Linked Life Data

9025965

Source:http://linkedlifedata.com/resource/pubmed/id/9025965

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1997-4-7
pubmed:abstractText
A test based on time-resolved fluorescence experiments is proposed to assess the interference of an excited-state reaction with the fluorimetric determination of the ground-state dissociation constant Kd of ion [symbol: see text] fluorescent indicator complexes. If an inflection point occurs in the plot of the fluorescence signal vs -log [ion] in the concentration range of the ion where both decay times are invariant, this inflection point can be associated with the correct Kd. In contrast, the inflection point(s) in the concentration range where the decay times vary cannot be attributed to Kd. The test is applied to the fluorescent ion indicators SBFI (for Na+), PBFI (for K+), and Fura-2 (for Ca2+). In all three cases the decay times are invariant in the physiological concentration ranges of the respective ions, indicating that the fluorimetrically determined Kd values are actually the true Kd values.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0003-2697
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
245
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
28-37
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Potential misevaluation of the ground-state dissociation constant from fluorimetric titrations: application to the ion indicators SBFI, PBFI, and fura-2.
pubmed:affiliation
Institute of Physics, Nicholas Copernicus University, Torun, Poland.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't