Development of paper indicator from sambang colok (Aerva sanguinolenta) plant extract

This study aims to develop a paper indicator from Aerva sanguinolenta plant extract. The experimental method is used including the analysis of the dye, the extraction of various solvents, the test of the phenolic compound, and the absorbance measurement of the UV-Vis spectrophotometry of the plant extract, and the creation of indicator paper by absorbing the extract of A. sanguinolenta, and testing it on the pH range of 1-14. The experimental results show that the indicator made from coarse filter paper with ethanol extract of the polypropylene binder of the decoction product has the best characteristic shown by the absorbance of 1,186 ppm of bright purple anthocyanin. The resulting color change range is evident from purple to yellow in the pH range 11-12. This research is expected to facilitate the teacher using indicator paper in practice.