Document Detail


Study on the kinetic properties of phosphor in deoxycholate aggregates by phosphorescent quenching methodology.
MedLine Citation:
PMID:  17570675     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Owing to the unique molecular structure and aggregate behaviors in aqueous solution, dihydroxy bile salts can provide phosphorescent probe with a special microenvironment in which the room temperature phosphorescence of probe can be detected in the presence of dissolved oxygen. It, however, is not very clear how the bile salts work in inducing this kind of oxygen-independent phosphorescence. The present work tries to offer with possible more insights by investigating the particular kinetic behaviors of 3-bromoquinoline (3-BrQ) as probe in sodium deoxycholate (NaDC) aggregate based on phosphorescent quenching methodology. The critical aggregate concentration of NaDC is estimated as about 0.5mM based on the enhancement of probe phosphorescence. As the functions of quencher Cu(2+) and NO(2)(-), the rate constants of various photophysical processes for 3-BrQ are obtained in NaDC solution and full aqueous solution, respectively. In NaDC solution, the quenching rate constant k(cu2+) equals to 1.77x10(7)M(-1)s(-1) k(no-2)(mq) 1.62x10(6)M(-1)s(-1). The exit rate k(-) and entrance rate k(+) are determined to be 16-46s(-1) and 10(6)M(-1)s(-1) levels, respectively. The quenching rate constant k(o2)(q) of dissolved oxygen is estimated as 4.15x10(4)M(-1)s(-1) in air-saturated NaDC solution at 1atm.
Authors:
Hong-Mei Zhang; Yu Wang; Wei-Jun Jin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-05-10
Journal Detail:
Title:  Journal of photochemistry and photobiology. B, Biology     Volume:  88     ISSN:  1011-1344     ISO Abbreviation:  J. Photochem. Photobiol. B, Biol.     Publication Date:  2007 Jul 
Date Detail:
Created Date:  2007-07-30     Completed Date:  2008-01-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804966     Medline TA:  J Photochem Photobiol B     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  36-42     Citation Subset:  IM    
Affiliation:
School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, PR China.
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MeSH Terms
Descriptor/Qualifier:
Bile Acids and Salts / chemistry
Deoxycholic Acid / chemistry*
Fluorescent Dyes / chemistry
Kinetics
Luminescent Measurements*
Oxygen / metabolism
Quinolines / chemistry
Chemical
Reg. No./Substance:
0/Bile Acids and Salts; 0/Fluorescent Dyes; 0/Quinolines; 7782-44-7/Oxygen; 83-44-3/Deoxycholic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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