Extracts of Lilium sp., Agapanthus sp. and Hydrangea sp.: behavior as natural indicators in different pH range

This experimental activity proposes the use of lily (Lilium sp.), agapanthus (Agapanthus sp.) and hydrangea (Hydrangea sp.) extracts to investigate the colorimetric profile of each extract between pH 1-14. Water, ethanol and ethanol/HCl 1% (w/w) were used as extractive solvents. Among the flowers tested, the extracts of orange lily and burnt yellow lily were the ones that presented the greatest color variation with the solution pH change. In addition, the total content of anthocyanins in relation to cyanidin-3-glycosidic was determined and in ascending order we have: yellow lily (LAM: 0,07 ± 0,03)