Yan Shen

Shanghai Municipal Center For Disease Control Prevention

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Chao Han

Zhejiang Shuren University

Ruixiang SHI

Guangdong Pharmaceutical University

Zhenou Zhu

Zhejiang Entry-Exit Inspection and Quarantine Bureau

Lijun Chen

Institute of Applied Ecology

Chuang LIU

Roche (Switzerland)

Xiujin Zhou

Zhoushan Hospital

Beizhen Hu

Entry Exit Inspection and Quarantine Bureau

Chaoqun Huang

Tianjin University

Zhijin Yang

Tianjin University

Chuang Liu

Northwestern Polytechnical University

Cooperative Institutions

Chinese Academy of Sciences

Jiangsu Academy of Agricultural Sciences

Ministry of Agriculture and Rural Affairs

Zhejiang University

University of Chinese Academy of Sciences

Zhejiang Entry-Exit Inspection and Quarantine Bureau

Nanjing Agricultural University

Central South University

Entry Exit Inspection and Quarantine Bureau

Sichuan University

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A Comparative Analysis of Beta-cypermethrin Nanoemulsion and Traditional Emulsion Dosages on Enzyme Activities in Blattella germanica

Heliyon (2024)

Yan Shen Qiong Li Fujin Fang Chuanli Yang Yu Dong

ObjectiveTo compare the impact of two pesticide dose forms on Blattella germanica (B. germanica)resistance enzymes.The micro-drop technique was utilized on subcultured B. germanica, and the metabolic enzyme activity was assessed.Using spectrophotometry, the relative enzyme activities of B.germanica were determined.Profile analysis was used to compare the enzyme activities of beta-cypermethrin in both nanoemulsion and traditional emulsion forms.Findings: The suppression percentages of the acetylcholinesterase enzyme (AchE), GST, and P450–O demethylases across different pesticide formulations were analyzed using regression equations, yielding F = 31.18, P < 0.001; F = 9.18, P < 0.001; and F = 4.58, P < 0.02.Conclusion: The suppression of AchE, GST, and P450–O demethylase by beta-cypermethrin nanoemulsion was more significant compared to the beta-cypermethrin emulsifiable concentrate.The study concluded that beta-cypermethrin nanoemulsion had a significant impact on insect detoxifying enzymes compared to beta-cypermethrin emulsifiable concentrate due to their numerous advantages.

Dose

10.1016/j.heliyon.2024.e36372

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Determination of Xinjunan pesticide residue in foodstuffs of plant origin by a modified QuEChERS method and ultra performance liquid chromatography-tandem mass spectrometry

LWT (2021)

Chao Han Beizhen Hu Shubing Chen Nan Wang Jianbo Hou

QuEChERS

Residue (chemistry)

10.1016/j.lwt.2021.112101

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Citations (36)

Assay of S-methylmethionine (SMM) in malt using NIR spectroscopy

Oxford University Press eBooks (1991)

Yan Shen Etienne Bodart J. P. Dufour

Abstract Lager malt with SMM (dimethylsulfide precursor) content of maximum 19 ppm (5 ppm DMS equivalent) is often asked by the breweries. However average concentrations range from 10 ppm SMM in kilned lager malt to more than 50 ppm in green malt. NIRS with its fast response time would be the ideal investigation method to follow SMM during kilning. Assays of SMM in freeze-dried germinating barley samples were carried out using the NIRS calibration (42 samples) and prediction (41 samples) methods with input data obtained from HPLC analysis. Correlation coefficients of 0.97 (S.E. = 1.81 ppm) and 0.84 (S.E. = 3.5 ppm) were obtained for the calibration and the prediction, respectively. The method has been evaluated to follow SMM evolution during kilning.

10.1093/oso/9780199632831.003.0060

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Determination of validamycin A in agricultural food samples by solid-phase extraction combined with liquid chromatography–atmospheric pressure chemical ionisation–tandem mass spectrometry

Food Chemistry (2014)

Chuanxian Wang Zhigang Zhang Yan Shen Zhengan Tian Dunming Xu

Atmospheric-pressure chemical ionization

Solid phase extraction

Bioanalysis

10.1016/j.foodchem.2014.07.145

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Citations (18)

Determination of meptyldinocap residues in vegetable and fruit by liquid chromatography-tandem mass spectrometry

Chinese Journal of Chromatography (2013)

Zhiyong Zhang Weili Shan Qiu Jian Lifang Duan Yan Shen

摘要: 建立了一种通过检测硝苯菌酯(2,4-dinitro-6-(1-methylheptyl) phenyl crotonate, 2,4-DNOPC)相应的水解产物2,4-二硝基-6-(1-甲基庚基)苯酚(2,4-dinitro-6-(1-methylheptyl) phenol, 2,4-DNOP)来测定蔬菜和水果中2,4-DNOPC残留量的液相色谱-电喷雾串联质谱(LC-ESI-MS/MS)检测方法。蔬菜和水果样品用丙酮-甲醇-盐酸的混合液进行液-液分配提取,在碱性条件下超声水解后再进行液-液分配提取,然后进行LC-MS/MS测定。2,4-DNOPC在6种蔬菜和水果中的回收率试验结果表明,2,4-DNOPC在甘蓝中的添加回收率为89.7%~93.3%,相对标准偏差(RSD)为6.3%~8.5%;在黄瓜中的添加回收率为87.7%~95.1%, RSD为5.8%~10.4%;在番茄中的添加回收率为89.3%~96.0%, RSD为6.8%~9.2%;在苹果中的添加回收率为92.0%~98.3%, RSD为5.1%~10.3%;在梨中的添加回收率为89.0%~95.0%, RSD为5.3%~10.2%;在葡萄中的添加回收率为81.2%~95.8%, RSD为5.8%~10.4%。2,4-DNOPC在6种蔬菜和水果的最低检测浓度均为0.01 mg/kg。该检测方法样品前处理简单、快速,分析时间短,灵敏度、准确度和精密度均符合农药残留检测要求,适用于蔬菜和水果中硝苯菌酯残留量的检测。

Tandem

10.3724/sp.j.1123.2012.06008

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Determination of three capsaicinoids in Capsicum annuum by pressurized liquid extraction combined with LC‐MS/MS

Journal of Separation Science (2012)

Aili Liu Chao Han Xiujin Zhou Zhenou Zhu Fuzhen Huang

A new method based on pressurized liquid extraction followed by LC-MS/MS analysis has been developed for the identification and quantification of three capsaicinoids (capsaicin, dihydrocapsaicin, and nordihydrocapsaicin) in extracts of Capsicum annuum. For the recovery of three capsaicinoids, the efficiency levels of ultrasonic-assisted extraction, microwave-assisted extraction, Soxhlet extraction, and pressurized liquid extraction were compared under different conditions. Pressurized liquid extraction resulted in higher yields. Pressurized liquid extractions were performed using methanol; temperature was set at 100°C and pressure at 1500 psi. LC analysis was performed on a Waters XBridge™ C18 column (150 × 2.1 mm, id 3.5 μm) eluted by a mobile phase of 0.1% formic acid and ACN. Data acquisition was carried out in multiple reaction monitoring transitions mode, monitoring two-reaction monitoring transitions to ensure an accurate identification of target compounds in the samples. The proposed method is rapid, simple, and could be utilized for the routine analysis of three capsaicinoids in C. annuum samples.

10.1002/jssc.201200942

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Citations (22)

Effects of Different Nitrogen Rates on the Flavor Components and Sensory Evaluation of Oriental Tobacco Leaves

Zhongguo yancao kexue (2012)

Yan Shen

A Field experiment was conducted to studied the effects of different nitrogen rates on the flavor components and sensory evaluation under common practice using a oriental tobacco cultivar yunxiang basma 1 in Panzhihua.The results showed that,with inorganic nitrogen fertilizer rates increased,organic acids in tobaco leaves decreased,but cembranoids,carotenoids and total flavor components increased,and the highest contents were observed with nitrogen rate of 82.5 kg/ha.Labdanums and degradation product contents were the highest with nitrogen rate of 67.5 kg/ha.Total score of sensory evaluation increased with nitrogen rate and the highest when nitrogen rate was 82.5 kg/ha.

Tobacco leaf

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Determination of chlordimeform and its metabolite residue in milk by gas chromatography–tandem mass spectrometry

Food Research International (2024)

Yunxiao Wei Chaoqun Huang Li Chen Qinke Chen Jianbo Hou

Residue (chemistry)

10.1016/j.foodres.2024.114754

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Access and countermeasure to improve coal washing efficiency of Matou Coal Preparation Plant

Coal science and technology (2007)

Yan Shen

Countermeasure

Coal preparation plant

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Study on tissue culture and physiological and biochemical characteristics of oil palm.

Guangdong nongye kexue (2012)

Yan Shen Wang YeTong Hongxing Cao Weijun Chen Xintao Lei

Taking the callus of oil palm as the tested material,this article studied the dynamic changes of its soluble protein content and peroxidase(POD) activity in the process of callus formation,as well as the changes of its physiological and biochemical indexes before and after browning.The results showed that the callus of oil palm formed slowly,the POD activity showed a declining trend along with the prolonging of the time,the soluble sugar content increased first and then decreased,and the conductivity was stable.Meantime,the browning had significant influence on the callus activity of oil palm.

Callus

Browning

Elaeis guineensis

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