Prof. K R Ranjith Mahanama
Department of Chemistry
Publications
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Single laboratory validation of determination of 13 trace elements in rice by ICP-MS with an overview of challenges encountered
Chandrasiri, G.U.; Mubarak, M.N.A.; Manthilaka, K.; Mahanama, K.R.R.; [2019]. Single laboratory validation of determination of 13 trace elements in rice by ICP-MS with an overview of challenges encountered. Am. J. Anal. Chem. 10(9), 367-376.
Rapid determination of adulteration in virgin and copra coconut oil using Fourier transform near infrared spectroscopy
Jayathunga, H.G.T.H.; Somasiri, HPPS.; Mahanama, K.R.R.; [2020]. Rapid determination of adulteration in virgin and copra coconut oil using Fourier transform near infrared spectroscopy. Int. J. Food. Sci. Nutr. 5(3), 38-43.
Antioxidant and enzyme inhibitory activities of selected medicinal plants and chemical characterization of phytoceuticals of Atrocarpus nobilis and its topical applications
Antioxidant and enzyme inhibitory activities of selected medicinal plants and chemical characterization of phytoceuticals of Atrocarpus nobilis and its topical applications [2020]. Ms. G.D. Liyanarachchi, Ph.D., University of Colombo. Co-supervisors. Dr. R. Samarasekara, Industrial Technology Institute, Dr. K.D.P. Hemalal, Rocky Mountain Soap Company, Canada.
Analysis of total amino acids in rice using a validated reversed-phase high performance liquid chromatographic method with died array detection (RP-HPLC-DAD)
Liyanaarchchi, G.V.V.; Mahanama, K.R.R.; Somasiri, H.P.P.; Punyasiri, P.A.N.; Kottawa-Arachchi J.D. [2020] Analysis of total amino acids in rice using a validated reversed-phase high performance liquid chromatographic method with died array detection (RP-HPLC-DAD). Int. J. Analyt. Bioanaytl. Methods. 2 (008)
Validation of a reversed-phase high-performance liquid chromatographic method for the determination of free amino acids in rice using L-theanine as the internal standard
Liyanaarchchi, G.V.V.; Mahanama, K.R.R.; Somasiri, H.P.P.; Punyasiri, P.A.N. [2018]. Validation of a reversed-phase high-performance liquid chromatographic method for the determination of free amino acids in rice using L-theanine as the internal standard. Food Chem. 240, 196-203.
Validated method for determination of total amino acids in rice using reversed-phase high performance liquid chromatography (RP-HPLC)
Liyanarachchi, G.V.V.; Mahanama, K.R.R.; Somasiri, H.P.P.S.; Punyasiri, P.A.N. [2019]. Validated method for determination of total amino acids in rice using reversed-phase high performance liquid chromatography (RP-HPLC). Presented at the 11th International Conference & Expo on Chromatography techniques, April 22-24, Dublin, Ireland.
e-waste; The next Tsunami.
Mahanama, K.R.R. [2011]. e-waste; The next Tsunami. Chem. Sri Lanka 28 (1), 57 – 61.
Development of a fluorimetric method for assessing paracetamol in pharmaceutical tablets
Perera, G.W.C.S.; de Costa, M.D.P.; Mahanama, K.R.R.; [2019]. Development of a fluorimetric method for assessing paracetamol in pharmaceutical tablets. J. Photoch Photobio A 368, 248-253.
Validation of a tandem mass spectrometric method for direct analysis of free amino acids in rice
Liyanarachchi, G.V.V.; Mahanama, K.R.R.; Somasiri, H.P.P.S.; Punyasiri, P.A.N. [2018]. Validation of a tandem mass spectrometric method for direct analysis of free amino acids in rice. Presented at the World Congress on Mass Spectrometry and Analytical Techniques, September 19-20, Singapore.
Tyrosinase, elastase, hyaluronidase, inhibitory and antioxidant activity of Sri Lankan medicinal plants for novel cosmeceuticals
Liyanaarchchi, G.D.; Samarasekara, J.K.R.R.; Mahanama, K.R.R.; Hemalal, K.D.P. [2018]. Tyrosinase, elastase, hyaluronidase, inhibitory and antioxidant activity of Sri Lankan medicinal plants for novel cosmeceuticals. Ind. Crops Prod. 111, 597-605.
Study of making compost for organic farming from biological sludge waste of waste water treatment plant
Study of making compost for organic farming from biological sludge waste of waste water treatment plant [2018]. Mr. L. Seneviratne, Master of Environment Management, University of Colombo.
Proposed waste management models for households, schools and municipal councils
Proposed waste management models for households, schools and municipal councils [2018]. Mr. J.M.R.A.B. Jayathilaka, M.Sc. in Chemistry Education, University of Colombo. Co-supervisors: Prof. Namal Priyantha, Dr. Udena Ranathunga. University of Peradeniya.
In vitro pro-inflammatory enzyme inhibitory activities of Artocarpus heterophyllus
Liyanaarchchi, G.D; Samarasekara, R.; Mahanama, K.R.R.; Hemalal, K.D.P. [2018]. In vitro pro-inflammatory enzyme inhibitory activities of Artocarpus heterophyllus Presented at the 5th International Conference on Multidisciplinary Approaches 2018, University of Sri Jayawardenapura, August 31- September 2, Nugegoda.
In vitro pro-inflammatory enzyme inhibitory activities of Artocarpus altills
Liyanaarchchi, G.D; Samarasekara, R.; Mahanama, K.R.R.; Hemalal, K.D.P. [2018]. In vitro pro-inflammatory enzyme inhibitory activities of Artocarpus altills Presented at the 38th Annual Sessions of Institute of Biology, Sri Lanka 2018, September 28, Colombo.
Development of a gas chromatographic fingerprint to investigate the quality of toddy
Development of a gas chromatographic fingerprint to investigate the quality of toddy [2018]. Ms. S. Kulali, M.Sc. in Analytical Chemistry, University of Colombo. Co-supervisor: Ms. G. Ramanah, Government Analyst Department, Colombo.
Development and validation of a method for direct, underivatized analysis of free amino acids in rice using liquid chromatography – tandem mass spectrometry
Liyanaarchchi, G.V.V.; Mahanama, K.R.R.; Somasiri, H.P.P.; Punyasiri, P.A.N. [2018]. Development and validation of a method for direct, underivatized analysis of free amino acids in rice using liquid chromatography – tandem mass spectrometry. J. Chrom. A. 1568, 131-139.
Determination of iodine and saponification value of coconut oil using an FT-NIR technique
Jayathunga, H.G.T.H.; Somasiri, H.P.P.S.; Mahanama, K.R.R. [2018]. Determination of iodine and saponification value of coconut oil using an FT-NIR technique. Presented at the Annual Research Symposium 2018, University of Colombo, November 9, Colombo
Arson investigation by GC/MS detection of petrol traces from different carpet substrates
Arson investigation by GC/MS detection of petrol traces from different carpet substrates [2018]. Mr. W.P.A.R.D. Bandara, M.Sc. in Analytical Chemistry, University of Colombo. Co-supervisor: Mr. A. Welianga, Government Analyst Department, Colombo.
Variation of free amino acid profile among selected traditional rice varieties (Oryza sativa L.) in Sri Lanka cultivated during 2016 maha season
Liyanarachchi, G.V.V.; Mahanama, K.R.R.; Somasiri, H.P.P.S.; Punyasiri, P.A.N. Kottawaarchchi, J.D. [2017]. Variation of free amino acid profile among selected traditional rice varieties (Oryza sativa L.) in Sri Lanka cultivated during 2016 maha season. Presented at the 3rd Biennial Research Symposium 2017, November 16-17, Colombo.
Variation of free amino acid profile among selected traditional rice varieties (Oryza sativa L.) in Sri Lanka
Liyanarachchi, G.V.V.; Mahanama, K.R.R.; Somasiri, H.P.P.S.; Punyasiri, P.A.N. Kottawaarchchi, J.D. [2017]. Variation of free amino acid profile among selected traditional rice varieties (Oryza sativa L.) in Sri Lanka. Presented at the Annual Research Symposium 2016, University of Colombo, November 17, Colombo
Validation of free amino acid profile among selected traditional rice varieties (Oryza sativa L.) in Sri Lanka cultivated during the maha season
Liyanarachchi, G.V.V.; Mahanama, K.R.R.; Somasiri, H.P.P.S.; Punyasiri, P.A.N. Kottawaarchchi, J.D. [2017]. Validation of free amino acid profile among selected traditional rice varieties (Oryza sativa L.) in Sri Lanka cultivated during the maha season, 2016. Presented at the ITI Biennial Research Symposium 2017, November 6, Colombo.
Use of FT-NIR technique to determine the iodine value of edible oil
Jayathunga, H.G.T.H.; Somasiri, H.P.P.S.; Mahanama, K.R.R. [2017]. Use of FT-NIR technique to determine the iodine value of edible oil. Presented at the 3rd Biennial Research Symposium 2017, November 16-17, Colombo.
Rapid determination of adulteration in coconut oil using FT-NIR spectroscopy
Jayathunga, H.G.T.H.; Somasiri, H.P.P.S.; Mahanama, K.R.R. [2017]. Rapid determination of adulteration in coconut oil using FT-NIR spectroscopy. Presented at the International Conference on Food Quality, Safety and Security (FOOD QUALSS 2017, October 24-25, Colombo.
Investigation on potentially hazardous hexavalent chromium and heavy metals in leather products
Premaratne, G.; Rajasinghm, S.; Mahanama, K.R.R. [2017]. Investigation on potentially hazardous hexavalent chromium and heavy metals in leather products. Inter. J. Basic Sci. Appl. Res. 6(1), 19 – 26.
In vitro tyrosinase, hyaluronidase inhibitory and antioxidant activities of Artocarpus heterophyllus
Liyanaarchchi, G.D; Samarasekara, R.; Mahanama, K.R.R.; Hemalal, K.D.P. [2017]. In vitro tyrosinase, hyaluronidase inhibitory and antioxidant activities of Artocarpus heterophyllus. Presented at the Annual Research Symposium 2016, University of Colombo, November 17, Colombo.
Validation of a high performance liquid chromatographic method for the determination of free amino acids in rice using L-theanine as the internal standard
Liyanarachchi, G.V.V.; Mahanama, K.R.R.; Somasiri, H.P.P.S.; Punyasiri, P.A.N. [2016]. Validation of a high performance liquid chromatographic method for the determination of free amino acids in rice using L-theanine as the internal standard. Presented at the Annual Research Symposium 2016, University of Colombo, October 14, Colombo.
Lakmini, M.C; Mahanama, K.R.R.; [2016]. Safety concerns of PbCrO4 in enamel paints. Presented at the Annual Research Symposium 2016, University of Colombo, October 14, Colombo.
Quantitative and qualitative analysis of cyanide in blood by headspace gas chromatography/mass spectroscopy
Quantitative and qualitative analysis of cyanide in blood by headspace gas chromatography/mass spectroscopy [2016]. Ms. H.T.T. Priyadarshani, M.Sc. in Analytical Chemistry, University of Colombo. Co-supervisor: Ms. S. Tennakoon, Government Analyst Department, Colombo.
Method development for analysis of selected pesticide residues in black teaTea Research Institute, Thalawakele
Method development for analysis of selected pesticide residues in black tea [2014]. Mr. A. Premathilaka, M.Sc. in Analytical Chemistry, University of Colombo. Co-supervisor: Dr. N. Punyasiri, Tea Research Institute, Thalawakele.
Investigations on e-waste problem in Sri Lanka: A case study with special reference to Sri Lankan citizens and licensed collectors of e-waste management in Sri Lanka
Investigations on e-waste problem in Sri Lanka: A case study with special reference to Sri Lankan citizens and licensed collectors of e-waste management in Sri Lanka [2016]. Mr. H.L.A.M de Silva, M.Sc. in Disaster Analysis, Management and Mitigation, University of Colombo.