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Polymers 2018, 10(1), 13; https://doi.org/10.3390/polym10010013

A pH-Sensing Film from Tamarind Seed Polysaccharide with Litmus Lichen Extract as an Indicator

1
Key Laboratory of Bio-Based Materials Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China
2
Research Center of Wood Bionic Intelligent Science, Northeast Forestry University, Harbin 150040, China
*
Author to whom correspondence should be addressed.
Received: 21 November 2017 / Accepted: 20 December 2017 / Published: 22 December 2017
(This article belongs to the Special Issue Polymers for Packaging Applications)
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Abstract

A new pH-sensing film was developed by using tamarind seed polysaccharide (TSP) and natural dye extracted from litmus lichen (LLE). The addition of LLE from 0 to 2.5% decreased the tensile strength and elongation at break from 30.20 to 29.97 MPa and 69.73% to 60.13%, respectively, but increased the water vapor permeability from 0.399 × 10−9 to 0.434 × 10−9 g·s−1·m−1·Pa−1. The UV–Vis spectra of the litmus lichen extract (LLE) in the pH range of 4–10 showed that the color clearly changed from orange to blue. The characterization results showed that TSP interacted with LLE through hydrogen bonds. The color of the film varied from orange (pH 4.0) to blue-violet (pH 10.0). The full cream milk spoilage test indicated that the film is suitable for application in full cream milk spoilage detection. The developed pH-sensing film could be used as a promising diagnostic tool for the detection of food spoilage. View Full-Text
Keywords: tamarind seed polysaccharide; pH sensing; litmus lichen extract; packaging film tamarind seed polysaccharide; pH sensing; litmus lichen extract; packaging film
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Liang, T.; Wang, L. A pH-Sensing Film from Tamarind Seed Polysaccharide with Litmus Lichen Extract as an Indicator. Polymers 2018, 10, 13.

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