HERBAL INDICATORS AS AN UPCOMING TREND IN TITREMETRIC ANALYSIS
Journal Title: International Research Journal of Pharmacy (IRJP) - Year 2011, Vol 2, Issue 4
Abstract
Indicators are very special chemicals, they will change color of the solution with change in pH by adding acid or alkali. Red cabbage is actually blue in color. It will be quite blue when slice it up and add some tap water but if we add some vinegar it will turn red. This is due to the pigment present in red cabbage which acts as pH indicator. The aim of this study is to investigate the activity of flower pigments extracts to replace the synthetic indicators. Synthetic indicator produces chemical hazards, availability problem and having high cost. Methanolic extract of Antirrhinum majus belonging to the family Scrophulariaceae and Dianthus plumaris belonging to family Caryophyllaceae give sharp and intense color change as compared to phenolphthalein and methyl orange.Herbal indicators are evaluated by different acids and bases. In all these titrations the extract was found to be accurate and useful for indicating the end point (neutralization point). Phytochemical investigation and chemical test of Antirrhinum majus and Dianthus plumaris shows presence of anthocyanins which are related to the class of flavanoids and may be the main reason for its activity as an indicator. From these investigation new theories of indicators could be established.
Authors and Affiliations
Jaspreet Sidana , Kanika Arora , Parminder Nain , Geeta Deswal
Keywords
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