Elimination of the artefact peaks in capillary electrophoresis determination of glutamate by using organic solvents in sample preparation

2015 ◽  
Vol 38 (21) ◽  
pp. 3781-3787 ◽  
Author(s):  
Camila Dalben Madeira Campos ◽  
Patricia Aparecida deCampos Braga ◽  
Felix Guillermo Reyes Reyes ◽  
José Alberto Fracassi daSilva
Keyword(s):  
Capillary Electrophoresis ◽  
Sample Preparation ◽  
Organic Solvents

scholarly journals Advances in the Detection of Dithiocarbamate Fungicides: Opportunities for Biosensors

Biosensors ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 12
Author(s):  
Pablo Fanjul-Bolado ◽  
Ronen Fogel ◽  
Janice Limson ◽  
Cristina Purcarea ◽  
Alina Vasilescu
Keyword(s):  
Raman Spectroscopy ◽  
Sample Preparation ◽  
Organic Solvents ◽  
Ornamental Plants ◽  
Fungal Diseases ◽  
Analytical Determination ◽  
Solubility In Water ◽  
Analytical Tools ◽  
Low Solubility

Dithiocarbamate fungicides (DTFs) are widely used to control various fungal diseases in crops and ornamental plants. Maximum residual limits in the order of ppb-ppm are currently imposed by legislation to prevent toxicity problems associated with excessive use of DTFs. The specific analytical determination of DTFs is complicated by their low solubility in water and organic solvents. This review summarizes the current analytical procedures used for the analysis of DTF, including chromatography, spectroscopy, and sensor-based methods and discusses the challenges related to selectivity, sensitivity, and sample preparation. Biosensors based on enzymatic inhibition demonstrated potential as analytical tools for DTFs and warrant further research, considering novel enzymes from extremophilic sources. Meanwhile, Raman spectroscopy and various sensors appear very promising, provided the selectivity issues are solved.

UNTERSUCHUNGEN ÜBER DIE EXTRAKTION DES ROTEN KOBER-FARBSTOFFS DURCH ORGANISCHE LÖSUNGSMITTEL ZUR ÖSTROGENBESTIMMUNG IM HARN

1960 ◽  
Vol XXXV (I) ◽  
pp. 34-48 ◽  
Author(s):  
Gerd Ittrich
Keyword(s):  
Menstrual Cycle ◽  
Organic Solvents ◽  
Urine Sample ◽  
Phenol Derivatives ◽  
Organische Lösungsmittel ◽  
Colour Complex

ABSTRACT A series of organic solvents and phenol derivatives have been examined for the extraction of the pink Kober-colour complex. Optimal results could be achieved for fluorimetry by a solution of 2 % (w/v) p-nitrophenol and 1 % (v/v) ethanol in acetylenetetrabromide, when the green mercury line (546 mμ was used as primary light. The sensitivity, stability and specificity have been improved, compared with the previously described reaction. By changing the sequence of purification steps and by reducing the volume of the urine sample (5 ml) the method for the determination of total oestrogens has been simplified. Approximately 10 determinations can be done within 3–4 hours by one person. Recovery experiments and comparative determinations with a previously described method have been carried out. The excretion of total oestrogens in a complete menstrual cycle is determined with the described method.

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