Linked Life Data

19402723

Source:http://linkedlifedata.com/resource/pubmed/id/19402723

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
2009-4-30
pubmed:abstractText
Several porphyrin and salophen complexes with Rh(III) are examined as ionophores to prepare nitrite selective polymeric membrane electrodes. All ionophores tested exhibit preferred selectivity toward nitrite anion. Enhanced potentiometric nitrite selectivity is observed in the presence of either lipophilic anionic as well as cationic sites within the membranes, suggesting that the ionophores can function via either a charged or a neutral carrier response mechanism. Among a range of complexes and membrane formulations examined, optimal nitrite selectivity and reversible response down to 5 x 10(-6) M is achieved using Rh(III)-tetra(t-butylphenylporphyrin) as the ionophore in the presence of lipophilic cationic sites in plasticized poly(vinyl chloride) membrane. Response times are substantially longer than typical membrane electrodes apparently because of a slow nitrite ligation reaction with Rh(III); however, a significant improvement in dynamic EMF response can be realized by optimizing the membrane formulation and increasing the temperature. The selectivity observed with these membranes is greater than the best nitrite selective electrodes reported to date in the literature based on lipophilic Co(III)-corrin complexes, allowing the new nitrite electrodes to be utilized to determine the level of nitrite in meats with good correlation to the colorimetric Griess assay method.
pubmed:grant
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-10740849, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-11128934, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-11196995, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-11562407, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-14585716, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-17631098, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-18968301, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-18970107, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-3057363, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-3619062, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-7489775, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-8849027, http://linkedlifedata.com/resource/pubmed/commentcorrection/19402723-9709496
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
1520-6882
pubmed:author
pubmed:issnType
Electronic
pubmed:day
1
pubmed:volume
81
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3637-44
pubmed:dateRevised
2010-12-3
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Polymeric membrane electrodes with high nitrite selectivity based on rhodium(III) porphyrins and salophens as ionophores.
pubmed:affiliation
Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural