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Dive into the research topics where Yu Jicheng is active.

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Featured researches published by Yu Jicheng.


international conference on new technology of agricultural engineering | 2011

Multiresidue method for the analysis of pesticide residues in leafy vegetables by supercritical fluid extraction and capilary gas chromatography

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

Synthesis of artificial antigen and studied on influence factors of ELISA for chlorothalonil residue

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

Strain CS07 with oil degradation and coagulation properties and application of strain

Liu Qiu; Yu Jicheng; Chen Chao; Qi Xiaohui


Archive | 2015

Bacterium AH07 with petroleum degradation function, use of bacterium AH07, and submarine sedimentation petroleum degrading bacterial agent

Liu Qiu; Yu Jicheng; Pan Junhua; Liu Changjian


Archive | 2015

Bacterium AJ07 having petroleum degradation function, use thereof, and seabed settlement petroleum degradation bacterium agent

Yu Jicheng; Liu Qiu; Yan Jianfang; Pan Junhua


Archive | 2015

Bacteria WY-4B having petroleum agglomeration function and uses thereof, and bacteria vector

Liu Qiu; Yu Jicheng; Pan Junhua; Qi Xiaohui; Song Yanchao


Archive | 2015

Low-temperature bacterium BW02 with petroleum degradation function, purpose thereof and seafloor sediment petroleum degradation bacterium agents

Liu Qiu; Yu Jicheng; Pan Junhua; Yan Jianfang


Archive | 2015

Bacterium AW25 with petroleum degradation function, application thereof and bacterial vector

Yu Jicheng; Liu Qiu; Qi Xiaohui; Pan Junhua


Archive | 2015

Seabed sedimentation oil decomposing bactericide and preparation method thereof

Liu Qiu; Yu Jicheng; Pan Junhua; Liu Changjian


Journal of Jilin Agricultural University | 2009

Identification of ActinomycesA-10 against Fulvia fulva.

Cheng Hao; Qi Xiaohui; Yan Jianfang; Yu Jicheng; Liu Qiu; Liu ZhiHeng

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Liu Qiu

Dalian Nationalities University

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Qi Xiaohui

Dalian Nationalities University

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Guo Nai-fei

Shenyang Agricultural University

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Guo Naifei

Dalian Nationalities University

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Ji Shujuan

Shenyang Agricultural University

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