Browsing by Author "Mallavarapu, Gopal Rao"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Composition of the essential oil from the roots of Artemisia annua
    (Springer, 2007) Goel, Divya; Goel, Richa; Singh, Vijender; Ali, Mohammed; Mallavarapu, Gopal Rao; Kumar, Sushil
    Upon hydrodistillation, dried roots of Artemisia annua L. cultivar Jwarharti gave a pleasantly fragrant essential oil with a yield of 0.25%. GC and GC–MS analyses of the oil enabled the identification of 52 components representing 83.2% of the oil. The oil was rich in sesquiterpenes and oxygenated sesquiterpenes and had cis-arteannuic alcohol (25.9%), (E)-β-farnesene (6.7%), β-maaliene (6.3%), β-caryophyllene (5.5%), caryophyllene oxide (4.4%) and 2-phenylbenzaldehyde (3.5%) as its major components. The oil was found to possess considerable fumigant activity and ability to repel adult Tribolium castaneum beetles.
  • Thumbnail Image
    Item
    Volatile compounds of leaves and flowers of periwinkle Catharanthus roseus (L.) G. Don from New Delhi
    (Wiley-Blackwell, 2006) Pandey-Rai, Shashi; Mallavarapu, Gopal Rao; Naqvi, A. A.; Yadav, Anju; Rai, Sanjay Kumar; Srivastava, Suchi; Singh, Digvijay; Mishra, Raghvendra; Kumar, Sushil
    The hydrodistilled waxy oils of the leaves and flowers of Catharanthus roseus (L.) G. Don cv. Nirmal plants grown at New Delhi were analysed by GC and GC–MS. A total of 52 compounds were identified, accounting for the 91.3% of the leaf oil.Among these the main constituents were as follows: (E,E )-2,4-hexadienal (7.7%), citronellol (7.9%), geraniol (7.9%), p-cresol (4.7%), (Z,E )-pentadecanal (6.6%), hexadecanoic acid (4.9%), palmitic acid (4.9%) and phytol (6.4%). A total of 41 compounds were identified, accounting for 99.4% of the flower oil, whose main constituents were heneicosane (20.8%), tricosane (37.9%), tetracosane (6.1%) and docosane (4.3%). A total of 24 compounds occurred in both the leaf and flower oils.