Info

Ginsenoside Rg2

Protopanaxatriol

present

protopanaxatriol saponins, the principal compounds being the oleananes ginsenoside Ro and chikusetsusaponins IV and IVa (Morita et al., 1983). Investigation of rhizomes of P. japonicus C.A.Meyer var. angustifolius (Burk.) Cheng et Chu by Wang et al. (1985) revealed the presence of ginsenosides Rd,

Rg1, Rh 1 and Ro, notoginsenoside Rx, chikusetsusaponins IV and IVa. zingibroside R^ oleanolic acid-28-^-D-glucopyranoside and oleanolic acid-3-^-D-glucuronoside. Wang's team concluded that P. japonicus, P. japonicus var. major and P. japonicus var. angustifolius were chemically so similar as to be one taxa. Another variety, P. japonicus var. bipinnatifidus, was also examined by Wang et al. (1988a). Their results revealed the presence of the chikusetsusaponins V (ginsenoside Ro), IV and IVa, the ginsenosides Rb^ Rd, Re, Rg1 and Rg2, the 24(S)-pseudoginsenoside F11 and the zingibroside R1. The chikusetsusaponins were the dominant saponins present (Table 5.22). Wang et al. (1988b) then examined saponins of the rhizomes of P. japonicus var. major collected in the Qin Ling mountains of Shensi and the Hangduan mountains of Yunnan, China and observed that the dominant saponins were also oleananes (ginsenoside Ro, chikusetsu-saponin IVa, its methyl ester and oleanolic acid-28-O-^-D-glucoside) and the minor glycosides were the dammarane saponins (ginsenosides Re and Rg2 and notoginsenoside R2). In Japan, Morita, Tanaka and Kohda (1985) analysed the saponin composition of P. japonicus rhizomes known locally as satsuma-ninjin and gathered in the southern island of Kyushu. The dammarane saponins ginsenosides Rb^ Rc, Re and Rg!, notoginsenosides Ri and R2 and gypenoside XVII were isolated together with oleanolic acid derived chikusetsusaponin IV and ginsenoside Ro but the authors commented on the apparent absence of chikusetsusaponins Ia and III which had been found in Japanese chikusetsu-ninjin. From rhizomes of daye zhuzisben Peng et al. (1988) also obtained ^-sitosterol-3-O-^-D-glucopyranoside. More recent work by Kanamori et al. (1995a, b) suggested two types of Japanese ginseng rhizome;

Table 5.22. Occurrence of individual saponins in the subterranean structures of P. japonicus species varieties

Designation Prosapogenin Recorded yield per cent var. major. Chinese var. bipinnatifid

Table 5.22. Occurrence of individual saponins in the subterranean structures of P. japonicus species varieties

Designation Prosapogenin Recorded yield per cent var. major. Chinese var. bipinnatifid

Ginsenoside Rb,

Protopanaxadiol

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