National Research Repository
The National Research Fund facilitates research for the advancement of Science, Technology and Innovation. One of our core functions is to compile and maintain a national database of research and innovation projects funded by the Fund and other agencies as per the STI Act of 2013.
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Registry of Repositories in Kenya (RoRiK)
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Recent Submissions
Bioprospecting for Phytochemical Repellents and bio-pesticides of the Jigger Flea Tunga penetrans from the Western Kenya Flora.
(WIPO International Publication, 2022-03-03) Maurice V. Omolo, Paul K. Tarus, Joseph Owino, Regina Bwire, Vitman M. Wafula, Judith V. Adhiambo, Regina J. Cheptum, Vincent C. Terer, Anderson Misati, James Nonoh, John Muoma, Dennis Ochieno and Consolata Ngala
Discloses a composition comprising for treating jigger infestation, comprising Nicotine and related compounds present in Nicotiana tobaccum as bio-pesticides and antitungiasis of the jigger flea, Tunga penetrans. A single application of 10% formulation of Nicotine, nornicotine, Anabasine, Anatabine, Continine and myosmine in the ratio of 85: 2: 4: 7: 1: 1 respectively in petroleum jelly base of 90% and lemon Eucalyptus oil of 1 g on a jigger (6) infested victim's feet (6) gives 100% pesticide activity within 5-7 days as demonstrated by recovered foot (2B) and jigger scars (8). The said bio-chemicals, alone or in combination with one another and/ or other natural or synthetic pesticides exhibit activity against the jigger flea among other blood feeding insect & arachnid pests of humans and animals. Also discloses a method of formulating the bio-pesticide composition consisting of Nicotine and other biomolecules extracts from Nicotiana tobaccum.
An Overview of Heavy Metal Pollution in the Western Indian Ocean (WIO) region of Kenya: A Review
(Blueprint Academic, 2024-06-20) Nyamora Moraa Jane, Njiru James, Nyakeya Kobingi, Getabu Albert and Muthumbi Agnes
This study is a review on heavy metal pollution in the Western Indian Ocean (WIO) region of Kenya. The review
examines heavy metal pollution of copper, lead, cadmium, iron and zinc that are toxic to marine life and human
health; and identifies gaps for future monitoring and assessment. Each pollutant was addressed in order to
determine their status in the environment, sources and their effect on biological systems, marine organisms, and
human health. Although the concentration levels of these metals are still low and within the recommended
standards of global regulating bodies, there is little information in relation to their effects along the food web,
human health and how they affect the population dynamics of fish species. Apart from regular monitoring and
assessment further research on their effects in the food web and an assessment of human health is
recommended.
Trends in Water Quality in a Tropical Kenyan River-estuary System: Responses to Anthropogenic Activities
(Asian Journal of Biology, 2024-05-11) Kobingi Nyakeya, James Onchieku, Frank Masese, Zipporah Gichana, Albert Getabu and Jane Nyamora,
Aims: To determine the spatial variation in physico-chemical water quality attributes in estuarine
ecosystems of South Coast Kenya to inform its management.
Study Design: We employed diagnostic research design where such factors as anthropogenic
activities, hydrology, and accessibility were considered in choosing 12 sampling stations. A mixed
sampling design (probability and non-probability) was used to sample.
Place and Duration of Study: Four discharging rivers into estuarine system with a reference point
were identified. 12 sampling points were earmarked and sampled for 12 months.
Methodology: Nine selected water quality parameters were collected in triplicates monthly for 12
months. Temperature, dissolved oxygen, pH, conductivity, salinity and TDS were collected in situ
using YSI Multiparameter meter (Professional plus) while nutrients were analyzed in the laboratory
calorimetrically. Data was tested for normality and homogeneity of variances using Levene's and
Shapiro-Wilk tests. Two-way analysis of variance (ANOVA), and Principal Component Analysis
(PCA) were done using the 64-bit R Software version 4.3.0 to test for significant differences and
correlate the parameters among the sampling sites respectively. Observed differences were
considered statistically significant at P < 0.05.
Results: The measured environmental variables differed significantly among the sampling stations
(P < 0.05). temperature and salinity exhibited moderate to strong effect on water quality, while pH
and nutrients (phosphates, nitrates, and ammonia) exhibited mixed effects with both negative and
positive loadings on the Principal Components. It is demonstrated that the south coast estuary,
Kenya is affected by two gradients: mineralization from the sea and the organic matter gradient at
the upstream stations dominated by the fluvial inflows from the respective rivers.
Conclusion: The south coast of Kenya estuary is impacted by natural processes and
anthropogenic activities. we recommend for continued regular water quality assessment and
monitoring to acquire sufficient data to shape policy frameworks towards its sustainable
management.
Potential Application of CamelMilk as a Therapeutic Ingredient in Bath Soaps and Shampoos
(2024) Oginga Elly, Toeri Julius, Marete Eunice, Arimi Joshua
The increasing worldwide market for natural-ingredient-based cosmetic toiletries is fueled by the awareness of the dangers of
synthetic cosmetics and benefits of natural-based cosmetics on the skincare and management of skin disorders. Besides naturally
formulated cosmetics being biodegradable, they also contain ingredients which are chemically beneficial to human skin. Milk based cosmetics are very promising since milk is rich in essential components such as lactoferrins, vitamins, and lactic acids, which
have shown therapeutic properties against disorders such as skin cancer, acne scars, and dandruff. One of the milk that is very
promising in the cosmetics industry is the camel milk. Currently, there is limited information in literature regarding the use of
camel milk in cosmetics and their benefits. Camel milk stands out from bovine milk following its unique therapeutic properties
and chemical composition, making it a potential ingredient for skincare and haircare products such as bath soaps and shampoos.
The aim of this paper is to review the available literature on camel milk composition and evaluate the contribution of camel milk
constituents to cosmetics
Effects of optimizing fermentation time and stabilizers using response surface methodology on physicochemical properties of camel milk yoghurt
(Elsevier B.V., 2024-08-07) Philip K. Marete, Alfred M. Mariga, Guyo Huka, Levi Musalia, Eunice Marete, Julius M. Mathara, Joshua M. Arimi
The objective of this study was to produce camel milk yoghurt with desired qualities using optimized processing conditions (fermentation time) and ingredients (stabilizer and calcium chloride). The conditions were obtained through Response Surface Methodology (RSM) by lactic acid fermentation by inoculating the milk with Lactobacillus delbrueckii subsp. Bulgaricus (YF-L903, CHR Hansen, Denmark. The study also determined the effects of fermentation time and ingredients on the quality of yoghurt. Fermentation time ranged from 2 to 22 h while stabilizer (corn starch) and calcium chloride (salt) ranges were 1.65–3.34 and 0.061–1.23 % respectively. The quality was monitored hourly for a fermentation period of 2–22 h by determining pH, total titritable acidity (TTA) and viscosity. Results indicated that viscosity was influenced by fermentation time, stabilizer and calcium chloride. The viscosity was increased from 0.01 to 0.4 and 0.01 to 0.3 by fermentation time, 0.01 to 0.2 and 0.01 to 0.3 by stabilizer and 0.01 to 0.5 and 0.01 to 0.6 Pa s by calcium chloride. Whereas the combined effects of calcium chloride and stabilizer increased the viscosity of yoghurt to 0.94 Pa s. Prolonged fermentation time, led to an increase in TTA and a decrease in pH. The finding from this study indicated that the optimal conditions required to produce camel milk yoghurt with desired qualities are a fermentation time of 10 h using 2.33 and 0.60 % corn starch and calcium chloride respectively. Under these conditions the produced camel milk yoghurt quality properties were a pH of 4.07, 0.32 % TTA and a viscosity of 0.35 Pa s.
