Determination of herbicides paraquat, glyphosate, and aminomethylphosphonic acid in marijuana samples by capillary electrophoresis. 2015

Rafael Lanaro, and José L Costa, and Silvia O S Cazenave, and Luiz A Zanolli-Filho, and Marina F M Tavares, and Alice A M Chasin
Poison Control Center, State University of Campinas, Campinas, SP, 13083-887, Brazil.

In this work, two methods were developed to determine herbicides paraquat, glyphosate, and aminomethylphosphonic acid (AMPA) in marijuana samples by capillary electrophoresis. For paraquat analysis, sample was extracted with aqueous acetic acid solution and analyzed by capillary zone electrophoresis with direct UV detection. The running electrolyte was 50 mmol/L phosphate buffer (pH 2.50). For glyphosate and AMPA, indirect UV/VIS detection was used, as these substances do not present chromophoric groups. Samples were extracted with 5 mmol/L hydrochloric acid. The running electrolyte was 10 mmol/L gallic acid, 6 mmol/L TRIS, and 0.1 mmol/L CTAB (pH = 4.7). The methods presented good linearity, precision, accuracy, and recovery. Paraquat was detected in 12 samples (n = 130), ranging from 0.01 to 25.1 mg/g. Three samples were positive for glyphosate (0.15-0.75 mg/g), and one sample presented AMPA as well. Experimental studies are suggested to evaluate the risks of these concentrations to marijuana user.

UI MeSH Term Description Entries
D007555 Isoxazoles Azoles with an OXYGEN and a NITROGEN next to each other at the 1,2 positions, in contrast to OXAZOLES that have nitrogens at the 1,3 positions. Isoxazole
D010269 Paraquat A poisonous dipyridilium compound used as contact herbicide. Contact with concentrated solutions causes irritation of the skin, cracking and shedding of the nails, and delayed healing of cuts and wounds. Methyl Viologen,Gramoxone,Paragreen A,Viologen, Methyl
D002188 Cannabis The plant genus in the Cannabaceae plant family, Urticales order, Hamamelidae subclass. The flowering tops are called many slang terms including pot, marijuana, hashish, bhang, and ganja. The stem is an important source of hemp fiber. Bhang,Ganja,Hashish,Hemp,Cannabis indica,Cannabis sativa,Hemp Plant,Marihuana,Marijuana,Bhangs,Cannabi,Ganjas,Hashishs,Hemp Plants,Hemps,Plant, Hemp,Plants, Hemp
D004340 Drug Contamination The presence of organisms, or any foreign material that makes a drug preparation impure. Drug Adulteration,Drug Contamination, Chemical,Drug Contamination, Microbial,Drug Contamination, Physical,Drug Impurity,Adulteration, Drug,Chemical Drug Contamination,Chemical Drug Contaminations,Contamination, Chemical Drug,Contamination, Drug,Contamination, Microbial Drug,Contamination, Physical Drug,Contaminations, Chemical Drug,Contaminations, Microbial Drug,Contaminations, Physical Drug,Drug Adulterations,Drug Contaminations,Drug Contaminations, Chemical,Drug Contaminations, Microbial,Drug Contaminations, Physical,Drug Impurities,Impurity, Drug,Microbial Drug Contamination,Microbial Drug Contaminations,Physical Drug Contamination,Physical Drug Contaminations
D005998 Glycine A non-essential amino acid. It is found primarily in gelatin and silk fibroin and used therapeutically as a nutrient. It is also a fast inhibitory neurotransmitter. Aminoacetic Acid,Glycine, Monopotassium Salt,Glycine Carbonate (1:1), Monosodium Salt,Glycine Carbonate (2:1), Monolithium Salt,Glycine Carbonate (2:1), Monopotassium Salt,Glycine Carbonate (2:1), Monosodium Salt,Glycine Hydrochloride,Glycine Hydrochloride (2:1),Glycine Phosphate,Glycine Phosphate (1:1),Glycine Sulfate (3:1),Glycine, Calcium Salt,Glycine, Calcium Salt (2:1),Glycine, Cobalt Salt,Glycine, Copper Salt,Glycine, Monoammonium Salt,Glycine, Monosodium Salt,Glycine, Sodium Hydrogen Carbonate,Acid, Aminoacetic,Calcium Salt Glycine,Cobalt Salt Glycine,Copper Salt Glycine,Hydrochloride, Glycine,Monoammonium Salt Glycine,Monopotassium Salt Glycine,Monosodium Salt Glycine,Phosphate, Glycine,Salt Glycine, Monoammonium,Salt Glycine, Monopotassium,Salt Glycine, Monosodium
D006540 Herbicides Pesticides used to destroy unwanted vegetation, especially various types of weeds, grasses (POACEAE), and woody plants. Some plants develop HERBICIDE RESISTANCE. Algaecide,Algicide,Herbicide,Algaecides,Algicides
D000097797 Glyphosate Active compound in herbicidal formulations that inhibits 3-PHOSPHOSHIKIMATE 1-CARBOXYVINYLTRANSFERASE. Gliphosate,Glyphosate Hydrochloride (2:1),Glyphosate, Calcium Salt,Glyphosate, Calcium Salt (1:1),Glyphosate, Copper (2+) Salt,Glyphosate, Dilithium Salt,Glyphosate, Disodium Salt,Glyphosate, Magnesium Salt,Glyphosate, Magnesium Salt (2:1),Glyphosate, Monoammonium Salt,Glyphosate, Monopotassium Salt,Glyphosate, Monosodium Salt,Glyphosate, Sodium Salt,Glyphosate, Zinc Salt,Yerbimat,Kalach 360 SL,N-(phosphonomethyl)glycine,Roundup
D013777 Tetrazoles
D019075 Electrophoresis, Capillary A highly-sensitive (in the picomolar range, which is 10,000-fold more sensitive than conventional electrophoresis) and efficient technique that allows separation of PROTEINS; NUCLEIC ACIDS; and CARBOHYDRATES. (Segen, Dictionary of Modern Medicine, 1992) Capillary Zone Electrophoresis,Capillary Electrophoreses,Capillary Electrophoresis,Capillary Zone Electrophoreses,Electrophoreses, Capillary,Electrophoreses, Capillary Zone,Electrophoresis, Capillary Zone,Zone Electrophoreses, Capillary,Zone Electrophoresis, Capillary
D063065 Organophosphonates Carbon-containing phosphonic acid compounds. Included under this heading are compounds that have carbon bound to either OXYGEN atom or the PHOSPHOROUS atom of the (P Phosphonate,Phosphonates,Phosphonic Acid Esters,Acid Esters, Phosphonic,Esters, Phosphonic Acid

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