Ruppia

Zidorn, Christian, 2016, Secondary metabolites of seagrasses (Alismatales and Potamogetonales; Alismatidae): Chemical diversity, bioactivity, and ecological function, Phytochemistry 124, pp. 5-28 : 16

3.11. Ruppia (7, Cymodoceaceae, salt, alkaline, and brackish waters, in temperate to subtropical zones)

Only one, so far not formally described species of Ruppia , Ruppia aff. tuberosa ( den Hartog and Kuo, 2006) , is considered to be a true seagrass in the ecological sense. However, other species of Ruppia inhabit brackish waters, including nearly fully saline environments. Therefore, records on the phytochemistry of Ruppia are covered here. Harborne and Williams (1976) reported on the occurrence of partially characterized sulfated caffeoyl quinic acid derivatives in Ruppia maritima collected off the coast of Wales. Leaves of R. maritima collected in brackish waters of the Volturno river mouth near Naples/ Italy yielded seven diterpenes 110–116 ( DellaGreca et al., 2000). DellaGreca et al. (2001) reported ten sterols from R. maritima . Besides known compounds 133, 137, 142, 145, 147, 149, 152, and 153, two new trihydroxysterols, (24R)- ergosta-8(14),22diene-3β,6β,7OE- triol 131 and (24R)-ergosta-8,22- diene-3β,6β,7OE- triol 132 were isolated.