Titrimetric and Polarographic Determination of Carminic Acid and its Quantification in Cochineal (Dactylopius coccus) Extracts
DOI:
https://doi.org/10.29356/jmcs.v55i2.837Keywords:
Carminic acid, acid-basic titration, electrochemical determination, cochineal extract, polarographyAbstract
The purity of synthetic carminic acid was quantified using potentiometric and conductimetric titrations, allowing its use as a secondary standard because there is not a primary one. Polarographic analysis (in ethanol-water 50:50, v/v) of carminic acid showed two reduction signals, each with a different number of electrons. The first reduction had more Nernstian behaviour and can be applied in analyses. Differential pulse polarography (DPP) produced a detection limit of 0.55 μg mL-1. The results indicate that DPP can be used to determine carminic acid content in cochineal extracts.
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