The Diazo-quinone of P Q Q as a Possible Reagent for Mapping Quinoproteins by Photo-affinity Labeling PQQ is an organic redox cofactor found in a class of enzymes called quinoproteins. The synthesis and the photochemistry of the diazo-quinones of PQQ and PQQ-triester are described. The photogenerate
Derivatisierung von PQQ und PQQ-Triester für den Nachweis von PQQ
✍ Scribed by Pierre Martin; Tammo Winkler
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- German
- Weight
- 476 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Formation of derivatives of PQQ and PQQ‐Triester for the Detection of PQQ
PQQ is an organic redox/cofactor found in a class of enzymes called quinoproteins. It has been reported that materials like milk, egg yolk, vinegar, beer, serum, urine, and biological tissues contain little amounts of PQQ. To facilitate studies on PQQ, a simple detection of PQQ could be extremely useful. For this purpose, we describe in this paper some adducts of PQQ or PQQ‐triester with 1,2‐diamines, 2,4‐dihydroxyaniline, pyrrole, indole as well as an oxidation product of PQQ. UV and fluorimetric detections of these colored products show that this method is relatively sensitive. The reaction of PQQ‐triester with (MeO)~3~P to the phosphole adduct 13 is of great importance: the use of [^32^P]‐labeled trialkyl phosphites will make this reaction an extremely sensitive method to detect PQQ.
📜 SIMILAR VOLUMES
I)ifTrra.iiz :iuI t l i v ~litl,c~sliiiiiiiuiig voii Pliosphalideii Iici drr mung iiacli Go I I I i e b -H o c s e untl G e 1' 1) e r resllos ge- G n t I I i t s t i -I< o e s c -Mcthode zuriickzufiihrcbii seiii. kliirt werdcn. Es diirfk sich rmpfehlcii. h i den Exlrak-I k i c l ~~ I3rtlenliuig der
The plant pathogenic Pseudomonas syringae pv. phaseolicola possesses a fructokinase which is epigenetically regulated. The KM values for fructose and ATP are 0.56 and 0.53 niM, respectively. About 23% of the activity observed with ATP was obtained with equimolar amounts of ITP. CTP, GTP, UTP, PEP an
## Abstract Zur Vermeidung von Fehlschlüssen bei der Identifizierung von Mykotoxinen mit Hilfe der Dünnschichtchromatographie (Kieselgel) ist es erforderlich, zur Bestätigung ein zweites Nachweisverfahren einzusetzen. Für Patulin eignet sich die Derivatisierung auf der Platte mit Phenylhydrazin und