Polymeric films as matrixes for the immobilization of mixed natural dyes for optical ph sensor

Translated title of the contribution: Filem polimer sebagai matriks pemegunan pewarna campuran semula jadi untuk sensor ph

Noor Azizah Ahmad, Lee Yook Heng, Sharina Abu Hanifah, Faridah Salam

Research output: Contribution to journalArticle

Abstract

The characterization of pH sensors based on mixed natural dye from Clitoria sp and Brassica sp plant extracts on several types of polymers film have been performed. The polymer matrixes that have been studied were carrageenan (ι-and κ-), corn’s starch and carboxyl methyl cellulose. The suitability of the polymer film is assessed in terms of water solubility, water absorption and leaching properties of the immobilized sensor material from the film. The study showed that ι-carrageenan film meets the required criteria as a sensor film. The pH sensor developed with the ι-carrageenan film shows the relative standard deviation (RSD) values are below 5% level of pH 4, 7 and 12 for repeatability and reproducibility properties. The response time of the pH sensor film for fully respond is 2 minutes during immersion period. The ι-carrageenan-based pH sensor film can be kept at room temperature for 7 days without response changes (RSD 1.85%). Photo stabilization of pH sensor film after 12 weeks stored at 4°C still shows stable response (RSD 1.63%). The hysteresis effect on the pH sensor was also found to be minimum by using this ι-carrageenan film. Therefore, the criterion found in the ι-carrageenan film immobilized with mixed natural dye indicates to be used as a potential pH sensor, especially in the monitoring of food freshness during storage.

Original languageMalay
Pages (from-to)799-811
Number of pages13
JournalMalaysian Journal of Analytical Sciences
Volume23
Issue number5
DOIs
Publication statusPublished - Oct 2019

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pH sensors
Carrageenan
Polymer films
Coloring Agents
Methylcellulose
Plant Extracts
Sensors
Water absorption
Polymer matrix
Starch
Leaching
Hysteresis
Stabilization
Solubility

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Polymeric films as matrixes for the immobilization of mixed natural dyes for optical ph sensor. / Ahmad, Noor Azizah; Heng, Lee Yook; Hanifah, Sharina Abu; Salam, Faridah.

In: Malaysian Journal of Analytical Sciences, Vol. 23, No. 5, 10.2019, p. 799-811.

Research output: Contribution to journalArticle

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abstract = "The characterization of pH sensors based on mixed natural dye from Clitoria sp and Brassica sp plant extracts on several types of polymers film have been performed. The polymer matrixes that have been studied were carrageenan (ι-and κ-), corn’s starch and carboxyl methyl cellulose. The suitability of the polymer film is assessed in terms of water solubility, water absorption and leaching properties of the immobilized sensor material from the film. The study showed that ι-carrageenan film meets the required criteria as a sensor film. The pH sensor developed with the ι-carrageenan film shows the relative standard deviation (RSD) values are below 5{\%} level of pH 4, 7 and 12 for repeatability and reproducibility properties. The response time of the pH sensor film for fully respond is 2 minutes during immersion period. The ι-carrageenan-based pH sensor film can be kept at room temperature for 7 days without response changes (RSD 1.85{\%}). Photo stabilization of pH sensor film after 12 weeks stored at 4°C still shows stable response (RSD 1.63{\%}). The hysteresis effect on the pH sensor was also found to be minimum by using this ι-carrageenan film. Therefore, the criterion found in the ι-carrageenan film immobilized with mixed natural dye indicates to be used as a potential pH sensor, especially in the monitoring of food freshness during storage.",
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