Lonicera japonica
From the leaves of "E. elatior", three caffeoylquinic acids, including chlorogenic acid (CGA), and three flavonoids, quercitrin, isoquercitrin and catechin, have been isolated. Content of CGA was significantly higher than flowers of "Lonicera japonica" (Japanese honeysuckle), the commercial source. A protocol for producing a standardized herbal extract of CGA from leaves of "E. elatior" (40%) has been developed, compared to commercial CGA extracts from honeysuckle flowers (25%).