Fluorescent poly(styrene-block-vinylpyrrolidone) nanobeads for optical sensing of pH

被引：51

作者：

Borisov, Sergey M. ^{[1
]}

Herrod, Danielle L. ^{[2
]}

Klimant, Ingo ^{[1
]}

机构：

[1] Graz Univ Technol, Inst Analyt Chem & Radiochem, A-8010 Graz, Austria

[2] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2009年 / 139卷 / 01期

关键词：

Optical sensor; pH; Nanobeads; Fluorescence; SENSORS; MICROBIOREACTOR; NANOPARTICLES; NANOSENSORS; SYSTEM; OXYGEN; RANGE; BEADS; FILMS;

D O I：

10.1016/j.snb.2008.08.028

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Nanosensors for pH are prepared by staining poly(styrene-block-vinylpyrrolidone) nanobeads with lipophilic pH indicators based on fluoresceins and 1-hydroxypyrene-3,6,8-trisulfonate. Fine tuning of the pH-sensing properties is achieved by varying substituents on the pH indicator. Fluoresceins based on octadecylester- and 5(6)-N-alkyl-carboxamido derivatives show significantly different sensing properties due to lactonization occurring in the latter. The nanobeads show pK(a) values varying from 5.6 to 7.7, possess low cross-sensitivity to the ionic strength, and are potentially suitable for application in biology, biotechnology. marine science, and other fields. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：52 / 58

页数：7

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