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Ali, Hashim, Joseph Nguta, Fredrick Musila, Isaac Ole-Mapenay, Dorine Matara, and James Mailu. "Evaluation of Antimicrobial Activity, Cytotoxicity, and Phytochemical Composition of Ocimum americanum L. (Lamiaceae)." Evidence-Based Complementary and Alternative Medicine. 2022 (2022): 11.
Kathare, J. M., J. M. Mbaria, J. M. Nguta, G. A. Moriasi, and A. O. Mainga. "Antimicrobial Efficacy, Cytotoxicity, Acute Oral Toxicity, and Phytochemical Investigation of the Aqueous and Methanolic Stem Bark Extracts of Bridellia micrantha (Hochst.) Baill." Pharmacognosy Journal . 13(5) (2021): 1248-1256.
Matara, D. N., J. M. Nguta, F. M. Musila, IO Mapenay, HM Ali, and VM Omambia. "Botanical description, ethnomedicinal uses, phytochemistry and pharmacological effects of Croton dichogamus Pax (Euphorbiaceae). ." The Journal of Phytopharmacology. 10.1 (2021): 42-47.
Ali, HM, J. M. Nguta, IO Mapenay, F. M. Musila, OM Vincent, and DM Nyak. "Ethnopharmacological uses, biological activities, chemistry and toxicological aspects of Ocimum americanum var. americanum (Lamiaceae)." The Journal of Phytopharmacology. 10.1 (2021): 56-60 .
Omambia, VM, J. M. Nguta, ES Mitema, F. M. Musila, DM Nyak, HM Ali, and MA Gervason. "Ethnopharmacology, pharmacological activities, and chemistry of the Hypericum genus." The Journal of Phytopharmacology. 10.2 (2021): 105-113.
Matara, D. N., J. M. Nguta, F. M. Musila, and Mapenay I. "Phytochemical analysis and investigation of the antimicrobial and cytotoxic activities of Croton dichogamus Pax crude root extracts." Evidence-Based Complementary and Alternative Medicine. 2021 (2021): 9.
Mailu, James K., Joseph M. Nguta, James M. Mbaria, and Mitchel O. Okumu. "Qualitative and quantitative phytochemical composition, antimicrobial activity, and brine shrimp cytotoxicity of different solvent extracts of Acanthus polystachyus, Keetia gueinzii, and Rhynchosia elegans." Future Journal of Pharmaceutical Sciences. 7:195 (2021): 1-11.
Mailu, JK, J. M. Nguta, J. M. Mbaria, and M. O. Okumu. "Medicinal plants used in managing diseases of the respiratory system among the Luo community: An appraisal of Kisumu East Sub-county, Kenya." Chinese Medicine. 15.95 (2020): 1-27.
Gakuya, D. W., M. O. Okumu, SG Kiama, J. M. Mbaria, P. K. Gathumbi, P. M. Mathiu, and J. M. Nguta. "Traditional Medicine in Kenya: Past and current status, challenges and the way forward." Scientific African (2020): pp. 1-7. Doi:
Nguta, J. M., R. Appiah-Opong, A. K. Nyarko, Yeboah-Manu, D., G. A. Addo, Otchere, I., and A. Kissi-Twum. "Antimycobacterial and cytotoxic activity of selected medicinal plant extracts." Journal of Ethnopharmacology. 182, (2016): 10-15.
Njenga, D., B. Irungu, J. Mbaria, Mutai C, and J. Nguta. "Antiplasmodial activity, cytotoxicity and acute toxicity of Zanthoxylum Chalybeum Engl. World Journal of Pharmacy and Pharmaceutical Sciences,." World Journal of Pharmacy and Pharmaceutical Sciences,. 5(11), (2016): 208-217.
Musau, J. K., J. M. Mbaria, J. M. Nguta, M. Mbaabu, and SG Kiama. "Evaluation of genotoxicity potential of plants traditionally used for mosquito control in Kenya’s South coast." Merit Research Journal of Medicine and Medical Sciences. 4.4 (2016): 178-182.
Appiah-Opong R., NyarkoA.K., D. Yeboah-Manu, G. A. Addo, I. D. Otchere, and A. Kissi-Twum. "In vitro antimycobacterial activity and toxicity of eight medicinal plants against pathogenic and non-pathogenic mycobacterial strains." . International Journal of Mycobacteriology,. 5.5 (2016) (2016): S106-S107.
Nguta, J. M., R. Appiah-Opong, A. K. Nyarko, D. Yeboah-Manu, Addo, G.A., I. D. Otchere, and Kissi-Twum, A. "In vitro antimycobacterial and cytotoxic data on medicinal plants used to treat tuberculosis." Data in Brief. 7 (2016) .7 (2016) (2016): 1124-1130.
Musau, J. K., J. M. Mbaria, J. M. Nguta, M. Mbaabu, and SG Kiama. "Mosquito repellency and knockdown effect of a plant based formulation." IOSR Journal of Pharmacy. 6.5 (2016): 09-14.
Omwenga, I., L. Kanja, J. M. Nguta, J. M. Mbaria, and P. Irungu. "Organochlorine pesticide residues in farmed fish in Machakos and Kiambu counties, Kenya." Cogent Environmental Science. . 2.1153215. (2016).
Muema, Emily, Peter Kinyanjui, James Mbaria, Joseph Nguta, Sharon Chepkwony, Joseph Kamau, Nyamongo Onkoba, and Atunga Nyachieo. "Toxicity and Safety of Khat (Catha edulis) consumption during pregnancy using Olive Baboons (Papio anubis) as experimental models: A Prospective Randomised Study." Greener Journal of Epidemiology and Public Health. 4.3 (2016): 61-70.
Njenga, D., B. Irungu, J. Mbaria, C. Mutai, and J. M. Nguta. "Antiplasmodial, Cytotoxic and Acute Toxicity Activities of Vernonia lasiopus O. Hoffman." African Journal of Pharmacology and Therapeutics. 4.1 (2015): 16-20.
Mwangi, G. G., J. W. Wagacha, J. M. Nguta, and James M. Mbaria. "Brine shrimp cytotoxicity and antimalarial activity of plants traditionally used in treatment of malaria in Msambweni district." Pharmaceutical Biology. 53.4 (2015): 588-593.
Nguta, J. M., Appiah-Opong, A. K. Nyarko, Yeboah-Manu, D., and G. A. Addo. "Current perspectives in drug discovery against tuberculosis from natural products." International Journal of Mycobacteriology. 4 (2015): 165-183.
Duncan, C. M., L. Catherine, D. Saiffudin, and J. M. Nguta. "In vitro antimicrobial activity of selected medicinal plants in Losho, Narok County, Kenya." International Research Journal of Pharmacy. 6.12 (2015).
Nguta, J. M., Appiah-Opong, A. K. Nyarko, D. Yeboah-Manu, and G. A. Addo. "Medicinal plants used to treat TB in Ghana." International Journal of Mycobacteriology. 4 (2015): 116-123.
Ochora, D. O., S. F. Dossaji, J. M. Nguta, and E. M. Akunda. "Antimalarial activity and acute toxicity of four plants traditionally used in treatment of malaria in Msambweni District of Kenya." European International Journal of Science and Technology. 3.7 (2014).
Murithi, C. K., S. F. Dossaji, J. M. Nguta, and C. W. Lukhoba. "Antimalarial activity and in vivo toxicity of selected medicinal plants naturalised in Kenya." International Journal of Education and Research. 2.5 (2014).
Kaigongi, M. M., S. F. Dossaji, J. M. Nguta, C. W. Lukhoba, and F. M. Musila. "Antimicrobial Activity, Toxicity and Phytochemical Screening of Four Medicinal Plants Traditionally Used in Msambweni District, Kenya." Journal of Biology, Agriculture and Healthcare. 4.28 (2014).
Omwenga, I., L. Kanja, J. M. Nguta, J. M. Mbaria, and P. Irungu. "Assessment of lead and cadmium residues in farmed fish in Machakos and Kiambu counties, Kenya." Toxicological & Environmental Chemistry. 96.1 (2014): 58-67.
Mbaria, J. M., C. Ochodo, and J. M. Nguta. "Forensic case of lead poisoning from a battery manufacturing company in Nakuru, Kenya." Japanese Journal of Veterinary Research . 61 (2013): S64-S66.
Nguta, J. M., J. M. Mbaria, D. W. Gakuya, P. K. Gathumbi, J. D. Kabasa, and SG Kiama. ". Evaluation of Acute Toxicity of Crude Plant Extracts from Kenyan Biodiversity using Brine Shrimp, Artemia salina L. (Artemiidae)." The Open Conference Proceedings Journal. 3 (2012): 30-34.
Nguta, J. M., J. M. Mbaria, D. W. Gakuya, P. K. Gathumbi, J. D. Kabasa, and SG Kiama. "Cytotoxicity of antimalarial plant extracts from Kenyan biodiversity to the brine shrimp, Artemia salina L. (Artemiidae). ." Drugs and Therapy Studies. 2 (2012): e12.
Nguta, Joseph Mwanzia. "Heavy Metal Residues In Camel Milk From Kenya: Health Implications." 2012. Abstract

Arsenic and Lead are naturally occurring elements whose toxicity in humans has been documented throughout history. These metals are widely present in our environment due to their natural occurrence and human activities that have introduced them into the general environment such as the use of borehole water and leaded gasoline. Because arsenic and lead may be present in environments where food crops are grown and animals used for food are raised, various foods such as milk may contain unavoidable but small amounts of arsenic and lead that do not pose a significant risk to human health. However, in certain circumstances they may contain high levels that may lead to contamination of milk with levels that may pose a risk to human health. Camel milk samples (n=15) were collected from Nanyuki, Kenya for arsenic and lead analysis. The heavy metals were determined using atomic absorption spectrophotometry following protein precipitation by use of trichloroacetic acid. All the samples analyzed had arsenic levels that ranged from 0.007 ppm to 0.099 ppm. These levels were found to be lower than the Food and Drug Administration (FDA) recommended maximum level of 0.1 parts per million (0.1 ppm), while 14 out of 15 samples (93%) had lead levels ranging from 0.072 ppm to 0.449 ppm and were observed to be above the codex standard (193- 1995) recommended maximum level of 0.02 ppm. The above results indicate that the sampled camel milk may not be safe for human consumption.

NGUTA, DR. JOSEPH MWANZIA. "Bioavailability of cobalt, Zinc and Selenium and Anthelmintic effects of fortified and non fortified Albendazole in Sheep. J.M.Nguta; J.M.Mbaria." The Kenya Veterinarian, Volume 35, Issue 1, 2011. The Kenya Veterinary Association, 2011. Abstract

Abstract: The present study was carried out to compare the use of liver and plasma analysis as methods of assessing the status of cobalt, zinc and selenium in sheep, and also to assess the anthelmintic efficacy of fortified and non-fortified albendazole preparations. plasma and liver samples were collected in duplicate from fourteen sheep aged nine to twelve months. Plasma samples were collected on days 0, 7, 14, 21 and 28 and liver samples  on days 0, 14 and 28 post treatment, upon sacrifice of the study animals. Various trace elements were isolated from the organic matrix by wet oxidation for mineral analysis using atomic absorption spectrophotometry. data was statistically analysed using repeated measurement test. Significance was noted at p < 0.05. Both the fortified albendazole and non fortified albendazole cleared all the worms in the treated sheep by day 14 post treatment. All the trace elements were shown to be more bioavailable in the liver and plasma of fortified albendazole (Group B) treated sheep compared to the non-fortified albendazole (Group A) treated sheep. The current study has shown that the liver is a better indicator of cobalt, zinc and selenium status in sheep compared to plasma.
Key words: Plasma; Liver; Cobalt; Zinc and Selenium

Gakuya, D. W., J. M. Mbaria, SG Kiama, P. K. Gathumbi, M. Mathiu, and J. M. Nguta. "Ethno veterinary Medicine: The Prospects of Integrating Medicinal Plant Products in Veterinary Medicine in Kenya." Kenya Veterinarian. 35.2 (2011).
NGUTA, DR. JOSEPH MWANZIA. "Ethnodiagnostic Skill of the Digo Community for Malaria: A lead to traditional bioprospecting. J.M.Nguta*, J.M.Mbaria; D.W.Gakuya;P.K.Gathumbi; J.D.Kabasa; S.G.Kiama." Frontiers in Pharmacology. Frontiers, 2011, 2011. Abstract

Malaria is a major public health problem that is presently complicated by the development of resistance by Plasmodium falciparum to the mainstay drugs. Thus, new drugs with unique structures and mechanism of action are required to treat drug-resistant strains of malaria. Historically, compounds containing a novel structure from natural origin represent a major source for the discovery and development of new drugs for several diseases. This paper presents ethnophytotherapeutic remedies, ethnodiagnostic skills, and related traditional knowledge utilized by the Digo community of the Kenyan Coast to diagnose malaria as a lead to traditional bioprospecting. The current study was carried out in three Digo villages of Diani sub-location between May 2009 and December 2009. Data was collected using semi-structured interviews, and open and close-ended questionnaires. A total of 60 respondents (34 men and 26 women) provided the targeted information. The results show that the indigenous knowledge of Digo community on malaria encompasses not only the symptoms of malaria but also the factors that are responsible for causing malaria, attributes favoring the breeding of mosquitoes and practices employed to guard against mosquito bites or to protect households against malaria. This knowledge is closely in harmony with scientific approaches to the treatment and control of the disease. The Digo community uses 60 medicinal plants distributed in 52 genera and 27 families to treat malaria. The most frequently mentioned symptoms were fever, joint pains, and vomiting while the most frequently mentioned practices employed to guard against mosquito bites and/or to protect households against malaria was burning of herbal plants such as Ocimum suave and ingestion of herbal decoctions and concoctions. The Digo community has abundant ethnodiagnostic skills for malaria which forms the basis of their traditional bioprospecting techniques.

Keywords: malaria, antimalarials, ethnopharmacology, ethnodiagnostic skills, Digo community, bioprospecting

Nguta, J. M., J. M. Mbaria, D. W. Gakuya, P. K. Gathumbi, J. D. Kabasa, and SG Kiama. "Ethnodiagnostic skills of the Digo community for malaria: A lead to traditional bioprospecting." Frontiers in Pharmacology. 2.30 (2011).
NGUTA, DR. JOSEPH MWANZIA. "Antimalarial herbal remedies of Msambweni, Kenya J.M. Nguta, J.M. Mbaria, D.W. Gakuya, P.K. Gathumbi, S.G. Kiama." Journal of Ethnopharmacology 128 (2010) 424. 128 (2010): 424-432.Website
Nguta, J. M., J. M. Mbaria, D. W. Gakuya, P. K. Gathumbi, and SG Kiama. "Traditional antimalarial phytotherapy remedies used by the South Coast community, Kenya." Journal of Ethnopharmacology. 131 (2010): 256-267.

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