An improved method for measuring catalase activity in biological samples.

Autor: Hadwan MH; Department of Chemistry, College of Science, University of Babylon, Hilla 51002, Iraq., Hussein MJ; Department of Chemistry, College of Science, University of Babylon, Hilla 51002, Iraq., Mohammed RM; Department of Medical Physics, University of Al-Mustaqbal, Hilla 51001, Iraq., Hadwan AM; Faculty of Natural Sciences, University of Tabriz, Tabriz, po 5166616471, Iran.; Al-Manara College for Medical Sciencespo Al-Amarah 62001, Iraq., Saad Al-Kawaz H; Department of Medical Laboratories Techniques, University of Al-Mustaqbal, Hilla 51001, Iraq., Al-Obaidy SSM; Department of Chemistry, College of Science, University of Babylon, Hilla 51002, Iraq., Al Talebi ZA; Department of Chemistry, College of Science, University of Babylon, Hilla 51002, Iraq.
Jazyk: angličtina
Zdroj: Biology methods & protocols [Biol Methods Protoc] 2024 Mar 05; Vol. 9 (1), pp. bpae015. Date of Electronic Publication: 2024 Mar 05 (Print Publication: 2024).
DOI: 10.1093/biomethods/bpae015
Abstrakt: Catalase (CAT) is an important enzyme that protects biomolecules against oxidative damage by breaking down hydrogen peroxide (H 2 O 2 ) into water and oxygen. CAT is present in all aerobic microbes, animals, and plants. It is, however, absent from normal human urine but can be detected in pathological urine. CAT testing can thus help to detect such urine. This study presents a novel spectrophotometric method for determining CAT activity characterized by its simplicity, sensitivity, specificity, and rapidity. The method involves incubating enzyme-containing samples with a carefully chosen concentration of H 2 O 2 for a specified incubation period. Subsequently, a solution containing ferrous ammonium sulfate (FAS) and sulfosalicylic acid (SSA) is added to terminate the enzyme activity. A distinctive maroon-colored ferrisulfosalicylate complex is formed. The formation of this complex is a direct result of the reaction between FAS and any residual peroxide present. This leads to the generation of ferric ions when coordinated with SSA. The complex has a maximum absorbance of 490 nm. This advanced method eliminates the need for concentrated acids to stop CAT activity, making it safer and easier to handle. A comparative analysis against the standard ferrithiocyanate method showed a correlation coefficient of 0.99, demonstrating the new method's comparable effectiveness and reliability. In conclusion, a simple and reliable protocol for assessing CAT activity, which utilizes a cuvette or microplate, has been demonstrated in this study. This interference-free protocol can easily be used in research and clinical analysis with considerable accuracy and precision.
Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this article.
(© The Author(s) 2024. Published by Oxford University Press.)
Databáze: MEDLINE
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