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RP-HPLC detection of cinnamaldehyde (a) and a mixture of 5 mg/liter cinnamaldehyde and 50 mg/liter cinnamic alcohol standards (b) at 280 nm using 1% acetic acid in water and 1% acetic acid in methanol as the mobile phase. The cinnamaldehyde retention time was 16.920 min; the cinnamic alcohol retention time was 16.762 min.
