The content of chlorogenic acids in tropical fruits
2002
Pontes, Priscila V. | Moreira, Ricardo F.A. | Trugo, Luiz C. | Maria, Carlos A.B de
This work investigates the content of feruloylquinic (FQA), caffeoylquinic (CQA) and dicaffeoylquinic (diCQA) acids in the peel, pulp and seed of 22 tropical fruits from Brazil. 3-CQA, 4,5-diCQA and 4- and 5-FQA were not detected in any of the fruits analysed. Relatively small amounts of 4-CQA (4.0–48.7 mg kg−1) were found in the peel and/or pulp of seven of the fruits; only the peel of Artocarpus heterophyllus was significantly (p < 0.05) richer in this acid (1000 mg kg−1). The distribution of 3,4- and 3,5-diCQA in different parts of the fruits was relatively poor, only reaching levels of up to 16.4 mg kg−1. The peel of A heterophyllus also showed the highest amount of 5-CQA (13 000 mg kg−1), while the seed of most fruits generally contained a lower amount of this acid than the peel or pulp. On the basis of the 5-CQA content found in the pulp, 15 of the fruits were classified as follows: very low concentration (4.4–15.8 mg kg−1), low concentration (28.9–66.4 mg kg−1), medium concentration (132 mg kg−1), high concentration (473–474 mg kg−1) or very high concentration (1730 mg kg−1); however, no 5-CQA was detected in the pulp of the other seven fruits. Thus 5-CQA was the major chlorogenic acid present in most of the tropical fruits studied and was generally accompanied by small amounts of 4-CQA and 3,4- and 3,5-diCQA.
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