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Determination of fluorescent whitening agents in paper and board packaging materials by capillary electrophoresis

✍ Scribed by Andrew P. Damant; Laurence Castle

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 84 KB
Volume: 11
Category: Article
ISSN: 1040-7685
DOI: 10.1002/(sici)1520-667x(1999)11:4<259::aid-mcs2>3.0.co;2-k

No coin nor oath required. For personal study only.

✦ Synopsis

Fluorescent whitening agents FWAs are large, conjugated, anionic substances added to paper and board during manufacture to impart ''whiteness'' and ''brightness.'' A method has been developed to determine disulfo-, tetrasulfo-, Ž . and hexasulfo-FWAs in paper and board using capillary electrophoresis CE . Fluorescent whitening agents are extracted from paper samples using a standard hot-water extraction. The extracts are analyzed by free-flow CE using ammonium Ž . acetate 100 mM, pH 9.0 as the run buffer. Fluorescent whitening agents are Ž . detected by through-column ultraviolet UV scanning between 195 and 365 nm.

Ž . Limits of detection mgrkg paper ranged between 2 and 12 mgrkg with recoveries between 84 and 92%. Analysis of three samples of commercial ''take-out'' food packaging found concentrations of tetrasulfo-FWA ranging between 200 and 223 mgrkg with no interferences. This is similar to concentrations found in a previous study using liquid chromatography.

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