Prof. Sumesh Chander Chhabra
Department of Chemistry
- Acanthaceae, Chhabra, S.C. and Newton, L.E. IN: Dermatologic Botany, Editors: J. Avalos and H.I. Maibach, CRC Press, New York, In prepraration.
- Aloeaceae, Chhabra, S.C. and Newton, L.E. IN: Dermatologic Botany, Editors: J. Avalos and H.I. Maibach, CRC Press, New York, In prepraration.
- 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.
- Nomenclature and Organic Chemistry Practicals for 8.4.4 Second Year Students. Chhabra, S.C. Chemistry Department, Kenyatta University, Nairobi, 1993.
- J.M.Kahindo,C. Sumesh, R. Musau, J.O.Odalo, T. thoruwa (2018). Effect of Rhizoclonium grande saturated fatty Acid Ethyi Esters on Physicochemical and Fuel Properties of Jatropha Curcas Biofuel 2018 Chemical Science Journal 23(1) 1-9
- F. R.E. Essoung, S.C. Chhabra, B. M. Mba’ning, S. A. Mohamed, W. Lwande, B.N. Lenta, S.A. Ngouela, E. Tsamo, A. Hassanali 2018 Larcicidal activities of limonoids from Turraea abyssinica (Meliaceae) on Tuta absolita ( Meyrick)
- Eucleanal A and B: Two new naphthalene derivatives from Euclea divinorum. Margaret Mwihaki Ng’ang’a, Hidayat Hussain, Sumesh Chhabra, Caroline Langat-Thoruwa, Ahmed Al-Harrasi, Karsten Krohn and Ivan Robert Green Chinese Chemical Letters 2012 23, 576–578.
- Eucleanal: A new naphthalene derivative from Euclea divinorum.Margaret Mwihaki Ng’ang’a, Hidayat Hussain, Sumesh Chhabra, Caroline Langat-Thoruwa, Karsten Krohn, Javid Hussain, Ahmed Al-Harrasi, and Ivan Robert Green Natural Product Communications 2012 7, 193-194.
- Drypetdimer A: A New Flavone Dimer from Drypetes gerrardii. Margaret Mwihaki Ng'ang'a, Hidayat Hussain, Sumesh Chhabra, Caroline Langat-Thoruwa, Muhammad Riaz and Karsten Krohn Natural Product Communications 2011 6, 1115–1116.
- Performance of a domestic cooking wick stove using fatty acid methyl esters (FAME) from oil plants in Kenya., A.W. Wagutu, T.F.N. Thoruwa, S.C. Chhabra, C.C.L. Thoruwa and R.L.A. Mahunnah Biomass and Bioenergy 2010, 34, 1250-1256.
- Antiprotozoal activity and cytotoxicity of metabolites from leaves of Teclea trichocarpa. E.S.K. Mwangi, J.M. Keriko, A.K. Machocho, A.W. Wanyonyi, H.M. Malebo, S.C. Chhabra and P.K. Tarus Journal of Medicinal Plants Research 2010 4, 726–731.
- Jatropha curcas L. as a source for the production of biodiesel in Kenya. A.W. Wagutu, S.C. Chhabra, C.L. Thoruwa, T.F. Thoruwa and R.L.A. Mahunnah In: Aspects of African Biodiversity. Eds. J.O. Midiwo and J.M. Clough. Proceedings of the Pan Africa Chemistry Network Biodiversity Conference, Nairobi. 10th to 12th Sept. 2008. Published 2010. The Royal Society of Chemists Publishing, Cambridge, UK. Pgs 152-159.
- Indigenous oil crops as a source for production of biodiesel in Kenya A.W. Wagutu, S.C. Chhabra, C.L. Thoruwa, T.F. Thoruwa and R.L.A. Mahunnah Bulletin of Chemical Society of Ethiopia. 2009, 23, 359-370.
- Margaret Mwihaki Ng'ang'a, Hidayat Hussain, Sumesh Chhabra, Caroline Langat-Thoruwa and Karsten Krohn Chemical Constituents from the Root Bark of Ozoroa insignis. Biochemical Systematics and Ecology 2009 37, 116-119.
- Chege, M.W., Rathore, I.V.S., Chhabra, S.C., and Mustapha, A.O. The influence of meteorological parameters on indoor radon in selected traditional Kenyan dwellings. Journal of Radiological Protection 2009 29, 95-103.
- Margaret Mwihaki Ng'ang'a, Sumesh Chhabra, Caroline Langat-Thoruwa, Hidayat Hussain and Karsten Krohn Chemical constituents from the leaves of Drypetes gerrardii. Biochemical Systematics and Ecology 2008 36, 320-322.
Research Activities 2015
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
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.
- 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,