Linked Life Data

1319209

Source:http://linkedlifedata.com/resource/pubmed/id/1319209

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1992-7-30
pubmed:abstractText
Procedures for the unambiguous detection and for the isolation and mass spectrometric identification of pyrroloquinoline quinone (PQQ) are presented. The procedure involved acid hydrolysis of protein in the presence of phenylhydrazine and successive isolation and identification of the formed adduct using mass spectrometry. In HPLC the phenylhydrazone of PQQ gave many methylated products, of which the predominant compound was the pentamethylated derivative. After reaction of the phenylhydrazone derivative of PQQ (PHPQQ) with ammonia, a product was obtained which did not contain phenylhydrazine and which formed a pentamethylated derivative as the main methylation product. The HPLC profiles of the methylated products of PHPQQ and of its ammonia derivative were very characteristic and could be used for identification in addition to mass spectrometry. However, prolonged treatment of proteins with phenylhydrazine during hydrolysis can result in the formation of a material that resembles PQQ in some aspects of its behaviour. Thus, analysis by MS is essential for unambiguous identification. This analytical procedure was applied to pig plasma benzylamine oxidase, pig aorta lysyl oxidase, pig kidney diamine oxidase and bovine serum albumin with negative results. However, samples of pronase contained variable quantities of non-covalently bound PQQ: this can lead to erroneous identification of PQQ in enzyme after pronase digestion.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
12
pubmed:volume
1116
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
297-304
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Pyrroloquinoline quinone, a method for its isolation and identification by mass spectrometry.
pubmed:affiliation
Department of Pharmacology, University of Florence, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't