Penentuan kadar asam secara titrasi menggunakan indikator pigmen rimpang kunyit

Maria Aloisia Uron Leba

Abstract


Rimpang kunyit (RK) merupakan sumber kurkuminoid, yaitu pigmen kuning yang dapat berubah warna pada pH asam, basa, dan netral. Pigmen rimpang kunyit (PRK) telah banyak dimanfaatkan sebagai pewarna alami makanan, obat tradisional, dan obat herbal. PRK juga telah digunakan sebagai indikator titrasi untuk titrasi larutan asam-basa, namun belum dilaporkan untuk titrasi sampel asam ataupun basa. Dalam penelitian ini, PRK diekstraksi dengan etanol dan digunakan sebagai indikator titrasi untuk penentuan asam dalam sampel. Sampel asam dititrasi dengan larutan standar NaOH dan NH4OH. Berdasarkan penelitian ini, PRK menunjukkan perubahan warna yang jelas pada titik akhir titrasi seperti pada titrasi menggunakan indikator methyl red (MR) dan phenolphthalein (PP). Berdasarkan penelitian ini diperoleh kandungan HCl pada sampel yang dititrasi dengan NaOH menggunakan indikator PRK, MR, dan PP masing-masing adalah 149,98 mg, 149,91 mg, dan 149,91 mg, dan pada titrasi dengan NH4OH menggunakan ketiga indikator yang sama berturut-turut adalah 149,91 mg, 149,98 mg, dan 149,87 mg. Penggunaan PRK sebagai indikator lebih murah, mudah diperoleh, ramah lingkungan, dan mendukung green chemistry jika dibandingkan MR dan PP.

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References


L. Kejla, P. Svoboda, J. Sedlá?ek, and P. Šimá?ek, “Gravimetric titrations in a modern analytical laboratory: evaluation of performance and practicality in everyday use,” Chem Pap., vol. 76, pp. 2051–2058, 2022.

G. Sweta, G. Ashish, S. M. P, V. Durgahati, and S. S, “Investigation of Plant Source As Natural Indicators for Acid Base Titration To Reduce the Use of Harmful Chemicals in Some Extent,” Ijbpas, vol. 7, no. 1, pp. 64–70, 2018, [Online]. Available: https://www.researchgate.net/publication/324570322

P. Sharma et al., “Plant Extracts as Acid Base Indicator: An Overview,” Inven. Rapid Planta Act., vol. 2013, no. 3, pp. 1–3, 2013, [Online]. Available: https://www.researchgate.net/publication/301200786_Plant_extracts_as_acid_base_indicator_an_overview

N. Kapilraj, S. Keerthanan, and M. Sithambaresan, “Natural Plant Extracts as Acid-Base Indicator and Determination of Their pKa Value,” J. Chem., vol. 2019, 2019, doi: 10.1155/2019/2031342.

F. Salvatore and M. M. Salvatore, “An Attractive Way of Developing the Concept of Systematic Titration Error of Visual Acid-Base Titrations (on the Basis of Logarithmic Acid-Base Diagrams),” World J. Chem. Educ., vol. 2, no. 1, pp. 8–20, 2014, doi: 10.12691/wjce-2-1-3.

N. Pattarapongdilok, P. Malichim, N. Simmee, and J. Sichaem, “Natural Indicator for Acid-Base Titration from Thai Yellow Flower Extracts,” Int. J. Chem. Eng. Appl., vol. 10, no. 1, pp. 24–28, 2019, doi: 10.18178/ijcea.2019.10.1.734.

E. Vadivel and S. D. Chipkar, “Eco-Friendly Natural Acid-Base Indicator Properties of Four Flowering Plants from Western Ghats,” Int. J. Pharm. Pharm. Sci., vol. 8, no. 6, pp. 250–252, 2016, [Online]. Available: https://innovareacademics.in/journals/index.php/ijpps/article/view/11555

M. A. U. Leba, F. Komisia, and M. B. Tukan, “Karakter Pigmen Daun Adam Hawa Ungu (Tradescantia pallida) sebagai Indikator pH,” J. Penelit. Sains, vol. 25, no. 2, pp. 174–179, 2023.

A. Falahudin, N. Insin, S. S. Yudha, and M. Adfa, “Green Synthesis of Gold Nanoparticles using Peronema canescens Leaves Extract and Their Catalytic Performance for Dyes and Nitro Compounds,” Melekul, vol. 18, no. 2, pp. 236–242, 2023.

M. A. U. Leba et al., “Exploring Purple Sweet Potato Pigment as An Eco-Friendly Titration Indicator for Acid Determination,” Trop. J. Nat. Prod. Res., vol. 8, no. 6, pp. 7403–7409, 2024.

S. Hadi, A. N. Artanti, Y. Rinanto, and D. S. C. Wahyuni, “Curcuminoid content of Curcuma longa L. and Curcuma xanthorrhiza rhizome based on drying method with NMR and HPLC-UVD,” IOP Conf. Ser. Mater. Sci. Eng., vol. 349, no. 1, 2018, doi: 10.1088/1757-899X/349/1/012058.

T. D. S. F. Fagundes, K. D. B. Dutra, C. M. R. Ribeiro, R. D. A. Epifanio, and A. L. Valverde, “Using a Sequence of Experiments with Turmeric Pigments from Food to Teach Extraction, Distillation, and Thin-Layer Chromatography to Introductory Organic Chemistry Students,” J. Chem. Educ., vol. 93, no. 2, pp. 326–329, 2016, doi: 10.1021/acs.jchemed.5b00138.

S. J. Hewlings and D. S. Kalman, “Curcumin: A review of its effects on human health,” Foods, vol. 6, no. 10, pp. 1–11, 2017, doi: 10.3390/foods6100092.

G. M. Iova et al., “The antioxidant effect of curcumin and rutin on oxidative stress biomarkers in experimentally induced periodontitis in hyperglycemicwistar rats,” Molecules, vol. 26, no. 5, pp. 1–12, 2021, doi: 10.3390/molecules26051332.

A. Bahadori and NG. Maroufi, “Volumetric Acid-Base Titration by using of Natural Indicators and Effects of Solvent and Temperature,” Austin Chromatogr., vol. 3, no. 1, pp. 1041–1044, 2016, [Online]. Available: https://austinpublishinggroup.com/chromatography/fulltext/chromatography-v3-id1041.php

S. H. Burungale and A. V. Mali, “Natural indicator as a eco-friendly in acid base titration,” J. Chem. Pharm. Res., vol. 6, no. 5, pp. 901–903, 2014.

S. ang Supharoek, K. Ponhong, W. Siriangkhawut, and K. Grudpan, “Employing natural reagents from turmeric and lime for acetic acid determination in vinegar sample,” J. Food Drug Anal., vol. 26, no. 2, pp. 583–590, 2018, doi: 10.1016/j.jfda.2017.06.007.

M. A. U. Leba, M. B. Tukan, and F. Komisia, “pH Indicator Paper by Immobilizing Turmeric Rhizome Ethanol Extract on Filter paper,” J. Sains Nat., vol. 12, no. 2, pp. 45–53, 2022, [Online]. Available: https://ejournalunb.ac.id/index.php/JSN/article/view/377

R. Sundari, “Pemanfaatan dan efisiensi kurkumin kunyit (,” vol. 22, no. 8, pp. 595–601, 2016.

G. C. Onuegbu, O. O. Nnorom, and G. O. Onyedika, “Comparative Study on the Acid-Base Indicator Properties of Natural Dye, Turmeric Rhizome (<i>Curcuma longa</i>) and Synthetic Dyes,” J. Text. Sci. Technol., vol. 09, no. 01, pp. 20–29, 2023, doi: 10.4236/jtst.2023.91002.

A. M. Kopon et al., “Aplication of Turmeric Rhizome Pigment as Acid-Base Titration Indicator,” J. Sains Nat., vol. 12, no. 4, pp. 143–152, 2022.




DOI: https://doi.org/10.56064/jps.v26i3.1014

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