Analysis of individual polyphenolics confirmed spectroscopic observations that pre-heating conditions were instrumental in liberating both anthocyanins and phenolic acid from PSP. Anthocyanins were not preferentially extracted from PSP at any preheating temperature; rather identical chromatograms that only varied in concentration resulted from each extraction. For individual anthocyanins, pre-heating at 30 or 50 C for 10 min resulted in only minor increases in anthocyanin extraction, but pre-heating to 90 C increased the individual monomeric anthocyanins as up as 4.3-fold, in comparison to the non-heated control groups (