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Naturally derived pH indicators are always been the prime focus in analytical chemistry. Anthocyanins are among them, and their use in acid–base indicator chemistry is generating a lot of interest. The key objective of this study was to assess the feasibility of aqueous electrolyte-based extraction of plant pigment from Syzygium samarangenese and F...
Citations
... The Carissa macrocarpa Fruit extract has been investigated as an eco-friendly acid-base indicator by Ghezal et al. [8]. Recently, Ajay, S., and Krishnan, R.R.et al. reported the acid base indicator activity of anthocyanin extracted from Syzygium samarangenese and Flacourtia jangomas [9]. A little while back Raimundo. ...
... Aqueous and alcoholic PPEx (BP1 and BP2) are found to be the rich source of phyto-constituents like flavonoids (anthocyanin), glycosides, tannins, and polyphenols [22]. The cyanidine 3-glucoside anthocyanin capable to show the color change with pH of solution like acid-base indicator [7,9,10]. ...
... Extraction of pomegranate peel peel extract was dissolved in 10 ml water and ethanol. The buffer solutions of different pH(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) were prepared by using 0.1 M HCl and 0.1 M NaOH. To each of the prepared buffer solutions, 2 drops of PPEx solution was added at room temperature and the color changes were visually observed. ...
Eco-friendly acid base indicators (anthocyanins) are always a center of attention in quantitative volumetric analysis as substitute for synthetic dye indicators. The purpose of the study is to promote utilization of Punica granatum (pomegranate) peel biomass by developing a novel eco-friendly acid–base indicator for titrimetric analysis. Pomegranate peel extract (PPEx) was prepared by ultrasonic probe sonication, a green method for extraction. The obtained extracts were evaluated for total phenol, anthocyanin content and the color change ability analysis (CIEL*a*b* analysis). The pKa of PPEx was determined, the effectiveness of PPEx as indicator was established in different acid–base titrations and compared with conventional synthetic indicators phenolphthalein and methyl orange. The aspirin powder and tablet (Ecosprin) were analyzed by using PPEx as indicator. An attempt was also made to develop PPEx pH indicator paper.
The aqueous and ethanolic PPEx prepared by ultrasonic probe sonication contains 657.1 ± 21 and 718.1 ± 21 mg/LGAE of total phenols and 38.49 ± 0.83 and 42.91 ± 2.10 mgC3G/100gm of anthocyanins, respectively.The PPEx and pH indicator paper shows color change with the pH of solution. The pKa of PPEx was 7.14. PPEx was served as eco-friendly substitute for phenolphthalein and methyl orange indicators. PPEx was effective to analyze aspirin. The statistical analysis ensures the reliability and effectiveness of PPEx as an eco-friendly indicator in acid base titrations as substitute for the synthetic dye indicator.
... Indicators of boat lily leaf extract are similar to the indicators of phenolphthalein. The discoloration that occurs in the extract of boat lily leaves is caused by the presence of anthocyanin compounds whose structure contains flavilium cations (Ajay et al., 2023) in charge of forming anhydrobas when there is a change in pH (Rahmadhia et al., 2023). ...
The acid-base titration experiments at Senior High Schools typically use phenolphthalein and methyl orange indicators, which are relatively expensive and harmful to the environment. One of the plants containing anthocyanin pigments is boat lily (Rhoeo spathaceae (Sw.) Stearn) leaves. The research aims to determine the potential analysis of boat lily leaf extract as an alternative indicator used in chemistry learning in titration acid-base learning. The type of research used in this study is descriptive qualitative. Based on the research and discussion results, the pedagogical aspects carried out by chemistry teachers obtained results that using boat lily leaf extract indicators in acid-base titration in the acid-base chapter is appropriate and meets pedagogical terms to be applied by chemistry teachers. A review of chemistry teachers, laboratory employees, and students obtained results that the use of boat lily leaf extract indicators in acid-base titration in the acid-base chapter can be approved because it meets the aspects of ease to be applied in learning, understanding, and attractive to students, and ease of being provided in the laboratory. Based on the feasibility analysis of potential experiments, boat lily leaf extract is feasible based on financial aspects and shelf life resilience.
