Treatment of the Teaw extract with 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) caused a similar reduction
in peak area of 55.2–58.1% for chlorogenic acid and the three minor components, indicating that these components had common
structural features. Component 2 was identified as dicaffeoylquinic acid, and compounds 3 and 4 were identified as ferulic acid derivatives.
The radical-scavenging activity of the Teaw extract was compared with a-tocopherol,