Chemical Structure- Steroid Lactone - 537 Words

Chemical Structure It was in the year 1979 a steroid lactone which was termed as Brassinosteroid was isolated from pollen of Brassica napus (Grove et al, 1979). Later its structure was determined by different spectroscopic analysis mainly by NMR, EI-MS, FAB-MS and also by X-ray diffraction, which was found to be (22R, 23R, 24S)-2ÃŽ ±, 3ÃŽ ±, 22, 23, tetrahydroxy-24-methyl-ÃŽ ²-homo-7-oxa-5ÃŽ ±-cholestan-6-one. Since the discovery of brassinosteroid more than 69 naturally occurring compounds of this hormone family has been discovered. (Yokota 1999a) BR’s are derived from a common 5-choleston skeleton and the structural difference which is present in the different members of this hormone family mainly comes from the side chain present in A/B ring and also from different functional groups present in the ring which is shown in the figure ( Yokota, 1995, 1997). From- The chemical characteristic and distribution of brassinosteroids in plants Natural Occurrence and Distribution in the Plant Kingdom Brassinosteroid molecules although present at low concentration in plants but still they have been reported throughout the plant kingdom and also they are broadly distributed from lower to higher plants. They have also found to be present in different plant organs such as flowers, anthers, seeds, pollens, roots, stems, leaves and grains, although brassinosteroid level varies among them according to organ type and tissue age. Like young and growing shoots contain higher brassinosteroids asShow MoreRelatedSummary of Napoleons Buttons Chapter 12: Molecules of Witchcraft1836 Words   |  8 PagesThree sugar unitsThe steroid ring system In the Digitalis extract, there are also many other molecules thats similar to digoxin, like the digtoxin molecule. It lacks the OH and similar cardiac glycoside molecules are in other plants that are often members of the lily or ranunculus families. The molecules have the same structural features though,so theyre likely resposible for the caridac effect. All have five membered lactone ring thats attached to the end of the steroid system with an extraRead MoreREVIEW - Phytochemical Screening and Extraction4270 Words   |  18 Pagespharmaceutically involves of the separation of medicinally active portions of plant traditional systems medicines, nutraceuticals, of modern folk tissues from the inactive/inert components by using medicines, pharmaceutical intermediates and chemical selective solvents. During extraction, solvents diffuse entities for synthetic drugs [1]. into the solid plant material and solubilize compounds Extraction (as the term is pharmaceutically used) is the with similar polarity [1]. separationRead MoreSocial Behavior Among Monkeys May Be More Nature Than Nurture5979 Words   |  24 PagesAggression Between Cross-Fostered Rhesus Macaque Females and Their Biological Mothers, published in the current issue of Developmental Psychobiology. Rhesus macaques provide an important research population because they organize in strong matrilineal structures, and the female offspring often exhibit the same social behavior as their mothers. The experiment was intended to show if some aspects of that behavior were inherited or learned by the female offspring. I was surprised by what we found, Maestripieri