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pubmed-article:1252466pubmed:abstractTextThe electronic absorption spectra of individual ionic forms of pyridoxal phosphate and of a series of related aldehydes have been evaluated together with pKa values. Spectral resolution with lognormal curves has permitted the quantitative description of equilibria for hydration and tautomerization. Precise values of peak positions for both aldehyde and hydrate forms have been obtained. Measurements of temperature-induced changes in the spectra have provided additional information. Knowing the hydration ratios and stepwide acid dissociation constants, it is possible to evaluate microscopic acid dissociation constants for both the aldehyde and hydrate forms of the compounds.lld:pubmed
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pubmed-article:1252466pubmed:authorpubmed-author:JohnsonR JRJlld:pubmed
pubmed-article:1252466pubmed:authorpubmed-author:MetzlerD EDElld:pubmed
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pubmed-article:1252466pubmed:pagination181-94lld:pubmed
pubmed-article:1252466pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:1252466pubmed:articleTitleBand-shape analysis and resolution of electronic spectra of pyridoxal phosphate and other 3-hydroxypyridine-4-aldehydes.lld:pubmed
pubmed-article:1252466pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1252466pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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