Exploring Plant Species in Vietnam for the Production of pH Indicator Paper

Abstract

Purple cabbage, turmeric, magenta, amaranth, and red beet contain colour anthocyanins. These colours change  according to pH environments. This research aims to explore the potential of utilizing various plant species, such as  purple cabbage, turmeric, magenta, amaranth, and red beet, to develop pH indicator paper. The colour solutions of  these plants were extracted with deionized water. The extracted solutions were analyzed by IR spectra and UV-Vis  spectra. The peak of OH, C=O, and C-O in IR spectra changed in alkaline, neutral, and acidic environments, respectively. The maximum absorption wavelengths of the extracted solutions in UV-Vis spectra were 533 nm and 600 nm in alkaline  and neutral environments, respectively. The pH indicator paper was created by impregnating plain white computer  paper with extract solutions to achieve uniform colouration. These prepared pH indicator papers were used to detect  the pH of household chemicals, including milk, soap, toothpaste, and various fruits and vegetables. The study  demonstrates that these plant species exhibit excellent sensitivity to different pH values, possess good durability, and  remain unaffected by environmental factors. The developed pH indicator paper holds promising practical applications  for testing the pH of diverse chemicals. In this study, the pH indicator paper was employed to determine the acidity or  alkalinity levels of commonly found household items, including fruits, beverages, and cleaning solutions. The results highlight the versatility and convenience of utilizing plant-based pH indicator paper for monitoring pH variations in daily life applications.