Adding of anti-browning agents is one of the typical methods
used to inhibit the browning reactions. Treatments with AA, cysteine,
CA and OA were more effective in delaying polyphenol oxidation
in lettuce during storage. Fig. 2 illustrates relative changes
in chlorogenic acid concentration in the presence or absence of
various inhibitors. It was observed that the effectiveness of antibrowning
compounds in reducing polyphenols content diminished
with the length of storage (except for cysteine). These results are in
agreement with our previous findings (Altunkaya & Gökmen,
2008).