Name: Professor GAS Premakumara
Position: Professor
Email: premakumara@kdu.ac.lk
Tel No: (+94) 777316563
Google Scholar

  1. BSc (UOC)
  2. PhD (Chemical Biology)
  3. Post Doc (Nutrition Biochemistry) (Japan)
  4. CTHE (USJP)
  5. Dip (Psy Coun)
  6. CBiol (SL)
  7. CChem (SL)
  8. FIBiol (SL)
  9. FIChemC (SL)
  10. FNAS (SL)
  1. Exploration of Marine & Terrestrial Ecosystems for Bioactive molecules in Biomedical and Agricultural applications
  2. Exploration of traditional food and medicinal herbs for prevention and management of chronic diseases
  3. Exploration of Sri Lankan biota for Natural Antibiotics, Nutraceuticals and Cosmaceuticals development
  4. Exploration of nature for biosystem technologies
  1. Ratnasooriya, W.D., Munasinghe, V.R.N. and Premakumara G.A.S.(1988). Inhibitory effect of D-glucose diethyldithioacetal on washed human spermatozoa. Med. Sci. Res., 16, 1029-1030.
  2. Ratnasooriya, W.D., Premakumara G.A.S. and Tillekeratne, L.M.V.(1990). Gastroprotective activity of crude extract of Jania sp.(red algae) on ethanol-induced gastric lesions in rats. Med. Sci. Res., 18 , 803-804.
  3. Ratnasooriya, W.D., Jayawardana, K.G.G. and Premakumara, G.A.S.(1990). Antimotility effect of  Piper betle (L) leaf extract on washed human spermatozoa. J. Nat. Sci. Coun. Sri Lanka, 18(1), 55-62
  4. Ratnasooriya, W.D., Amarasekare, A.S., Perera, N.S.D. and Premakumara, G.A.S.(1991). Sperm antimotility properties of seed exract of Abrus precatorius. J. Ethnopharmacol., 33, 85-90.
  5. Ratnasooriya, W.D., Amarasekare, A.S., Aberatne, V.D.K. and Premakumara G.A.S. (1991). Impairment of sperm motility with root extract of Ipomea marutiana. Med. Sci. Res., 19, 29-31.
  6. Ratnasooriya, W.D., Premakumara, G.A.S. and Tillekeratne, L.M.V.(1991). Antihypertensive properties of crude extract of Gracilaria  sp. Vidyodaya J. of Science, 3, 35-40.
  7. Ratnasooriya, W.D, Premakumara, G.A.S. and Tillekeratne, L.M.V. (1992). Exploratory behavior of male rats treated with a crude extract of Ficus tsijela leaves. Med. Sci. Res., 20, 233-234.
  8. Ratnasooriya, W.D. and Premakumara, G.A.S. (1992). Effects of the prostanoid receptor antagonist, Di-4-phloretin phosphate, upon human sperm motility. Contraception, 45, 239-248.
  9. Premakumara, G.A.S., Ratnasooriya, W.D., Balasubramanium, S., Dhanabalasingham, B., Fernando, H.C., Dias, M.N., Karunaratne, V. and Gunatilaka, A.A.L. (1992). Studies on terpenoids, part 24.  The effect of some natural quinonemethide and 14(15)-ene-quinone-methide nortriterpenoides on motility of human spermatozoa in vitro. Phytochem.(Life Sci. Adv.), 11, 219-223.
  10. Ratnasooriya, W.D., Liyanage, G.K., Caldera, H.S., Premakumara, G.A.S., Manatunge, A.M.V.R. and Fernando, S.B.U.(1992). Thrombocytosis: a possible signal of conception in elephants ?.Med. Sci. Res., 20, 801-802.
  11. Ratnasooriya, W.D. and Premakumara, G.A.S.(1993). Oxytocin suppresses motility of human spermatozoa in vitro. Med. Sci. Res. 21, 13-14.
  12. Madawala, P.G., Arambewela, L.S.R., Premakumara G.A.S. and Ratnasooriya, W.D. (1994).  Studies on the sedative activity of crude extract of root bark of Rauwolfia canescens on rats.         J. Ethnopharmacol., 42, 63-65.
  13. Ratnasooriya, W.D., Premakumara, G.A.S., and Tillekeratne, L.M.V., (1994). Post-coital contraceptive activity of crude extracts of Sri Lankan marine red algae. Contraception, 50(3), 291-299
  14. Ratnasooriya, W.D., Premakumara, G.A.S. and Ananda, U.V.D.S. (1995). Protection by Murraya koenigii leaf extract against ethanol induced gastric lesions in rats. Med. Sci. Res., 23, 11-13.
  15. Premakumara, G.A.S., Ratnasooriya, W.D., Tillekeratne, L.M.V.(1995). Studies on the post-coital contraceptive mechanisms of crude extract of Sri Lankan marine red algae, Gelidiella acerosa. Contraception, 52(3), 203-207.
  16. Ratnasooriya, W.D. and Premakumara, G.A.S.(1996). Piper betle leaves impairs masculine sexual behaviour of rats. Med. Sci. Res., 24, 303-306.
  17. Premakumara, G.A.S., Ratnasooriya, W.D., Tillekeratne, L.M.V.(1996). Isolation of non-steroidal contragestative agent from Sri Lankan marine red algae, Gelidiella acerosa. Contraception, 54(6), 379-383.
  18. Ratnasooriya, W.D. and Premakumara, G.A.S.(1998). Piper betle leaves reversibly inhibits fertility of male rats. Vidyodaya J. Science, 7, 15-21.
  19. Weerakoon, S.W., Arambewela, L.S.R., Premakumara, G.A.S., Ratnasooriya, W.D. (1998).  Sedative activity of the crude extract of Rauwolfia densiflora. Pharmaceutical Biology, 36(5), 360-361.
  20. Premakumara, G.A.S., Ratnasooriya, W.D., Tillekeratne, L.M.V., Amarasekare, A.S. and Atta-Ur-Rahman (2001). Human sperm motility stimulating activity of a sulfono glycolipid isolated from Sri Lankan marine red alga Gelidiella acerosa. Asian J Androl 2001 Mar; 3:27-31.
  21. Ratnasooriya W.D., Jayakody, J.R. and Premakumara G.A.S.(2003). Adverse pregnancy outcome in rats following exposure to a Salacia reticulata (Celastraceae) root extract. Braz J Med Biol Res. 2003 Jul;36(7):931-5.
  22. Ratnasooriya W.D., Jayakody, J.R. and Premakumara G.A.S., Ediriweera, E.R.H.S.S..(2005). Antioxidant activity of water extract of Scoparia dulcis. Fitoterapia.76(2005) 220-222.
  23. P. M. Manage, K. S. Guruge, S. Taniyasu, N. Yamashita. S. P. Galbada Arachchige (2005). Accumulation of perfluorooctane sulfonate and related fluorochemicals in fishes from Sri Lanka, Organohalogen Compounds. 2005. 67, 816-817
  24. Premakumara G. Arachchige, Yoko Takahashi and Takashi Ide (2006). Dietary sesamin docosahexaenoic and eicosapentaenoic acids synergistically increase the gene expression of enzymes involved in hepatic peroxisomal fatty acid oxidation in rats. Metabolism Clinical and Experimental, 55(2006), 381-390.
  25. Premakumara GAS. (2006). Discovery of bio-active natural products with special reference to fertility regulating compounds from marine sources. Chemistry in Sri Lanka, 23(3), 19-22.
  26. Marikkar J.M.N., Jayasundara, J.M.M.A, Prasadika, S.A.H., Jayasinghe, C.V.L., Premakumara, G.A.S. (2007). Assessment of the stability of virgin coconut oil during deep-prying. CORD, 23(1), 62-70.
  27. Abesekera, W.K.S.M., Somasiri, H.P.P.S., Premakumara, G.A.S., Bentota, A.P., Rajapakse, D. and Ediriweera, N. (2008). Cooking and eating quality traits of some Sri Lankan traditional rice varieties across Yala & Maha seasons. Tropical Agricultural Research, 20,168-176.
  28. Keerthi, A.A.P., Jansz, E.R., Ekanayake, S. and Premakumara, G.A.S.(2009). The synergistic neurotoxins of palmyrah (Borassus flabellifer L.) flour. Int. J. Biol. Chem. Sci. 3(2): 255-265.
  29. Keerthi, A.A.P., Ekanayake, S. and Premakumara, G.A.S.(2009). A new cytotoxic flabelliferin from palmyrah (Borassus flabellifer L.) flour. J. Natn. Sci. Foundation Sr Lanka. 37(4): 269-271.
  30. Dharmadasa, R.M., Premakumara, G.A.S., Hettiarachchi, P.(2011). Geographical distribution and conservation of a rare medicinal plant Munronia pinnata (Wall)Theob.(Meliaceae) in Sri Lanka. Bangladesh J. Plant Taxon. 18(1):39-49.
  31. Ratnasooriya W.D., Indrajith Somarathna, J.R. Premakumara G.A.S. and Ediriweera, E.R.(2011). Lack of antiglycation activity of fresh juice of whole plant of Enicostema axillare (Lam.) Raynal. J. Pharm Negative Results, 2(2), 55-57.
  32. Kasun Kodippili, Wanigasekera Daya Ratnasooriya, Sirimal Premakumara, Preethi V. Udagama (2011). An investigation of the antimalarial activity of Artemisia vulgaris leaf extract in a rodent malaria model. International Journal of Green Pharmacy, 5(4), 276-281.
  33. Ranasinghe, P., Perera, Y.S.,  Abeywardene, S.H.P.E.L.,  Gunapala, K.N.M.,  Gunatilake, M., Premakumara,G.A.S., Perera, P.R.K., Lokuhetty, D. and Katulanda, P.  (2011). Effects of Cinnamomum zeylanicum (Ceylon cinnamon) on blood glucose and lipids in Sprague-Dawley rats. Ceylon Medical Journal. 56(1): 16.
  34. Wijayasiriwardena C., Premakumara G.A.S.(2012) Comparative powder microscopy of rhizomes of Alpinia galanga & A. calcarata. Ayu journal, Vol. 33, Issue 3 (July-Sep.)
  35. Dharmadasa, R.M., Premakumara, G.A.S., Hettiarachchi, P, Ratnasooriay, W.D.(2012). Cytotoxicity and in vivo antimalarial activity of aqueous whole plant extract of Munronia pinnata (Wall.) Theob.(Meliaceae) in mice. Res. J. Med. Plant., 6(3), 267-273.
  36. Priyanga Ranasinghe, Sanja Perera, Mangala Gunatilake, Eranga Abeywardene, Nuwan Gunapala, Sirimal Premakumara, Kamal Perera, Dilani Lokuhetty, Prasad Katulanda  (2012). Effects of Cinnamomum zeylanicum (Ceylon cinnamon) on blood glucose and lipids in a diabetic and healthy rat model (2012). Pharmacognosy Research, 4(2), 73-79.
  37. Ranasinghe, P., Premakumara GAS, Wijayarathna CD and Ratnasooriya WD, (2012). Antioxidant activity of Caryota urens L.(Kithul) sap. Tropic Agri Res, 23(2), 117-125.
  38. Thavarajah, P., Thavarajah, D., Premakumara GAS and Vandenberg, A.(2012). Detection of common Vetch (Vicia sativa L.) in Lentil (Lens culinaris L.) using unique chemical fingerprint markers. Food Chemistry, 130, 2203-2206.
  39. Priyanga Ranasinghe, Pathmasiri Ranasinghe, W.P.Kaushalya M.Abeysekera,  G.A.Sirimal Premakumara, Yashasvi S. Perera, Padmalal Gurugamage, Saman B. Gunatilake. (2012). In vitro erythrocyte membrane stabilization properties of Carica papaya L. leaf extracts. Pharmacognosy Research, 4(4), 196-202.
  40. Dharmadasa, R.M., Hettiarachchi, P,I.,Premakumara, G.A.S., (2012). Anatomical traits as an additional taxonomic tool for Munronia pinnata (Wall.) Theob.(Meliaceae) found in Sri Lanka. World J Agri. Res., 2(4), 142-150.
  41. Wijayasiriwardena C., Premakumara G.A.S.(2012) Comparative powder microscopy of rhizomes of Alpinia galanga & A. calcarata. Ayu journal, Vol. 33, Issue 3 (July-Sep.)
  42. Wijayasiriwardena C., De Silva W.A.B.N., Premakumara G.A.S.(2013) Standardization of “Trijata Choorna” used in Sri Lankan Traditional Medicine, Ayur Sameeksha,2(8),103-105.
  43. Abeysekera WPKM, Premakumara GAS, and Ratnasooriya WD (2013). In vitro antioxidant properties of bark and leaf extracts of Ceylon Cinnamon (Cinnamomum  zeylanicum Blume), Tropical Agricultural Research, Vol. 24 (2), 128-138 PP.
  44. Bamunuarachchi,Gayan S., Ratnasooriya Wanigasekara D., Premakumara, Sirimal  & Udagama, Preethi V. (2013) Antimalarial properties of Artemisia vulgaris L. ethanolic leaf extract in a Plasmodium berghei murine malaria mode1. J Vector Borne Dis 50(December): 278–284
  45. Premakumara, G.A.S., Abeysekera, W.K.S.M., Ratnasooriya, W.D., Chandrasekharan, N.V., & Bentota. A.P. (2013). Antioxidant, anti-amylase and anti-glycation potential of brans of some Sri Lankan traditional and improved rice (Oryza sativa L.) varieties. Journal of Cereal Science 58 : 451-456.
  46. Priyanga Ranasinghe, Shehani Pigera,  G.A.Sirimal Premakumara, Priyadarshani Galappaththy, Godwin R Constantine, Prasad Katulanda (2013). Medicinal properties of ‘true’ cinnamon (Cinnamomum zeylanicum): a systematic review. BMC Complementary & Alternative Medicine, 13:275.
  47. Bamunuarachchi, Gayan S., Ratnasooriya Wanigasekara D., Premakumara, Sirimal  & & Udagama, Preethi V. (2014). Artemisia vulgaris L. ethanolic leaf extract reverses thrombocytopenia/thrombocytosis and averts end-stage disease of experimental severe Plasmodium berghei murine malaria. Journal of vector borne diseases 51(4):286-293.
  48. Dharmadasa R.M., Hettiarachchi P.L., Premakumara G.A.S.  (2014). Intraspecific Variation and Taxonomic Delimitation of Munronia pinnata (Meliaceae) in Sri Lanka. World Journal of Agricultural Research, 2014, Vol. 2, No. 1, 26-36
  49. Dharmadasa R.M., Hettiarachchi P.L., Premakumara G.A.S.  (2014). Anatomical Traits as an Additional Taxonomic Tool for Munronia pinnata (Wall.) Theob. (Meliaceae) Found in Sri Lanka. World Journal of Agricultural Research, 2014, Vol. 2, No. 4, 142-150
  50. Abeysekera, W.K.S.M., Premakumara, G.A.S., Ahsana Dar; Ratnasooriya, W.D.,  Choudhary, M.I., Kashif,M., Mudassar, C., Ali, S.R .and Chandrasekharan, N.V.(2015). Growth inhibition and cytotoxicity in human lung and cervical cancer cell lines and
  51. Walimuni Kanchana Subhashini Mendis Abeysekera, Sirimal Premakumara Galbada Arachchige, Wanigasekara Daya Ratnasooriya,  Muhammad Iqbal Choudhary, Kourosh Dalvandi, Naduviladath Vishvanath Chandrasekharan. (2015). Anti-diabetic related health food properties of traditional rice (Oryza sativa L.) in Sri Lanka. Journal of Coastal Life Medicine, 3(10), 815-820.
  52. Walimuni Kanchana Subhashini Mendis Abeysekera, Chathura Tissa Dayendra
  53. Kariyawasam, T. I., Godakumbura T. I., Prashantha, M. A. B., Premakumara, G.A.S.(2016).  Proximate composition, calorie content and heavy metals (As, Cd, Pb) of selected Sri Lankan traditional rice (Oryza sativa L.) varieties. Procedia Food Science, 6 (2016), 253 – 256
  54. Kariyawasam, T. I., Godakumbura T. I., Prashantha, M. A. B., Premakumara, G.A.S.(2016).  Effect of parboiling on minerals and heavy metals of selected Sri Lankan traditional rice varieties grown under organic farming. Tropical Agricultural Research & Extension 19 (1), 168-172.
  55. Wijayasiriwardena TDMCK, Herath HMIC, Premakumara GAS. (2016). Morphological and microscopic identification of Curcuma albiflora Thw. J Ayurvedic Herb Med. 2016;2(1):15-19.
  56. W.K.S.M. Abeysekera, G.A.S. Premakumara, A.P. Bentota and D Sumith de Z Abeysiriwardena. (2016). Grain Amylose Content and its Stability over Seasons of Some Traditional and Improved Rice Varieties in the Low Country Wet Zone of Sri Lanka. Journal of Agricultural Sciences. 11(3), 43-50.
  57. Wijayasiriwardena T.D.C.M.K, Herath, H.M.I.C. and Premakumara G.A.S. (2017).
  58. Pahan Indika Godakumbura, Thiloka Ishani Kariyawasam, Prashantha Malavi Arachchi1, Neluka Fernando, Sirimal Premakumara. (2017). In-vitro Antibacterial Activity of Sri
  59. Priyanga Ranasinghe, Ranil Jayawardena,  G.A. Sirimal Premakumara, Prasad Katulanda,  Godwin R Constantine, Priyadarshani Galappaththy. (2017). Evaluation of Pharmacodynamic Properties and Safety of Cinnamomum Zeylanicum (Ceylon Cinnamon) in Health Adults: Study Protocol for a Phase I Clinical Trial. MOJ Bioequi Availab.3(2),0028. DOI: 10.15406/mojbb.2017.03.00028 
  60. Priyanga Ranasinghe, Priyadarshani Galappaththy, Godwin Roger Constantine, Ranil Jayawardena, Hasitha Dhananjaya Weeratunga, Sirimal Premakumara, Prasad Katulanda (2017). Cinnamomum zeylanicum (Ceylon cinnamon) as a potential pharmaceutical agent for type-2 diabetes mellitus: study protocol for a randomized controlled trial. Trials (2017) 18:446
  61. Peshala Gunasekara, S.M. Handunnetti, Sunil Premawansa, E.W.R.A. Witharana, W.M.D.K. Dasanayake, Indra P. Ratnayake, Suranjith L. Seneviratne, R.K.S. Dias,  Premakumara,G.A.S., Rajiva de Silva. (2017). IgE cross-reactivity of phospholipase A2 and hyaluronidase of Apis dorsata (Giant Asian Honeybee) and Apis mellifera (Western Honeybee) venom: Possible use of A. mellifera venom for diagnosis of patients allergic to A. dorsata venom. Toxicon. 137, 27-35.
  62. Ratnasooriya, W.D., Abeysekera, W.K.S.M., Premakumara, G.A.S., Ratnasooriya, C.D.T, Ratnasooriya, S.G. (2017). In vitro anti-collagenase activity of Sri Lankan low grown orthodox Orange Pekoe grade black tea (Camellia sinensi L). Research Journal of Chemical Sciences 7(7),11-15.
  63. Walimuni Prabhashini Kaushalya Mendis Abeysekera, Sirimal Premakumara Galbada Arachchige and Wanigasekera Daya Ratnasooriya. (2017). Bark Extracts of Ceylon Cinnamon Possess Antilipidemic Activities and Bind Bile Acids In Vitro. Evidence-Based Complementary and Alternative Medicine, Article ID 7347219, 10 pages https://doi.org/10.1155/2017/7347219
  64. Abeysekera W.K.S.M., Jayawardana S.A.S., Abeysekera W.P.K.M., Yathursan S., Premakumara G.A.S. and Ranasinghe, P.(2017). Antioxidant potential of selected whole grain cereals consumed by Sri Lankans: a comparative in vitro study. Sri Lankan J. Biol. 2017, 2 (2): 12-24.
  65. Walimuni Kanchana Subhashini Mendis Abeysekera, Sirimal Premakumara Galbada Arachchige, Wanigasekara Daya Ratnasooriya, Naduviladath Vishvanath Chandrasekharan, Amitha Priyadarshani Benthota.(2017). Physicochemical and nutritional properties of twenty-three traditional rice (Oryza sativa L.) varieties of Sri Lanka. Journal of Coastal Life Medicine, 5(8), 343-349.
  66. Sirimal Premakumara Galbada Arachchige, Walimuni Prabhashini Kaushalya Mendis Abeysekera and Wanigasekara Daya Ratnasooriya (2017). Antiamylase, Anticholinesterases, Antiglycation, and Glycation Reversing Potential of Bark and Leaf of Ceylon Cinnamon (Cinnamomum zeylanicum Blume) In Vitro. Evidence-Based Complementary and Alternative Medicine, Article ID 5076029, 13 pages https://doi.org/10.1155/2017/5076029.
  67. Herath H.M.I.C., Wijayasiriwardene T.D.C.M.K., Premakumara GAS. (2017). Comparative GC-MS analysis of all Curcuma species grown in Sri Lanka by multivariate test. Ruhunu J Sci. 2017;(8)1-9.
  68. Herath HMIC, Premakumara GAS, Wijayasiriwardena TDMCK. (2017). Morphological and microscopic analysis of five curcuma species grown. Int J Pharmacogn. 4(7):224-231. doi:10.13040/IJPSR.0975-8232.IJP.4(7).224-31
  69. Abeysekera WKSM, Abeysekera WPKM, Premakumara GAS and Ratnasooriya WD.(2017). Physiological Free Radicals Scavenging Potential of Brans of Selected Sri Lankan Traditional Red Rice (Oryza sativa L.): an In Vitro Antioxidant Activity Study. American Journal of Ethnomedicine, 4(2): 1-6.
  70. Abeysekera, W.K.S.M., Gunasekara, U.K.D.S.S., Premakumara, G.A.S. and Abeysekera, W.P.K.M. (2017). Antioxidant potential of brans of twenty-nine red and white rice (Oryza sativa L.) varieties of Sri Lanka. Journal of Coastal Life Medicine 5(11): 480-485.
  71. Fonseka SI, Adikari S, Jayasekera LR, Ranasinghe P, Premakumara GAS. (2017). Seed germination inhibitory effect of Caryota urens L. seed pericarp on rice and associated weeds. Tropical Plant Research,  4, 2349–9265.
  72. Herath I, Premakumara S, Wijayasiriwardene C. (2017). Anti-inflammatory activity of Curcuma albiflora Thw grown in Sri Lanka. Journal of Ayurveda Medical Sciences,2017,2,4,290-293.
  73. Somarathna T, Premakumara GAS, Akbarsha MA, Balamuthuand K, Weerakkody NS, (2017). In-vitro antibacterial activity of selected underutilized plants and cytotoxic property of Terminalia catappa, International journal of pharmacy and pharmaceutical science, Vol 9, Issue 12, 218225.http://dx.doi.org/10.22159/ijpps.2017v9i12.21835
  74. Herath H.M.I.C. Wiyasiriwardene TDCMK, Premakumara GAS. (2018). In vitro antioxidant and in vivo anti-inflammatory activity of Curcuma albiflora THW. Sri Lankan J Biol. 3(1):24-33. doi:10.7897/2277-4343.06122
  75. Fernando IPS, Sanjeeva KKA, Samarakoon KW, Lee WW, Kim HS, Kim EA, Ranasinghe P, Gunasekara UKDSS, Premakumara GAS and Jeon YJ.(2018). Preliminary screening of two marine algae and sea grass harvested from Sri Lankan waters against LPS-induced inflammatory response in RAW 264.7 macrophages and in vivo zebrafish embryo model.  J. Natn. Sci. Foundation Sri Lanka. 46 (2): 117-122.
  76. Indika Herath, Chandima Wijayasiriwardena, Rakesh Joshi and Sirimal Premakumara (2018). Identification and volatile composition of Curcuma oligantha Trimen (Sri Lanka). American Journal of Essential Oils and Natural Products 2018; 6(2): 11-14
  77. Somarathna, T., Fernando, W.M.A.D.B., Ranaweera K.K.D.S.,Premakumara, G.A.S, Abeysinghe T. and Weerakkody N.S.(2018). Antimicrobial activity and phytochemical screening of Alpinia malaccensis (Ran-kiriya) against food-borne bacteria. J of App. Microbiology, 1-10.
  78. Abeysekera WKSM, Abayarathna UPTC, Premakumara GAS, Jayasooriya MCN and Abeysekera WPKM. (2018). Anti-Glycation and Glycation Reversing Potential of Fenugreek (Trigonella Foenum-Graecum) Seed Extract. Biomed J Sci &Tech Res 3(2); BJSTR.MS.ID.000875. DOI: 10.26717/BJSTR.2018.03.000875.
  79. Abeysekera, W.K.S.M., Premakumara, G.A.S., Ahmed Mesaik, M., Iqbal Choudhary, M., Ratnasooriya, W.D., Chandrasekharan, N.V., Jabeen, A., Soomro, S. (2018). Anti-inflammatory activities of crude bran extracts and fractions of selected traditional red rice (Oryza sativa L.) varieties of Sri Lanka. Advances in Biochemistry and Biotechnology. ABIO-161.
  80. Samaranayake, M.D.W., Abeysekera, W.K.S.M., Liyanage, S.L., Premakumara, G.A.S. , Abeysekera, W.P.K.M., Ratnasooriya, W.D. and D Sumith de Z Abeysiriwardena. (2018). Physicochemical and nutritional properties of selected pigmented and white long grain rice varieties of Sri Lanka at different polishing rates. Res. Journal of Chem. Sci. 8(5): 29-35.
  81. Walimuni Kanchana Subhashini Mendis Abeysekera, Sirimal Premakumara Galbada Arachchige, Sudhair James, Subramaniam Sotheeswaran, Dil Thavarajah and Pushparajah Thavarajah. (2018). Resistant Starch Content of Thirty Eight Selected Rice (Oryza sativa L.) Varieties of Sri Lanka. Journal of Agriculture and Crops. 4(9): 93 – 98.
  82. Indika Herath, Chandima Wijayasiriwardena, Rakesh Joshi and Sirimal Premakumara (2018). Pharmacognostical investigation of Curcuma albiflora Thw: A review (Sri Lanka). American Journal of Essential Oils and Natural Products 2018; 6(4): 18-26
  83. Herath H.M.I.C., Wijayasiriwardene T.D.C.M.K. and Premakumara G.A.S. (2018) Study on effectiveness and user satisfaction of antiinflammatory ointment of Curcuma albiflora Thw. in Bentota divisional secretariat, Southern Sri Lanka. Ruhuna Journal of Science, 9(2): 140-149.
  84. Somarathna T, Ranaweera KKDS, Premakumara GAS, Weerakkody NS (2018).Combination effect of A. malaccensis and T. catappa extract for controlling food borne pathogens and spoilage bacteria on ready to cook vaccum packed raw chicken meat, Journal of food safety. doi.org/10.1111/jfs.12562 e12562
  85. Gihani Jayaweera, Thamasi Makuloluwa, Kamal Perera, Jeeva K. Amararatne, Sirimal Premakumara, Daya Ratnasooriya (2018). Oral diuretic activity of hot water extract of H-grade quills of Cinnamomum zeylanicum blume in rats. Int J Pharm Pharm Sci, 10(10), 114-118.
  86. Vindika Sumudunie Kuruwitaarachchige, Deepthi Inoka Uluwaduge, Sirimal Premakumara, Jayantha Wijayabandara (2018). Cardio protective activity of Abelmoschus esculentus (Okra). International Journal of Food Science and Nutrition. 3(5); 39-43.
  87. Walimuni Prabhashini Kaushalya Mendis Abeysekera, Sirimal Premakumara Galbada Arachchige, Walimuni Kanchana Subhashini Mendis Abeysekera, Wanigasekera Daya Ratnasooriya and Hela Medawattegedara Upeksha Indeewari Medawatta.(2019). Antioxidant and Glycemic Regulatory Properties Potential of Different Maturity Stages of Leaf of Ceylon Cinnamon (Cinnamomum zeylanicum Blume) In Vitro. Evidence-Based Complementary and Alternative Medicine. Volume 2019, Article ID 2693795, 10 pages
  88. Gunasekara P, Handunnetti, S.M., Premawansa S, Kaluarachchi P, Karunatilake C, Ratnayake I.P, Dias R. K. S., Premakumara G. A. S., Dasanayake W. M. D. K., Seneviratne S.L and De Silva R (2019). Diagnosis of Vespa affinis venom allergy: use of immunochemical methods and a passive basophil activation test. Allergy Asthma Clin Immunol. 15:80. https://doi.org/10.1186/s13223-019-0394-6
  89. Shashika Dinethri Kothalawala, Daniya Edward, Jayamini C. Harasgama, Loshini Ranaweera, Ovitigala Vithanage Don Sisira Jagathpriya Weerasena, Roshan Niloofa, Wanigasekera Daya Ratnasooriya, Galbada Arachchige Sirimal Premakumara and Shiroma M. Handunnetti (2020). Immunomodulatory Activity of a Traditional Sri Lankan Concoction of Coriandrum sativum L. and Coscinium fenestratum G. Evidence-Based Complementary and Alternative Medicine Volume 2020, Article ID 9715060, 10 pages. https://doi.org/10.1155/2020/9715060
  90. Abeysekera W K M S, Abeysekera W P K M,  Suraweera T L,  Samaranayake M D W,  Liyanage S L, Arachchige S P G (Premakumara G.A.S.), Ratnasooriya W D and Abeysiriwardena D S de Z.(2020). Antioxidant properties of selected pigmented and white long grain rice varieties of Sri Lanka at market available polishing rates. Tropical Plant Research. 7(2): 415–423.
  91. Madhuvanthi Chandrakanthan, Shiroma M. Handunnetti, Galbada Sirimal Arachchige Premakumara and Selvaluxmy Kathirgamanathar (2020). Topical Anti-Inflammatory Activity of Essential Oils of Alpinia calcarata Rosc., Its Main Constituents, and Possible Mechanism of Action. Evidence-Based Complementary and Alternative Medicine Volume 2020, Article ID 2035671, 19 pages https://doi.org/10.1155/2020/2035671
  92. Somarathna T.,  Fernando, W. M. A. D. B., Ranaweera, K. K. D. S., Premakumara, G. A. S. and Weerakkody N. S. (2020). Antibacterial and antibiofilm activity of Alpinia malaccensis and Terminalia catappa extract combinations on Staphylococcus aureus and Listeria monocytogene strains. Int. J. Appl. Microbiol. Biotechnol. Res. 8(2020), 73-80.
  93. Somarathna T, Thammitiyagodage M.G., Ranaweera K.K.D.S., Premakumara G.A.S., Akbarsha M.A., Kadalmani B. and Weerakkody, N.S.(2021). In Vivo and In Vitro Toxicity Profiles of Hexane Extract of Alpinia malaccensis Rhizome in Rat and Cell Line Models. Journal of Toxicology Volume 2021, Article ID 9578474, 12 pages https://doi.org/10.1155/2021/9578474.
  94. Ilangasingha Gamlathge Nethmini Hansika Senevirathne, Walimuni Kanchana Subhashini Mendis Abeysekera, Walimuni Prabhashini Kaushalya Mendis Abeysekera, Nileththi Yasendra Jayanath, Sirimal Premakumara Galbada Arachchige and Danthasingha Chithra Mulacharige Susantha Indika Wijewardana (2021). Antiamylase, Antiglucosidase, and Antiglycation Properties of Millets and Sorghum from Sri Lanka. Evidence-Based Complementary and Alternative Medicine Volume 2021, Article ID 5834915, 10 pages, https://doi.org/10.1155/2021/583491
  95. Walimuni Kanchana Subhashini Mendis Abeysekera, Wanigasekara Daya Ratnasooriya, Walimuni Prabhashini Kaushalya Mendis Abeysekera and Galbada Arachchige Sirimal Premakumara (2021). Anti-Acetylcholinesterase Activity of Commercially Important Ceylon Black Tea (Camellia sinensis L.) Grades Belonging to Different Elevations: Potential Natural Product for Type 3 Diabetes Management?. Asian Food Science Journal 20(10): 36-46.
  96. Samaranayake M D W, Abeysekera W K S M, Hewajulige I G N, Somasiri H P P S, Mahanama K R R, Dassanayake, Senanayake D M J B, Premakumara G A S (2022). Fatty acid profiles of selected traditional and new improved rice varieties of Sri Lanka. Journal of Food Composition and Analysis, 112 (2022) 104686.
  97. Chanika D. Jayasinghea, Wanigasekera D. Ratnasooriya, Sirimal Premakumara and Preethi V.Udagama. (2022). Platelet augmentation activity of mature leaf juice of Sri Lankan wild type cultivar of Carica papaya L: Insights into potential cellular mechanisms. Journal of Ethnopharmacology, 296 (2022) 115511. https://doi.org/10.1016/j.jep.2022.115511.
  98. Peshala Gunasekara1, S. M. Handunnetti, Sunil Premawansa, E. W. R. A. Witharana, Indra P. Ratnayake, Pradeep Kaluarachchi, Chandima Karunatilake, R. K. S. Dias, G. A. S. Premakumara, W. M. D. K. Dasanayake, Suranjith L. Seneviratne and Rajiva de Silva. (2022). Diagnosis of Apis dorsata venom allergy: use of recombinant allergens of Apis mellifera and a passive basophil activation test. Clinical and Molecular Allergy (2022) 20:11
  99. Abeysekera WKSM, Jayathilaka, S.I., Abeysekera WPKM, Senevirathne IGH, Jayanath NY, Premakumara GAS, Wijewardana DCMSI (2022). In vitro determination of anti-lipidemic, anti-inflammatory, and anti-oxidant properties and proximate composition of range of millet types and sorghum varieties in Sri Lanka. Front. Sustain. Food Syst. 6:884436. doi: 10.3389/fsufs.2022.884436
  100. Abeysekera WPKM, Premakumara GAS, Ratnasooriya WD and Abeysekera WKSM (2022). Anti-infammatory, cytotoxicity and antilipidemic properties: novel bioactivities of true cinnamon (Cinnamomum zeylanicum Blume) leaf. BMC Complementary Medicine and Therapies (2022) 22:259 https://doi.org/10.1186/s12906-022-03728-5
  101. T. M. E. S. Thennakoon, TMES, Abeysinghe PD, Ranasinghe P, Pathirana RN, White A, Fernando WGD, Abeysinghe S, Premakumara S. (2022). Total phenolic content, total flavonoid content and in vitro antioxidant activities measured by the FRAP, ABTS, DPPH and ORAC assays of Sri Lankan black and green tea (Camellia sinensis) infusions. Food Biology, 11: 1-10.
  102. Premakumara G A S and Abeysekera W K S M (2023). Anti-protein glycation and free-radical scavenging properties of Sri Lankan antidiabetic medicinal plant Salacia reticulata L. (Kothala Himbutu). BMC Complementary Medicine and Therapies (2023) 23:394.
  103. Madara Dilrukshi Wijesekara Samaranayake, Walimuni Kanchana Subhashini Mendis Abeysekera Ilmi Ganga Namali Hewajulige, Hewa Pathiranage Preethi Sudarshana Somasiri, Kariyawasam Ranaweerage Ranjith Mahanama, Dassanayake Mudiyanselage Jayantha Bandara Senanayake and Galbada Arachchige Sirimal Premakumara (2024). Grain level characterization of widely cultivating traditional and new improved rice (Oryza sativa L.) varieties of Sri Lanka using physical and chemical test methods. Vegetos (2024). https://doi.org/10.1007/s42535-023-00793-0.
  104. Ruwini Dassanayake, Sudarshana Somasiri, Kariyawasam Mahanama, and Sirimal Premakumara (2024). Fatty Acid and Sterol Profiles of Commonly Available Street Foods in Sri Lanka: Comparison to Other Countries in the Asian Region. Journal of Food Processing and Preservation. Volume 2024, Article ID 7350661, 18 pages. https://doi.org/10.1155/2024/7350661
  105. S.H.S. Karunaratne, G.A.S.I. Abeygunawardena, D.L. Jayaratne, G.A.S. Premakumara (2024). Microbiological quality of different tea grades produced in diverse agro-climatic regions in Sri Lanka. Heliyon 10 (2024) e27878. https://doi.org/10.1016/j.heliyon.2024.e27878.
  106. Hasitha Dhananjaya Weeratunge, Galbada Arachchige Sirimal Premakumara, Egodage Dilip de Silva & Witharanage Wasana Prasadini Rodrigo. (2024). Comparative study on chemical characteristics of essential oils and genetic characteristics of true Cinnamon (Cinnamomum zeylanicum Blume) and three wild Cinnamon species of Sri Lanka. Journal of Essential Oil Research, DOI: 10.1080/10412905.2024.2332379.
  107. S.H.S. Karunaratne, G.A.S.I. Abeygunawardena, D.L. Jayaratne, G.A.S. Premakumara, N.V.Chandrasekharan (2024). Microbiota of black tea at different manufacturing stages. J Food Saf. 2024;44:e13152.. https://doi.org/10.1111/jfs.13152
  108. Kulanayagam Karthigesu, Sivansuthan Sivapalan, Surenthirakumaran Rajendra, Thiyahiny Sunil Navaratinaraja, Vithegi Kesavan and Sirimal Premakumara (2024). Effect of Gymnema lactiferum tea brew on Type 2 diabetes mellitus: A double-blind, randomised active-controlled phase III clinical trial. Clinical Traditional Medicine and Pharmacology. 200164. https://doi.org/10.1016/j.ctmp.2024.200164
  109. Peshala Gunasekara, S.M. Handunnetti, Sunil Premawansa, W.M.D.K. Dasanayake, Indra P. Ratnayake, R.K.S. Dias, G.A.S. Premakumara, Suranjith L. Seneviratne and Rajiva de Silva (2024). Impact of environmental factors on Apis dorsata (Giant Asian Honeybee) venom in Bandarawela, Sri Lanka. Toxicon Available online 8 November 2024, 108163. https://doi.org/10.1016/j.toxicon.2024.108163
  1. Professor – University of Colombo, Sri Lanka (2021-2024)
  2. Chairman – Industrial Technology Institute (CISIR) – Sri Lanka (2020-2024)
  3. Visiting Academic – Southern Cross University – Australia (2019-2020)
  4. Head – Department of Basic Sciences & Social Science, Faculty of Nursing, University of Colombo (2018-2021)
  5. Senior Lecturer Grade 1 – University of Colombo, Department of Basic Sciences & Social Science, Faculty of Nursing, University of Colombo (2018-2021)
  6. Director General/CEO – Industrial Technology Institute (2013-2018)
  7. Research Professor – Industrial Technology Institute (March 2018-May 2018)
  8. Research Fellow – Industrial Technology Institute (2013-2018)
  9. Additional Director General – Research & Development – Industrial Technology Institute (December 2012-January 2013)
  10. Head/Senior Deputy Director – Herbal Technology Section, Industrial Technology Institute(2007-2012)
  11. Principal Research Scientist, Herbal Technology Section,  Industrial Technology Institute (2004-2013)
  12. Senior Research Scientist (Grade II), Natural Products Development Group,  Industrial Technology Institute (2000-2004)
  13. Research Scientist, Natural Products Development Group, Industrial Technology Institute (1997-2000)
  14. Temporary Research Assistant – Dept. of Zoology, University of Colombo (1994-1995)
  15. Research Fellow – Department of Marine Biochemistry, Faculty of Fisheries and Marine Science, University Pertanian Malaysia (1993-1994)
  16. Temporary Teaching Assistant (Demonstrator) – Dept. of Chemistry, University of Colombo July 1993-Nov 1993)
  17. Visiting Research Fellow – HEJ Research Institute of Chemistry, International Centre for Chemical and Biological Sciences,   University of Karachi, Pakistan(Feb 1993-June 1993)
  18. Teaching Assistant (Demonstrator)/Research Assistant – Dept. of Chemistry/Dept. of Zoology University of Colombo (1987-1992)