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An Ionophore-Based Anion-Selective Optode Printed on Cellulose Paper.

ABSTRACT: A general anion-sensing platform is reported based on a portable and cost-effective ion-selective optode and a smartphone detector equipped with a color analysis app. In contrast to traditional anion-selective optodes using a hydrophobic polymer and/or plasticizer to dissolve hydrophobic sensing elements, the new optode relies on hydrophilic cellulose paper. The anion ionophore and a lipophilic pH indicator are inkjet-printed and adsorbed on paper and form a "dry" hydrophobic sensing layer. Porous cellulose sheets also allow the sensing site to be modified with dried buffer that prevents any sample pH dependence of the observed color change. A highly selective fluoride optode using an AlIII -porphyrin ionophore is examined as an initial example of this new anion sensing platform for measurements of fluoride levels in drinking water samples. Apart from Lewis acid-base recognition, hydrogen bonding recognition is also compatible with this sensing platform.

SUBMITTER: Wang X

PROVIDER: S-EPMC5618716 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature

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An Ionophore-Based Anion-Selective Optode Printed on Cellulose Paper.

Wang Xuewei X Zhang Qi Q Nam Changwoo C Hickner Michael M Mahoney Mollie M Meyerhoff Mark E ME

Angewandte Chemie (International ed. in English) 20170816 39

A general anion-sensing platform is reported based on a portable and cost-effective ion-selective optode and a smartphone detector equipped with a color analysis app. In contrast to traditional anion-selective optodes using a hydrophobic polymer and/or plasticizer to dissolve hydrophobic sensing elements, the new optode relies on hydrophilic cellulose paper. The anion ionophore and a lipophilic pH indicator are inkjet-printed and adsorbed on paper and form a "dry" hydrophobic sensing layer. Poro ...[more]

PMID: 28715617

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