Residue determination of organophosphorus pesticides in animal tissues by temperature programmed GC and TLC methods

1975 ◽  
Vol 274 (5) ◽  
pp. 371-373 ◽  
Author(s):  
A. Hladká ◽  
J. Kováč ◽  
V. Krampl
Keyword(s):  
Organophosphorus Pesticides ◽  
Animal Tissues ◽  
Residue Determination ◽  
Temperature Programmed

Simplified Extraction and Cleanup for Multiresidue Determination of Pesticides in Lanolin

1989 ◽  
Vol 72 (6) ◽  
pp. 991-993
Author(s):  
Henri Diserens
Keyword(s):  
Extraction Method ◽  
Diatomaceous Earth ◽  
Small Volume ◽  
Solid Phase ◽  
Organophosphorus Pesticides ◽  
Packed Column ◽  
Light Petroleum ◽  
Temperature Programmed ◽  
Multiresidue Determination

Abstract In the proposed method, a light petroleum solution of lanolin (wool fat) is adsorbed on diatomaceous earth in an Extrelut® column, and the pesticides are eluted with acetonitrile saturated with light petroleum. After evaporation to a small volume, the extract is subjected to solid-phase extraction (SPE) on a C-18 column. The acetonitrile eluate is evaporated to dryness and the residue is taken up in light petroleum. Organophosphorus pesticides are determined by temperature- programmed gas chromatography (GC) on a wide-bore column using a flame photometric detector in the phosphorus mode. Organochlorine pesticides are determined after miniaturized Florisil cleanup by classic GC on an OV-17/QF-1 packed column, using an electron capture detector. This procedure is more rapid and straightforward than the time-consuming AOAC extraction method, 29.014. Cleanup was better and the results obtained were comparable. Recoveries for 13 organochlorine and organophosphorus pesticides, frequently found in lanolin, ranged from 80 to 90%

Optimization of sol-gel based fibre-optic cholinesterase biosensor for the determination of organophosphorus pesticides

2000 ◽  
Vol 42 (7-8) ◽  
pp. 283-290 ◽  
Author(s):  
H.-C. Tsai ◽  
R.-A. Doong
Keyword(s):  
Fiber Optic ◽  
Ph Value ◽  
Rapid Determination ◽  
Organophosphorus Pesticides ◽  
Sol Gel ◽  
Neutral Red ◽  
Fluorescent Indicators ◽  
Low Leakage ◽  
Fiber Optic System

A sol-gel based fiber-optic biosensor with acetylcholinesterase as the biorecognition element has been developed for the rapid determination of organophosphorus pesticides. Nine fluorescent indicators, acridine, acridine orange, neutral red, DAPI, rhodamine B, fluorescein, umbelliferone, FITC on celite and FITC-dextran, have been examined to optimize the fiber-optic system. Results showed that acridine and FITCs were sensitive to the change of pH value caused by the enzyme-substrate catalysis reaction. However, the sensitivity of acridine was 260 times lower than that of FITCs. Higher toxicity of acridine to acetylcholinesterase than FITC was also observed. Moreover, the high-molecular-weight FITC-dextran showed low leakage rate when immobilizing using sol-gel technology, showing that the FITC-dextran was a suitable pH sensitive fluorescent indicator for the OPPs biosensor. The response of the fiber-optic biosensor to the substrate, acetylcholine, was highly reproducible (RSD=3.5%). A good linearity of acetylcholine in the range from 0.5 to 20 mM was also obtained (R2=0.98). Furthermore, a 30% inhibition can be achieved in 30min when 152 ppb paraoxon was added into the system. The results show the possibility for real-time determination of organophosphorus pesticides by using the biosensor developed in this study.

scholarly journals THE DETERMINATION OF LIPIDE INOSITOL IN ANIMAL TISSUES

1953 ◽  
Vol 201 (2) ◽  
pp. 609-613 ◽  
Author(s):  
Wanda E. Taylor ◽  
J.M. McKibbin
Keyword(s):  
Animal Tissues

scholarly journals DETERMINATION OF IODINE IN BLOOD AND IN ANIMAL TISSUES

1920 ◽  
Vol 43 (1) ◽  
pp. 161-170
Author(s):  
E.C. Kendall ◽  
F.S. Richardson
Keyword(s):  
Animal Tissues
Sign in / Sign up

Export Citation Format

Share Document