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Determination of small amounts of L-ascorbic acid using the chemiluminescence of an iron-chlorophyllin complex.
MedLine Citation:
PMID:  15913152     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Chemiluminescence (CL) was immediately observed after an iron-chlorophyllin aqueous solution was added to an acetonitrile/water mixed solution containing hydrogen peroxide. Quenching of the iron-chlorophyllin complex CL was caused by adding L-ascorbic acid. Based on these facts, a determination method involving small amounts of L-ascorbic acid was developed. As a result, this CL system is able to determine L-ascorbic acid over a wide concentration range of 4.0 x 10(-12) to 4.0 x 10(-4) mol L(-1). Also, coexisting substances, such as sugar and vitamins, did not interfere with the determination. Moreover, the participation to the CL was not observed when using other reducing agents, such as hydroxylamine hydrochloride. As an application for practical use, L-ascorbic acid in soft-drink powder was determined. The experimental value was almost the same as the calculated one (5.30 x 10(-5) mol L(-1)).
Authors:
Takeshi Kato; Osamu Ohno; Toshimasa Nagoshi; Yoshihiro Ichinose; Shukuro Igarashi
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Analytical sciences : the international journal of the Japan Society for Analytical Chemistry     Volume:  21     ISSN:  0910-6340     ISO Abbreviation:  Anal Sci     Publication Date:  2005 May 
Date Detail:
Created Date:  2005-05-25     Completed Date:  2006-05-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8511078     Medline TA:  Anal Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  579-81     Citation Subset:  -    
Affiliation:
Department of Materials Science, Faculty of Engineering, Ibaraki University, Nakanarusawa 4-12-1, Hitachi, Ibaraki 316-8511, Japan.
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