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Synthesis of naphthalimide-based indicator dyes with a 2-hydroxyethylsulfonyl function for covalent immobilisation to cellulose

A new approach for the synthesis of 2-hydroxyethylsulfonyl type indicator dyes has been introduced to the naphthalimide chemical structure. Thus, fluorescent indicator dyes can be obtained that can be covalently linked to cellulose used e.g. in optical sensor layers, textiles and wound dressings. Th...

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Published in:	Sensors and actuators. B, Chemical Chemical, 2018-12, Vol.275, p.439-445
Main Author:	Mohr, Gerhard J.
Format:	Article
Language:	English
Subjects:	Biosensors Cellulose Chemosensors Covalence Dyes Fluorescent indicators Immobilization Optical measuring instruments Optical sensors Organic chemistry pH detection Smart textiles Synthesis Textiles Vinylsulfonyl dyes
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description	A new approach for the synthesis of 2-hydroxyethylsulfonyl type indicator dyes has been introduced to the naphthalimide chemical structure. Thus, fluorescent indicator dyes can be obtained that can be covalently linked to cellulose used e.g. in optical sensor layers, textiles and wound dressings. The approach is tailored to be simple in synthesis and with a minimum number of steps required to obtain a highly functional and stable sensor material. Three different pH indicator dyes have been prepared and covalently immobilised to transparent cellulose layers. The pKa values of the cellulose-immobilised dyes were found to be at around 3, 6 and 7, thus covering the physiologically relevant pH range. Using the 2-hydroxyethylsulfonyl group, covalent immobilisation of naphthalimides with various receptor functions may become possible.
doi_str_mv	10.1016/j.snb.2018.07.095
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subjects	Biosensors Cellulose Chemosensors Covalence Dyes Fluorescent indicators Immobilization Optical measuring instruments Optical sensors Organic chemistry pH detection Smart textiles Synthesis Textiles Vinylsulfonyl dyes
title	Synthesis of naphthalimide-based indicator dyes with a 2-hydroxyethylsulfonyl function for covalent immobilisation to cellulose
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