The reduced large amount of these compounds on the day 12 control slices may be resulted from polymerization of phenolic compound at RT 35 min (Supplemental Fig. 1 Peak 4). However, on Russet potatoes, no temporal or concentration changes in phenolic acids related to browning of fresh cut potato in tests with CA and browning inhibitors were reported (Ma et al., 2010). The diversity of polyphenols makes their contents in food hard to estimate, including structural diversity, lack of standardized analytical methods and variation of content. The extraction and HPLC method used here not only gives a better estimation of total phenolic content, but also may provide the detail of flavonoids metabolic profile during the browning processing by a small extraction volume and allow a fast detection.