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• W1997578701 abstract "Nitric oxide (NO) bioactivity is mainly conveyed through reactions with iron and thiols, furnishing iron nitrosyls and S -nitrosothiols with wide-ranging stabilities and reactivities. Triiodide chemiluminescence methodology has been popularized as uniquely capable of quantifying these species together with NO byproducts, such as nitrite and nitrosamines. Studies with triiodide, however, have challenged basic ideas of NO biochemistry. The assay, which involves addition of multiple reagents whose chemistry is not fully understood, thus requires extensive validation: Few protein standards have in fact been characterized; NO mass balance in biological mixtures has not been verified; and recovery of species that span the range of NO-group reactivities has not been assessed. Here we report on the performance of the triiodide assay vs. photolysis chemiluminescence in side-by-side assays of multiple nitrosylated standards of varied reactivities and in assays of endogenous Fe- and S -nitrosylated hemoglobin. Although the photolysis method consistently gives quantitative recoveries, the yields by triiodide are variable and generally low (approaching zero with some standards and endogenous samples). Moreover, in triiodide, added chemical reagents, changes in sample pH, and altered ionic composition result in decreased recoveries and misidentification of NO species. We further show that triiodide, rather than directly and exclusively producing NO, also produces the highly potent nitrosating agent, nitrosyliodide. Overall, we find that the triiodide assay is strongly influenced by sample composition and reactivity and does not reliably identify, quantify, or differentiate NO species in complex biological mixtures." @default.
• W1997578701 created "2016-06-24" @default.
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• W1997578701 date "2007-02-13" @default.
• W1997578701 modified "2023-10-15" @default.
• W1997578701 title "Assessment of nitric oxide signals by triiodide chemiluminescence" @default.
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• W1997578701 doi "https://doi.org/10.1073/pnas.0611191104" @default.
• W1997578701 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1892991" @default.
• W1997578701 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17287342" @default.
• W1997578701 hasPublicationYear "2007" @default.
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