University of Moratuwa Research – Reports
Permanent URI for this communityhttp://192.248.9.226/handle/123/8848
Browse
Browsing University of Moratuwa Research – Reports by Author "Amarasinghe, ADUS"
Now showing 1 - 8 of 8
- Results Per Page
- Sort Options
- item: SRC-ReportEffect of karawila (MC43) seed oil on the film properties of alkyd resins prepaired from Soya oilAmarasinghe, ADUSBlending of fatty oils is commonly practiced in surface coating industry to obtain good performance levels of alkyd resins. Haseebuddin et al. [7] showed that better performance could be achieved when soya bean oil is blended with dehydrated castor oil. The presence of higher amount of unsaturation in karawila seed oil is expected to give better performance in long oil alkyd resins.
- item: SRC-ReportInvestigation of the preprocessing techniques and extraction parameters on the yield and the quality of the cinnamon bar oil.Amarasinghe, ADUSImmediate drying is the most important operation in post harvest processing for the plants which normally contain a high level of moisture and microorganisms, to avoid quality losses of these valuable, but perishable crops. The traditional practice of shade drying of cinnamon bark has negative effects on quality of the product. High ambient air temperature and relative humidity in Sri Lanka promote the insect and mould development in harvested crops. Furthermore, intensive solar radiation adversely affects to quality, causing vitamin and essential oil losses or colour changes in dried crops. This kind of problems can be overcome by adapting a hot air dryer as done for drying of many perishable products such as fruits and vegetables.
- item: SRC-Report
- item: SRC-ReportOptimization of the Operating Conditions and the Preprocessing Methods for Extracting Chlorophyll form Mukunuwenna(2016-08-11) Amarasinghe, ADUSChlorophyll is widely extracted; 'for industrial applications and is a key topic of sCien~fic and commercial interest. A. sessilis, which is known as mukunuwenna in Sri Lanka, is one of best selections for the extraction of chlorophyll due to the good extraction efficiency, availability and low cost. In this work, the optimum operating conditions for the extraction of chlorophyll from Alternanthera sessilis using solvent extraction were studied using buffered 80% aqueous acetone. The results revealed that the best solvent volume to A. sessilis weight ratio, which gives the highest yield of chlorophyll, was 5 ml/g. The effect of temperature and the extraction time on the extraction was also studied. The optimum temperature of extraction is 50°C and the optimum time of extraction is 45 minutes. The mass transfer of chlorophyll from A. sessilis at 20°C and 30°C was modelled mathematically, using general mass transfer equations. The experimental results showed that the degradation of chlorophyll beyond the temperature of 30°C is significant. The saturation solubility of chlorophyll a was 54.06 and 107.6Ilg/ml and that for chlorophyll b was 23.13 and 29.68 ug/mlat the temperatures of 20 and 30°C respectively. Pre-processing method and the storage conditions were studied as post harvest operations for A. sessilis. The optimum method of pre processing was identified as mechanical grinding. For one day storage, refrigerator conditions (15°C) were the optimum conditions; and for a longer storage time it was the ambient air conditions (indoor) . Sodium copper chlorophyllin has produced with a 33.3% conversion of chlorophyll and its derivatives, using a modified process. The kinetics of degradation of chlorophyll of the produced sodium copper chlorophyllin follows a first order relationship between the concentration and the time. The relationship between the rate constant and the temperature follows the Arrhenius behaviour. The activation energy for chlorophyll a and bare 3.014 and 2.78 kcal/mol respectively. The rate constants for chlorophyll a and b at different temperatures are also obtained.
- item: SRC-ReportStudy the Factors Influencing the Production of Ethanol from Waste Coconut Water(2016-08-16) Amarasinghe, ADUSCurrently in Sri Lanka, coconut water is a waste from Desiccated Coconut (DC) industry apart from the small quantity used to produce beverage and vinegar. BOD and COD value of coconut water were found to be 13,000-15,000 mg/l and 40,000 mg/l respectively while the effluent water contains 6000- 10,000 mg/l and 17,000-20,000 mg/l respectively [3]. A local DC factory processes around 30,000- 50,000 coconuts per day. It is mandatory to treat the effluent water in a waste water treatment plant in order to meet the water discharge standards. Value addition is obviously an important and worthwhile option for waste coconut water from the DC mills.
- item: SRC-ReportStudy the factors influencing the production of ethanol from waste coconut waterAmarasinghe, ADUSCurrently in Sri Lanka, coconut water is a waste from Desiccated Coconut (DC) industry apart from the small quantity used to produce beverage and vinegar. BOD and COD value of coconut found to be 13,000-15,000 mg/1 and 40,000 mg/1 respectively while the effluent water contains 6000-10.000 mg/1 and 17,000-20,000 mg/1 respectively [3]. A local DC factory processes around 30,000-50.000 coconuts per day. It is mandatory to treat the effluent water in a waste water treatment plant in order to meet the water discharge standards. Value addition is obviously an important and worthwhile option for waste coconut water from the DC mills.
- item: SRC-ReportUsing steam sterilization effectively and economically for Sri Lankan desiccated coconut industryAmarasinghe, ADUSThe unit operation blanching was introduced to the desiccated coconut production process to ensure the destruction of pathogenic bacteria. However, research has shown that even after introducing the blanching process, certain bacteria are able to survive. As a result, incorporation of DC into other food products without additional treatment can be of significant risk. Steam sterilization is a proven thermal processing method in food industry. Therefore it could be introduced into the DC production process in place of hot water blanching. Further, one of the main problems of the DC production process is the generation of large quantity of waste water due to discharge of coconut sap, blanching operations and equipment washing processes.
- item:Using Steam Sterilization Effectively and Economically for Sri Lankan Desiccated Coconut Industry(2016-08-16) Amarasinghe, ADUSThe unit operation blanching was introduced to the desiccated coconut production process to ensure I destruction of pathogenic bacteria. However, research has shown that even after introducing blanching process, certain bacteria are able to survive. As a result, incorporation of DC into other fo products without additional treatment can be of significant risk. Steam sterilization is a proven them processing method in food industry. Therefore it could be introduced into the DC production process place of hot water blanching. Further, one of the main problems of the DC production process is the generation of large quantity waste water due to discharge of coconut sap, blanching operations and equipment washing processes.