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Projects

Critical review on biological processes for urea production

Name : Boteju R.S.
Supervisor / Co-supervisor : Dr. Manipura

Nitrogen is a vital source for the flora as well as the fauna for their metabolic activities. Considering the necessity of nitrogen in agricultural industries, urea is the mostly applied fertilizer to fulfill the nitrogen requirement. But urea is produced under adverse conditions such as under high pressure and high temperature. Moreover, there is naturally occurring nitrogen fixation mechanism, which catalyses by the nitrogen fixing microorganisms. The present study focuses on the nitrogen fixation mechanism by the bacterium Azotobactor. Nitrogen fixation efficiency is defined as the amount of nitrogen fixed in a certain period of time. The rate of fixation is depended on
the bacterial growth conditions. Thus, experiments are done by varying the pH of the culture medium. Then, nitrogen fixation is measured with the bacterial state of growth by Acetylene reduction assay.

Tubular photobioreactor for culturing microalgae

Name : Jayawardhana E.P.S.I.
Supervisor / Co-supervisor : Dr. CS Kalpage & Dr. M. Danthurabandara

Preliminary conditions for the growth of microalgae Specie Chlorella in tubular photobioreactor was examined. First, three water sample from different water sources were tested for chlorella growth in 250 ml conical flasks in laboratory conditions. Distilled water, Tap water and Waste water were the tested water samples. Waste water was selected as the best water source for chlorella growth. Tap water was observed as the worst water source for chlorella growth. Selected waste water source and M-8 Growth media was used for preparing sample culture which will be used to inoculate the Photobioreactor experiments. Growth media contamination with fungus was identified as the main problem encountered in the research. It could be prevented using Proper sterilization methods for equipments and growth media such as Autoclaving. The Photobioreactor available in the Department of Chemical and Process Engineering was Modified. Optimum condition for Light intensity (3.92 kLux), temperature (35oC) reported by Kalana et al, 2015 will be maintained in the future experiments. Synthetic waste water media will be used for culturing Chlorella in photo-bioreator which has a capacity of 20L. Different Compressed air flow rates will be used for the photo-bioreactor to change the velocity of culture and Growth of chlorella will be examined and modeled with the compressed air flow rate.

Energy generation from waste water using microbial fuel cell

Name : Dharmasekara I.H.L.S.
Supervisor / Co-supervisor : Dr. A. Manipura

Consumption of fossil fuels has been increased dramatically during the last century and the current methods of energy production are not sustainable as fossil fuel resources are rapidly depleted. However, various new technologies used in wastewater treatment can be used to remove pollutants while energy is produced. Microbial fuel cell (MFC) is one such method involved in wastewater treatment through a bio-electrochemical reaction while producing the electricity as a byproduct. In this study, domestic wastewater is treated using a dual chamber microbial fuel cell. The anode chamber is maintained under anaerobic condition and methylene blue is used as mediator. Commonly available materials were used to construct and operate the MFC. Saccharomyces cerevisiae was used as the microorganism and carbon rods from pencils were used as electrodes. A ceramic plate (porcelain septum) is taken as the proton exchange membrane (PEM).

Study of Adsorption and desorption of prosperous on biochar

Name : Dissanayake D.A.T.U.
Supervisor / Co-supervisor : Dr. C.S. Kalpage & Dr. D.G.G.P. Karunarathne

Phosphorous is an essential nutrient for the development of living organisms and used for many industries, mostly for fertilizer industry. Because of the population growth, urbanization and development of industries, use of phosphorus is being increased and also the amount of phosphorus in wastewater streams. Due to high concentration of phosphorus in water sources, water quality deteriorates and eutrophication occurs in natural water bodies. Also with the continuation of use of phosphorus reserves on earth reduces which necessitate the need to recover phosphorus from wastewater. In this research, the ability of biochar to adsorb phosphorus from environment and desorb when the environment concentration is law will be studied. Also the dependency of adsorption rates on initial concentration, initial pH and temperature will be investigated. In this study adsorption and desorption capacity of phosphorus onto biochar made from sawdust, paddy husk and guinea grass will be investigated. At room temperature adsorption batch experiments will be conducted to determine the best adsorbent. Kinetic experiments and equilibrium experiments will be conducted on all three biochar at room temperature and for the biochar presenting best adsorbent capability, equilibrium experiments at 30 deg C will be performed. The adsorption with initial solution pH variation will be examined too. C and 40 deg C

Optimization of Cinnamon bark oil production by direct steam distillation method

Name : Kankanthri K.C.
Supervisor / Co-supervisor : Dr. C.S. Kalpage

The percentage yield of Cinnamon bark oil distillation by traditional water and steam distillation method is as low as 1%. In this work, a new process design and operation for steam distillation of essential oils that increases oil yield was developed. During preliminary studies, the percentage yield of Cinnamon bark oil distillation was optimized up to 1.6% using a laboratory scale steam distillation apparatus with a steam flow rate of 12 (kg steam) (kg Cinnamon) -1 h -1 . The high steam flow-rate of 12 cannot be justified environmentally though the yield has increased up to 1.6. The reasons can be high heat loss of the biomass flask and the lack of control of steam flow rate. For further studies, an apparatus was newly designed and fabricated by suppressing heat loss in still and facilitating the option of controlling steam flow rate during extraction tests. A packed bed of raw materials, as opposed to water and steam distillation method was used.

Design and fabrication of a spinning disk reactor for synthesis of Nano particles

Name : Karunarathna N.D.B.G.
Supervisor / Co-supervisor : Dr. D.G.G.P. Karunarathna & Dr. A. Manipura

Calcium carbonate particle size is varying with its operating parameters. Rotational speed, Viscosity of the reagent, Radius of the disc, the reagents feed point of the disc, Number of reagents and the way of they entered to the reactor, seed rate and Ca(OH) 2 concentration, Atmospheric conditions. In this research project, consider how they effect for calcium carbonate Nano-particles.

Biological Hydrogen Production

Name : Kumbukage K.A.B.
Supervisor / Co-supervisor : Dr. A. Manipura

Biological hydrogen is an alternative method for producing hydrogen as it is cost effective and environmentally friendly process. This is done in dark fermentation by anaerobic bacteria or under light. These basic two methodologies of bio-hydrogen production are already experimented well. However, this research is aimed to get better production rate by combining the two basic methodologies in an optimal way for industrial scale bio hydrogen production.

Bio gas production from food waste for energy recovery

Name : Perera D.I.M.
Supervisor / Co-supervisor : Dr. C.S. Kalpage & Dr. A. Manipura

Nitrogen is a vital source for the flora as well as the fauna, for their growth and metabolism. Considering the necessity of nitrogen in agricultural industries, urea is the mostly applied fertilizer to fulfil the nitrogen requirement. But urea is produced under adverse conditions; under high pressure and high temperature. Moreover, there’s naturally occurring nitrogen fixation mechanism which catalyse by the nitrogen fixers; the microorganisms. The present study focused on the nitrogen fixation mechanism by the bacterium Azotobactor. Nitrogen fixation efficiency is defined as the amount of nitrogen fixed in a certain period of time. Results of the study shows that the rate of fixation depend on the facts that are related to bacterial growth conditions. The experiments are done by varying the pH of the culture medium and N2 fixation is measured with the bacterial state of growth by Acetylene reduction assay.

Synthesis of hydrocarbon fuels using waste plastics

Name : Ranasinghe R.M.W.C.B.
Supervisor / Co-supervisor : Dr. D.G.G.P. Karunarathna

The plastic consumption rapidly grew during the last few decades due to their ability to be simply formed, its light weight and non-corrosive behavior. These excellent properties of plastic lead to replace of wood and metals by plastics. Disposal of solid waste has become a major environmental issues in Sri Lanka. Land filling was not a suitable option for disposing plastic wastes because of their slow degradation rates. The incineration of plastic waste generates toxics such as dioxins. Therefore, recycling and recovering methods used to minimize the environmental impacts. Waste plastic pyrolysis and conversion in to fuel is one option. The aim of this project is to study fuel oil production from municipal plastic wastes by catalytic pyrolysis process.

Design a steam generating system to reduce heat loss from refinery flare

Name : Samarakoon M.G.C.B.
Supervisor / Co-supervisor : Dr. D.G.G.P. Karunarathna & Ms. Anoma Senevirathne

Steam assisted flare systems are commonly used in petroleum and petrochemical industries to supply required momentum and turbulence to the air and fuel mixture to maintain complete combustion as a result of that reduce the black smoke. Sapugaskanda oil refinery of Ceylon petroleum cooperation has only three water tube steam generating boilers and one is not working. So that steam load is not enough to carry out both electric generations by steam turbines and supply steam to the flare system simultaneously. So that the steam flows to the flare system was limited or cutoff frequently and the environmental issues due to incomplete combustion was neglected. The new design of steam generation system deals with radiation heat transfer from the flare which is usually wasted to the environment without any heat recovery method. So that it is convenient to use flame heat rather than establishing new boiler which is not economically feasible. The existing steam path carries steam all the way from plant to flare with higher amount of heat loss to the environment and the new system generates steam in same place and heat loss can be neglected. The new system contains water pump selection, steam generating coils design, separator drum to separate water vapor and steam, steam injecting nozzle design with measuring and control instrumentation. The economic feasibility analysis and safety analysis can be compared with existing system to check the feasibility of the new design.

Removal of heavy metal from waste water using algae

Name : Silva A.K.S.D.
Supervisor / Co-supervisor : Dr. A. Manipura

Water pollution by heavy metals is a serious environmental problem with rapid industrial development. Sources such as textile and tannery industries release these metals to environment and removal of these metals is very important to avoid the hazards associated with them. There are many methods to treat water containing heavy metals. But use of algae is an interesting approach. In this work, an alga, which is locally available, is used to remove two heavy metals from textile industrial wastewater. Here, two methods of alga cultivation are employed. In the first method, alga is grown with known concentrations of selected heavy metals and in the other, once the alga is grown, known concentration of the same metals is introduced to find out which method is effective in removing the heavy metals.

Industrial waste water treatment using photo-oxidation method

Name : Sirisena B.V.M.N.B.
Supervisor / Co-supervisor : Ms. W. Menike & Dr. C.S. Kalpage

Study is carried out to find applicability of Photo Fenton oxidation method for treating textile wastewater and to identify optimum treatment conditions: Ferrous ion concentration, Hydrogen Peroxide concentration, pH value and operating time for having maximum treatment efficiency of color removal and the COD reduction. In preliminary investigation 34% of color revels efficiency was obtained for treatment of a 0.2% methylene blue solution with operating condition of Ferrous ion concentration 80mg/l, Hydrogen Peroxide 200mg/l, pH of 3 and operating time of 1 hour. Detailed investigation will to be carried out according to the response surface methodology for finding optimum operating condition of Photo Fenton oxidation method to be maintained to have maximum treatment efficiency.

Natural fibers as substitutes for asbestos

Name : Wijerathne M.A.P.M.
Supervisor / Co-supervisor : Dr. D.G.G.P. Karunarathna

The exceptional chemical and physical properties of asbestos fibres have led to the development of the use of asbestos fibres in multiple forms of manufacturing numerous widely consumed industries, products and in the construction of building. Though it has a variety of applications asbestos has also been found to be a hazardous material to human health. Many countries, including all European, have banned the usage of asbestos while developing countries are finding substitutes for asbestos. According to WHO the most efficient way to eliminate asbestos related diseases is to stop using all types of asbestos. Several substitutes have been introduced to reduce the consumption of asbestos. Natural fibres are widely used as substitute materials for making roofing sheets at present. In this project, it is expected to manufacture roofing sheets with comparable mechanical properties by using coir fibres and to determine the material properties of coir corrugated sheets.

Investigation of most significant compound for pyro-plasticity of porcelain tiles though an experimental design

Name : Wijesooriya W.A.D.H.P.
Supervisor / Co-supervisor : Ms. W. Menike & Mr. Sumedha Medawala

Pyroplasticity is the tendency of the ceramics to deform under its own weight, during its firing process which affects to reduce the ceramic product quality. The properties of liquid phases formed during the firing process may affect on this deformation of porcelain ceramic products. The properties of the liquid phases formed during firing are varied mainly according to the raw material composition of feldspar, ball clay, silica sand and dolomite and the firing temperature maintained as per literature. Hence this research study Is conducted to find the main affecting factor for pyroplasticity among said factors and to find optimum combination of raw material composition and optimum temperature to be maintained for firing process to have minimum deformation percentage. Experimental design is done according the experimental mixture design procedure.

Design of a evaporation pan for improving the Jaggery making process from Palmyrah/Kithul treackle through efficient heat transfer

Name : Aberathne K.H.A.S.M.W.
Supervisor / Co-supervisor : Dr. M.A. Elangasinghe & Prof. R. Shanthini

The temperature distribution of the pan is an important parameter for consistency of the Jaggery and quality of the Jaggery. Composite evaporation pans improve the uniformity of temperature distribution on surface of the pan. The objectives of this project is to model the temperature distribution of surface of the evaporation pan subjected to a non-uniform heat source for optimizing the materials for composite pan and dimensions of the evaporation pan. The modelling exercise is carried out in COMSOL Multiphysics to observe the temperature distribution of the pan surface for different composites with different thicknesses and shapes of the pan for achieving uniform heat distribution in treacle during evaporation process.

Investigating the impact of water content and rotational speed upon quality of sesame oil produced using response surface methodology

Name :Abeysekara O.C.
Supervisor / Co-supervisor : Prof. R. Shanthini

Sesame oil contains oleic (up to 38.84%), linoleic (up to 46.26%), palmitic (up to 8.58%), steric (up to 5.44%). Oleic and linoleic have double bonds. That’s why sesame oil is unsaturated oil. Storage life (peroxide value and oxidative stability) of crude sesame oil significantly depends on the initial moisture content of sesame seed. High moisture content increases the peroxide value and reduces the oxidative stability, and therefore storage life is reduced. If sesame seeds has 12.7 % (wet basis) moisture, then it can be extracted maximum amount of oil. When the rotational speed is high in the screw expeller, yield of oil becomes low. Research hypotheses is sesame oil quality (peroxide value-PV, total phenolic content-TPC, 1,1-diphenyl-2-picrylhydrazyl –DPPH) and yield vary with seed moisture content and rotational speed. Overall aim is extracting oil with good quality and high yield. Specific objectives are extracting oil with seeds of different moisture contents (5 to 20% wb), extracting oil at different rotational speeds (30 to 50 rpm), determining the antioxidant activity ( TPC, DPPH )of sesame oil extracted, determining the yield of sesame oil extracted, and using response surface methodology to determine the relationship among quality parameters, yield, moisture content and rotational speed. Foin-Ciocalteau regent (FCR) volume, Na2CO3 concentration and time duration of optimum values were calculated using Minitab analyzing. There are 1.866 ml, 24.575% and 30 min.

Influence of heat on the quality of sesame oil

Name :Hewawasam A.T.M.
Supervisor / Co-supervisor : Prof. R. Shanthini

Sesame oil is a healthy food for human body due to its ability of prevention aging and increasing energy in human body. Though sesame oil contains more unsaturated fatty acids, it is a food which has high resistance to oxidation due to presence of phenolic antioxidant compounds. Recent studies have investigated that oil oxidation is a temperature and time dependent process. It is important to investigate the optimum heating temperature and heating time of sesame oil because sesame oil is basically used in cooking. Therefore aim of this project is to find out the temperature and heating time that sesame oil gives the optimum antioxidant activity. Best method for extracting phenolic compounds from sesame oil was obtained by carrying out total phenolic content (TPC) for different extraction methods. Four tests including TPC and peroxide value(PV), free fatty acids(FFA) and 2,20-diphenil- 1-picrhlhydrazyl (DPPH) will be carried out in future to find out antioxidant activity of sesame oil heated in different heating temperatures and times.

Use of paddy husk ash in production of garden tiles

Name : Chandrasiri L.C.M.
Supervisor / Co-supervisor : Dr. M. Danthurebandara

Rice husk ash (RHA) is a residue of burning of rice husks. As RHA has very effective pozzolanic properties they can be used as construction materials. In this study, RHA resulted from a boiler used in power generation has been evaluated for optimal level of replacement of sand and cement in garden tile production. Results obtained in the preliminary testing indicate that high carbon content in RHA could have adverse effect on the compressive strength of the specimens.

Removal of some basic dyes from artificial textile wastewater by adsorption on paddy husk charcoal

Name : Ilangarathna D.C.N.
Supervisor / Co-supervisor : Ms. S.M.W.T.P.K. Ariyaratne & Dr. M.A. Elangasinghe

All synthetic dyes in the effluents from textile industry activities can result many environmental hazardous to the aquatic system. Though there are several methods to treat such effluent, capital and the operational cost of them, limits the application. So, this is high time to search an advance treatment method like adsorption and low cost adsorbant. Paddy Husk Ash (PHA) is identified as freely available and hypothesised as a good adsorbant. Feasibility of using PHA is studied and the optimization of variables in adsorption is being studying at the moment.

Feasibility study of fluoride adsorption onto apatite powder/clay filter

Name : Manchanayake M.D.A.S.
Supervisor / Co-supervisor : Dr. M.A. Elangasinghe & Ms. N.I.K. Ekanayake

Excess fluoride in drinking water creates many problems to human health. Adsorption is most commonly used method for defluoridation. This study investigates feasibility of apatite or brick powder as fluoride adsorbents in a filter column. The fluoride removal efficiency of these powders as a function of pH level of the fluoride solution, contact time, initial fluoride concentration and apatite dosage are investigated. When the two powders are compared brick powder is found to be having high fluoride removal efficiency compared to apatite powder. Further studies are carried out in designing a filter column for home usage.

Design optimization of PET bottle through regression modelling & CAD simulations

Name : Perara L.T.S.
Supervisor / Co-supervisor : Dr. M.A. Elangasinghe & Mr. Ivan Dassanayake

The quality of a carbonated beverage essentially depend on the amount of carbon dioxide available in the beverage throughout its shelf-life. The fizziness caused by the presence of carbon dioxide gives a distinct taste as well as a sense to the particular beverage. Therefore, it is important that the fizziness is maintained throughout the shelf-life of the beverage. Hence, this study investigate whether the present design of Polyethylene terephthalate (PET) bottle, serves its purpose and, what modifications could be done in order to improve the design of the PET bottle. The bottle thickness at different zones of the bottle, as well as the pressure of carbon dioxide inside the bottle have been considered as model variables to be optimized using COMSOL Multiphysics software.

Manufacturing a geo-textile using fabric off-cuts

Name : Rathnasiri K.A.T.S.
Supervisor / Co-supervisor : Dr. M. Danthurebandara & Mr. Ranil Kularathna

With growing attention to environmental pollution due to improper solid waste management strategies, the textile l industry has expanded its efforts to reduce disposal of textile waste in landfills and also at the same time about finding alternative methods for the disposal of this textile waste. Hence considering the waste issue and textile industry demands, manufacturing a geotextile from fabric off cuts was considered in this study. Considering resource availability, non- woven methodology was considered for web forming and both thermal and chemical bonding methods were suggested as approachable bonding methods.

Micro algae farming in the wastewater as a treatment technology

Name : Sandaruwan B.L.P.
Supervisor / Co-supervisor : Dr. M. Danthurebandara

Generation of massive amounts of wastewater from industries and households is a big issue in the world. Treatment of wastewater before discharging them into inland surface waters is essential to minimize the related environmental problems. Current treatment methods needs higher costs and energy. Using microalgae in wastewater treatment is a promising low cost treatment technology which incurred more benefits compared to conventional treatment processes. Wastewater can be treated at low cost from one hand and the harvested microalgae can be used in various other applications such as production of biodiesel and biogas on the other.

Investigation of therapeutic properties of Aegle Marmelos (Beli)

Name : Weerasekara N.S.
Supervisor / Co-supervisor : Dr. M.A. Elangasinghe

Ayurvedic plants have healing powers against many common and powerful diseases. Anti-bacterial activity is one among them. Sri Lankan Aegle Marmelos (Beli) leaves were screened to find out their anti-bacterial property using two extraction methods, solvent extraction and steam distillation. Hexane, Methanol and Ethanol were used as solvents. When Hexane act as the solvent, the extracted oil amount was 3% from powdered leaves. Standard strains of Staphylococcus aureus (ACTT 25123), Pseudomonas aeruginosa (ACTT 10662) and Escherichia coli (ACTT 25922) were used to examine the anti-bacterial property in crude extracts, using Agar diffusion method. Highest antibacterial properties were shown for E.Coli as 2mm inhibition diameter. Minimum Inhibition Concentration (MIC) will be found for the bacteria that it shows highest antibacterial activity. A product (an anti-bacterial cream) will be developed using this minimum inhibition concentration.

Bio gas generation from yeast sludge at the distillery plant, Pelwatte

Name : Weerasingha W.M.P.P.
Supervisor / Co-supervisor : Ms. S.M.W.T.P.K. Ariyaratne

Recently, there has been an increasing interest in using anaerobic fermentation to produce bio gas as an alternative energy source. Commonly used substrate for biogas production includes industrial waste and agricultural waste. Three major wastes generates in the sugar industry were considered in this study. The objective of this research is to study the feasibility of biogas generation by spent wash discharge from the distillery plant at the sugar industry with , kitchen waste generate in the factory residences and filter mud from the same plant. The biochemical methane potential of distillery spent wash, distillery spent wash with filter mud and
distillery spent wash with kitchen waste were determined in laboratory scale.. In determination of bio methane concentration, the volumes of the gas were obtained using the liquid replacement method (LRM) and the compositions of the collected samples were analyzed using gas chromatography. Spent wash with filter mud was identified as the best combination for biogas generation. The optimized ratio of the combination will be investigated with ongoing experiments

Valorization of paddy husk ash through silica extraction

Name : Wijerathne A.M.L.C.K.
Supervisor / Co-supervisor : Ms. S.M.W.T.P.K. Ariyaratne & Dr. M. Danthurebandara

Paddy husk has been identified as a potential and sound source for power generation. But, the ash generation in paddy husk combustion is high comparing to other fuels. Therefore, Paddy Husk Ash (PHA) generates in the power plants is a considerable waste and has become an issue in dumping sites. Therefore a proper utilization of PHA through value addition is essential.

There are several identified applications in PHA and feasibility of silica extraction is studied in this study. Thermal and chemical methods are available in literature for silica extraction. Among them chemical methods consume low energy. They are environmental friendly and suitable for mass production of silica. Two methods available in literature were followed by using H2SO4 and CO2 for acidification under chemical methods and final precipitations of silica were obtained with yields of 5.7 g and 9.7 g per 10 grams of PHA respectively. The affecting factors for silica extraction have been identified with the literature and optimization of them will be studied next.

Use of spent earth in production of garden tiles

Name : Ranasinghe M.H.R.P.
Supervisor / Co-supervisor : Dr. M.Danthurebandara

Bleaching earth is an adsorbent used in edible oil refinery process. After using bleaching earth, the residues are called spent earth. The spent earth has no proper disposal method rather than landfilling which results severe environmental problems. In this study use of spent earth in production of garden tiles has been examined. Two experimental series have been suggested: use of spent earth as an alternative for (i) sand and (ii) cement. Measuring compressive strength and water absorption capacity is suggested to determine the quality of the produced garden tiles.

Modelling and Simulation of Sekku Performance Using Sesame as the Model Material and Experimental Verification

Name : Ranathunga R.M.K.S.C.
Supervisor / Co-supervisor : Prof. R Shanthini & Prof. K.S. Walgama

Oil extracted by means of traditional method; Sekku has comparatively greater demand than the oil extracted using other modern devices due the high quality and taste of Sekku extracted oil. But this methodology is not so efficient in terms of operating speed, capacity, etc. and this is a major drawback that experience by the Sekku owners. Moreover, it can affect the future of this traditional technology. Performance of current system should be understood through careful analyses so that new improvements can be suggested based on the shortcomings of the current system. The minimum power requirement can be identified as the power which is sufficient just to overcome the frictional resistance of the system. And, it can be calculated by solving the system of force acting on the different components of the Sekku which contribute in the grinding operation. Temperature of model material will increase during the operation and this temperature variation cannot really be investigated through a pure experimental approach. Thus, the best way to understand the temperature profile of the study material is application of a suitable graphical analysis approach.

Analysis of therapeutic components in Sri Lankan sesame oil

[Attempts will be made to extract the said components using column chromatography and to model the column.]

Name : Rathnayake R.M.M.S.B.
Supervisor / Co-supervisor : Prof. R. Shanthini & Ms. W. Menike

Study was carried out to compare the sesamin and sesamolin contents of white sesame seed oil. Preliminary experiments were carried out by analysing oil samples with high performance liquid chromatography (HPLC) and Spectrophotometric methods. In HPLC peaks were obtained at 290 nm. Absorbance of roasted oil samples and normal oil samples were measured between the range 200 nm to 400 nm in spectrophotometer. The roasted oil samples showed higher absorbance than normal oil samples around 290 nm. This could either represent higher percentage of sesamin and sesamolin or presence of another chemical components formed due to dissociation of sesamin and sesamolin. Further investigation is required in determining the identity of these components in roasted sesame oil.