Chemical constituents isolated from Mandevilla dardonoi (Apocynaceae)

Mandevilla Lindl. is among the 366 genera belonging to the family Apocynaceae and has about 190 species, of which 66 are reported in Brazil. Phytochemical studies of extracts of the tuberous roots of species of this genus showed different classes of compounds, such as steroids, terpenoids and pregnane glycosides of interesting pharmacological profile, such as in vivo anti-inflammatory activity. Based on this, a phytochemical study of the roots of Mandevilla dardonoi, found in the Northeast region of the country, was carried out . The botanical material was collected in Serra do Jatoba (Serra Branca-Paraiba, 07◦29'00 ''S, 36◦39'54 ), identified by Prof. Dr. Jose Iranildo Miranda de Melo, Department of Biological Sciences, State University of Paraiba and deposited in the Herbarium Manuel de Arruda Câmara (exsicata number 1663). The roots were dried in an air circulation oven at an average temperature of 40 ° C, ground in a mechanical mill and subjected to maceration with 95% EtOH, giving the ethanolic extract of M. dardonoi (EEBMd-303g). The extract was partitioned and 2.8 g of the AcOEt phase were chromatographed on a silica gel 60 column, giving 32 fractions. The fractions 22-30 (35mg) were pooled and subjected to semi-preparative High Performance Liquid Chromatography (mobile phase water acidified with 0.1% formic acid / methanol), from which 6 substances were isolated. Afterwards, the data were analyzed using the following methods: ¹H-NMR (Brucker, 400 MHz, CD3OD) and Mass Spectrometry by Electrospray (Bruker, microTOF II-Ion-Trap AmazonX), which allowed the identification of 6 chlorogenic acids: 3-O-caffeoylquinic acid, 4-O-caffeoylquinic acid, 5-O-caffeoylquinic acid, 3,4-dicaffeoylquinic acid, 4,5- dicaffeoylquinic acid and 5,6- dicaffeoylquinic acid.