The main urinary cocaine metabolites are benzoylecgonine and ecgonine methyl ester. These molecules possess two chemical functional groups that can be charged within the conventional pH range, this is the tertiary amine group (both) and the carboxylic group (benzoylecgonine). We have found that in the pH range from 2 to 6 (for benzoylecgonine) and pH from 2 to 4 (for ecgonine methyl ester) both molecules can be detected at the electrified liquid -liquid interface ( eLLI ) by following the interfacial ion transfer reactions triggered in the presence of the concerned metabolites in the aqueous phase. The presence of the benzene ring in the benzoylecgonine structure increases its hydrophobicity (on the formal Galvani potential difference scale) by around 200 mV as compared with ecgonine methyl ester which transfer is overlaid with the inorganic cations crossing the LLI at the positive end of the potential window. Macroscopic eLLI was used during physicochemical ecgonine methyl ester and benzoylecgonine characterization as we have defined their diffusion coefficients, ion partition, and concentration fraction diagrams (only for the latter). The miniaturized platform was used during electroanalytical studies focused on benzoylecgonine giving a few mu M limit of detection. For this purpose, we have used the fused silica capillary as the eLLI support. All our findings allowed us to use this system first to develop the electroanalytical protocol for benzoylecgonine quantification to finally detect it in the spiked urine sample with nearly 100 % recovery.
机构:
Univ Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
Aden Community Coll, Dept Comp Sci, Aden, YemenUniv Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
Al-Dhaqm, Arafat
Abd Razak, Shukor
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Univ Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, MalaysiaUniv Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
Abd Razak, Shukor
Ikuesan, Richard Adeyemi
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Community Coll Qatar, Sch Informat Technol, Dept Cyber & Networking Secur, Sci & Technol Div, Doha, QatarUniv Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
Ikuesan, Richard Adeyemi
Kebande, Victor R.
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Malmo Univ, Comp Sci & Media Technol Dept, S-21118 Malmo, SwedenUniv Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
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Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
Criminalist Inst Sao Paulo, Instrumental Anal Lab, Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
da Costa, Jose Luiz
Tonin, Fernando Gustavo
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Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
Tonin, Fernando Gustavo
Zanolli, Luiz Antonio
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Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
Zanolli, Luiz Antonio
da Matta Chasin, Alice Aparecida
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Univ Sao Paulo, Fac Pharmaceut Sci, BR-05508900 Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
da Matta Chasin, Alice Aparecida
Maggi Tavares, Marina Franco
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Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
机构:
Univ Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
Aden Community Coll, Dept Comp Sci, Aden, YemenUniv Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
Al-Dhaqm, Arafat
Abd Razak, Shukor
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h-index: 0
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Univ Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, MalaysiaUniv Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
Abd Razak, Shukor
Ikuesan, Richard Adeyemi
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h-index: 0
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Community Coll Qatar, Sch Informat Technol, Dept Cyber & Networking Secur, Sci & Technol Div, Doha, QatarUniv Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
Ikuesan, Richard Adeyemi
Kebande, Victor R.
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h-index: 0
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Malmo Univ, Comp Sci & Media Technol Dept, S-21118 Malmo, SwedenUniv Teknol Malaysia UTM, Sch Comp, Fac Engn, Skudai 81310, Malaysia
机构:
Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
Criminalist Inst Sao Paulo, Instrumental Anal Lab, Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
da Costa, Jose Luiz
Tonin, Fernando Gustavo
论文数: 0引用数: 0
h-index: 0
机构:
Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
Tonin, Fernando Gustavo
Zanolli, Luiz Antonio
论文数: 0引用数: 0
h-index: 0
机构:
Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
Zanolli, Luiz Antonio
da Matta Chasin, Alice Aparecida
论文数: 0引用数: 0
h-index: 0
机构:
Univ Sao Paulo, Fac Pharmaceut Sci, BR-05508900 Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil
da Matta Chasin, Alice Aparecida
Maggi Tavares, Marina Franco
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h-index: 0
机构:
Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, BrazilUniv Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, Brazil