Study of Ethanol Extract of Karamunting (Rhodomyrtus tomentosa (Aiton) Hassk) as Acid-Base Bioindicator
DOI:
https://doi.org/10.22487/j24775185.2023.v12.i3.pp154-159Keywords:
Karamunting fruit, anthocyanin, extract, alternative acid-base indicatorAbstract
Karamunting or Rhodomyrtus tomentosa (Aiton) Hassk is a fruit that contains anthocyanins. This study aimed to determine the potential of the ethanol extract of this fruit as an acid-base bioindicator. Karamuting fruit was macerated using three solvents (n-hexane, ethyl acetate, and ethanol) for 24 hours. The extract of the karamunting fruit was tested as indicators in acid-base solutions and buffer solutions and compared with phenolphthalein and methyl orange for acid-base titrations, namely: Strong acids with strong bases, weak acids with strong bases and weak bases with strong acids. The results showed that the ethanol extract of karamunting fruit was brown, in strong acids was red, in strong bases was dark green, in weak acids was pink, and in weak bases was light green. Furthermore, the kara munting fruit indicator extract buffer solution gave four groups of colour changes, namely, at pH 1, it was red; at pH 2 to 6, it was pink; at pH 7 to pH 10, it was light green; and at pH 11 to 12, it was dark green. The ethanol extract of karamunting fruit can be used as an acid-base indicator because it gives equivalent results to comparative indicators, namely phenolphthalein and methyl orange.
References
Afandy, M. A., Nuryanti, S., & Diah, A. W. M. (2017). Ekstraksi ubi jalar ungu (ipomea batatas l.) menggunakan variasi pelarut serta pemanfaatannya sebagai indikator asam basa. Jurnal Akademika Kimia, 6(2), 79-85.
Alvionita, J., Darwis, D., & Efdi, M. (2016). Ekstraksi dan identifikasi senyawa antosianin dari jantung pisang raja (musa x paradisica l) serta uji aktivitas antioksidannya. Jurnal Riset Kimia, 9(2), 21-28.
Bakowska-Barczak, A. (2005). Acylated anthocyanins, as stable, natural food colorants. Polish Journal of Food and Nutrition Sciences, 14(2), 107-116.
Goldberg, E. D. (2003). Schaum’s easy outlines kimia untuk pemula. Jakarta: Erlangga.
Harborne, J. B. (1958). Spectral methods of characterizing anthocyanins. Biochemical Journal, 70(1), 22-28.
Hidayah, N., Hisan, A. K., Solikin, A., Irawati., & Mustikaningtyas, D. (2016). Uji efektivitas ekstrak sargassum muticum sebagai alternatif obat bisul akibat aktiviitas staphylococcus aureus. Journal of Creativity Students, 1(1), 1-9.
Hidayati, A. S., & Harjono. (2017). Uji aktiviitas antibakteri krim ekstrak daun babadotan (ageratum conyzoides, l) dalam pelarut etanol. Indonesian Journal of Mathematics and Natural Sciences, 40(1), 33-38.
Khairunnisa., Khairuddin., & Pusptasari, D. J. (2017). Kajian ekstrak etanol mahkota bunga ketepeng cina (cassia alata l) sebagai bioindikator asam-basa. KOVALEN: Jurnal Riset Kimia, 3(3), 292-302.
Kurniati, T., Kurniasih, D., & Purwanti, S. M. D. (2017). Pengujian zat warna dari ekstrak buah naga (hylocereus polyrhizus) dan cengkodok (melastomas malabathricum) sebagai indikator alami. Ar-Razi Jurnal Ilmiah, 5(1), 133-138.
Kurniawati., Mapiratu., & Ridhay, A. (2015). Kajian ekstrak etanol bunga tanaman johar (cassia siamea l). Sebagai bioindikator asam-basa. Natural Science: Journal of Science and Technology, 4(2), 128-143.
Mahmud, N. R. A., Ihwan., & Jannah, N. (2018). Inventarisasi tanaman berpotensi sebagai indikator asam-basa alami dikota kupang. Bionature, 19(1), 1-7.
Maulika, F., Rizmahardian. A. K., & Kurniasih, D. (2019). Pengembangan media pembelajaran indikator asam-basa alami berbasis bioselulosa. Ar-Razi jurnal Ilmiah, 7(1), 56-64.
Nuryanti, S., Matsjeh, S., Anwar, C., & Raharjo, T. J. (2010). Indikator titrasi asam basa dari ekstrak bunga sepatu (hibiscus rosa sinensis l). AGRITECH, 30(3), 178-183.
Ondagau, D. B., Ridhay, A., & Nurakhirawati. (2018). Karakterisasi pigmen hasil ektraksi air-etanol dari buah senggani (melastoma malabathricum). KOVALEN: Jurnal Riset Kimia, 4(3), 228-236.
Pathade, K. S., Patil, S. B., Kondawar, M. S., Naikwade, N. S., & Magdeum, C. S. (2009). Morus alba fruit-herbal alternative to synthetic acid base indicators. International Journal of ChemTech Research CODEN (USA): IJCRGG, 1(3), 549-551.
Pratiwi, L., Fudholi, A., Martien, R., & Pramono, S. (2016). Ethanol extract, ethyl acetate fraction, and n-heksan fraction mangosteen peels (gracinia mangostana l) as source of bioactive substance free-radical scavengers. Journal of Pharmaceutical Science and Clinical Research, 1(2), 71-82.
Rahmawati, Nuryanti, S. & Ratman. (2016). Indikator asam-basa dari bunga dadap merah (erythrina crista-galli l). Jurnal Akademika Kimia, 5(1), 29-36.
Rein, M. (2005). Copigmentation Reactions and Color Stability of Berry Anthocyanins. Unpublished master’s thesis. Finlandia: University of Helsinki.
Rifkowaty, E. E., Wardanu, A. P. & Hastuti, N. D. (2018). Aktivitas antioksidan dan sirup buah karamunting (rhodomyrtus tomentosa) denganvariasi penambahan asam sitrat. Jurnal Teknologi dan Industri Pertanian Indonesia, 10(1), 16-20.
Talavera, S., Felgines, C., Texier, O., Besson, C., Mazur, A., Lamaison, J., & Remesy, C. (2006). Bioavailability of a bilberryanthocyanin extract and its impact on plasma antioxidant capacity in rats. Journal of the Science of Food and Agriculture, 86(1), 90-97.
Yazid, E. A. (2018). Potensi antosianin dari ekstrak bunga rosella (hibiscus sabdariffa l) Sebagai alternatif indikator titrasi asam-basa. Jurnal Sains, 8(15), 1-7.
Yulfriansyah, A., & Novitriani, K. (2016). Pembuatan indikator bahan alami dari eksrak kulit buah naga (hylocereus polyrhizus) sebagai indikator alternatif asam-basa berdasarkan variasi waktu perendaman. Jurnal kesehatan bakti tunas husada, 16(1), 153-160.
Yusraini, D. I. S. (2009). Pembuatan kertas indikator asam basa dari bunga kembang sepatu (hibiscus rosa-sinensis l). Jurnal Kimia Valensi, 1(5), 246-251.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2025 Wiwit wiwit
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
