HPTLC determination of imidacloprid, fenitrothion and parathion in Chinese cabbage

2005 ◽  
Vol 18 (102) ◽  
pp. 151-154 ◽  
Author(s):  
Haiqun Cao ◽  
Yongde Yue ◽  
Rimao Hua ◽  
Feng Tang ◽  
Rong Zhang ◽  
...  
Keyword(s):  
Chinese Cabbage

Determination of Streptomycin Residue in Cucumber and Chinese Cabbage by High-Performance Liquid Chromatography with Postcolumn Derivatization and Fluorometric Detection

2012 ◽  
Vol 95 (2) ◽  
pp. 523-527 ◽  
Author(s):  
Benjing Chen ◽  
Hongyan Zhang ◽  
Baoxiang Lin ◽  
Jing Ge ◽  
Lihong Qiu
Keyword(s):  
Chinese Cabbage ◽  
High Performance ◽  
Accurate Method ◽  
Excitation Wavelength ◽  
Fluorometric Detection ◽  
Mixed Solution ◽  
Fluorescence Detector ◽  
Precision And Accuracy ◽  
Postcolumn Derivatization

Abstract A sensitive and accurate method was developed for the determination of streptomycin using HPLC followed by postcolumn derivatization and fluorometric detection. The analyte was extracted, using aqueous solution from cucumber and Chinese cabbage, by a two-step SPE procedure. The extraction, cleanup, and chromatography conditions were optimized, and the performance of the analysis method was evaluated. The conditions of chromatography were as follows: the separation was performed on a C18 column; the isocratic mobile phase consisted of acetonitrile and a mixed solution containing 10 mM sodium 1,2-naphthoquinone-4-sulfonate and 0.4 mM sodium 1-heptanesulfonate (25 + 75, v/v); and the flow rate was 1 mL/min. The fluorescence detector was set at an excitation wavelength of 263 nm and an emission wavelength of 435 nm. The calibration curve was linear over the range of 50–2000 ng/mL, with a correlation coefficient of 0.9995. The LOD and LOQ were 10 and 30 ng/g, respectively, in both cucumber and Chinese cabbage. The method was validated for selectivity, linearity, precision, and accuracy. The intraday and interday precision and accuracy were within 10%. The mean recoveries from spiked samples were more than 75%, with RSD lower than 10%.

Determination of Imidacloprid Residues in Chinese Cabbage by UPLC-MS/MS

2014 ◽  
Vol 852 ◽  
pp. 274-277
Author(s):  
Yu Bing Zha ◽  
Mao Fang Huang ◽  
Chun Liang Yang ◽  
Ming Yue Wang ◽  
Xiao Fang Wang ◽  
...  
Keyword(s):  
Chinese Cabbage ◽  
Linear Correlation ◽  
Good Linear ◽  
Calibration Curves ◽  
Relative Standard ◽  
External Standard ◽  
Standard Calibration ◽  
Standard Deviations ◽  
Good Linear Correlation

A method for determination of imidacloprid in Chinese Cabbage was established by using UPLCMS/MS. and the samples are extracted with acetontrile,and the extract is cleaned up by Florisil SPE cartridges and evaporated.Choromatographic separation was performed on a C18 column,and determined by UPLC-MS/MS.The external standard calibration curves were used for quantification. The results showed that a good linear correlation was obtained in the range of 0.005-0.1ug/mL. The limit of quantif icat ion w as 0. 008 mg/ kg .The average recoveries and the relative standard deviations were in the range of 84.9 %~92.7 % and 0.9 %~6.2 %, respectively. It is applicable to the determination of imidacloprid redidue in Chinese cabbage.

scholarly journals Direct Determination of Atrazine Residue on Chinese Cabbage Leaf Using Desorption Electrospray Ionization-Tandem Mass Spectrometry and Its Application for Diagnosing Atrazine Drift Phytotoxicity

2009 ◽  
Vol 92 (5) ◽  
pp. 1587-1592 ◽  
Author(s):  
Xin-Zhong Zhang ◽  
Chong-Jiu Li ◽  
Shan-Shan Chen ◽  
Xiao-Juan Li ◽  
Hao Han ◽  
...  
Keyword(s):  
Electrospray Ionization ◽  
Chinese Cabbage ◽  
Good Accuracy ◽  
Ion Trap ◽  
Desorption Electrospray Ionization ◽  
Direct Determination ◽  
Surface Concentration ◽  
Relationship Of ◽  
Average Peak Area

Abstract A method was developed for the determination of atrazine residue and phytotoxicity on a nontargeted plant, the Chinese cabbage. The analysis was done by desorption electrospray ionization combined with ion trap MS/MS. Within the range of 63.13 to 2525 pg/mm2 of atrazine on the specimen, the linear relationship of the average peak area of extracted product ion m/z 174 (y) versus the surface concentration of atrazine (x) was estimated as y 5066.5x 85779; r was 0.9994, with RSD between 3.37 and 26.17. The LOQ of atrazine on the leaf surface was lower than 63.13 pg/mm2. The method is highly applicable to detect atrazine residue and evaluate atrazine phytotoxicity on Chinese cabbage leaf with good accuracy, selectivity, sensitivity, and specificity.

Development and Validation of an UV-Visible Method for the Determination of β-Carotene in the Leafy Vegetables in Thailand

2014 ◽  
Vol 1033-1034 ◽  
pp. 652-657
Author(s):  
Napaporn Rattanat ◽  
Kanjana Yodmora
Keyword(s):  
Chinese Cabbage ◽  
Storage Temperature ◽  
Morning Glory ◽  
Leafy Vegetables ◽  
Limit Of Quantification ◽  
Carotene Content ◽  
Relative Standard ◽  
Uv Visible ◽  
Β Carotene

Determination of β-carotene content in four types of leafy vegetables, water morning glory, kale, lettuce and Chinese cabbage by using a simple, rapid and low cost of UV-Visible method. This study was in the concentration range of 0.5 to 12 mg/L, and showed the linear regression equation y = 0.0764x - 0.0008, and an excellent linearity with correlation coefficient (R2) was 0.9999. The accuracy of the method analysis was reported by percentage recovery of about 80-106%. The precision was reported by percent of relative standard deviation and varies for intra-day 3.92% and inter-day 3.99%. The limits of detection and limit of quantification were 0.004 and 0.013 mg/L, respectively. Acetone is the most suitable for extraction, ratio of weight of samples to solvent, and extraction time was 1:3 g/mL and 10 min. Moreover, the most appropriate storage temperature for leafy vegetable samples is 4°C. Evaluation of β-carotene content under the suitable conditions in the kale, Chinese cabbage, lettuce and water morning glory was found to be 27.96 ± 2.99, 19.35 ± 1.92, 18.78 ± 0.88 and 18.48 ± 1.86 mg/100 g, respectively.

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