dosagem espectrométrica de metaemoglobina sem interferentes químicos ou enzimáticos spectrometric measurement of methemoglobin without interference of chemical or enzymatic reagents
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ID: 254209
2004
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Abstract
Os autores apresentam uma nova técnica para dosagem de metaemoglobina em relação à oxiemoglobina, sem interferentes químicos ou enzimáticos. A base metodológica da técnica proposta se fundamenta nos valores reais de metaemoglobina circulante no sangue. Para a determinação quantitativa da metaemoglobina em relação à oxiemoglobina circulantes procedeu-se à hemólise do sangue total e à estabilização desses dois produtos em tampão fosfato M/60 (ou 60 mol L-1) pH 6,8. Os valores de metaemoglobina e oxiemoglobina foram obtidos de suas absorções espectrofotométricas em 630 nm e 540 nm. A técnica proposta foi comparada com a de Evelyn e Malloy, cuja metodologia avalia subprodutos heme-estruturais de hemoglobinas tratados com soluções de ferricianeto e cianeto de potássio. A presente técnica tem a vantagem de dispensar interferentes químicos ou enzimáticos, sem risco tóxico. Os valores obtidos da padronização revelaram que o grau de normalidade variou entre 1,9% e 3,8%.
The authors introduce a new technique to measure the methemoglobin in relationship to oxyhemoglobin, without interference of chemical reagents or enzymes. The methodical basis sets out to detect real values of methemoglobin in the blood. To determine the level of methemoglobin in relationship of oxyhemoglobin, the blood was hemolysed and the hemoglobins (metha and oxy) were stabilized in a phosphate buffer M/60 (or 60 mol L-1) pH 6.8. The levels of methemoglobin and oxyhemoglobin were obtained by spectrophotometric absorption at 630nm and 540nm. This technique was compared with the technique of Evelyn and Malloy, whose methodology measures the heme-structural subproducts of hemoglobin treated with potassium ferricyanide and cyanide solutions. This technique has the advantage of removing the interference of chemical reagents or enzymes without toxic risks. The values obtained with this standardization showed that the normal levels range between 1.9% and 3.8%.
The authors introduce a new technique to measure the methemoglobin in relationship to oxyhemoglobin, without interference of chemical reagents or enzymes. The methodical basis sets out to detect real values of methemoglobin in the blood. To determine the level of methemoglobin in relationship of oxyhemoglobin, the blood was hemolysed and the hemoglobins (metha and oxy) were stabilized in a phosphate buffer M/60 (or 60 mol L-1) pH 6.8. The levels of methemoglobin and oxyhemoglobin were obtained by spectrophotometric absorption at 630nm and 540nm. This technique was compared with the technique of Evelyn and Malloy, whose methodology measures the heme-structural subproducts of hemoglobin treated with potassium ferricyanide and cyanide solutions. This technique has the advantage of removing the interference of chemical reagents or enzymes without toxic risks. The values obtained with this standardization showed that the normal levels range between 1.9% and 3.8%.
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| Authors | ;Paulo Cesar Naoum;Janaína Radispiel;Magaly da Silva Moraes |
| Journal | journal of computational and graphical statistics : a joint publication of american statistical association, institute of mathematical statistics, interface foundation of north america |
| Year | 2004 |
| DOI |
10.1590/S1516-84842004000100004
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