Red sorghum leaf as a novel cheaper natural indicator: Solvent effects on functionality and proposed acid-base mechanisms (original) (raw)

Abstract

Synthetic indicators are considered costly and unfriendly to users and to the environment. Several solvents have been used for extraction and preparation of synthetic and natural indicators. These solvents have been considered toxic and can be very expensive. We have initiated a program aimed at using Sorghum bicolor red leaf extract as a natural indicator and determining the effectiveness of certain solvents in releasing the active ingredient responsible for the color change. Several mechanisms have also been reported or proposed for some natural and synthetic indicators used for simple acid-base titration. However, little is known about this natural indicator. For this present study, the natural indicator was extracted using three different organic solvents and distilled water (which is a non-toxic, universal solvent). The four solvent extracts were tested under different temperature conditions, acid-base strengths and molar strength capacities. The results indicated that all four...

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