Yu Jicheng; Pan Junhua; Liu Changjian
Archive | 2015
Yu Jicheng; Liu Qiu; Yan Jianfang; Pan Junhua
Archive | 2015
Liu Qiu; Yu Jicheng; Pan Junhua; Qi Xiaohui; Song Yanchao
Archive | 2015
Liu Qiu; Yu Jicheng; Pan Junhua; Yan Jianfang
Archive | 2015
Yu Jicheng; Liu Qiu; Qi Xiaohui; Pan Junhua
Archive | 2015
Liu Qiu; Yu Jicheng; Pan Junhua; Liu Changjian
Journal of Jilin Agricultural University | 2009
Cheng Hao; Qi Xiaohui; Yan Jianfang; Yu Jicheng; Liu Qiu; Liu ZhiHeng