Brasathe Jeganathan, A  Nimal  Punyasiri, J.  Dananjaya. Kottawa-Arachchi Mahasen. Ranatunga , I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara    (2013). Quantification of Major Metabolites of the Sri Lankan Tea Germplasm. In Proceeding of the Annual Research Sessions, IBMBB, University of Colombo, 3rd May, Colombo, Sri Lana. Abstract.

Brasathe Jeganathan, A  Nimal  Punyasiri, J.  Dananjaya. Kottawa-Arachchi Mahasen..  Ranatunga , I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara (2013). Optimization of Sampling Methodology for Metabolite Profiling of Sri Lankan Tea. . Proceedings of the Peradeniya University Research Sessions. Abstract -– to be presented in July2013. ??

Brasathe Jeganathan, A  Nimal  Punyasiri, J.  Dananjaya. Kottawa-Arachchi,  Mahasen Ranatunga , I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara (2013). Metabolomics of Sri Lankan Tea Germplasm: Quantitative Analysis of Catechins, Gallic Acid and Caffeine. Proceedings of the Peradeniya University Research Sessions. Absract – to be presented in July2013 ??

Punyasiri, P.A.N Jeganathan, B, and Madujith, T (2012). Quantification of f Quercetin, Myricetin and Kaempferol in Sri Lankan Tea. In Proceedings of International Conference in Chemical Sciences, 22-24 June 2012, Colombo, Sri Lanka.Abstract

Sandaruwan, B.W.P  ,  Samarasinghe,  S.I,  and    Punyasiri,  P.A.N,  (2012).  A  study  of  the interactions of milk with different grades of black tea and determination of their antioxidant properties. In Proceedings of International Conference in Chemical Sciences, 22-24 June 2012. Full Paper

Punyasiri, A.N (2011). Standards of Tea for ensuring market requirement. Proceedings of the 223rd Experiments and Extension Forum. 29th  July 2011, Tea Research Institute of Sri Lanka, Talawakelle. Full Paper

Jeganathan, B, Punyasiri, A.N and Madujith, T (2011). Quantification of total polyphenols and flavonols in Sri  Lankan  Tea.  In  Proceedings of  the  Peradeniya University Research Sessions PURSE, 21-23 September 2011. Absract

Punyasiri, A.N, Somasiri, H.P.P.S, Thotawattage, G, Abeysinghe , I.S.B and Amarakoon, A.M.T (2011). L-Theanine Content in Sri Lankan Performance Liquid Chromatography Using O- Pthaladehyde Derivatization. In Proceeding of the 12th Government Food Analysts conference, 21-25th February, 2011, Brisbane, Australia. Abstarct

P.A  Nimal  Punyasiri  ,  H.P.P  Sudharshana  Somasiri  ,  Ganeesha  Thotawattage  I.Sarath.B Abeysinghe , and A.M Tissa Amarakoon (2010). Quantification of L-Theanine Content in Sri Lankan Tea, In Proceedings of the 3rd Symposium of plantation crop research, 30-1 Sept-Oct, 2010, Colombo, Sri Lanka. Full Paper

Punyasiri, P.A.N, Somasiri, H.P.P.S, Thotawattage, G, Abeysinghe , I.S.B and Amarakoon, A.M.T (2010). L-Theanine content in Sri Lankan Tea – An Effective Marketing tool. In Proceedings of Symposium on Moulding Chemical Education for National Development in Sri Lanka, 17th June, 2010, Colombo, Sri Lanka. Abstract

L.N Gunewardena, Ganeesha Thotawattage , P.A.Nimal Punyasiri, I.Sarath.B Abeysinghe and C.Abeysinghe (2010), Improving the quality of Sri Lankan Silver tips and white tea. In Proceedings of the 10th Symposium of the Wayamba University, Sri Lanka 12-13th August 2010. Full Paper

A Nimal  Punyasiri,  Brasathe  Jeganathan  J.  Dananjaya.  Kottawa-Arachchi Mahasen.  A.  B.Ranatunga , I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara Chemodiversity of Sri Lankan Tea Germplasm; 1. Preliminary Quantification of Principle Metabolites using high throughput High Performance Liquid Chromatographic Method. Accepted for publication In Proceedings of the 4th Symposium of plantation crop research, 20-21 Sept 2010 Colombo, Sri Lanka. Full Paper

Wijekoon,  W.M.A.M.B.;  Kumar,  N.S.;  Kumar,  V.;Punyasiri,  P.A.N.;  and  Abeysinghe,  I.S.B (2008). Separation of proanthocyanidins from tea leaves using High-speed Counter-current Chromatography. 5th  International Conference on  Counter Current Chromatography, ,24-29July,Rio de Janeiro, Brazil. Abstract

Farnier K, Punyasiri N, Bengtsson, M, Witzgall, P and Manduric, S (2008). Host-finding in potato cyst nematodes. In Proceedings of International Congress of Nematology, Brisbane, Australia, 13th to 18th July 2008. Abstract

Mohotti  A.  J.,  Somarathna  K.  M.  S.  H.  and  Punyasiri  P.  A.  N.  (2008).  Association  of allelochemicals in soil and roots of field-grown mature tea (Camellia sinensis L.) showing yielddecline and dieback in high elevation of Sri Lanka. In: Proceedings of the 28th Annual Sessions of the Institute of Biology, held on 26 September, 2008, Colombo, Sri Lanka, 34. Abstract

Mohotti A. J., Amarathunga A. M. and Punyasiri P. A. N. (2008). Allelochemicals in tea (Camellia sinensis L.) grown soils. In: Proceedings of the 28th Annual Sessions of the Institute of Biology, held on 26 September, 2008, Colombo, Sri Lanka, 32. Abstract

Wijekoon, W.M.A.M.B, Kumar N.S. and Punyasiri, P.A.N (2007). High-Speed Counter-Current Chromatography for the Isolation of proanthocyanidins from tea flush. In Proceedings of the Peradeniya University Research Sessions Purse 2007 , 292. Full Paper

Punyasiri, P.A.N., Tanner.G, Abeysinghe, I.S.B., Kumar, V., Campbell, P.M and Pradeepa, N.H.L (2004). Preformed and Induced Chemical Resisatnce of tea plant against Exobasidium vexans infection. In Proceedings of first Symposium on Plantation Crop Research, July 8-9, 2004, Colombo, Sri Lanka. Full Paper

Punyasiri, P.A.N., Abeysinghe, I.S.B., Kumar, V, Pradeepa , N.H.L (2004). Host Responses to infection by Exobasidium vexasns in the tea leaves (Camellia sinensis). In Proceedings of International Conference on Biodiversity and Natural Products, 26–31 January 2004, New Delhi; India Abstract

Punyasiri, P.A.N., Abeysinghe, I.S.B., Kumar, V., Treutter, D., Duy, D., Gosch, C., Maretns, S., Forkmann, G., and Fischer, T.C. (2004). Flavonoid Biosynthesis in the Tea plant Camellia sinensis: In Polyphenol Communications, 22nd International Conference on Polyphenols, August 24-29,2004 Helsinki, Finland. Abstract

Punyasiri, P.A.N., Abeysinghe, I.S.B., Kumar, V., Treutter, D., Duy, D., Gosch, C., Maretns, S., Forkmann, G., and Fischer, T.C. (2004). Flavonoid Biosynthesis in the Tea plant Camellia sinensis: In  Proceedings  of  the  AFASSA  Regional  Symposium  on  Natural  Products,  June  16-19, 2004,Peradeniya, Sri Lanka. Abstract

Punyasiri, P.A.N., Abeysinghe, I.S.B., Kumar, V. (2001). Chemical and biochemical basis of the resistance and susceptibility of Sri Lankan tea cultivars to blister blight leaf disease (Exobasidium vexans).  In:  Proceedings  of  International  Symposium  on  Tea  Culture,  October  4-9,2001, Shizuoka, Japan. Full Paper

Punyasiri, N, Kariyawasam, W and Herath, N (1988). A New procedure for the separation of unoxidized polyphenol from the fresh tea flush using thin layer chromatography. Proceedings of the44th   Annual Sessions, Sri  Lanka Society for  Advancement of  Science, Section E–2  (E2-43),207.Abstract