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1. (Article ID: 9818)
 
Seshadri V, Batta AK, Rangaswami S
Structure of two new saponins from Achyranthes aspera
Indian Journal of Chemistry 20 (1981) 773-775
 
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2. (Article ID: 9913)
 
Hariharan V, Rangaswami S
Structure of saponins A and B from the seeds of Achyranthes aspera
Phytochemistry 9 (1970) 409-414
 

The structure of Achyranthes saponin A has been established as α-L-rhamnopyranosyl(1→4)-β-D-glucopyranosyl(1→4)-β-D-glucuronopyranosyl(1→3)-oleanolic acid (VI) and that of saponin B as the β-D-galactopyranosyl (1→28) ester of saponin a (VII).

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3. (Article ID: 12326)
 
Kunert O, Haslinger E, Schmid MG, Reiner J, Bucar F, Mulatu E, Abebe D, Debella A
Three saponins, a steroid, and a flavanol glycoside from Achyrantes aspera
Monatshefte für Chemie 131(2) (2000) 195-204
 

Three bisdesmosidic saponins, 20-hydroxyecdysone, and quercetin-3-O-β-D-galactoside were isolated from the methanol extract of the aerial parts of Achyranthes aspera L. (Amaranthaceae). Their structures were established on the basis of NMR spectroscopic analysis; the complete 1H and 13C assignments of the compounds were achieved by means of 2D NMR studies.

NMR spectroscopy, structure elucidation, natural products, saponins

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4. (Article ID: 12480)
 
Michl G, Abebe D, Bucar F, Debella A, Kunert O, Schmid MG, Mulatu E, Haslinger E
New triterpenoid saponins from Achyrantes aspera Linn.
Helvetica Chimica Acta 83(2) (2000) 359-363
 

Two new bisdesmosidic triterpenoid saponins, i.e. 1 and 2, were isolated, besides the three known saponins 3–5, from the MeOH extract of the aerial parts of Achyranthes aspera Linn. (Amaranthaceae). Their structures were elucidated as β-D-glucopyranosyl 3β-[O-α-L-rhamnopyranosyl-(1→3)-O-β-D-glucopyranuronosyloxy]machaerinate (1) and β-D-glucopyranosyl 3β-[O-β-D-galactopyranosyl-(1→2)-O-α-D-glucopyranuronosyloxy]machaerinate (2) by NMR spectroscopy, including 2D-NMR experiments (machaerinic acid=3β,21β-dihydroxyolean-12-en-28-oic acid). The other saponins were identified as β-D-glucopyranosyl 3β[O-α-L-rhamnopyranosyl-(1→3)-O-β-D-glucopyranuronosyloxy]oleanolate (3), β-D-glucopyranosyl 3-β-[O-β-D-galactopyranosyl-(1→2)-O-β-D-glucopyranuronosyloxy]oleanolate (4), and β-D-glucopyranosyl 3β-[O-β-D-glucopyranuronosyloxy]oleanolate (5) (oleanolic acid=3β-hydroxyolean-12-en-28-oic acid).

oleanolic acid, triterpenoid saponins, machaerinic acid, Achyranthes aspera

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