The flavonoids of Equisetum ramosissimum

Phytochemistry
1980.0

Abstract

Equisetum flavonoids have recently received a great deal of attention. The first report was the occurrence of luteolin-5-glucoside and kaempferol-7-diglucoside in E. arvense [1]; several other species have been found to contain flavonol di- and triglycosides [2-5]. In the present study, two subspecies of E. ramosissimum viz; ramosissimum and debile were analysed for flavonoids, the former being widespread throughout Africa, Europe and most of Asia, the latter being restricted to southeast Asia and the southern Pacific Islands [6]. Eleven samples of subspecies ramosissimum, and one sample of subspecies debile all contained kaempferol-3-sophoroside-7-glucoside and lesser amounts of kaempferol-3-sophoroside. No luteolin-5 glucoside was detected. The simplicity and consistency in the flavonoid pattern is noteworthy compared to those of other species studied [3, 5]. The absence of kaempferol-3,7-diglucoside is also noteworthy--since it was consistently present in other species examined [3]. It is interesting to note that all samples studied were identical, although they were from a variety of geographic sources.

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