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Prof. Sylvia Opiyo

Prof. Sylvia Opiyo

Dean, School of Pure and Applied Sciences
sopiyo@mut.ac.ke

Google Scholar: https://scholar.google.com/citations?user=VX02k6sAAAAJ&hl=en

 

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Biography

Education

  • 2012-2014: Postdoctorate in organic chemistry, Maseno University.
  • 2008-2011: PhD (Chemistry) Maseno University, Kenya.
  • 2003-2006: MSc (Chemistry) Maseno University, Kenya.

Publications

  1. Opiyo, S.A. 2023. Warburgia Ugandensis: A Review of Compounds and Bioactivity. International Journal of Pharmacognosy and Chemistry,4(2), 35-45. Retrieved from https://www.saap.org.in/journals/index.php/ijpc/article/view/457
  2. Opiyo, A. 2023. A Review of Chemical Compounds and Bioactivity of Conyza Species. IOSR Journal of Applied Chemistry (IOSR-JAC), 16, (6) 36-48.
  3. Opiyo, A., Njoroge P.W, Kuria K.M., 2023. Chemical Composition and Biological Activity Of Extracts From Conyza Species. IOSR Journal of Applied Chemistry (IOSR-JAC), 16, (4) 61-7.
  4. Opiyo, A., Mugendi, B., Njoroge P.W., Wanjiru S.N. 2023. A Review of Fatty Acid Components in Avocado. IOSR Journal of Applied Chemistry (IOSR-JAC), 16(3),18-27.
  5. Opiyo, A. 2022c. Chemical Composition of Essential Oils from Ocimum Kilimandscharicum: A Review. IOSR Journal of Applied Chemistry (IOSR-JAC), 15 (11), 5-11.
  6. Haron Bosuben, Peter W. Njoroge, Sylvia A. Opiyo, Isaac W. Mwangi 2022. Facile Removal of Phenol from Aqueous Solution Using Modulated Cornstarch Impregnated With Triethanolamine as Adsorbent: Sorption Isotherms and Kinetics. IOSR Journal of Applied Chemistry (IOSR-JAC) e-ISSN: 2278-5736.Volume 15, Issue 8 II (August 2022), PP 34-45.
  7. Opiyo, S.A. 2022b. Stored Grains Protection Activity of Ocimum Suave Extracts and Compounds on Larger Grain Borer. IOSR Journal of Biotechnology and 8(4), 5-10
  8. Opiyo, A. 2022a. Triterpenes and sterols from Ocimum suave. IOSR Journal of Applied Chemistry, 15(7), 1-6.
  9. Opiyo, A., Njoroge P.W., Ndirangu E.G. 2022. A Review Pesticidal Activity of Essential Oils against Sitophilus oryzae, Sitophilus granaries and Sitophilus Zeamais.” IOSR Journal of Applied Chemistry (IOSR-JAC), 15(04), 39-51.
  10. Opiyo, S.A., 2021c. A Review of insecticidal plant extracts and compounds for stored maize protection. IOSR Journal of Applied Chemistry. 14, (10): 23-37.
  11. Opiyo, A., 2021b. Insecticidal Drimane Sesquiterpenes from Warburgia ugandensis against Maize Pests American Journal of Chemistry. 11(4): 59-65
  12. Opiyo, S.A., Muna, K.K., Njoroge P.W., Ndirangu A., 2021. Analgesic Activity of Conyza Floribunda Extracts in Swiss Albino Mice. Journal of Natural Sciences Research, 12(12), 1-6.
  13. Opiyo, S.A., Njoroge P.W., Ndirangu E.A., Kuria K.M., 2021. A Review of Biological Activities and Phytochemistry of Rhus Species. American Journal of Chemistry 2021, 11(2): 28-36.
  14. Opiyo, A., 2021a. Repellent Effects of Ocimum Suave Extracts and Compounds against Prostephanus Truncatus Horn. American Journal of Chemistry, 11(2): 23-27.
  15. Lomertwala H.M, Njoroge P.W., Opiyo A., Ptoton. B.M (2020). Assessing Effect of Acid Treatment on the Chemical Properties of Clays from selected sites in Murang’a and Nyeri Counties, Kenya. Journal of Natural Sciences Research, 11(22), 20-26.
  16. Opiyo, A., 2020c. Insecticidal Activity of Ocimum suave Willd Extracts and Compounds against Sitophilus zeamais Motschulsky. Basic Sciences of Medicine, 9(2):32-37 https://www.doi.org/10.5923/j.medicine.20200902.03
  17. Opiyo, S.A., 2020b. Evaluation of Warburgia ugandensis extracts and compounds for crop protection against Prostephanus truncates. Advances in Analytical Chemistry, 10(2), 15-19.
  18. Opiyo, A., 2020a. Insecticidal activity of Elaeodendron schweinfurthianum extracts and compounds against Sitophilus zeamais Motschulsky. American Journal of Chemistry, 10(3), 39-44.
  19. Kugeria, P.M., Njoroge, P.W., Opiyo, S.O., Mwangi, I.W., 2020. Impure Hydrazone Preparation from Chicken Dung. Chemistry and Materials Research, 12(7), 8-14.
  20. Kuria, K.M., Opiyo A., 2020. Characterization of Immunogenic Soluble Crude Proteins from Biomphalaria Pfeifferi against Schistosoma mansoni. Journal of Natural Sciences Research, 10(12), 28-34.
  21. Ephantus Ndirangu, Sylvia A. Opiyo and Margaret W. Ng’ang’a (2020). Chemical composition and repellency of Nigella sativa L. seed essential oil against Anopheles gambiae sensu stricto. Trends Phytochem. Res. 4(2), 77-84.
  22. Ephantus G. Ndirangu, Sylvia A. Opiyo, Margaret W. Ng’ang’a (2020). Repellent Properties of Compounds and Blends from Nigella sativa Seeds against Anopheles Basic Sciences of Medicine 9(1): 1-7.
  23. Makenzi A.M., Manguro L.O.A, Owuor P.O., Opiyo A., 2019. Flavonol glycosides with insecticidal activity from methanol extract of Annona mucosa Jacq.leave. Trends in Phytochemical Research Trends Phytochem. Res. 3(4) 2019 287-296.
  24. Njoroge P.W., Opiyo A., (2019a). Some Antibacterial and Antifungal Compounds from Root Bark of Rhus natalensis. American Journal of Chemistry 2019, 9(5): 150-158 https://www.doi.org/10.5923/j.chemistry.20190905.03.
  25. Njoroge P.W., Opiyo A., (2019b). Antimicrobial Activity of Root Bark Extracts of Rhus natalensisa and Rhus ruspolii Basic Sciences of Medicine, 8(2): 23-28 https://www.doi.org/10.5923/j.medicine.20190802.01
  26. Lomertwala M, Njoroge P.W., Opiyo S.A., Ptoton. B.M (2019). Characterization of Clays from selected sites for Refractory Application. IJSRP, 9 (11): 600-603. https://www.doi.org/10.29322/IJSRP.9.11.2019.p9581
  27. Makenzi A.M., Manguro L.A.O., Owuor P.O., Opiyo A (2019). Chemical constituents of Ocimum Kilimandscharicum Guerke acclimatized in Kakamega Forest, Kenya. Bull. Chem. Soc. Ethiop. 2019, 33(3), 527-539.
  28. Opiyo A. (2019). A review of 13C NMR spectra of drimane sesquiterpenes, Trends in Phytochemical Research. 3(3) 2019 147-180
  29. Ochung A.A., Owuor O., Manguro L.O.A., Ismael I.O., Nyunja R.A., Ochieng C.O., Opiyo S.A. (2018). Analgesics from Lonchocarpus eriocalyx Harms. Trends in Phytochemical Research, 2 (4), 241-246.
  30. Opiyo S.A, Manguro L.A.O., Owuor P.O. Ateka E.M. (2017).T riterpenes from Elaeodendron schweinfurthianum and Their Antimicrobial Activities against Crop American Journal of Chemistry, 7(3): 97-104. https://www.doi.org/10.5923/j.chemistry.20170703.03
  31. Ochieng C.O., Opiyo S.A., Mureka E.W., Ishola I., (2017). Cyclooxygenase ihibitory compounds from Gymnosporia heterophylla aerial parts. Fitoterapia 119: 168-174.
  32. Opiyo S.A., Manguro L.O.A., Ogur J.A., Wagai S.O. (2010). Bioactive constituents of Conyza floribunda. Journal of Pharmacology, 4(3): 55-
  33. Manguro L.O.A., Opiyo S.A., Asefa A., Dagne E., Muchori W.P. (2010). Chemical constituents of essential oils from three Eucalyptus species acclimatized in Ethiopia and Kenya. Essential Oils, 13(5): 561-567.
  34. Opiyo S.A., Owuor P.O., Manguro L.O.A., Ateka E., Miano D.W. (2010). Development of a PCR technique for simultaneous detection of sweet potato chlorotic stunt virus and sweet potato feathery mottle. Journal of Plant Pathology, 92(2): 353-356.
  35. Opiyo S.A., Owuor P.O., Manguro L.O.A., Ateka E.M., Karuri H.W. (2010). Survey of sweet potato viruses and detection of cucumber mosaic virus in western Journal of Plant Pathology, 92(3) 795-799.
  36. Opiyo S.A., Ogur J.A., Manguro L.A.O., Tietze L.F., Heiko S. (2009). A new sterol diglycoside from Conyza floribunda. South African Journal of Chemistry 62: 163-167.
  37. Opiyo S.A., Manguro L.O.A., Lemmen P., Herdweck E. (2009). Phytochemical analysis of commiphora holtziana oleo-gum. The 13th Natural Product Research Network for Eastern and Central Africa (NAPRECA) Symposium Abstracts Book, page
  38. Manguro L.A.O., Opiyo S.A., Herdtweck E., Lemmen P. (2009). Triterpenes of Commiphora holtziana Oleo-gum resin. Canadian Journal of Chemistry 87(8): 1173-1179.
  39. Opiyo S.A., Ateka E.M., Owuor P.O., Manguro L.O.A. (2009). Development and evaluation of a multiplex PCR technique for simultaneous detection of SPFMV and SPCSV which infect sweet potato. International Livestock Research Institute (ILRI) Graduate Fellow Forum, Entebe, Uganda 19th August,Ochung,’ A.A., Manguro, L.O.A., Owuor, P.O., Jondiko, J.I.O., Nyunja, R.A., Akala, H., Mwinzi, P., Opiyo, S.A., 2015. Bioactive Carbazole Alkaloids from Alysicarpus Ovalifolius (Schumach). Korean. Soc. Appl. Biol. Chem., 58(6), 839–846. https://www.doi.org/10.1007/s13765-015-0100-4 and their anti-inflammatory effects. Plant Medica. 2013; 79: 52–59. https://www.doi.org/10.1055/s-0032-1327880Warburgia ugandensis extracts and isolates against sweet potato pathogens Phytochemistry letters, 4: 161–165.
  40. Opiyo S.A., Ogur J.A., Manguro L.A.O., Wagai S.O. (2007). Antimicrobial terpenoids of Conyza floribunda. The 12th Natural Product Research Network for Eastern and Central Africa (NAPRECA) Symposium Abstracts Book, page 57
  41. Opiyo A., Manguro L.O.A., Okinda-Owuor P., Ochieng C.O. Ateka E.M., Lemmen P. (2011). Antimicrobial compounds from Terminalia brownii against sweet potato pathogens. Natural Products Journal 1: 116-120.
  42. Opiyo A., Manguro L.O.A., Okinda-Owuor P., Ateka E.M., Lemmen P. (2011). 7a-Acetylugandensolide and antimicrobial properties of
  43. Ochieng O., Ishola I., Opiyo S.A., Manguro L.O.A., Owuor P.O., Wong K.C.(2013). Phytoecdysteroids from the stem bark of Vitex doniana
  44. Opiyo S.A., Manguro L.A.O., Akinyi D., Ochung A.A., Ochieng C.O. (2015). Biopesticidal Extractives and Compounds from Warburgia Ugandensis against Maize Weevil (Sitophilus zeamais). Natural Products Journal (ISSN: 22103155), 5(4):236 -243.
  45. Jeruto P., Arama P., Anyango B., Nyunja R., Taracha C., Opiyo S. (2017). Morphometric study of Senna didymobotrya (Fresen.) H. S. Irwin and Barneby in Kenya. Journal of Natural Sciences Reserach 7(6): 54-69. ISSN 2224-3186 (paper), ISSN 2225-0921 (online).
  46. Opiyo S.A., Manguro L.A.O., Akinyi D., Ochung A.A., Ochieng C.O. (2015). Biopesticidal Extractives and Compounds from Warburgia Ugandensis against Maize Weevil (Sitophilus zeamais). Natural Products Journal (ISSN: 22103155), 5(4):236 -243.
  47. Ochung,’ A.A., Manguro, L.O.A., Owuor, P.O., Jondiko, J.I.O., Nyunja, R.A., Akala, H., Mwinzi, P., Opiyo, S.A., 2015. Bioactive Carbazole Alkaloids from Alysicarpus Ovalifolius (Schumach). Korean. Soc. Appl. Biol. Chem., 58(6), 839–846. https://www.doi.org/10.1007/s13765-015-0100-4
  48. Opiyo S.A., Owuor P.O., Manguro L.O.A., Ateka E.M., Karuri H.W. (2010). Survey of sweet potato viruses and detection of cucumber mosaic virus in western Journal of Plant Pathology, 92(3) 795-799.
  49. Opiyo S.A., Ogur J.A., Manguro L.A.O., Tietze L.F., Heiko S. (2009). A new sterol diglycoside from Conyza floribunda. South African Journal of Chemistry 62: 163-167.
  50. Opiyo S.A., Manguro L.O.A., Lemmen P., Herdweck E. (2009). Phytochemical analysis of commiphora holtziana oleo-gum. The 13th Natural Product Research Network for Eastern and Central Africa (NAPRECA) Symposium Abstracts Book, page
  51. Manguro L.A.O., Opiyo S.A., Herdtweck E., Lemmen P. (2009). Triterpenes of Commiphora holtziana Oleo-gum resin. Canadian Journal of Chemistry 87(8): 1173-1179.
  52. Opiyo S.A., Ateka E.M., Owuor P.O., Manguro L.O.A. (2009). Development and evaluation of a multiplex PCR technique for simultaneous detection of SPFMV and SPCSV which infect sweet potato. International Livestock Research Institute (ILRI) Graduate Fellow Forum, Entebe, Uganda 19th August,Ochieng O., Ishola I.,
  53. Opiyo S.A., Manguro L.O.A., Owuor P.O., Wong K.C.(2013). Phytoecdysteroids from the stem bark of Vitex doniana and their anti-inflammatory effects. Plant Medica. 2013; 79: 52–59. https://www.doi.org/10.1055/s-0032-1327880.Warburgia ugandensis extracts and isolates against sweet potato pathogens Phytochemistry letters, 4: 161–165.
  54. Opiyo S.A., Ogur J.A., Manguro L.A.O., Wagai S.O. (2007). Antimicrobial terpenoids of Conyza floribunda. The 12th Natural Product Research Network for Eastern and Central Africa (NAPRECA) Symposium Abstracts Book, page 57.
  55. Opiyo A., Manguro L.O.A., Okinda-Owuor P., Ochieng C.O. Ateka E.M., Lemmen P. (2011). Antimicrobial compounds from Terminalia brownii against sweet potato pathogens. Natural Products Journal 1: 116-120.
  56. Opiyo S.A., Owuor P.O., Manguro L.O.A., Ateka E., Miano D.W. (2010). Development of a PCR technique for simultaneous detection of sweet potato chlorotic stunt virus and sweet potato feathery mottle. Journal of Plant Pathology, 92(2): 353-356.
  57. Manguro L.O.A., Opiyo S.A., Asefa A., Dagne E., Muchori W.P. (2010). Chemical constituents of essential oils from three Eucalyptus species acclimatized in Ethiopia and Kenya. Essential Oils, 13(5): 561-567.
  58. Opiyo S.A., Manguro L.O.A., Ogur J.A., Wagai S.O. (2010). Bioactive constituents of Conyza floribunda. Journal of Pharmacology, 4(3): 55
  59. Opiyo A., Manguro L.O.A., Okinda-Owuor P., Ateka E.M., Lemmen P. (2011). 7a-Acetylugandensolide and antimicrobial properties of properties of Warburgia ugandensis extracts and isolates against sweet potato pathogens