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Voltammetric detection of LSD using a chemically modified carbon paste electrode with Schiff base
complex
Marcelo Firmino de Oliveira
Universidade de São PauloFaculdade de Filosofia Ciencias e Letras de Ribeirão Preto
Departamento de Química
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Class A Class B Class C
FTIR CE
Spot tests
MS GC fluorescence
H-RMN TLC
Immunological assay
Raman HPLC Melting point
Optical microscopy UV-Vis
Farmaceutical identifiers
Drug analysis by american CSIs and Brazilian Federal Police
A+A
A+B
A+C
B+B+B
B+B+C
PS: no electrochemical methods cited
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Cell, electrodes and expected results in voltammetry
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Cocaine
(SWV: LOD of 1nmol/L)
Example of electrochemical analysis in forensic chemistry:
V. Pavlova et al. / Analytica Chimica Acta 512 (2004) 49–56
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LSD
1938 – Dr. Albert Hofmann
Lysergic acid + diethylamided-LSD d-iso-LSD
l-iso-LSDl-LSDActuation: CNS
hallucinations; euphoria;panic; confusion;psychotic episodes.
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Schiff Bases: 1864 – Hugo Schiff Amine + Aldehyde/Ketone
applicability : antimicrobial Fungicide Herbicide Anticancer
Complexation with metallic centers: UO2
2+
Chemical modifierChemical modifier
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OBJECTIVES
Apply the complex [UO2(Ac-ophen)]·H2O as carbon paste electrode modifier;
Voltammetric detection and quantification of LSD.
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40%20%
40%
CV
SWV DPV KCl 0.1M
ExperimentalExperimental
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Standard addition – SWV
Frequency: 10 Hz
Amplitude: 800 mV
ResultsResults
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Standard addition - DPV
Amplitude: 800mV
pulse time: 40ms
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Voltammetric
technique
R2 SD
(μA)
m
(μA L μmol-1)
LOD
(μmol L-1)
LOQ
(μmol L-1)
SWV 0.992 1.79x10-2 1.75x10-1 0.31 1.02
DPV 0.984 2.63x10-2 1.52x10-1 0.52 1.73
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CONCLUSIONS
Thank you
Good stability for the proposed CM-CPE in water.
A new transductor for LSD analysis;
Detection and quantification of LSD μmol L-1 range;