2224 Nakaiirna. Tomida, Hashizume, Takei: Darstelluw und rJahra.89 sierte Tetraacetyl-[~-hydroxy-8thyl]-thioglucurons~ure-methylester wird nach dem Abkuhlen auf -20" abgesaugt, mit wenig kaltem Methanol gewaschen und im Exsiccator uber P,O, getrocknet. Ausb. 13.5 g (62% d.Th.). Zur vollstitndigen Reinigung wird die Substanz aus 7 VoLTln. Methanol umkristallisiert und uber P,O, i. Vak. bei 100" getrocknet. Sie schmilzt bei 132.5'. C,,H240,,S (436.4) Ber. C46.78 H5.55 S 7.35 Gef. C46.87 H5.56 S 7.67 [a]B: -2.69" x 2/0.1159 x 1 = -46.4' (in Chloroform) Die Substanz zeigt die Liislichkeit der Acetyl-thioglucuronide. Sie reduziert Fehlingschc Losung erst nach aaurer Hydrolyse.Nntacetylierung und Esterverseifung wle bei der Methylverbindung fiihrten zu einem amorphen sehr hygroskopischen Sirup, der bisher nicht zur Kristallisation zu bringen war.
Previously, two major sapogenins, barringtogenol C and R1-barrigenol, and one minor sapogenin, camelliagenin A, were isolated by hydrolysing the tea leaf saponin. The main acidic components were shown to be angelic and cinnamic acids.In the present study, another minor sapogenin was isolated and identified as A1-barrigenol. Sugar components of the tea leaf saponin were composed of arabinose, xylose, galactose and glucuronic acid. On the basis of the molecular weight, the leaf saponin was suggested that it consisted chiefly of barringtogenol C and R1-barrigenol, accompanied by 1 mole of cinnamic acid, 1 mole of the mixture of angelic and tiglinic acids, as well as each 1 mole of arabinose, xylose, galactose and glucuronic acid.A crystalline saponin mixture isolated from tea seeds was named "theasaponin" by Aoyama in 1931. As the saponin from tea leaves was different in its structure and properties from the tea seed saponin, a crystalline saponin mixture from the leaf of Thea sinensis L. was named "theafolisaponin."
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