Single gas chromatography method with nitrogen phosphorus detector for urinary cotinine determination in passive and active smokers
Nicotine is a major addictive compound in cigarettes and is rapidly and extensively metabolized to several metabolites in humans, including urinary cotinine, considered a biomarker due to its high concentration compared to other metabolites. The aim of this study was to develop a single method for d...
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| Format: | Article |
| Language: | English |
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Universidade de São Paulo
2010-12-01
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| Series: | Brazilian Journal of Pharmaceutical Sciences |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502010000400019 |
| _version_ | 1811273602337603584 |
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| author | Lusiane Malafatti Patrícia Penido Maia Matheus Coutinho Gonçalves Martins Maria Elisa Pereira Bastos de Siqueira Isarita Martins |
| author_facet | Lusiane Malafatti Patrícia Penido Maia Matheus Coutinho Gonçalves Martins Maria Elisa Pereira Bastos de Siqueira Isarita Martins |
| author_sort | Lusiane Malafatti |
| collection | DOAJ |
| description | Nicotine is a major addictive compound in cigarettes and is rapidly and extensively metabolized to several metabolites in humans, including urinary cotinine, considered a biomarker due to its high concentration compared to other metabolites. The aim of this study was to develop a single method for determination of urinary cotinine, in active and passive smokers, by gas chromatography with a nitrogen phosphorus detector (GC-NPD). Urine (5.0 mL) was extracted with 1.0 mL of sodium hydroxide 5 mol L-1, 5.0 mL of chloroform, and lidocaine used as the internal standard. Injection volume was 1 μL in GC-NPD. Limit of quantification was 10 ng mL-1. Linearity was evaluated in the ranges 10-1000 ng mL-1 and 500-6000 ng mL-1, with determination coefficients of 0.9986 and 0.9952, respectively. Intra- and inter-assay standard relative deviations were lower than 14.2 %, while inaccuracy (bias) was less than +11.9%. The efficiency of extraction was greater than 88.5%. Ruggedness was verified, according to Youden's test. Means of cotinine concentrations observed were 2,980 ng mL-1 for active smokers and 132 ng mL-1, for passive smokers. The results revealed that satisfactory chromatographic separation between the analyte and interferents was obtained with a ZB-1 column. This method is reliable, precise, linear and presented ruggedness in the range evaluated. The results suggest that it can be applied in routine analysis for passive and active smokers, since it is able to quantify a wide range of cotinine concentrations in urine.<br>A nicotina é uma substância presente no cigarro capaz de causar dependência, sendo biotransformada em vários metabólitos nos seres humanos, dentre eles a cotinina urinária, que é considerada um indicador biológico de exposição à nicotina, devido a suas altas concentrações, comparado a outras matrizes. Assim, o objetivo deste estudo foi desenvolver um único método para determinação de cotinina urinária, em amostras de urina de fumantes ativos e passivos, através de cromatografia em fase gasosa com detector de nitrogênio- fósforo (CG-DNF). Para o preparo de amostras foram utilizados 5 mL de urina, 1 mL de hidróxido de sódio 5 mol L-1, 5 mL de clorofórmio, tendo como padrão interno a lidocaína. Na faixa de concentrações de 10-1000 ng mL-1 e 500- 6000 ng mL-1, o coeficiente de determinação foi 0,9986 e 0,9952, respectivamente e, o limite de quantificação foi 10 ng mL-1. A precisão intra- e interensaio apresentou desvio padrão relativo (%) menor que 14,2% e a inexatidão foi menor que +11,9%, com uma eficiência de extração de 88,5%. O método apresentou robustez, de acordo com o teste de Youden. As concentrações médias de cotinina observadas foram 2980 ng mL-1, para fumantes ativos e 132 ng mL-1, para fumantes passivos. Os resultados sugerem que o método é confiável, preciso, linear e apresentou robustez, na faixa avaliada, podendo ser aplicado na rotina para análises de amostras de fumantes ativos e passivos, pois é capaz de quantificar uma ampla faixa de concentrações de cotinina urinária. |
| first_indexed | 2024-04-12T23:02:13Z |
| format | Article |
| id | doaj.art-35acf56b754046a18427bda8088b1ba0 |
| institution | Directory Open Access Journal |
| issn | 1984-8250 2175-9790 |
| language | English |
| last_indexed | 2024-04-12T23:02:13Z |
| publishDate | 2010-12-01 |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Brazilian Journal of Pharmaceutical Sciences |
| spelling | doaj.art-35acf56b754046a18427bda8088b1ba02022-12-22T03:13:02ZengUniversidade de São PauloBrazilian Journal of Pharmaceutical Sciences1984-82502175-97902010-12-0146476977610.1590/S1984-82502010000400019Single gas chromatography method with nitrogen phosphorus detector for urinary cotinine determination in passive and active smokersLusiane MalafattiPatrícia Penido MaiaMatheus Coutinho Gonçalves MartinsMaria Elisa Pereira Bastos de SiqueiraIsarita MartinsNicotine is a major addictive compound in cigarettes and is rapidly and extensively metabolized to several metabolites in humans, including urinary cotinine, considered a biomarker due to its high concentration compared to other metabolites. The aim of this study was to develop a single method for determination of urinary cotinine, in active and passive smokers, by gas chromatography with a nitrogen phosphorus detector (GC-NPD). Urine (5.0 mL) was extracted with 1.0 mL of sodium hydroxide 5 mol L-1, 5.0 mL of chloroform, and lidocaine used as the internal standard. Injection volume was 1 μL in GC-NPD. Limit of quantification was 10 ng mL-1. Linearity was evaluated in the ranges 10-1000 ng mL-1 and 500-6000 ng mL-1, with determination coefficients of 0.9986 and 0.9952, respectively. Intra- and inter-assay standard relative deviations were lower than 14.2 %, while inaccuracy (bias) was less than +11.9%. The efficiency of extraction was greater than 88.5%. Ruggedness was verified, according to Youden's test. Means of cotinine concentrations observed were 2,980 ng mL-1 for active smokers and 132 ng mL-1, for passive smokers. The results revealed that satisfactory chromatographic separation between the analyte and interferents was obtained with a ZB-1 column. This method is reliable, precise, linear and presented ruggedness in the range evaluated. The results suggest that it can be applied in routine analysis for passive and active smokers, since it is able to quantify a wide range of cotinine concentrations in urine.<br>A nicotina é uma substância presente no cigarro capaz de causar dependência, sendo biotransformada em vários metabólitos nos seres humanos, dentre eles a cotinina urinária, que é considerada um indicador biológico de exposição à nicotina, devido a suas altas concentrações, comparado a outras matrizes. Assim, o objetivo deste estudo foi desenvolver um único método para determinação de cotinina urinária, em amostras de urina de fumantes ativos e passivos, através de cromatografia em fase gasosa com detector de nitrogênio- fósforo (CG-DNF). Para o preparo de amostras foram utilizados 5 mL de urina, 1 mL de hidróxido de sódio 5 mol L-1, 5 mL de clorofórmio, tendo como padrão interno a lidocaína. Na faixa de concentrações de 10-1000 ng mL-1 e 500- 6000 ng mL-1, o coeficiente de determinação foi 0,9986 e 0,9952, respectivamente e, o limite de quantificação foi 10 ng mL-1. A precisão intra- e interensaio apresentou desvio padrão relativo (%) menor que 14,2% e a inexatidão foi menor que +11,9%, com uma eficiência de extração de 88,5%. O método apresentou robustez, de acordo com o teste de Youden. As concentrações médias de cotinina observadas foram 2980 ng mL-1, para fumantes ativos e 132 ng mL-1, para fumantes passivos. Os resultados sugerem que o método é confiável, preciso, linear e apresentou robustez, na faixa avaliada, podendo ser aplicado na rotina para análises de amostras de fumantes ativos e passivos, pois é capaz de quantificar uma ampla faixa de concentrações de cotinina urinária.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502010000400019Cromatografia em fase gasosaCromatografia em fase gasosaCotinina urináriaUrinaFumantesGas chromatographyUrinary cotinineUrineSmokers |
| spellingShingle | Lusiane Malafatti Patrícia Penido Maia Matheus Coutinho Gonçalves Martins Maria Elisa Pereira Bastos de Siqueira Isarita Martins Single gas chromatography method with nitrogen phosphorus detector for urinary cotinine determination in passive and active smokers Brazilian Journal of Pharmaceutical Sciences Cromatografia em fase gasosa Cromatografia em fase gasosa Cotinina urinária Urina Fumantes Gas chromatography Urinary cotinine Urine Smokers |
| title | Single gas chromatography method with nitrogen phosphorus detector for urinary cotinine determination in passive and active smokers |
| title_full | Single gas chromatography method with nitrogen phosphorus detector for urinary cotinine determination in passive and active smokers |
| title_fullStr | Single gas chromatography method with nitrogen phosphorus detector for urinary cotinine determination in passive and active smokers |
| title_full_unstemmed | Single gas chromatography method with nitrogen phosphorus detector for urinary cotinine determination in passive and active smokers |
| title_short | Single gas chromatography method with nitrogen phosphorus detector for urinary cotinine determination in passive and active smokers |
| title_sort | single gas chromatography method with nitrogen phosphorus detector for urinary cotinine determination in passive and active smokers |
| topic | Cromatografia em fase gasosa Cromatografia em fase gasosa Cotinina urinária Urina Fumantes Gas chromatography Urinary cotinine Urine Smokers |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502010000400019 |
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