The Stability of Extract Indigofera tinctoria for Color Indicator

P. G. Putri, E. Warsiki, Sugiarto

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


Color indicator was one of intelligent packaging that give information to the consumer based on color change. In the manufacture of color indicator.Indigoferatinctoria was used as a source of natural coloring agent.Indigoferatinctorialeafe contains indicanglucoside compound whith indigo color can be hydrolyzed with water to indoxyl which produce blue color. Natural dyes used as color indicator must have a certain stability that is influenced by certain factors such astemperature and pH. In the research extraction of indigo leaves was fermented for 24 hours. The extract was stored at different temperature levels at refrigerator (2 ± 2 °C), room temperature (25 ± 2 °C) and high temperature (40 °C). The effect of pH on the stability of indigo dye extract wascarried out by measuring the absorbance value at pH 1 to 14. The stability of the extract on temperature decreasewith the coefficient of determination of (R2= 0,99) by linear regression of y=0,026x+170 and the stability of extract to pH (R2=0,94) by the equator of y= 0,05x+0,016.

Original languageEnglish
Article number012070
JournalIOP Conference Series: Earth and Environmental Science
Issue number1
Publication statusPublished - 11 Nov 2019
Externally publishedYes
Event6th International Conference on Sustainable Agriculture, Food and Energy: Inclusive Agri-Food Energy Production for Community Empowerment in a Changing Climate, SAFE 2018 - Manila, Philippines
Duration: 18 Oct 201821 Oct 2018


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