A new method for the analysis of anthocyanins in grapes based on a systematic study of the extractability
of eleven anthocyanins from grapes has been developed. Microwave assisted extraction was applied as a
prior stage to the chromatographic determination of anthocyanins in the extracts. The stability of anthocyanins
under the extraction conditions was checked using a standardised extract from grape skins.
Temperatures from 50 C up to 150 C were evaluated. A fractional factorial experimental design was
developed to analyse the influence on the extraction process of six different extraction