The Content of Individual Caffeoylquinic Acids in Edible Vegetables

The presence of 3-, 4-caffeoylquinic acid (CQA) isomers and 3,4-, 3,5-, 4,5-dicaffeoylquinic acid (diCQA) isomers was not detected in the vegetables studied. The content of 5-CQA was then evaluated in 14 edible vegetables. The highest mean value was found in the sweet potato (22.20 mg%). The roots (except for red beet) had mean values for 5-CQA (6.24–22.20 mg%) significantly (P<0.05) higher than those from the fruits (0–4.22 mg%). Conversely, this phenolic acid was not detected in the bulbs studied.