Prof. Sumesh Chander Chhabra

 

Department of Chemistry
P.O. Box 43844, -00100,
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
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Office 254 20 810901-19
Home 254 20 811335
Mobile: 254 722984567
NAIROBI

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Publications

 

Books

  1. Acanthaceae, Chhabra, S.C. and Newton, L.E. IN: Dermatologic Botany, Editors: J. Avalos and H.I. Maibach, CRC Press, New York, In prepraration.
  2. Aloeaceae, Chhabra, S.C. and Newton, L.E. IN: Dermatologic Botany, Editors: J. Avalos and H.I. Maibach, CRC Press, New York, In prepraration.
  3. Popular Medicinal Plants of Eastern Tanzania. Mshiu, E.N., Chhabra, S.C., Uiso, F.C. and Mahunnah, R.L.A. Nairobi University Press, in press.
  4. Nomenclature and Organic Chemistry Practicals for 8.4.4 Second Year Students. Chhabra, S.C. Chemistry Department, Kenyatta University, Nairobi, 1993.

Research Papers

 Research Activities 2015

- Abstract

Insects are one of the major causes of grain losses during storage. Their impact in the global post-harvest grain crops and other bio-agents range from 10% to 40% for major crops. Management of agricultural pests in the past has been largely depending on the use of effective fumigants and synthetic chemical pesticides like phosphine and methyl bromide for field and post-harvest protection of crops. However, these synthetic insecticides are toxic and show adversely effects to the environment by contaminating soil, water and air such as ozone depletion. The extensive use of these insecticides has led to develop a resistance in several species, vast destruction of beneficial organisms.
The twospotted spider mite, Tetranychus urticae Koch. (Acari: Tetranychidae), is one of the most serious pests in the world of exported food, such as paprika, apple, pear, rose, strawberry, bear and sweet persimmon and of horticultural plants. For example, on mandarin trees, T. urticae produces webbing and dense colonies on the underside of the leaves. As a result of their feeding, chlorotic spots are observed on the upperside of the leaves. At the end of summer, T. urticae causes a characteristic fruit scarring and consequent fruit.
Control of these insects pest relies heavily on the use of synthetic insecticides which has serious drawbacks such as development of genetic resistance, toxic residues, worker safety and increasing cost of application. Because of the increasing drawbacks of the continuing use of today’s conventional fumigants, an effort is needed to develop new plant substances as alternative pest control agents to replace the fumigants which are currently used.
In this regard species of genus Kotschya and Trichilia belonging families, Papilionaceae and Meliaceae are being investigated for secondary metabolites having repellants, toxic and growth disrupting effect on the two spotted spider mite.

SYNTHESIS OF (R)-1-METHYL-4-(1-METHYLETHENYL)CYCLOHEXENE MULTIFUNCTIONAL DERIVATIVES AND THEIR EFFECTS ON JATROPHA CURCAS AND ALGAE BIOFUEL BLENDS PROPERTIES

- Abstract

Around the world there is a growing increase in biofuel consumption mainly ethanol and biodiesel as well as their blends with petroleum diesel to reduce cost while retaining the advantages of biofuels such as increasing lubricity and reduction of exhaust emissions. Currently there is a desire to extend or enhance biodiesel and biodiesel blended properties by use of multifunctional additives. This project is seeking to evaluate the miscibility of the fatty acid ethyl ester (FAEE) blends from algae and Jatropha curcas L. oils also synthesise saturated, hydrogenated and oxygenated derivatives of d-limonene as additives to the biofuel blends to enhance their ignition-related, miscibility and thermochemical properties.
Properties of improved fuel with different added derivatives of d-Limonene and ethanol production from algae are being investigated.

Conferences

  • Antiplasmodial activity of some plants used in Kisii and Kwale communities, Kenya against Malaria and their chloroquine potentiation effects.Proceedings of the 100th Indian Science, Medical Sciences, The Indian Science Congress Association, Kolkata, India, 3rd - 7th January, 2013
  • Inter-Institutional Workshop, PHEA Educational Technology Initiative, Wanderers Club, Johannesburg, South Africa, 12th – 15th March, 2012.
  • Inter-Institutional Workshop, PHEA Educational Technology Initiative, Wanderers Club, Johannesburg, South Africa, 22nd – 25th March, 2011.Kenya Chemical Society Nairobi Chapter Workshop, Chiromo Campus, University of Nairobi, Kenya, 28th September 2010.
  • PHEA Project 4 Workshop, Open Distance & e-Learning (ODeL), Kenyatta University, 13th - 14th September 2010; co-organized with Dean SPAS, Kenyatta University, Kenya.
  • 1st East African Regional Scientific Conference of Pure and Applied Sciences, Kenyatta University, Nairobi, Kenya 10th - 14th August 2010. The role of biological, physical and applied sciences in the achievement of the millennium development goals.
  • Better Learning, Better Skills: Developing High Quality Academic Practice in learning and teaching in Kenya and East Africa. Conference hosted by Strathmore University York St. John University, Faculty of Education and Theology 13th and 14th July 2010.
  • Ethnobotanical and Antimalarial Studies on Plants Used for Malaria Management in Coast, Eastern and Nyanza Provinces of Kenya. 4th World Congress on Medicinal and Aromatic Plants (WOCMAP IV) – Using Plants to Benefit People. Cape Town International Convention Centre (CTICC) Cape Town, South Africa, 9th - 14 November 2008. http://www.africanethnomedicines.net/ojs2/index.php/ajtcam
  • African Journal of Traditional, Complementary and Alternative medicines (AJTCAM), ABSTRACTS OF THE WORLD CONGRESS ON MEDICINAL AND AROMATIC PLANTS, CAPE TOWN NOVEMBER 2008 (Pages 433-444) http://www.africanethnomedicines.net/ojs2/index.php/ajtcam/article/view/848
  • Indigenous oil crops: as a source for production of biodiesel in Kenya. The 1st Pan Africa Chemistry Network Conference on Biodiversity, College of Biological and Physical Sciences, University of Nairobi, Nairobi, 10th – 12th September 2008.
  • The 20th International Conference on Chemical Education. Satellite Meeting on “The Relevance of Chemistry in a Globalized Society.” Organized by IUPAC, RSC, Kenya Chemical Society and University of Nairobi, University of Nairobi, Chiromo Campus, Nairobi, Kenya,11-12th August 2008,

 

 

Last Updated on Monday, 07 March 2016 06:29

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