کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
750503 | 1462067 | 2016 | 5 صفحه PDF | دانلود رایگان |
• The anthocyanins of red grape were extracted.
• Red grape extract is covalently bonded to a transparent epoxy activated agarose film.
• The prepared optical sensor successfully applied for pH monitoring.
• The sensor responds rapidly to the pH changes in a range of 1–10.
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 100 mg L−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 3.0 min 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.
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Journal: Sensors and Actuators B: Chemical - Volume 224, 1 March 2016, Pages 391–395