Fiber-Optic Sensor with a Dye-Modified Chitosan/Poly(vinyl alcohol) Cladding for the Determination of Organic Acids

Organic acids in aqueous solution were determined with a fiber-optic sensor having a chitosan/poly(vinyl alcohol) cladding. Interference from ethanol could be reduced by controlling the crosslinking of the cladding with glutaraldehyde and by modifying the cladding with 5′, 5"-dibromopyrogallols...

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Veröffentlicht in:	Analytical Sciences 1996/02/10, Vol.12(1), pp.55-59
Hauptverfasser:	KURAUCHI, Yoshiaki, OGATA, Tohru, EGASHIRA, Naoyoshi, OHGA, Kazuya
Format:	Artikel
Sprache:	eng
Schlagworte:	Analytical chemistry Biological and medical sciences Chemistry dye-modified chitosan/poly(vinyl alcohol) cladding Exact sciences and technology Fermented food industries Fiber-optic sensor Food industries Fundamental and applied biological sciences. Psychology Miscellaneous on-line analysis organic acid Tecnics, calculations, apparatus
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Zusammenfassung:	Organic acids in aqueous solution were determined with a fiber-optic sensor having a chitosan/poly(vinyl alcohol) cladding. Interference from ethanol could be reduced by controlling the crosslinking of the cladding with glutaraldehyde and by modifying the cladding with 5′, 5"-dibromopyrogallolsulfonphthalein. The response time for 5v/v% acetic acid was within 1min and the RSD was ca. 2% for 10 successive measurements. Coating of the cladding with an amorphous fluoropolymer increased its durability and removed interferences from inorganic acids and non-volatile compound.
ISSN:	0910-6340 1348-2246
DOI:	10.2116/analsci.12.55