The Anthocyanin Extract from Orchid Flower Used as an Acid-base Naked-eye Sensor
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Abstract
In this research, an acid-base detector was created using anthocyanin extract from orchid flowers. The anthocyanin was easily extracted in an aqueous solution. The results indicate that the cyanidin-3-glucoside content of the extract was 7.91+0.72 mg/l. The pH of the extract was 5.03±0.05. The total soluble solids were 2.69±0.63. The color changed with pH 2.0-10.0 buffer solution showing a color change from red to green when tested from acid to base. The extract was assigned as a probe by impregnating it on cellulose paper. The paper detector can change the color for naked-eye detection. When tested with pH buffer solutions ranging from 2.0 to 10.0, the total color difference (∆E) was greater than 5. Additionally, when comparing the pH of the solution from cellulose paper with the pH meter and universal indicator paper, similar results were obtained. Therefore, anthocyanin extracts from orchids can be used as a pH-base tester.
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References
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