Sample preparation method with ultrafiltration for whole blood thiosulfate measurement
| Autor: | Manabu Murakami, Shigeki Jin, Michitaka Ozaki, Tomoko Matoba, Sanae Haga, Akiko Takeuchi, Hideki Hyodoh, Kotaro Matoba |
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| Rok vydání: | 2020 |
| Předmět: |
Thiosulfate
Chromatography Calibration curve Thiosulfates Ultrafiltration Water Standard solution Pathology and Forensic Medicine Specimen Handling Solvent Solutions Issues ethics and legal aspects chemistry.chemical_compound Forensic Toxicology chemistry Liquid chromatography–mass spectrometry Refrigeration Calibration Humans Sample preparation Hydrogen Sulfide Quantitative analysis (chemistry) Whole blood |
| Zdroj: | Legal medicine (Tokyo, Japan). 47 |
| ISSN: | 1873-4162 |
| Popis: | Quantitative analysis of thiosulfate is useful for diagnosing hydrogen sulfide poisoning. Liquid chromatography-tandem mass spectrometry (LC–MS/MS) enables more rapid and sensitive measurements than previous methodologies. As simple measurements of blood thiosulfate concentration are affected by the blood matrix, blood is used as the solvent to prepare the standard solution for calibration curve generation. Thus, a large amount of blood devoid of thiosulfate is required. We developed a preparation method by incorporating an ultrafiltration step to overcome this limitation and generate a calibration curve using a standard solution prepared with pure water. We used this improved method to investigate the stability of thiosulfate in refrigerated samples. To compare the effects of refrigeration, blood samples were prepared using the following two methods: one sample was treated with a 50-kDa exclusion ultrafiltration membrane and the other was not treated. The samples were stored at 4 °C, and then measured at 0, 3, 6, 24, 48, and 96 h. The incorporation of the ultrafiltration step in the measurement procedure enabled the quantification of thiosulfate, by plotting a calibration curve using a standard of pure water; it did not require a blood standard. Additionally, the reduction in whole blood thiosulfate concentration was within 10% during 2 days of refrigeration. Thus, the need for a large amount of blood to prepare the standard solution was resolved by the ultrafiltration step in test sample preparation. This method is useful to measure thiosulfate concentration and is not hindered by sample refrigeration for a few days. |
| Databáze: | OpenAIRE |
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