Polyphenol

Structure

Recovery (%)

3,4-Dihydroxyphenylacetic acid

32.3

Tyrosol

99.5

Catechol

118.0

4-Hydroxyphenylacetic acid

95.9

Vanillic acid

79.4

Homovanillic acid

117.9

Caffeic acid

74.0

Syringic acid

41.6

p-Coumaric acid

20.2

Sinapic acid

7.6