Review Article
Hydroxycinnamic Acid Antioxidants: An Electrochemical Overview
Table 1
Hydroxycinnamic acids and ester derivatives.
| | ā | R1 | R2 | R3 |
| p-Coumaric | H | H | H | Caffeic acid | OH | H | H | 5-Bromocaffeic acid | OH | Br | H | Methyl caffeate | OH | H | CH3 | Ethyl caffeate | OH | H | CH2CH3 | Ethyl 5-bromocaffeate | OH | Br | CH2CH3 | Propyl caffeate | OH | H | CH2CH2CH3 | Butyl caffeate | OH | H | CH2(CH2)2CH3 | Hexyl caffeate | OH | H | CH2(CH2)4CH3 | 3,4,5-Trihydroxycinnamic acid | OH | OH | H | Ethyl 3,4,5-trihydroxycinnamate | OH | OH | CH2CH3 | Ferulic acid | OCH3 | H | H | 5-Bromoferulic acid | OCH3 | Br | H | Methyl ferulate | OCH3 | H | CH3 | Ethyl ferulate | OCH3 | H | CH2CH3 | Ethyl 5-bromoferulate | OCH3 | Br | CH2CH3 | Propyl ferulate | OCH3 | H | CH2CH2CH3 | Butyl ferulate | OCH3 | H | CH2(CH2)2CH3 | Hexyl ferulate | OCH3 | H | CH2(CH2)4CH3 | Sinapic acid | OCH3 | OCH3 | H | Methyl sinapate | OCH3 | OCH3 | CH3 | Ethyl sinapate | OCH3 | OCH3 | CH2CH3 | Propyl sinapate | OCH3 | OCH3 | CH2CH2CH3 | Butyl sinapate | OCH3 | OCH3 | CH2(CH2)2CH3 |
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