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1. (Article ID: 10471)
 
Sawada H, Miyakoshi M, Isoda S, Ida Y, Shoji J
Saponins from leaves of Acanthopanax sieboldianus
Phytochemistry 34 (1993) 1117-1121
 

Two new triterpenoid saponins named sieboldianoside A and B were isolated from the leaves of Acanthopanax sieboldianus together with five known triterpenoid saponins, kalopanax-saponins A and B, saponin A, CP3, sapindoside B, and a known flavonol glycoside, kaempferol 3-O-rutinoside. On the basis of chemical and spectral evidence, the structures of the new saponins (sieboldianoside A and B) were concluded to be α-L-rhamnopyranosyl(1→4)-β-D-glucopyranosyl(1→6)- β-D-glucopyranosyl esters of hederagenin and oleanolic acid 3-O-β-D- xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α-L-arabinopyranosides, respectively.

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2. (Article ID: 10480)
 
Lin KY, Daniel JR, Whistler RL
Structure of chia seed polysaccharide exudate
Carbohydrate Polymers 23 (1994) 13-18
 
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3. (Article ID: 10481)
 
Chatterton NJ, Harrison PA, Thornley WR, Bennett JH
Structure of fructan oligomers in cheatgrass (Bromus tectorum L.)
New Phytologist 124 (1993) 389-396
 

Leaves of field-grown cheatgrass (Bromus tectorum L.) plants were sampled during early spring when day- and night-time temperatures were relatively cool. Fructan oligomers with a degree of polymerization (DP) 3–6 were extracted and purified using gel and anion-exchange chromatography. The structures of 13 cheatgrass fructans were established. They included two trisaccharides [1-kestotriose (1-kestose) and 6-kestotriose (6-kestose)], four tetrasaccharides [(1.1)-kestotetraose (nystose), (1&6)-kestotetraose (bifurcose), (6,1)-kestotetraose and (6,6)-kestotetraose], three pentasaccharides [(1,1&6)-kestopentaose, (1&6,6)-kestopentaose and (6;1&6)-kestopentaose] plus four hexasaccharides [(1,1,1&6)-kestohexaose (1&6,6,6)-kestohexaose, (6;1&6,6)-kestohexaose and (6;1,6&6)-kestohexaose]. All fructans larger then DP 4 contained a branch point. Each member of the dominant series(1&6)-kestotetraose, (1&6,6)-kestopentaose and (1&6,6,6)-kestohexaose, is a branched fructan in which two fructose moieties are linked to the fructose subunit of each sucrose molecule. Thus the dominant series is built upon (1&6)-kestotetraose. Fructans larger than DP 3 with exclusively 2→1- or 2→6-linkages were absent except for a very small amount of (6,6)-kestotetraose. The unique fructan structures synthesized in cheatgrass, wheat and oats illustrate diversity in the enzymology of fructan biosynthesis among grass species.

synthesis, Structures, fructan, degree of polymerization, Bromus

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