Ungernia alkaloids

The review is devoted to the study of the alkaloids of plants of the genusUngernia (Amaryllidaceae). It gives their characteristic reactions and information on the determination of their structures and stereochemistry and on the dynamics of the accumulation of alkaloids in the plants of the genusUngernia. A dependence of the physiological activity of the alkaloids on their structure is shown.     

A polarographic investigation of the alkaloids of Ungernia

Summary In the investigation of the polarographic behavior of nine ungerine alkaloids, it was found that the reduction of narwedine forms the corresponding carbinol, while the reduction of hippeastrine, ungerine, and unsevine forms the corresponding tetrahydro derivatives. The catalytic hydrogen waves that all the ungerine alkaloids form can be used for analytical purposes.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 365–367, May–June, 1976.     

The dynamics of the accumulation and mutual transformation of alkaloids inLiriodendron tulipifera

Summary As the result of a study of the leaves ofLiriodendron tulipifera L. according to the vegetation periods, it has been established that they contain the maximum amount of alkaloids in the spring and early vegetation period of the plant (0.32%) and the minimum amount when they are in the yellowed state in the autumn (0.11%).Transitions from N-methylcrotsparine to lirinidine, from d-caaverine to lirinidine and d-nornuciferine, and from the latter to lysicamine have been established.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 478–481, July–August, 1975.     

Phytoecdysteroids of plants of theSilene genus and the dynamics of their accumulation

The ecdysteroids of four species of the genusSilene L. have been studied. Six ecdysteroids have been isolated and identified, and the dynamics of the accumulation of the ecdysteroids in relation to the phases of development of the plants have been determined.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (3712) 40 64 75. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 718–723, September–October, 1997.     

Polysaccharides of Ungernia. XIV. A mannan from Ungernia trisphaera bulbs

The group carbohydrate composition of the bulbs ofUngernia trisphaera has been studied. The homogeneous ungeromannan-Tr, acetylated in the native state, has been isolated. On the basis of the results of periodate oxidation, methylation, partial hydrolysis, and IR and¹³C NMR spectroscopy, it has been shown that ungeromannan-Tr consists of a linear polymer D-mannopyranose with -(1 4)-glycosidic bonds.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 21–25, January–February, 1986.     

Berberis alkaloids XIV. Dynamics of the accumulation of alkaloids in Berberis oblonga

Andizhan State Medical Institute. Institute of Chemistry of Plant Substances, Uzbekistan Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 597–598, September–October, 1992.