Document Detail


Separation of crystal violet dyes and its application to pen ink analysis using CZE and MEKC methods.
MedLine Citation:
PMID:  18275107     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
A crystal violet (CV) standard was irradiated under a Hg-Cd lamp for different exposure times to obtain various N-demethylation products. CZE effectively separated the photodegradation products based on molecular weight differences. In contrast, micellar EKC (MEKC), using SDS as the surfactant, was ineffective because the binding constants of the demethylation products and SDS were too close for separation. Nevertheless, MEKC analysis of ink has applications in forensic science because MEKC separated neutral components in the inks. Thus, MEKC can be used to obtain an ink "fingerprint" since each ink is unique depending on the location and time it was made. In contrast, CZE is useful for dating inks because CV is the primary ink dye and it photodegrades slowly.
Authors:
Chun-Min Shih; Ju-Tsung Liu; Bo-Hong Chen; Cheng-Huang Lin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of separation science     Volume:  31     ISSN:  1615-9314     ISO Abbreviation:  J Sep Sci     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-03-24     Completed Date:  2008-06-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088554     Medline TA:  J Sep Sci     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  893-7     Citation Subset:  -    
Affiliation:
Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan.
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