Isolation of the Natural Colorant from the Roots of Arnebia nobilis and Its Use as a New Neutralization Indicator.

Indrayan, A. K.; Yadav, Vimla; Kumar, Rajeev; Tyagi, Pradeep K.

doi:10.1002/chin.200516191

Cited by 1 publication

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“…Robert Boyle described how to make an indicator out of rose juice, brazilwood, cochineal, and litmus. 16 Similarly, the juice and pigments of red cabbage (Brassica oleracea, Capitata rosa) 17,18 and tea show varied hues depending on the pH. When tea is steeped in a basic solution, the color darkens, but when lemon juice is added, the color lightens.…”

Section: Natural Indicatorsmentioning

confidence: 99%

Green Indicators-An Ecofriendly Endpoint

Kalakonda

Atla

Puvvada

et al. 2023

Int J. Pharm. Investigation

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Although acid-base titrations can be done using numerous indicators which are either synthetic or semi-synthetic, the investigation was started for natural compounds as the former ones result in polluting the habitat despite their limited availability, complicated method of preparation, and expensiveness. Equivalence point determination is the point of interest in neutralization titrations. With the change in pH, the indicators which are natural, usually end up giving a sharp color change. Plant-derived pigments that are of various shades and tints generally vary in their dyeing nature by altering pH. An indicator is a substance that exhibits the property of interchangeable color of the reaction mixture when reaching the vicinity of point with the change in pH. Acid-base titration indicators are normally weak acids or bases. Hibiscus rosa-sinensis, Ipomoea biloba, Dahlia pinnata, etc. are among the typical neutralization indicators that are extracted from plants. These natural Indicators are easily available and economical. In this review, we are discussing an overview of plant extracts, and natural pH indicators, and their significance in correspondence to analytical chemistry is illustrated.

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Section: Natural Indicatorsmentioning

confidence: 99%