Prof. P.A. Nimal Punyasiri
Institute of Biochemistry, Molecular Biology and Biotechnology (IBMBB)
Publications
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Profiling of amino acids in traditional and improved rice (Oryza sativa L.) varieties of Sri Lanka and their health promoting aspects
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/
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
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
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
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.
Applying membrane filtration technique in manufacturing cold water soluble instant black tea
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
Genotypic variation in biochemical compounds of the Sri Lankan Tea (Camellia sinensis L.) accessions and their relationships to quality and biotic stresses
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),
Effect of papaya ring spot virus infection on the fruit quality of tolerant papaya variety, Red Lady
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
Clinical Study on the effectiveness of Rajayu Herbal Wellness Brews (Cholesterol Fighter and Sugar Regulator
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
The hexane-ethyl acetate-methanol-water system for the separation of theaflavins from black tea (Camellia sinensis) using high-speed counter-current chromatography
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
Genetic Variation of Flavonols : Quercetin, Myricetin and Kaempferol in the Sri Lankan Tea (Camellia sinensis L.) and Their Health-Promoting Aspects
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
Optimization of Sampling Methodology for Metabolite Profiling of Sri Lankan Tea
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
Quantification of γ-Aminobutyric Acid in Sri Lankan Tea by Means of Ultra Performance Tandem Mass Spectrometry
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
Biochemical charaterisation of tea (Camellia L spp) germplasm accessions in Sri Lanka: correlation between black tea parameters and organoleptic evaluation
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
Use of biochemical compounds in tea germplasm characterization and its implications in tea breeding in Sri Lanka
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
Quantification of Major Metabolites of the Sri Lankan Tea Germplasm
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.
Optimization of Sampling Methodology for Metabolite Profiling of Sri Lankan Tea
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. ??
Metabolomics of Sri Lankan Tea Germplasm: Quantitative Analysis of Catechins, Gallic Acid and Caffeine
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 ??
Guatemalan potato moth Tecia solanivora distinguish odour profiles from qualitatively different potatoes Solanum tuberosum
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.
Quantification of f Quercetin, Myricetin and Kaempferol in Sri Lankan Tea
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
A study of the interactions of milk with different grades of black tea and determination of their antioxidant properties
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
Quantification of total polyphenols and flavonols in Sri Lankan Tea
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
L-Theanine Content in Sri Lankan Performance Liquid Chromatography Using O- Pthaladehyde Derivatization
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
L-Theanine content in Sri Lankan Tea – An Effective Marketing tool
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
Improving the quality of Sri Lankan Silver tips and white tea
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
Chemodiversity of Sri Lankan Tea Germplasm; 1. Preliminary Quantification of Principle Metabolites using high throughput High Performance Liquid Chromatographic Method
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
Separation of proanthocyanidins in tea leaf by high speed counter current chromatography
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.
Separation of proanthocyanidins from tea leaves using High-speed Counter-current Chromatography
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
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
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