G. V. V. Liyanaarachchi, K. R. R. Mahanama, H. P. P. S. Somasiri, P. A. N. Punyasiri, K. A. K. Wijesena
J. D. Kottawa‑Arachchi (2021). Profiling of amino acids in traditional and improved rice (Oryza sativa
L.) varieties of Sri Lanka and their health promoting aspects Cereal Research Communications
https://doi.org/10.1007/
G.V.V. Liyanaarachchi, K.R.R. Mahanama , H.P.P.S. Somasiri, P.A.N Punyasiri (2018) Validation of a reverse-phase high-performance liquid chromatography method for the determination of free amino acids in rice using L-Theanine as the internal standard. Food Chemistry, Food Chemistry, 240, 196-201
G.V.V. Liyanaarachchi, K.R.R. Mahanama, H.P.P.S. Somasiri and P.A.N. Punyasiri (2018). Development and Validation of a Method for Direct, Underivatized Analysis of Free Amino Acids in Rice using Liquid Chromatography-Tandem Mass Spectrometry(LC-MS/MS).J of Liquid Chromatography.A, 1568, 131-139.
G. A.A R Perera, , A.M,T Amarakoon, D.C.K Illeperuma, E.N.U Edirisingha and P.A.N Punyasiri (2018). Applying membrane filtration technique in manufacturing cold water soluble instant black tea. Under Review – J of Food Science and Technology
P.A Nimal Punyasiri, Brasathe Jeganathan, J. Dananjaya. Kottawa-Arachchi Mahasen.. Ranatunga , I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara (2017). Genotypic variation in biochemical compounds of the Sri Lankan Tea (Camellia sinensis L.) accessions and their relationships to quality and biotic stresses. J of Horticultural Science and Biotechnolgy, Volume 92 (5),
K.C Buddhinie, N.Salim, K.H Saranda, P.A Nimal Punyasiri (2017). Effect of papaya ring spot virus infection on the fruit quality of tolerant papaya variety, Red Lady, Asian Journal of science and Technology, Volume 80 (10), 5874-5880
W. J. Wickramarachchi., R. S. C. G Rajapaksha., K. K. I. Eranga1, J. A Liyanage2, P. A. N.Punyasiri, G. M. W. A. Chandrarathne (2017). Clinical Study on the effectiveness of Rajayu Herbal Wellness Brews (Cholesterol Fighter and Sugar Regulator), Int’l Journal of Advances in Chemical Engg., & Biological Sciences (IJACEBS) Vol. 4, Issue 1 (2017) ISSN 2349-1507 EISSN 2349-1515
Kumar, N. S., Punyasiri, P. A. N., & Wijekoon, W. A. M. B. (2016). The hexane-ethyl acetate-methanol-water system for the separation of theaflavins from black tea (Camellia sinensis) using high-speed counter-current chromatography. Ceylon Journal of Science, 45(2), 79–86
Brasathe Jeganathan, P.A Nimal Punyasiri, J. Dananjaya. Kottawa-Arachchi Mahasen.. Ranatunga I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara (2016). Genetic Variation of Flavonols : Quercetin, Myricetin and Kaempferol in the Sri Lankan Tea (Camellia sinensis L.) and Their Health-Promoting Aspects. International Journal of Food Science. Article ID 6057434, 9 pages, http://dx.doi.org/10.1155/2016/6057434
P.A Nimal Punyasiri, Brasathe Jeganathan, J. Dananjaya. Kottawa-Arachchi Mahasen.. Ranatunga I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara (2015). Optimization of Sampling Methodology for Metabolite Profiling of Sri Lankan Tea. Journal of Analytical Methods in Chemistry, ID 964341, 6 pages. http://dx.doi.org/10.1155/2015/964341
Elisabete Carvalho, P.A. Nimal Punyasiri , H.P.P Sudarshana Somasiri, I. Sarath B. Abeysinghe, Stefan Martens (2014). Quantification of γ-Aminobutyric Acid in Sri Lankan Tea by Means of Ultra Performance Tandem Mass Spectrometry. Natural Products Communications, 9(4), 525-528
J.D. Kottawa-Arachchi1, M.T.K. Gunasekare, M.A.B. Ranatunga, P.A.N. Punyasiri and L. Jayasinghe (2014). Biochemical charaterisation of tea (Camellia L spp) germplasm accessions in Sri Lanka: correlation between black tea parameters and organoleptic evaluation. International Journal of Tea Science, 10 (1), 3-13
J.D. Kottawa-Arachchi1, M.T.K. Gunasekare, M.A.B. Ranatunga, P.A.N. Punyasiri and L. Jayasinghe (2013). Use of biochemical compounds in tea germplasm characterization and its implications in tea breeding in Sri Lanka. J.Natn.Sci.Foundation Sri Lanka 41 (4): 309-318
Miriam Frida Karlsson, Göran Birgersson, Peter Witzgall, Jonas Duus Stevens Lekfeld, P.A. Nimal Punyasiri, Marie Bengtsson (2013). Guatemalan potato moth Tecia solanivora distinguish odour profiles from qualitatively different potatoes Solanum tuberosum , Phytochemistry, 85, 72-102.
Kumar, N.S, Wijekoon, M, Punyasiri, P.A.N., Kumar, V, Abeysinghe, I.S.B., (2009). Separation of proanthocyanidins in tea leaf by high speed counter current chromatography. J.Chromatography,1216, 4295-4302.
Pfeiffer, J., Kühnel, C., Puhl, I., Duy, D., Punyasiri, P.A.N., Treutter, D., Forkmann, G., Fischer, T. (2006). Biosynthesis of catechins by leucoanthocyanidin reductases and anthocyanidin reductases in grape (Vitis vinifera), apple (Malus x domestica) and some other crops. Plant Physiology and Biochemistry 44, 323-334.
Punyasiri, P.A.N., Abeysinghe, I.S.B., Kumar. (2005). Preformed and Induced Chemical Resistance of tea plant against Exobasidium vexans infection. Journal of Chemical Ecology 31,1315-1323.
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: Properties of prominent Epicatechin and Catechin Pathways. Archives of Biochemistry and Biophysics 431 (1), 22-30.
Punyasiri, P.A.N., Tanner.G, Abeysinghe, I.S.B., Kumar, V., Campbell, P.M and Pradeepa, N.H.L (2004). Exobasidium vexans infection of leaves of tea (Camellia sinensis) increases 2,3-cis isomers and gallate esterification of proanthocyanidins Phytochemistry 65, 2987–2994.
Liyange A.C, Punyasiri, P.A.N, Bandara, U.B.S and Mohamed, M.T Ziyad (2003). Two-stage drying of black tea using microwave energy. Sri Lanka Journal of Tea Science, 68 (2), 27-33
Liyange A.C, Punyasiri, P.A.N, Bandara, U.B.S and Mohamed, M.T Ziyad (2003). Microwave drying of black tea. Sri Lanka Journal of Tea Science, 68 (2), 34-43.
Liyange A.C, Punyasiri, P.A.N, Perera, P.S,F and Mohamed, M.T Ziyad (1997). Study of the changes of ployphenol oxidase and peroxidase activity during drying and storage of tea. Sri Lanka Journal of Tea Science, 65 (2), 56-66.
Nagahaulla, S.M, Herath, N.L and Punyasiri, P.A.N (1996). A Preliminary study of the phytoalexins produced in the tea leaf in relation to blister blight leaf disease caused by Exobasidium vexans of Tea. Sri Lanka Journal of Tea Science, 64 (1/2), 5-11.
Liyange A.C, Punyasiri, P.A.N (1993). High performance liquid chromatography of chlorophylls in tea leaf (Camellia sinensis). Sri Lanka Journal of Tea Science, 62 (1), 32-37.
Herath, N.L, Punyasiri, P.A.N and De Silva, M.J (1993). Correlation of major flavanols of some tea cultivars with quality of tea. Sri Lanka Journal of Tea Science, 62 (1), 4-10.
Punyasiri, P.A.N, Herath, N.L and Amarakoon, A.M. T (1990). An improved procedure for the separation of flavanols from tea leaves. Sri Lanka Journal of Tea Science, 59 (1), 24-28.
Kathirvetpillai, A and Punyasiri, P.A.N (1989). Effect of additives on the phytoxicity of glyphosate to Panicum repens. Sri Lanka Journal of Tea Science, 62 (1), 4-10.
Ananthacumaraswamy, A, Lakshmie, M.S.D and Punyasiri, P.A.N (1988). Effect of interplanting dadaps (Erythrina lithoperma) in tea (Camellia sinensis) on soil physical properties of an ultisol. Sri Lanka Journal of Tea Science, 57 (1), 11-15.
Ananthacumaraswamy, A, Watson, M, Amarasekara, A.R and Punyasiri, P.A.N (1986). The influence of methods of weed management in tea on the surface layer properties of an ultisol. Sri Lanka Journal of Tea Science, 55 (1) 28-35.
Sandanam, S, Punyasiri, P.A.N and Gamage A.K (1985). Use of Oxyflurfen as pre-emergent weed killer in young tea. Sri Lanka Journal of Tea Science, 54 (2), 73-77.