Abstract
The development of a novel green optical pH sensor for a wide range pH values is described based on the immobilization of grape extract on an optically transparent agarose biopolymer. Siahe Sardasht grape is a famous variety of grape in Iran that is used for red grape juice concentrate. The anthocyanins of Siahe Sardasht grape were extracted and used as a suitable dye for the preparation of a pH optical sensor, by its immobilization on a transparent agarose film. In an optimized coupling, pH of 10 and a dye concentration of 100mgL−1, a sensitive sensor with long term stability was obtained. The sensor responds rapidly to the pH changes in a range of 1–10 with a response time of 3.0min and repeatability better than 0.3% (RSD). The sensor was mounted in the quartz cells and successfully applied for pH monitoring. No evidence of leaching of the dye or any signal drift was observed.
Published Version
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