Anthocyanin Extraction from Purple Banggai Yam Skin (Dioscorea alata L) as Acid-Base Bioindicators and Potential in Chemistry Learning

DOI

10.2991/978-2-38476-537-9_11How to use a DOI?

Keywords

acid-base bioindicator; purple banggai yams

Abstract

Anthocyanins are natural pigments that can give color to plants, including purple banggai yams (Dioscorea alata L). Purple yams contain anthocyanin compounds that are sensitive to pH because they can show color changes in both acidic and alkaline pH, so they have the potential to be used as natural acid-base indicators that are environmentally friendly and economical and can replace synthetic indicators. This study aims to determine whether purple yams can be used as acid-base bioindicators. Extraction was carried out using a stepwise maceration method with n-hexane, ethyl acetate, and 70% ethanol as solvents. The extraction results were purple-colored filtrates and were tested qualitatively with 0.1 M HCl and 0.1 M NaOH, producing red and green color changes. Quantitative testing using UV-Vis spectrophotometry with the differential pH method showed that the total anthocyanin content in the extract was 60.5334 mg/L. The indicator test results on a pH 1-14 buffer solution showed a red color change at pH 1-4, pink at pH 5-6, colorless at pH 7, green at pH 8-13, and yellow at pH 14. The purple banggai yams extract test kit was made in the form of indicator paper that showed a red color change in acid and green in base.

Copyright

© 2026 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Sayu Komang Oktaviani
AU  - Tri Santoso
AU  - Anang W. M. Diah
AU  - Hockcu Suhanda
AU  - Sitti Aminah
PY  - 2026
DA  - 2026/02/19
TI  - Anthocyanin Extraction from Purple Banggai Yam Skin (Dioscorea alata L) as Acid-Base Bioindicators and Potential in Chemistry Learning
BT  - Proceedings of the 3rd International Conference on Education (ICE-3 2025)
PB  - Atlantis Press
SP  - 108
EP  - 118
SN  - 2352-5398
UR  - https://doi.org/10.2991/978-2-38476-537-9_11
DO  - 10.2991/978-2-38476-537-9_11
ID  - Oktaviani2026
ER  -