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Journal articles on the topic 'PH indicators'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Garrett, Jared R., Xinxin Wu, Sha Jin, and Kaiming Ye. "pH-insensitive glucose indicators." Biotechnology Progress 24, no. 5 (2008): 1085–89. http://dx.doi.org/10.1002/btpr.26.

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Fitri*, Camalin Bela Sukmaning, and Retno Aliyatul Fikroh. "The Potential of Clitoria ternatea L. Extracts as an Alternative Indicator in Acid-Base Titration." Jurnal IPA & Pembelajaran IPA 5, no. 4 (2021): 340–52. http://dx.doi.org/10.24815/jipi.v5i4.23183.

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Experiments are an important part of the chemistry curriculum. An indicator in the form of a synthesis indicator is commonly used in acid-base materials experiments. The usage of synthetic indicators can result in waste that is both environmentally harmful and costly. The butterfly pea flower is one of the plants that contains anthocyanins, which have the potential to be used as an alternative indication of natural acids and bases. The study aims to determine the acid and base material curriculum and competency indicators, as well as the potential of butterfly pea flower extract as a substitut

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Salu F S, Salu F. S., Vidya C. S. Vidya C S, Dr Uma Nath U. Dr. Uma Nath U, Athira A. S. Athira A S, Dr R. Xavier Arulappa, and Dr Prasobh G. R. Dr. Prasobh G R. "Review on Natural Ph Indicators." International Journal of Pharmaceutical Research and Applications 10, no. 1 (2025): 859–65. https://doi.org/10.35629/4494-1001859865.

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Materials from fruits, plants, or other natural sources that change color in response to pH differences are known as natural pH indicators. These indicators are non-toxic, economical, and environmentally beneficial substitutes for artificial pH indicators. Natural sources that include anthocyanins, curcumin, and other pigments that change color based on the acidity or alkalinity of the solution include hibiscus, butterfly pea flowers, pomegranates, red onions, dragon fruit, grapes, red cabbage, turmeric, and beetroot. Because of their ease of use and accessibility, natural pH indicators are fr

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4

Han, Junyan, and Kevin Burgess. "Fluorescent Indicators for Intracellular pH." Chemical Reviews 110, no. 5 (2010): 2709–28. http://dx.doi.org/10.1021/cr900249z.

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Jang, Ji-Sung, and Sung-Hoon Kwon. "Micro pH Sensor Using Patterned Hydrogel with pH Indicators." Journal of Sensor Science and Technology 20, no. 4 (2011): 234–37. http://dx.doi.org/10.5369/jsst.2011.20.4.234.

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Simonyan, Tatiana R., Anastasia V. Mamontova, Konstantin A. Lukyanov, and Alexey M. Bogdanov. "FLIM Indicators for Quantitative Measurement of pH." Engineering Proceedings 6, no. 1 (2021): 33. http://dx.doi.org/10.3390/i3s2021dresden-10144.

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Monitoring of intracellular pH changes in situ can provide valuable information about cellular metabolism and a deeper understanding of physiological processes. Most traditional fluorescent indicators are only capable of a relative assessment of changes in the studied parameter in the cell. We associate the possibility of measuring the absolute values that characterize the analyte with the detection of the indicator signal in the time domain, where its quantitative measure is the fluorescence lifetime (tau). In this project, we test promising pH-sensitive fluorophores with labile fluorescence

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Tuslinah, Lilis, Anna Yuliana, Dian Arisnawati, and Lina Rahmawati Rizkuloh. "Comparison of Color Change to pH Range and Acid-Base Titration Indicator Precision Test of Multiple Ethanol Extracts." Trends in Sciences 19, no. 1 (2021): 1446. http://dx.doi.org/10.48048/tis.2022.1446.

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Natural indicators using anthocyanin compounds can be an alternative to synthetic indicators on acid-base titration because anthocyanin is an organic compound that is unstable with changes in pH. The extraction was carried out with ethanol because the compounds of anthocyanin were polar. This study was to ensure an ethanol extract of some plants could be used as an acid-base indicator that had a pH range of color change and the value of the equality parameter was not significantly different from the phenolphthalein indicator. The research method is to collect research journals on making natura

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de Silva, A. Prasanna, Saliya A. de Silva, Aruna S. Dissanayake, and K. R. A. Samankumara Sandanayake. "Compartmental fluorescent pH indicators with nearly complete predictability of indicator parameters; molecular engineering of pH sensors." Journal of the Chemical Society, Chemical Communications, no. 15 (1989): 1054. http://dx.doi.org/10.1039/c39890001054.

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9

Al-Husseini, Zaid Noor Obaid. "A Literature Review on the Indicators in Precipitation." American International Journal of Sciences and Engineering Research 2, no. 1 (2019): 1–8. http://dx.doi.org/10.46545/aijser.v2i1.26.

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Our literature includes information and explanation for indicators in chemical reactions and principle of its using which represented by (types of indicators ,pH of indicators , instrumental precipitation,…) , principles of precipitation by indicator , methods of precipitation by indicator ,types of indicators for precipitation, conditions of precipitation.

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Patel, Harsh, Sudarshan Seshadri, and J. R. Parvathi. "Edible Bioplastic with Natural pH Indicators." International Journal of Current Microbiology and Applied Sciences 6, no. 7 (2017): 1569–72. http://dx.doi.org/10.20546/ijcmas.2017.607.188.

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Miltsov, Serguei, Cristina Encinas, and Julián Alonso. "Nortricarbocyanines: New near-infrared pH-indicators." Tetrahedron Letters 39, no. 50 (1998): 9253–54. http://dx.doi.org/10.1016/s0040-4039(98)02078-4.

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12

Baryshnikova, Olga K., Thomas C. Williams, and Brian D. Sykes. "Internal pH indicators for biomolecular NMR." Journal of Biomolecular NMR 41, no. 1 (2008): 5–7. http://dx.doi.org/10.1007/s10858-008-9234-6.

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13

Pandit, Gitanjali, Krishna Satasiya, Pooja Khanpara, and Dr Shital Faldu. "Herbs as a natural pH indicators." Journal of Pharmacognosy and Phytochemistry 12, no. 6 (2023): 01–04. http://dx.doi.org/10.22271/phyto.2023.v12.i6a.14759.

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Amorim, Lúcia F. A., Ana P. Gomes, and Isabel C. Gouveia. "Design and Preparation of a Biobased Colorimetric pH Indicator from Cellulose and Pigments of Bacterial Origin, for Potential Application as Smart Food Packaging." Polymers 14, no. 18 (2022): 3869. http://dx.doi.org/10.3390/polym14183869.

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Nowadays, worldwide challenges such as global warming, pollution, unsustainable consumption patterns, and scarcity of natural resources are key drivers toward future-oriented bioeconomy strategies, which rely on renewable biobased resources, such as bacterial pigments and bacterial cellulose (BC), for materials production. Therefore, the purpose of this study was to functionalize bacterial cellulose with violacein, flexirubin-type pigment, and prodigiosin and test their suitability as pH indicators, due to the pigments’ sensitivity to pH alterations. The screening of the most suitable conditio

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PALAK, Handan, and Burçak KARAGÜZEL KAYAOĞLU. "DESIGN AND DEVELOPMENT OF POLYLACTIDE BASED NANOFIBROUS pH INDICATOR." Tekstil ve Mühendis 29, no. 128 (2022): 286–90. http://dx.doi.org/10.7216/teksmuh.1222518.

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In this study, a colorimetric pH indicator was developed using nanofibrous mats of polylactide (PLA) including turmeric, a natural dye. Firstly, nanofibrous mats were produced by dissolving PLA at different concentrations in chloroform (CHL)/dimethylformamide (DMF) at various volume ratios, and morphological analysis was performed. Subsequently, turmeric was added at a concentration of 2% wt. to the polymer solution having a PLA concentration of 10% in 75/25 CHL/DMF, and nanofibrous pH indicators were produced. Then, pH indicators containing turmeric were immersed into pH buffer solutions (pH

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Kalyan, Pandey, Giri Pankaj, Patra Rabindranath, Kumar Bhattacharya Swapan, and B. Saba M. "Syntheses of 2-carboxy-2', 4' -diamino azo benzene and 2-nitro-2' -hydroxy-4'methyl azo benzene and their use as acid-base indicators." Journal of Indian Chemical Society Vol. 84, Mar 2007 (2007): 256–59. https://doi.org/10.5281/zenodo.5816452.

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Department of Chemistry, Jadavpur University, Kolkata-700 032, India <em>E-mail </em>: skbhatt7@yahoo.co.in <em>Manuscnpt received 13 December 2004, revised 9 January 2007, accepted 10 January 2007</em> The present paper describes the studies on acid-base characteristics of two synthesized novel azo-dyes. The isosbestic points and apparent pK<sub>1n</sub> values of them have been determined spectrophotometrically. These dyes can be used as pH indicators for estimation of strength of the mixtures of acids, bases and salts. The parameters measuring the performance of indicators have been also ev

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Nandkumar, M. Chaudhari* Suraj D. Bendre Savil V. Deshmukh Ashish S. Kumbhakarn Vaishnavi S. Jondhale. "Acid Base Indicator Paper Extracted From Rose And Hibiscus Flower." International Journal of Pharmaceutical Sciences 2, no. 10 (2024): 1712–20. https://doi.org/10.5281/zenodo.14006458.

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This study explores the preparation and application of acid-base indicator paper extracted from rose and hibiscus flowers, utilizing their natural pigments, primarily anthocyanins, as pH indicators. The process involves steeping the petals of these flowers in water to extract the vibrant colorants, which are then absorbed onto filter paper, resulting in a functional indicator tool. The paper’s performance is evaluated across a range of pH levels, demonstrating a marked color change that correlates with acidity and alkalinity: red or pink in acidic solutions, purple in neutral, and blue o

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B., V. Shilpa* K. Nikitha N. Geethika Krishna K. Sindhu S. Neha Ch. Anusha. "Plant Extracts as Herbal Indicators." International Journal of Pharmaceutical Sciences 3, no. 3 (2025): 2465–71. https://doi.org/10.5281/zenodo.15084019.

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When the pH of the solution is altered by adding acid or alkali, indicators—which are highly specific compounds—will cause the solution's color to change. Red cabbage's actual color is blue. It will be somewhat blue after cutting it up and adding some tap water, but it will turn red when vinegar is added. This is because the color in red cabbage acts as a pH sensor. The aim of this study is to examine the possibility of using extracts of flower pigments in place of synthetic indicators. Synthetic indicators are costly, problematic in terms of supply, and hazardous chemically. An es

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Vambhurkar, G., A. Jagtap, A. Gavade, et al. "ETHANOLIC EXTRACT OF ARISTOLOCHIA BRACTEOLATA FLOWER AS A NATURAL INDICATOR FOR ACID-BASE TITRATION." INDIAN DRUGS 56, no. 03 (2019): 77–79. http://dx.doi.org/10.53879/id.56.03.11502.

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In acid-base titration or acid-base neutralization reaction the change in color due to change pH of the solution is caused due to a third substance which is termed as acid-base indicator or pH indicator. Every indicator shows different range of colors at different pH ranges. Synthetic indicators have been widely employed as indicators in acid-base titrations; however, due to environmental pollution, availability and cost, natural compounds are best alternates. Natural pigments in plants are highly colored substances and may show sharp color changes with variation in pH. In the present study an

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Shital Kalekar, Shital Kalekar, Ms Shraddha Pote Ms. Shraddha Pote, Ms Payal Ambhore Ms. Payal Ambhore, Ms Anushka Dandekar Ms Anushka Dandekar, Deepak Markhelkar Deepak Markhelkar, and Mr Akshay Shinde Mr. Akshay Shinde. "Herbs as Natural Ph Indicator." International Journal of Pharmaceutical Research and Applications 10, no. 2 (2025): 1488–98. https://doi.org/10.35629/4494-100214881498.

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The quest for sustainable, ecofriendly, and cost-effective alternatives to synthetic chemicals has sparked renewed interest in natural products, particularly in analytical applications. This review highlights the potential of herbs as natural pH indicators, offering a green alternative to synthetic dyes traditionally used in acid-base titrations and pH detection. Various herbs contain naturally occurring pigments such as anthocyanins, flavonoids, and betalains, which exhibit visible color changes over a range of pH values. This manuscript systematically explores the phytochemical basis of thes

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21

Esterlin, Euis Nursaadah, Rendy W. Wardana, and M. Lutfi Firdaus. "The Use of Telang Flower Extract (Clitoria ternatea L.) as a Natural Universal pH Indicator coupled with Digital Image Colorimetry." PENDIPA Journal of Science Education 8, no. 3 (2024): 480–87. https://doi.org/10.33369/pendipa.8.3.480-487.

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The acid base indicators commonly used by scientists are mostly synthetic indicators that are harmful for the environment.Moreover, chemists need various chemicals to detect broad pH ranges for acid and base samples solution. The aim of this research was to create a natural universal pH indicator from telang flower (Clitoria ternatea L.) extract coupled with the digital image detection. The universal pH indicator is very important in education chemistry that broadly used for titration and other class room chemical experiments. This process of making a natural universal pH indicator integrated

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Jabeen, Mussarat, Kainat Tariq, Atiya Rehman, Noreen Aslam, Anas M. Zafar, and Syed Ubaid Hussain. "Evaluation of Improvised and Eco-Friendly Natural pH-Paper Indicators." FRONTIERS IN CHEMICAL SCIENCES 3, no. 2 (2022): 22–31. http://dx.doi.org/10.52700/fcs.v3i2.58.

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A substance that changes color when pH changes is referred to as an indicator. Synthetic indicators, which are expensive and toxic, are currently the best option for estimating acid-base concentrations or hydronium and hydroxide ion concentrations. This study aims to prepare pH paper indicators from natural sources to overcome this problem. Indicator strips of this type are eco-friendly, cheap, durable, non-toxic, biodegradable, and easy to prepare even at home. In this application, we are using natural sources such as turmeric (Curcuma longa), rose (Rosa Indica), beetroot (Beta vulgaris), and

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Rahmawati, Rahmawati, Siti Nuryanti, and Ratman Ratman. "Indikator Asam-Basa dari Bunga Dadap Merah (Erythrina crista-galliL.)." Jurnal Akademika Kimia 5, no. 1 (2017): 29. http://dx.doi.org/10.22487/j24775185.2016.v5.i1.7997.

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Dadap red (erythrina crista-galli L.) is belonged to the legumes (fabaceaea) family which, is one of the flowering shade plants that often used as an ornamental plant. This plant has a bright red flower, a taproot with root nodule bacteria nitrogen fixation and compound leaf consists three strands on each stem. This research is climed to proves that the extract of dadap red flower can be used as acid-base indicators. Dadap red flowers was macerated using methanol then filtered. The filtrate was ready to use as an acid-base indicator. The extract is tested in an acid-base, buffer solutions, and

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Gabor, Gabriella, Suneet Chadha, and David R. Walt. "Sensitivity enhancement of fluorescent pH indicators using pH-dependent energy transfer." Analytica Chimica Acta 313, no. 1-2 (1995): 131–37. http://dx.doi.org/10.1016/0003-2670(95)00248-x.

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Miss.Harshal, Chavan* Prutha Shirodkar A. S. Dhake Dr. A.G.Jadhav. "NATURAL INDICATORS AS ALTERNATIVE TO SYNTHETIC ACID BASE INDICATORS." Indo American Journal of Pharmaceutical Sciences 04, no. 11 (2017): 4078–82. https://doi.org/10.5281/zenodo.1048226.

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In acid-base titrations, indicators are used to show sharp color change at intervals of pH. Natural pigments in plants are highly colored substances and may show color change with variation of pH. An attempt has been made to investigate the indicator activity of flower pigments and to replace synthetic indicators as they have certain disadvantage like chemical pollution, availability problems and high cost. Alcoholic extract of Hibiscus rosasinensis, Calotropis gingantia, Brassica oleracea-capitata, Rosa chinensis, Brassica oleracea-italica, Ixora chinensis, Cantharanthus roseus gives sharp in

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Kapuka, Gius, Solichatul Firdaus, and Siti Anisa. "OBSERVASI PH ALAMI BEBERAPA SAMPEL BUNGA DAN TANAMAN DI KAMPUS UNIVERSITAS WIJAYA KUSUMA SURABAYA." Journal of Natural Sciences and Learning 3, no. 1 (2024): 33–38. http://dx.doi.org/10.30742/jnsl.v3i1.134.

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The purpose of this study was to observe the acid-base pH of several samples of flowers and plants around the campus. To recognize acids and bases is usually by using indicators. The purpose of acid-base indicator analysis is to measure acid-base reactions. This usually requires the use of indicators or tools such as litmus paper, pH indicator paper, and electrodes for acids and bases. Indicators were extracted from Allamanda flower plants, Bougainvillea flowers, and Dracaena reflexa plants using solvents (water) and alcohol. The method used in this study is the practicum method and literature

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Pagariya, R. F. "GREEN CHEMISTRY: ROSELLE’S COROLLA EXTRACT AS A SUBSTITUTE FOR HAZARDOUS INTERNAL INDICATORS IN VOLUMETRIC ANALYSIS." International Journal of Research -GRANTHAALAYAH 7, no. 9 (2019): 118–22. http://dx.doi.org/10.29121/granthaalayah.v7.i9.2019.567.

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Indicators used in acid-base titration show well marked changes of colour in certain intervals of pH. Most of these indicators are organic dyes and are of synthetic origin. Today synthetic indicators are the choice of neutralization titrations. But due to environmental pollution, availability and cost, the search for natural compounds as an acid-base indicator was started. The present work highlights the use of the ethanolic extract of the corolla of Roselle (Hibiscus sabdariffa) as a pH indicator in strong acid-strong base, strong acid weak base, weak acid strong base and weak acid-weak base

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Dr., R. F. Pagariya. "GREEN CHEMISTRY: ROSELLE'S COROLLA EXTRACT AS A SUBSTITUTE FOR HAZARDOUS INTERNAL INDICATORS IN VOLUMETRIC ANALYSIS." International Journal of Research - Granthaalayah 7, no. 9 (2019): 118–22. https://doi.org/10.5281/zenodo.3464396.

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Indicators used in acid-base titration show well marked changes of colour in certain intervals of pH. Most of these indicators are organic dyes and are of synthetic origin. Today synthetic indicators are the choice of neutralization titrations. But due to environmental pollution, availability and cost, the search for natural compounds as an acid-base indicator was started. The present work highlights the use of the ethanolic extract of the corolla of Roselle (Hibiscus sabdariffa) as a pH indicator in strong acid-strong base, strong acid weak base, weak acid strong base and weak acid-weak base

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Urbanczyk-Lipkowska, Zofia, and Przemysław Kalicki. "pH indicators - molecular structure and proton distribution." Acta Crystallographica Section A Foundations of Crystallography 65, a1 (2009): s249. http://dx.doi.org/10.1107/s0108767309094811.

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Deutsch, C. J., and J. S. Taylor. "New class of 19F pH indicators: fluoroanilines." Biophysical Journal 55, no. 4 (1989): 799–804. http://dx.doi.org/10.1016/s0006-3495(89)82879-6.

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Robert, London, A. Levy Louis, and K. Rhee Chung. "5639906 Fluorescent and NMR sensitive Ph indicators." Magnetic Resonance Imaging 15, no. 10 (1997): IX. http://dx.doi.org/10.1016/s0730-725x(97)80838-7.

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Nourmohammadian, Farahnaz, Mahnaz Davoodzadeh, and Abdol-Ali Alizadeh. "New cyclopentadiene derivatives as novel pH indicators." Dyes and Pigments 74, no. 3 (2007): 741–43. http://dx.doi.org/10.1016/j.dyepig.2006.05.011.

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Aime, Silvio, Mauro Botta, Luciano Milone, and Enzo Terreno. "Paramagnetic complexes as novel NMR pH indicators." Chemical Communications, no. 11 (1996): 1265. http://dx.doi.org/10.1039/cc9960001265.

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Motturi, Heli, Sari Slawuta, Sirpa Salkunen, and Petra Rajala. "Plant pigments as pH indicators in cooking." Lumat: International Journal of Math, Science and Technology Education 1, no. 2 (2013): 209–18. http://dx.doi.org/10.31129/lumat.v1i2.1116.

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Controlling acidity comes up often during cooking. Food’s acidity can be discussed in connection to using vinegar, marinade or baking soda in cooking. One seldom considers that acidity affects the food’s colour and thus its appeal. Colour is especially significant for ready-made foods. Berry jam or juice that is too pale or too dark does not look fresh or appealing. Many of the foods that lose their colour easily contain nature’s own pH indicators, anthocyanins. The workshop detailed in this article explores discolouration of anthocyanins with the help of different methods. Anthocyanins

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Sajin, Kattuvilakam Abbas, G. Pillai Preeja, and P. Iyer Pavithra. "A Study on Acid – Base Indicator Property of Flowers of Impatiens Balsamina." Pharmaceutical and Chemical Journal 5, no. 5 (2018): 88–92. https://doi.org/10.5281/zenodo.13925422.

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Indicators are used to determine the equivalence point in acid – base titrations (neutralization titrations). They exhibit sharp color change with respect to change in pH. Popularly used indicators for neutralization titrations are synthetic chemicals. They are found to have hazardous effects in human body. The highly colored pigments obtained from plants are found to exhibit color changes with variation in pH. A study was done to check the indicator action of aqueous extract of flower pigments and compared with that of already existing synthetic indicators. Extraction was done using hot

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Teixeira, Fernando. "Determining the relative importance of climate and soil properties affecting the scores of visual soil quality indicators with dominance analysis." AIMS Geosciences 10, no. 1 (2024): 107–25. http://dx.doi.org/10.3934/geosci.2024007.

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<abstract> <p>In this study, we have analyzed the relationships of four manageable soil properties, soil texture, and climate variables on the scores of visual indicators of 132 soils across Europe and China. Correlations differed in acid-to-neutral and alkaline soils, both in strength and direction, which gave rise to the different rankings of the importances of the explanatory variables for each visual indicator. In alkaline soils, higher soil pH values significantly affected the score of the visual indicators and dominated other variables for most visual indicators; in acid soil

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Dixit, Sushil S., Aruna S. Dixit, and R. Douglas Evans. "Scaled Chrysophytes (Chrysophyceae) as Indicators of pH in Sudbury, Ontario, Lakes." Canadian Journal of Fisheries and Aquatic Sciences 45, no. 8 (1988): 1411–21. http://dx.doi.org/10.1139/f88-165.

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Surface sediment chrysophytes (Chrysophyceae) of 30 Sudbury, Ontario, lakes were analyzed to investigate the relationship of these algal microfossils with the limnological characteristics of the study lakes. The distribution of the majority of common chrysophyte taxa is correlated closely with lake water pH, pH-related factors, or both. Chrysodidymus synuroideus, Synura echinulata, Mallomonas hamata, M. acaroides var. muskokana, and Chrysosphaerella longispina appear to be indicators of strongly to moderately acidic waters whereas M. pseudocoronata and M. caudata are indicators of circumneutra

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King, D. Whitney, and Dana R. Kester. "Spectral Modeling of Sulfonephthalein Indicators: Application to pH Measurements Using Multiple Indicators." Applied Spectroscopy 44, no. 4 (1990): 722–27. http://dx.doi.org/10.1366/0003702904087578.

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Ahn, Kyujin, Yeseul Doo, and Yeonseok Koh. "Feasibility Study on Fast Determination of pH of Paper Using pH Indicators." Journal of Korea Technical Association of the Pulp and Paper Industry 50, no. 3 (2018): 19–27. http://dx.doi.org/10.7584/jktappi.2018.06.50.3.19.

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Wolfbeis, Otto S., and Harry Marhold. "A new group of fluorescent pH-indicators for an extended pH-range." Fresenius' Zeitschrift für analytische Chemie 327, no. 3-4 (1987): 347–50. http://dx.doi.org/10.1007/bf00491840.

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Sukemi, Sukemi, Usman Usman, Boyfanie Ivan Putra, Widya Purwati, Nindy Nur Rahmawati, and Sela Defi Alib Pradani. "Acid Base Indicator from Shoot-Leaves Ethanol Extract of Pucuk Merah (Syzygium oleana)." JKPK (Jurnal Kimia dan Pendidikan Kimia) 2, no. 3 (2018): 139. http://dx.doi.org/10.20961/jkpk.v2i3.11864.

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Experiment on natural acid-base indicators is usually done by extracting the natural sources with certain solvent, testing the extract with acid, base and neutral solutions, observing the color changes, making conclusion and discharging the remaining extract at the end of the experiment. Production of long-lasting natural acid-base indicator is needed to reduce the discharged of chemicals excessively. This research was carried out to produce natural acid-base indicator from extract of shoot leaves of <em>Syzygium oleana</em> (SLS). The extraction was done by maceration technique us

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Ningtyas, Rina, Marsha Namira Jayarachman, Saeful Imam, and Muryeti. "The Use of Colour Indicator as a Smart Packaging for Monitoring Spoilage Fillet Catin Fish (Pangasius Sp.) In Room Temperature." IOP Conference Series: Earth and Environmental Science 1177, no. 1 (2023): 012048. http://dx.doi.org/10.1088/1755-1315/1177/1/012048.

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Abstract The purpose of this research was to manufacture smart packaging made from pH color indicators Methyl Orange (MO), Methyl Red (MR), and Bromocressol Green (BCG) and analyze the best indicators in responding to the decline of quality fillet of Pangasius spp. Sensitivity indicators were tested with simulated gas amin issued by NH4OH for 30 minutes. They tested the color change of indicator in field trials conducted with sensitivity to the decline of quality fillet fish Pangasius sp. every 3 hours for 15 hours. Further tests were done on the fish to find the time of fish freshness with th

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Salu F S*, Salu F. S*, Vidya C. S. Vidya C S, Dr Uma Nath U. Dr. Uma Nath U, Athira A. S. Athira A S, Dr R. Xavier Arulappa, and Dr Prasobh G. R. Dr. Prasobh G R. "Assessing the Efficacy of Anthocyanin Based Natural Ph Indicator against Phenolphthalein." International Journal of Pharmaceutical Research and Applications 10, no. 1 (2025): 1552–58. https://doi.org/10.35629/4494-100115521558.

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The color of acid-base indicators changes when the medium's pH changes, and the extracts of different plants exhibit sharp color changes when the reacting medium's pH changes. Because synthetic acid base indicators have some drawbacks, such as a difficult manufacturing process, high cost, and the potential to pollute the environment or injure users, a study has been conducted to replace them with natural extract. To find out their indicator activity, Hibiscus, Butterfly pea flower, Pomegranate, Red onion, Grape, and Dragon fruit extracts are compared to phenolphthalein indicator. Four differen

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Yanti, N. R., M. Andika, S. Maulida, Riani, I. Sulaiman, and N. M. Erfiza. "Utilization of areca nut (Arecha chatechu L.) extract for tannin based colorimetric indicator in smart packaging." IOP Conference Series: Earth and Environmental Science 951, no. 1 (2022): 012057. http://dx.doi.org/10.1088/1755-1315/951/1/012057.

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Abstract Areca nut contains tannin which has a great potential to apply as natural colour agent in food industries. Tannin offers specific colour and alter its colour due to environmental sensitivity. This study aims to fabricate a tannin-based colour indicator from areca nut in smart packaging in the form of a strip type and to characterize the indicator at different storage conditions and at various pH solutions. The indicators were synthesized using filter paper (No.1 and No.42) soaked in a solution with 1, 3, and 5% areca nut ethanolic extract. Then the indicators were stored at room tempe

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Zajíc, Jakub, Lenka Traplová, Vlastimil Matějec, Marie Pospíšilová, and Ivo Bartoň. "Optical pH Detection with U-Shaped Fiber-Optic Probes and Absorption Transducers." Conference Papers in Science 2015 (March 12, 2015): 1–8. http://dx.doi.org/10.1155/2015/513621.

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In medicine knowledge of pH values can provide us with information not only about the patients’ status but also about physiological processes in the patient’s body. Measurements of pH in small-sample volumes and online pH monitoring in vivo can be employed to obtain such information. For such measurements we have developed and investigated U-shaped fiber-optic probes with immobilized pH indicators in this paper. U-shaped probes with a diameter of about 2 mm were prepared. Three different pH indicators, methyl red, methyl orange, and bromothymol blue, were immobilized in two types of matrices,

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Langhals, Heinz, and Tim Pust. "Fluorescent Nano pH Indicators Based on Supramolecular Interactions." Zeitschrift für Naturforschung B 65, no. 3 (2010): 291–94. http://dx.doi.org/10.1515/znb-2010-0310.

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Lipophilic pH-sensitive perylene derivatives were combined with detergents in a supramolecular arrangement to obtain nanomicelles that can be applied as fluorescent pH indicators for the aqueous phase.

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Rendi, Andi M., Supriadi Supriadi, and Suherman Suherman. "Flower Extracts of Cage Plants (Canavalia virosa) as an Indicator of Acid Base." Jurnal Akademika Kimia 9, no. 4 (2020): 191–98. http://dx.doi.org/10.22487/j24775185.2020.v9.i4.pp191-198.

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Cage plants (Canavalia virosa) are classified as nuts. This study aims to prove the flowers of the cage plants as acid-base indicators and determine the type of acid-base titration that is suitable for indicators of cage plants. The flowers of the cage plants were macerated with ethanol. Extras were tested as indicators in acid-base solutions, buffer solutions, and compared with phenolphthalein and methyl orange for acid-base titration, namely: strong acid with a strong base, a weak acid with a strong base, and weak base with strong acid. The results obtained in this study, namely: flower extr

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Funnekotter, Bryn, Ricardo L. Mancera, and Eric Bunn. "A Simple but Effective Combination of pH Indicators for Plant Tissue Culture." Plants 12, no. 4 (2023): 740. http://dx.doi.org/10.3390/plants12040740.

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The use of pH indicators provides a simple, semi-quantitative visual method for quickly assessing pH changes in tissue culture media; however, pH indicators are rarely used in routine plant tissue culture media. In this study, chlorophenol red, bromocresol purple, and bromocresol green were tested to assess their functionality in the growth medium for plant shoot cultures. In addition, a combination of bromocresol green and bromocresol purple was tested to determine if they would widen the observable colour change to better assess pH changes in the medium. Varying the ratio of bromocresol gree

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Cardwell, TJ, RW Cattrall, LW Deady, M. Dorkos, AJ Kaye, and A. Papanikos. "Cellulose Acetate-Based pH Indicator Optodes." Australian Journal of Chemistry 48, no. 6 (1995): 1081. http://dx.doi.org/10.1071/ch9951081.

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Some pH indicators for use in optode membranes based on cellulose acetate have been prepared, and applications of membranes containing octyl bis (2,4-dinitrophenyl)acetate in static and flowing systems are discussed.

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KA, Sajin, Anoobkumar KI, and Rasa OK. "pH Indicators: A Valuable Gift for Analytical Chemistry." Saudi Journal of Medical and Pharmaceutical Sciences 06, no. 05 (2020): 393–400. http://dx.doi.org/10.36348/sjmps.2020.v06i05.001.

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