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

Journal Paper
G.V.V. Liyanaarachchi, K.R.R. Mahanama , H.P.P.S. Somasiri, P.A.N Punyasiri
Publication year: 2018

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

Journal Paper
G.V.V. Liyanaarachchi, K.R.R. Mahanama, H.P.P.S. Somasiri and P.A.N. Punyasiri
Publication year: 2018

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

Journal Paper
G. A.A R Perera, , A.M,T Amarakoon, D.C.K Illeperuma, E.N.U Edirisingha and P.A.N Punyasiri
Publication year: 2018

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

Journal Paper
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
Publication year: 2017

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

Journal Paper
K.C Buddhinie, N.Salim, K.H Saranda, P.A Nimal Punyasiri
Publication year: 2017

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

Journal Paper
W. J. Wickramarachchi., R. S. C. G Rajapaksha., K. K. I. Eranga1, J. A Liyanage2, P. A. N.Punyasiri, G. M. W. A. Chandrarathne
Publication year: 2017

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

Journal Paper
Kumar, N. S., Punyasiri, P. A. N., & Wijekoon, W. A. M. B.
Publication year: 2016

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

Journal Paper
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
Publication year: 2016

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

Journal Paper
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
Publication year: 2015

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

Journal Paper
Elisabete Carvalho, P.A. Nimal Punyasiri , H.P.P Sudarshana Somasiri, I. Sarath B. Abeysinghe, Stefan Martens
Publication year: 2014

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

Journal Paper
J.D. Kottawa-Arachchi1, M.T.K. Gunasekare, M.A.B. Ranatunga, P.A.N. Punyasiri and L. Jayasinghe
Publication year: 2014

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

Journal Paper
J.D. Kottawa-Arachchi1, M.T.K. Gunasekare, M.A.B. Ranatunga, P.A.N. Punyasiri and L. Jayasinghe
Publication year: 2013

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

Conference Paper
Brasathe Jeganathan, A  Nimal  Punyasiri, J.  Dananjaya. Kottawa-Arachchi Mahasen. Ranatunga , I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara   
Publication year: 2013

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

Conference Paper
Brasathe Jeganathan, A  Nimal  Punyasiri, J.  Dananjaya. Kottawa-Arachchi Mahasen..  Ranatunga , I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara
Publication year: 2013

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

Conference Paper
Brasathe Jeganathan, A  Nimal  Punyasiri, J.  Dananjaya. Kottawa-Arachchi,  Mahasen Ranatunga , I.Sarath.B.Abeysinghe , M. T. Kumudini Gunasekare , and B.M.Ratnayake Bandara
Publication year: 2013

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

Journal Paper
Miriam Frida Karlsson, Göran Birgersson, Peter Witzgall, Jonas Duus Stevens Lekfeld, P.A. Nimal Punyasiri, Marie Bengtsson
Publication year: 2013

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

Conference Paper
Punyasiri, P.A.N Jeganathan, B, and Madujith, T
Publication year: 2012

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

Conference Paper
Sandaruwan, B.W.P  ,  Samarasinghe,  S.I,  and    Punyasiri,  P.A.N,  
Publication year: 2012

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

Standards of Tea for ensuring market requirement

Conference Paper
Punyasiri, A.N
Publication year: 2011

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

Conference Paper
Jeganathan, B, Punyasiri, A.N and Madujith, T
Publication year: 2011

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

Conference Paper
Punyasiri, A.N, Somasiri, H.P.P.S, Thotawattage, G, Abeysinghe , I.S.B and Amarakoon, A.M.T
Publication year: 2011

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

Quantification of L-Theanine Content in Sri Lankan Tea

Conference Paper
P.A  Nimal  Punyasiri  ,  H.P.P  Sudharshana  Somasiri  ,  Ganeesha  Thotawattage  I.Sarath.B Abeysinghe , and A.M Tissa Amarakoon
Publication year: 2010

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

Conference Paper
Punyasiri, P.A.N, Somasiri, H.P.P.S, Thotawattage, G, Abeysinghe , I.S.B and Amarakoon, A.M.T
Publication year: 2010

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

Conference Paper
L.N Gunewardena, Ganeesha Thotawattage , P.A.Nimal Punyasiri, I.Sarath.B Abeysinghe and C.Abeysinghe
Publication year: 2010

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

Conference 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
Publication year: 2010

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

Journal Paper
Kumar, N.S, Wijekoon, M, Punyasiri, P.A.N., Kumar, V, Abeysinghe, I.S.B.,
Publication year: 2009

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

Conference Paper
Wijekoon,  W.M.A.M.B.;  Kumar,  N.S.;  Kumar,  V.;Punyasiri,  P.A.N.;  and  Abeysinghe,  I.S.B
Publication year: 2008

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

Host-finding in potato cyst nematodes

Conference Paper
Farnier K, Punyasiri N, Bengtsson, M, Witzgall, P and Manduric, S
Publication year: 2008

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

Conference Paper
Mohotti  A.  J.,  Somarathna  K.  M.  S.  H.  and  Punyasiri  P.  A.  N.  
Publication year: 2008

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

Allelochemicals in tea (Camellia sinensis L.) grown soils

Conference Paper
Mohotti A. J., Amarathunga A. M. and Punyasiri P. A. N.
Publication year: 2008

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