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(Last updated: June 12, 2014)

Publications

2020

Orata, D.  2020.  Fundamentals of Electrochemistry. , Germany: Lambert Academic Publisher AbstractLap Lambert Academic Publishing

Fundamentals of Electrochemistry is a text which discusses all aspects of the electrochemical processes. This includes, discussions ranging from primary definition of terms in electrochemistry to solution of advanced electrochemical equations which is key in explaining the various electrode processes. The textbook is ideal for senior undergraduate and postgraduate students in Universities.
Orata, D.  2020.  Basic Statistical Thermodynamics. , Germany: Lambert Academic Publishing AbstractLap Lambert Academic Publishing

Basic Statistical Thermodynamics is a textbook suitable for senior undergraduate students and can be used also by posstgraduate students in Universities. This book is a culmination of over three decades of teaching at the University of Nairobi. The approach in the text is geared towards ensuring that, the student can use the book for self study. This has been achieved by showing in detail a step wise manner the derivation of the concepts and principles of statistical thermodynamics.

2015

Orata, D, wabomba J.  2015.  Bentonite used as a host matrix in the study of Ester Hydrolysis. IOSR J.Appl.Chem. 8(2015):60-70.
Orata, D, wabomba J.  2015.  Effect of Acidification on the Adsorption profile of Ester on Zeolite, Diatomite and Activated Carbon. IOSR J.Appl.Chem. 8(2015):26-33.

2014

Mbui, D, ORATA DUKEO, GRAHAM E JACKSON, Kariuki DK.  2014.  Speciation of Some Heavy Metals in Ngong River using the Joint Expert Speciation System (JESS). BEST-IJHAMS. 2(10):59-70. AbstractJournal article

ABSTRACT
Ngong River, a tributary of Nairobi River in the Capital City of Nairobi in Kenya, was assessed for heavy metal
and their species using atomic absorption spectroscopy (AAS) and the Joint Expert Speciation System (JESS) a computer
program for equilibrium calculations. Six sampling points in the middle stream of Ngong River.
Physico-chemical parameters were analyzed insitu while grab samples were analyzed for seven metals and their
species were predicted using JESS. The samples had pH values of about 7.5, except for sample no.3 which recorded a pH
value of 8.3. Of the seven analyzed ions, the most abundant metal was iron with a concentration of 6.56 mg/L while some
of the metals were below the detection limits in some sampling points.
The concentrations of the heavy metals were used to construct speciation predicting model of the Ngong river
using the JESS. Using this model, the major species in most of the samples were predicted to be [Cr(OH)2]
1+, [Fe(OH)2]
1+
,
[Zn4(OH)4]
4+, Mn2+, Cd2+, [Pb4(OH)4]
4+ and [Cu3(OH)4]
2+ for Chromium, iron, zinc, manganese, cadmium, lead and copper
respectively. It is also clear that some ions were found in labile state for example Zn2+, Mn2+, and Cd2+, states that are
considered to be more toxic than their combined states, a situation rendering the Ngong river water unsuitable for domestic
use.
KEYWORDS: Ngong River, Pollution, Heavy Metal, Speciation, JESS
Yusuf, A, Gitu P, Bhatt B, Njogu M, Salim A, Orata D.  2014.  Solid-Phase Peptide Synthesis of Arginine-vasopressin with Amide Side-chain of Asparagine Protected with 1-Tetralinyl Group. Chemistry and Materials Research. 6(4):60.scan0010.pdf
Mbui, D, Orata D, Jackson G, Kariuki D.  2014.  Investigation of Kenyan bentonite In Adsorption of some Heavy metals In aqueous Systems using cycli voltammetric techniques.
Orata, D.  2014.  Basic Thermodynamics And Kinetics (for Scientists and Engineers). , Germany: Lambert Academic Publishers
Orata, D, Amir Y, Nineza C, Mukabi M.  2014.  Electrochemical Characterization of Amoxycillin, a Broad Spectrum Antibiotic on a bentonite Host Matrix, Using Cyclic Voltammetry. IOSR JAC. 7(5):50.scan0002.pdf
Orata, D, Amir Y, Nineza C, Mbui D, Mukabi M.  2014.  Surface Modified electrodes used In cyclic Voltammetric profiling of Quinine An Anti-Malarial Drug. IOSR JAC. 7(5):81.scan0001.pdf
Orata, D, Amir Y, Nineza C.  2014.  Electroanalysis of unconventional (Herbal) Drugs using Surface Modified Electrodes in Conjunction with Cyclic Volatmmetry. IOSR-JAC. 7(5):56.scan0004.pdf
Orata, D, Yusuf A, Nineza C, Mbui D, Mukabi M.  2014.  Surface Modified Electrode Used In the Electro-analysis of N-Acetyl P-Aminophenol- A Pharmaceutical Drug. IOS-JAC. 7(5):90.scan0008.pdf
Orata, D, Njenga H, Mukabi M, Mbui D, Amir Y.  2014.  Polyaniline and Polythiophene Modified Electrodes in Energy Storage Units with hydrocarbon gel/Bentonite/Sodium Chloride as Electrolyte Gel. IOSR-JAC. 7(5):63.scan0006.pdf
Orata, D, Amir Y, Nineza C.  2014.  Derivatized Electrodes in the Electroanlysis of Pyrimethamine/2-Sulfanilido-3-Methoxypyrazine (Metakelfin) and Lumefantrine/Artemeter (Coartem). J.Chem.Chem.Eng. 8:215.scan0011.pdf
Orata, D, Njenga H, Mukabi M, Yusuf A.  2014.  Sodium Thiosulphate, a Novel Electrocatalyst in the Electrosynthesis of Electronically Conducting Polymer-Polythiophene. IOSR-JAC. 7(5):73.scan0005.pdf
Orata, D, Mukabi M, Njenga H, Yusuf A.  2014.  Ellectro-characterization of Polypyrolle electrosynthesized on a Montmorillonite Host-Matrix, In Aqueous Media containing Sulphuric Acid as Supporting Electrolyte. IOSR JAC. 7(5):59.scan0003.pdf
Amir, Y, Gitu P, Bhatt B, Njogu M, Salim A, Orata D.  2014.  1-Tetralinyl as carboxamine-protecting group for asparagine and application to N-a-t-Butyloxycarbonyl (Boc) solid-phase pentide synthesis of oxytocin. Journal of chemistry and materials research. 6(2):1-11. Abstractscan0013.pdf

Oxytocin, a nonapeptide amide, was synthesized on a benzhydryl-resin using the Boc strategy. Benzyl group was
used in the protection of sulfhydryl group of cysteine and tyrosine side-chain. Benzhydryl and tetralinyl groups were
used in the protection of glutamine and asparagine side-chains respectively. TFMSA-TFA-thioanisole-I,2-
ethanedithiol (2:20:2:1 v/v) was used on the peptide-resin under different cleavage conditions to obtain oxytocin in a
one-pot reaction. The cleavage at 40°C for two hours gave oxytocin quantitatively. Oxytocin could be isolated in
56% yield.

2010

Mbui, D, Orata D, Kariuki D.  2010.  Physico-Electrochemical Assesment of Pollutants in Nairobi River(Reclamation of Nairobi River). : Lambert Academic Publishing

2007

Omondi, DO, Othuon LO, Mbagaya GM.  2007.  Physical activity patterns, dietary intake and health status among University of Nairobi lecturers in Kenya. AbstractPhysical activity patterns, dietary intake and health status among University of Nairobi lecturers in Kenya

Health status based on lifestyle-related disease is a concern in many developing countries, including Kenya. Factors related to such disease conditions, are important in ensuring economic sustainability in future. Currently there is limited research in this area. The main objective of this study was to determine the relationship between physical activity patterns, dietary intake and health status of lecturers at the University of Nairobi. The study adopted a cross-sectional survey design. Proportionate and simple random sampling techniques were used to select a sample of 120 lecturers as study participants. Data collection included the use of a questionnaire with a physical activity checklist based on 7-day recall, 24-hour food recall, anthropometric and blood pressure measurements, and also diabetes-related questions. Descriptive statistics mainly means, percentages and correlations were used to analyze data. Inferences were made using chi-square statistics, which revealed a significant relationship between health status and physical activity (χ2 =27.54, N=118 p<0.05) and that lecturers who had at least one of the health problems consumed averagely higher amounts of proteins, fat, carbohydrates and kilocalories compared those without any of the health problems. In conclusion, results indicated that the health status of lecturers tended to be more contingent upon physical activity patterns than dietary intake

2004

Oloo, F, Orata DO, Chacha J.  2004.  Electrochemical study in the use of Surface Modified Electrodes to investigate the interaction of copper pesticides with acidified soil. Website

2002

Orata, DO, Okong’o E, Chacha J.  2002.  Efficiency of polyaniline redox process in hydrochloric and sulphuric acid media.. Website

2001

Ondachi, PW, Orata D.  2001.  Enhanced electro-detection of ascorbic acid in Adansonia digitata fruit by use of surface modified electrodes. enhanced_electrodetection_of_ascorbic_acid_in_adansonia_digitata.pdfWebsite

2000

Segor, F, Orata D.  2000.  Electrodeposition of polyaniline on acidified clay montmorillonite modified electrode. electrodeposition_of_polyaniline_on_acidified_clay_montmorillonite_modified_electrode.pdfWebsite
Orata, D, David SK.  2000.  A comparative study of the electrochemical/electro-degradation of polyaniline from aniline loaded in a clay-mineral/polyaniline composite matrix to that of the bulk solution. Website
Okong’o, E, Orata D.  2000.  Allen–Hickling equation applied to the quasi-reversible polyaniline redox system. Website

1999

Orata, D, Okong’o ER, Doblezz M, Chacha JS.  1999.  Electrochemical Features of Poly-methylaniline electrodeposition from an aqueous acid media. Website
Segor, F, Orata D.  1999.  Bentonite (clay montmorillonite) as a template for electrosynthesis of thyroxine. bentonite_clay_montmorillonite_as_a_template_for_electrosynthesis.pdfWebsite
OMONDI, PROFORATADUKE.  1999.  Polyaniline on acidified clay montmorillonite. Reactive Polymer.. Bull. Chem. Soc. Ethiop., 1993, 7(1), 53-60.. : Earthscan, London. 978-1-84407-469-3 (*) Abstract
A study of malaria on the Kano Plain, Kisumu District, Western Kenya, was carried out between April and August, 1985. The study included a knowledge, attitudes and practices (K.A.P.) survey on malaria illness and the mosquito vector. Overall knowledge about malaria illness was found to be good. However, treatment and prevention practices of malaria were found to be poor. Knowledge of the mosquito and its relationship to malaria was found to be high. Knowledge of methods of prevention of mosquito bites was also found to be high but actual use of the methods was low. Knowledge of traditional methods of prevention of mosquito bites was also found to be high. Actual use was again found to be low.

1998

Orata, DO.  1998.  Determination of pK values as a function of external solution pH using its degradation data. Website

1996

OMONDI, PROFORATADUKE.  1996.  Charge state trapping at a coducting polymer-redox cation exchanger interface-A Bilayer electrode. Reactive Polymers, 28(1996), 287-295.. Draft Report The Apparent Prevalence of Human Brucellosis Among Patients Attending Health Facilities in Nairobi with Special Emphasis in Kibera . : Earthscan, London. 978-1-84407-469-3 (*) Abstract
A study of malaria on the Kano Plain, Kisumu District, Western Kenya, was carried out between April and August, 1985. The study included a knowledge, attitudes and practices (K.A.P.) survey on malaria illness and the mosquito vector. Overall knowledge about malaria illness was found to be good. However, treatment and prevention practices of malaria were found to be poor. Knowledge of the mosquito and its relationship to malaria was found to be high. Knowledge of methods of prevention of mosquito bites was also found to be high but actual use of the methods was low. Knowledge of traditional methods of prevention of mosquito bites was also found to be high. Actual use was again found to be low.

1994

Orata, D.  1994.  Basic Concepts in Phase Equilibria.
OMONDI, PROFORATADUKE.  1994.  Suppression of polyaniline electrochemical degradation in salt solutions.. Bul. Chem. Soc. Ethiop. 1994, 8(1).. : Earthscan, London. 978-1-84407-469-3 (*) Abstract
A study of malaria on the Kano Plain, Kisumu District, Western Kenya, was carried out between April and August, 1985. The study included a knowledge, attitudes and practices (K.A.P.) survey on malaria illness and the mosquito vector. Overall knowledge about malaria illness was found to be good. However, treatment and prevention practices of malaria were found to be poor. Knowledge of the mosquito and its relationship to malaria was found to be high. Knowledge of methods of prevention of mosquito bites was also found to be high but actual use of the methods was low. Knowledge of traditional methods of prevention of mosquito bites was also found to be high. Actual use was again found to be low.
OMONDI, PROFORATADUKE.  1994.  Quantitative aspects of charge transfer in polyaniline during it. Die Makromolekulare Chemie. 1994, 195.. : Earthscan, London. 978-1-84407-469-3 (*) Abstract
A study of malaria on the Kano Plain, Kisumu District, Western Kenya, was carried out between April and August, 1985. The study included a knowledge, attitudes and practices (K.A.P.) survey on malaria illness and the mosquito vector. Overall knowledge about malaria illness was found to be good. However, treatment and prevention practices of malaria were found to be poor. Knowledge of the mosquito and its relationship to malaria was found to be high. Knowledge of methods of prevention of mosquito bites was also found to be high but actual use of the methods was low. Knowledge of traditional methods of prevention of mosquito bites was also found to be high. Actual use was again found to be low.

1993

Orata, DO, Osoro FN.  1993.  Electrochemical degradation of a metallated polyaniline. Website
Orata, DO.  1993.  Benzidine catalysis of aniline electro- polymerization on a carbon graphite electrode. benzidine_catalysis_of_aniline_electro-_polymerization_on_a_carbon_graphite1.pdfWebsite
OMONDI, PROFORATADUKE.  1993.  Oxidation of Ascorbic acid on a polyaniline derivatized electrode.. Bull. Chem. Soc. Ethiop., 1993, 7(1), 53-60.. : Earthscan, London. 978-1-84407-469-3 (*) Abstract
A study of malaria on the Kano Plain, Kisumu District, Western Kenya, was carried out between April and August, 1985. The study included a knowledge, attitudes and practices (K.A.P.) survey on malaria illness and the mosquito vector. Overall knowledge about malaria illness was found to be good. However, treatment and prevention practices of malaria were found to be poor. Knowledge of the mosquito and its relationship to malaria was found to be high. Knowledge of methods of prevention of mosquito bites was also found to be high but actual use of the methods was low. Knowledge of traditional methods of prevention of mosquito bites was also found to be high. Actual use was again found to be low.

1991

  1991.  Electrochemical characteristics of polyaniline electropolymerized on a'phenol'modified carbon electrode. 79162-185498-1-pb1.pdfWebsite

1989

  1989.  Electrochemistry of polyaniline obtained from potentiostatic oxidation of aniline on polythiophene coated electrode. 79241-185810-1-pb.pdfWebsite
Orata, DO.  1989.  Effect of pyridine on the porosity and redox properties of polythiophene. 79296-186002-1-pb.pdfWebsite

1988

Orata, DO, Buttry DA.  1988.  Virtues of composite structures in electrode modification. Preparation and properties of poly (aniline)/nafion composite films.

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