• Anastasiah Ngigi, Zachary Getenga, Hamadi Boga, Paul Ndalut (2014). Biodegradation of hexazinone by Enterobacter cloacae sp.from long-term treated sugarcase-cultivated soils in Kenya soils. Bull. Environ. Contam. Toxicol.92 (3):364-368.

• Du, N., Kariuki, V., Okello, V., Bushlyar, V., and *Sadik, O. A.; Current and Emerging Technologies for Characterization of Nanomaterials, ACS Sustainable Chemistry & Engineering, Just Accepted 2014.

• Gershom Kyalo Mutua, Anastasiah Ngigi and Zachary Getenga (2014). Study of Chlorpyrifos in soils with different treatment regimes within the Nzoia River Drainage Basin, Kenya (in Preparation).

• Kamau R. W., Baraza D. L., Heydenreich M and Juma B. F. (2014) Antimicrobial phytochemicals from root, stem bark and seed of Melia volkensii (In Preparation)

• Naumih M Noah, Veronica Okello, Zhaoyong Sun and Omowunmi A. Sadik*, Nanoremediation of Cr (VI). An Instrumental Method Analysis Laboratory Experiment, Journal of Chemical Education, 2014, 91, (2), 269-273.

• Nyandiko N. Omwoyo, Jacob Wakhungu and Zachary Getenga (2014). Effect of climate variability on maize yields in the Arid and semi-arid lands of lower eastern Kenya. Submitted to Climate and development (Ref. ID 14- CDEV 439-RA).

• Regina N. Bwire, Ishmael B. Masesane and Majinda R. T. Runner (2014). Radical Scavenging Principles from Cassia abbreviata beareana Holmes and Vangueria parvifolia Sond. Submitted to The Journal of Ethnopharmacology.

• Selly Jemutai-Kimosop, Francis Orata, Isaac Odhiambo K’owino and Zachary Getenga (2014). The dissipation behavior of carbofuran in two soils differeing in prior exposure to carbofuran within Nzoia River Drainage Basin, Kenya. Bull. Environ. Contam. Toxicol. 92(5):616-620.

• Veronica A. Okello, Michael T. Knipfing, Victor Bushlyar and Omowunmi A. Sadik*, Green Remediation of Pb(II) ions using Quercetin Pentaphosphate, 2014. (In Preparation).

• Veronica A. Okello, Samuel Gass, Georgios Pyrgiotakis, Nian Du, Kimberly. Murdaugh, Boling Deng, Philip Demokritou* & Omowunmi A. Sadik*, Electrochemical Detection of Industrially-relevant Engineered Nanoparticles, 2014 (In Preparation).


• Anastasiah Ngige, Zachary M. Getenga, Ulrike Doerfler, Hamadi I. Boga, Benson Kuria, Paul Ndalut, Reiner Schroll (2013). Effects of carbon amendment on in situ atrazine degradation and total microbial biomass. J Environ Sci Health Part B. 48, 40–48 DOI: 10.1080/03601234.2012.716727

• Caroline Onyancha and Zachary Getenga (2013). Geochemistry of groundwater in the Volcanic Rocks of Nairobi. Global journal of Science Frontier Research Environment and Earth Science Online ISSN 2249-4626&print ISSN 0975-5896.

• Omotayo Sindiku, Francis Orata, Roland Weber, Oladele Osibanjo. Per- and Polyfluoroalkyl Substances in selected Sewage Sludge in Nigeria. Chemosphere 92 (2013), pp. 329-335

• Richard Mogwasi, Benuel Mogaka, Enock Okiambe, Hudson Nyambaka, Jane Murungi, Zachary Getenga, Enock Amboga, Evans Onyancha, Samuel Abuga and Evans Kenanda (2013) Effect of occupation on the levels of lead in human blood in Kenya. Chemistry and Materials Research 3(4) ISSN 2224-3224.

• Richard Mogwasi, Zachary Getenga, Nyambaka Hudson, Ruth Wanjau, Jane Murungi, Enock Okiambei, Evans Onyancha (2013). Comparison of lead levels with Calcium, Zinc, and phosphorus levels in human blood. Global Journal of Pure and Applied Chemistry Research. 1(1), 44-59.

• Robin Vestergren, Francis Orata, Urs Berger, Ian T. Cousins. Bioaccumulation of perfluoroalkyl acids in dairy cows in a naturally contaminated environment. Environmental Science and Pollution Research. 10.1007/s11356-013-1722-x.Pg. 1-11

• Were L. L. Munyendo, Zhenhai Zhang, Sarra Abbad, Ayman Y. Waddad, Huxia Lv, Lilechi D. Baraza, and Jianping Zhou. Micelles of TPGS Modified Apigenin Phospholipid Complex for Oral Administration: Preparation, In Vitro and In Vivo Evaluation. J. B Journal Biomedical Nanotechnol. 9, 2034-2047 (2013).


• Anastasiah Ngigi, Zachary Getenga, Hamadi Boga, Paul Ndalut (2012). Biodegradation of s-triazine herbicide atrazine by Enterobacter cloacae and Burkholderia cepacia sp. from long-term treated sugarcane-cultivated soils in Kenya. J Environ Sci Health Part B. 47(8):769-778.

• Boniface M. Muendo, Joseph O. Lalah, Zachary M. Getenga (2012). Behaviour of pesticide residues in agricultural soil and adjacent River Kuywa sediment and water samples from Nzoia sugarcane belt in Kenya. The Environmentalist DO110.1007/s10669-012-9407-4

• Ogutu I. Onyango, Baraza L.D, Bii and Mutai. Phytochemical analysis and antimicrobial activity of Phytolacca dodecandra, Cucumis aculeatus and Erythrina excels. Int. J. Biol. Chem. Sci. 6(2): 692-704, April 2012.

• Richard Mogwasi, Hudson Nyambaka, Jane Murungi, Zachary Getenga, Lydia Kimoro, Enock Okumbe, Benuel Nyagaka (2012) Effect of environmental exposure on the lead levels in human blood in Kenya. J. Environ Earth Sci.online 2(10).

• Selly Jemutai-Kimosop, Francis Orata, Zachary Getenga. The Influence of Filter Mud Compost and Tithonia diversifolia Leaves on the Dissipation of Diuron in Soils within the Nzoia River Drainage Basin, Kenya. Bull Environ Contam Toxicol. Volume 89, Issue 2 (2012), Page 328-333

• Were LL Munyendo, Huixia Lv , Habiba Benza-Ingoula, Lilechi D. Baraza, and Jianping Zhou . Penetrating Peptides in the Delivery of Biopharmaceuticals. Biomolecules 2012, 2(2), 187-202; Review paper. 

• Okello, V. A.; Chong, J.; Zhou, A.; Doetschman, D. and *Sadik, O. A.; Cr(VI) Removal using Quercetin and Other Naturally-occurring Flavonoids, Environmental Science and Technology, 2012, 46, 10743−10751


• Charles K. Twesigye, Simon M. Onywere, Zachary M. Getenga, Shadrack S. Mwakalila, S. Josephine, K. Nakiranda (2011). The impact of land use activities on vegetation cover and water quality in the lake Victoria watershed (2011). The Open Environ. Eng. Jour. 4:66-77.

• Ngigi, A., Doerfler, U., Scherb, H., Getenga, Z., Boga, H., Schroll, R. (2011). Effect of fluctuating soil humidity on in situ bioavailability and degradation of atrazine. Chemosphere 84 (4): 369-375.

• Ngigi, A., Getenga, Z., Boga, H., Ndalut, P. (2011). Biodegradation of phenylurea herbicide Diuron by microorganisms from long-term treated sugarcane-cultivated soils in Kenya.Toxicol. Environ. Chem. 93(8): 1623-1635. DOI: 1080/02772248.2011.595718.

• Orata, Francis , Maes, Anke , Werres, Friedrich and Wilken, Rolf Dieter(2011) 'Perfluorinated Compounds Distribution and Source Identification in Sediments of Lake Victoria Gulf Basin', Soil and Sediment Contamination: An International Journal, 20: 2, 129 -141

• S.C. Lagat, J.O. Lalah, C.O.Kowenje, Z. M. Getenga (2011). Metribuzin mobility in soil column as affected by environmental and physicochemical parameters in Mumias sugarcane zone, Kenya. APRN jour. Agr. Biol. Sci. 6:27-33.

• Silas C. Lagat, Joseph O. Lalah, chrispine O. Kowenje, Zachary M. Getenga, Richard Chepkui (20011). Metribuzin sorption dynamics in acid soils of Nzoia sugarcane zone in Western Kenya. Int.J. disaster manag. risk reduction 3(2):64-72.

• Simon Onywere, Zachary Getenga, Shadrack Mwakalila, Charles Twesigye, Josephine Nakiranda (2011) The Challenge of Settlement in the Budalangi Area of Nzoia River Drainage Basin: Policy Change Perspective and Using Remote Sensing Data. Open Environ. Eng. Jour. 4: 97- 104.

• Okello, V. A.; Du, N.; Deng, B. and *Sadik, O. A.; Environmental Applications of Poly(amic)- based Nanomaterials, Journal of Environmental Monitoring, 2011, 13, 1236 – 1245.

• Kikandi, S. N.; Okello, V. A.; Wang, Q. and *Sadik, O. A.; Size- Exclusive Nanosensor for Quantitative Analysis of Fullerene C60, Environmental Science and Technology, 2011, 45, 5294 – 5294.

• Omole, M. A.; Okello, V. A.; Lee, V.; Zhou, L. and *Sadik, O. A.; Catalytic Reduction of Hexavalent Chromium using Flexible Nanostructured Poly(amic) Acid, ACS Catalysis, 2011, 1, 139 – 146.


• Natalia Quinete, Francis Orata, Anke Maes, Markus Gehron, Karl-Heinz Bauer, Isabel Moreira, Rolf-Dieter Wilken . Degradation Studies of New Substitutes for Perfluorinated Surfactants. Arch Environ Contam Toxicol. 2010 Jul; 59(1):20-30.


• Akumu Edwin, Ndalut Kiptogon, Paul Chepkwony and Ooko Selline Awino (2009) “The in vitro Anti-plasmodial activity of 22B-(S)-2-methyl-2-butenoxloxy}-3-oxyolean12en-28-oic acid on Choloroquine Resistant Indochinal W-2 Parasite clones” Journal of Agriculture and Applied Science and Technology (JOPAST)1,33-39, 2009.

• Francis Orata, Natalia Quinete, Rolf-Dieter Wilken. “Long Chain Perfluorinated alkyl acids Derivatisation and Identification in Biota and Abiota Matrices using Gas Chromatography”. Bull Environ Contam Toxicol. Volume 83, Number 5 (2009), 630-635

• Getenga, Z. M., Doerfler, U. and Schroll, R. (2009). Study of atrazine degradation in soil from Kenyan sugarcane-cultivated fields in controlled laboratory conditions. Toxicol Environ chem. 91(2): 195-207.

• Getenga, Z. M., U. Doerfler and R. Schroll (2009). Laboratory degradation studies of 14C-atrazine –isoproturon in soil from sugarcane cultivated fields under Kenyan tropical conditions. Bull Environ Contam Toxicol. 82:678-682.

• Getenga, Z., Ulrike Doerfler, Azuka Iwobi, Michael Schmid and Reiner Schroll (2009). Isolation and Characterization of Atrazine- and Terbuthylazine-Mineralizing Arthrobacter GZK-1 species from Soil in Sugarcane-Cultivated Fields in Kenya. Chemosphere 77(3), 534-539

• Lalah J.O., Muendo B.M., Getenga, Z.M. (2009). The dissipation of hexazinone in tropical soils under semi-controlled field conditions in Kenya. J Environ Sci Health 44(7), 690-696.

• Ndege, T.M., Getenga, Z.M., Nyongesa, H., Chacha, S. (2010). Social value formation and switching to Tithonia in Nzoia River drainage basin (NRDB), Kenya. Global Business and Economic anthology 11(2):128-136.

• Regina N. Bwire, Runner R. Majinda, Masesane B. Ishmael and P.G. Steel (2009). From Nature, through chemical synthesis, towards use in Agriculture: Oryzoxymycin case study. Journal of Pure and applied Chemistry, 81(1), 105.

• Onywere, S.M., Getenga, Z.M., Mwakalila, S.S., Twesigye, C.K. and Nakiranda, J.K. (2009). Potential of satellite imagery, policy and institutional frameworks in addressing sustainable utilization and management of watershed resources in Lake Victoria basin in “ Lake Victoria Research Initiative proceedings” Eds (Banadda N., Isabirye, P., Onywere, S., Nampala, P. and Tenywa, J.S.) . ISSN2078-5933.

• Ooko Selline Awino, Paul Chepkwony Kiprono, Kipkemboi Pius Karonei, Festus Kaberia and Pius Obala, (2009). “Larvicidal activity of 2,5-dihydroxy-3-methyl-1,4-benzoquinone from Embelia Schimperi”. Journal of Agriculture and Applied Science and Technology (JOPAST)1,12-13, 2009.

Chair of Department














Dr. Francis Orata Omoto (Profile)

Pure and Applied Chemistry

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