Profiling of amino acids in traditional and improved rice (Oryza sativa L.) varieties of Sri Lanka and their health promoting aspects

Journal Paper
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
Publication year: 2021

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/s42976-020-00125-x ORIGINAL PAPER

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

 

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.

 

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.

Biosynthesis of catechins by leucoanthocyanidin reductases and anthocyanidin reductases in grape (Vitis vinifera), apple (Malus x domestica) and some other crops

Journal Paper
Pfeiffer, J., Kühnel, C., Puhl, I., Duy, D., Punyasiri, P.A.N., Treutter, D., Forkmann, G., Fischer, T.
Publication year: 2006

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.

Preformed  and  Induced  Chemical Resistance of tea plant against Exobasidium vexans infection

Journal Paper
Punyasiri,  P.A.N.,  Abeysinghe,  I.S.B.,  Kumar.  
Publication year: 2005

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.

Flavonoid Biosynthesis in the Tea plant Camellia sinensis: Properties of prominent Epicatechin and Catechin Pathways

Journal Paper
Punyasiri, P.A.N., Abeysinghe, I.S.B., Kumar, V., Treutter, D., Duy, D., Gosch, C., Maretns, S., Forkmann, G., and Fischer, T.C.
Publication year: 2004

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.

Exobasidium vexans infection of leaves of tea (Camellia sinensis) increases 2,3-cis isomers and gallate esterification of proanthocyanidins

Journal Paper
Punyasiri, P.A.N., Tanner.G, Abeysinghe, I.S.B., Kumar, V., Campbell, P.M and Pradeepa, N.H.L
Publication year: 2004

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.

Two-stage drying of black tea using microwave energy

Journal Paper
Liyange A.C, Punyasiri, P.A.N, Bandara, U.B.S and Mohamed, M.T Ziyad
Publication year: 2003

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

Microwave drying of black tea

Journal Paper
Liyange A.C, Punyasiri, P.A.N, Bandara, U.B.S and Mohamed, M.T Ziyad
Publication year: 2003

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.

Study of the changes of ployphenol oxidase and peroxidase activity during drying and storage of tea

Journal Paper
Liyange A.C, Punyasiri, P.A.N, Perera, P.S,F and Mohamed, M.T Ziyad
Publication year: 1997

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.

A Preliminary study of the phytoalexins produced in the tea leaf in relation to blister blight leaf disease caused by Exobasidium vexans of Tea

Journal Paper
Nagahaulla, S.M, Herath, N.L and Punyasiri, P.A.N
Publication year: 1996

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.

High performance liquid chromatography of chlorophylls in tea leaf (Camellia sinensis)

Journal Paper
Liyange A.C, Punyasiri, P.A.N
Publication year: 1993

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.

Correlation of major flavanols of some tea cultivars with quality of tea

Journal Paper
Herath, N.L, Punyasiri, P.A.N and De Silva, M.J
Publication year: 1993

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.

An improved procedure for the separation of flavanols from tea leaves

Journal Paper
Punyasiri, P.A.N, Herath, N.L and Amarakoon, A.M. T
Publication year: 1990

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.

 

Effect of additives on the phytoxicity of glyphosate to Panicum repens

Journal Paper
Kathirvetpillai, A and Punyasiri, P.A.N
Publication year: 1989

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.

 

Effect of interplanting dadaps (Erythrina lithoperma) in tea (Camellia sinensis) on soil physical properties of an ultisol

Journal Paper
Ananthacumaraswamy, A, Lakshmie, M.S.D and Punyasiri, P.A.N
Publication year: 1988

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.

The influence of methods of weed management in tea on the surface layer properties of an ultisol

Journal Paper
Ananthacumaraswamy, A,  Watson,  M,  Amarasekara, A.R  and  Punyasiri,  P.A.N
Publication year: 1986

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.

Use of Oxyflurfen as pre-emergent weed killer in young tea

Journal Paper
Sandanam, S, Punyasiri, P.A.N and Gamage A.K
Publication year: 1985

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.