Phone: 972-8-6596891

Fax: 972-8-6596757

E - mail: yellena@bgu.ac.il

Born: Former USSR

 

Academic Qualifications:

  1. Ph.D. 1977, Lomonsov Institute of Fine Chemical Technology
  2. Researcher 1992

 

Academic Positions:

Wyler Department of Dryland Agriculture - Research Grade C

 

Research Interests:

Experience of work in the chemistry purine nucleoside, nucleoside-coferments; vitamin B12 and B15 and its derivatives; bio-organic and organometallic chemistry;complexes of palladium with nucleoside coferments; halogentriphosphoranes; Synthesis of dimethylglycyl-D-glucose derivatives (sugars); complexes of palladium - anti-cancer activity; Composition and structure of substances obtained from sclareol for cosmetics;Taxonomic examination of Aloe plants to ascertain their percentage of phenolic compounds and the distribution of these compounds in the plant and in the leaves.

 

Research Projects:

Examining the over 100 Aloe plants in the collection in the Introduction garden of the Unit for Ecophysiology and Introduction of Desert Plants to ascertain the percentage of phenolic compounds and their distribution within the plants and leaves; These phenolic compounds are used by the cosmetic and medicinal industries.

 

Patents:

  • Chauser, E.G., Rudakova, I.P.,Yurkevich, A.M., 1981, Synthesis thrichloro (methilcobalamin) palladium (II), N100737 (3312424). , 1988

 

Abstracts of Current Research:

  • CONTENT AND DISTRIBUTION OF THE SECONDARY COMPOUNDS ANTHRONE C-GLYCOSIDES IN ALOE MUTABLIS PLANTS ORIGINATING FROM THE ARID ZONES OF SOUTH AFRICA AND GROWING IN DIRECT SUNLIGHT AND IN SHADE IN THE NEG: E. Chauser-Volfson and Yitzchak Gutterman*The content of the secondary phenolic compounds anthrone c-glycosides barbaloin and homonataloin in Aloe mutabilis leaves, is higher in young leaves than in older leaves and higher in plants grown in shade than in direct sunlight. The upper third of the leaves contains the highest concentration of these compounds and the base part, the lowest. Young and old leaves of A. mutabilis were cut from plants each month and the exudate was freeze-dried. After separation by TLC the percentages of barbaloin, homonataloin and nataloin were determined spectrophotometrically. The higher distribution of these compounds in the periphery of the leaves and plants may be a defence strategy against leaf eaters.
  • THE DISTRIBUTION OF BARBALOIN IN THE LEAVES OF ALOE ARBORESCENS ACCORDING TO ANATOMY AND ORIENTATION: Aloe arborescens is probably the most widely cultivated species of the genus Aloe in the world. This plant is a conglomerate of medium to large shrubs that are usually multi-stemmed, at or near ground level. The leaves are curved and are soft in texture with rather harmless marginal teeth (van Wyk and Smith, 1996). Aloe arborescens plants have been widely used for medicines and cosmetics and their chemical constituents have been studied (Hay and Haynes, 1956; Kudritskaya et al., 1985; Takayuki and Toshifumi, 1983; Sato et al., 1990). In a previous paper we described the distribution of the secondary phenolic compound barbaloin in A. arborescens leaves. The distribution depends on the leaf part, age and position of the leaf on the plant, as well as on seasonal influences (Chauser-Volfson and Gutterman, 1996). As a continuation of that investigation we have now studied the distribution of barbaloin in the leaves of A. arborescens according to anatomy and orientation. The adaxial leaf margins have the highest barbaloin content.
  • THE DISTRIBUTION OF HOMONATALOIN IN THE LEAVES OF ALOE SPECIES ACCORDING TO THE LEAF AGE AND POSITION: E. Chauser-Volfson and Y. Gutterman The distribution of homonataloin in the leaves of five Aloe species with a high content of homonataloin was investigated. Homonataloin levels from 8 to 12 cut leaves of each plant, from different ages and position on the plant, were analyzed in dry exudates. The highest levels of homonataloin were found in the youngest leaves below the apex of the plants and the lowest levels were in the older leaves. The homonataloin content was determined by the spectrophotometric method at lmax 342-344 nm after thin-layer chromatography separation using Silica gel 60.

 

Publications:

  • Gutterman, Y. and Chauser-Volfson, E. The content of secondary phenol metabolites (SPhMs) in pruned leaves of Aloe arborescens, comparing two methods: leaf exudates and leaf water extract. Journal of Natural Medicine 62: 430-435, 2008
  • Gutterman, Y. and Chauser-Volfson, E. Secondary phenol metabolites (SPhMs), distribution and content of some Aloe species, originated from arid zones of South Africa: A review. American Journal of Food and Technology 2 (7): 555-569, 2007
  • Gutterman, Y. and Chauser-Volfson, E. Changes in secondary phenolic metabolites during storage as an aqueous suspension in comparison with the content in harvested Aloe arborescens leaves. J. of Food Science and Technology 41: 662-666, 2006
  • Chauser-Volfson, E. and Gutterman, Y. Influences of leaf pruning on the content of the secondary phenolic metabolites, barbaloin, aloeresin and aloenin in the leaves of Aloe arborescens. South African Journal of Botany 70 (4): 582-586, 2004
  • Gutterman, Y. and Chauser-Volfson, E. Peripheral defense strategy: variation of barbaloin content in the succulent leaf parts of Aloe arborescens Miller (Liliaceae). Botanical J. of the Linnean Society 132: 385-395, 2004
  • Chauser-Volfson, E., Shen, Z., and Hu, Z. and Gutterman, Y. Anatomical structure and distribution of secondary metabolites as a peripheral defense strategy in Aloe hereroensis leaves. Botanical Journal of the Linnean Society 138: 107-116, 2002
  • Shen, Z., Chauser-Volfson, E., Gutterman, Y. and Hu, Z. Anatomy, Histochemistry and Phytochemistry of Aloe vera L. var. chinesis Leaves. Acta Botanica Sinica 43: 780-787, 2001
  • Shen, Z., Chauser-Volfson, E. and Hu, Z. and Gutterman, Y. Leaf age, position and anatomical influences on the distribution of the secondary metabolites, homonataloin and three isomers of aloeresin in Aloe hereroensis (Aloeaceae) leaves. South African Journal of Botany 67: 312-319, 2001
  • Gutterman, Y. and Chauser-Volfson, E. The distribution of the phenolic metabolites barbaloin, aloeresin and aloenin, as a peripheral defense strategy in the succulent leaf parts of Aloe arborescens. Biochemical Systematics and Ecology 28: 825-838, 2000
  • Chauser-Volfson, E. and Gutterman, Y. Content and distribution of anthrone C-glycosides in the South African and plant species, Aloe mutabilis, growing in direct sunlight and in shade in the Negev Desert of Israel. J. of Arid Environments 40: 441-451, 1998
  • Chauser-Volfson, E. Content and distribution of the secondary phenolic compound homonataloin in Aloe hereroensis leaves according to leaf part, position and monthly changes. J. of Arid Environments 37: 115-122, 1997
  • Chauser-Volfson, E. & Gutterman, Y. The barbaloin content and distribution in Aloe arborescens leaves according to the leaf part, age, position and season. Israel J. of Plant Sciences 44: 289-296, 1996

Keywords: Aloe, Aloenin, Anthrone C-glycosides, Barbaloin, Homonataloin, Phenolic Compounds, Secondary Compounds.