Extraction And Characterization Of Moringa Oleifera Kernel Oil And Encapsulation By Coaxial Electrospinning

Moringa oleifera (Mo) belong to the family Moringaceae with 14species, originated from South America, Africa and Indian Subcontinent. The kernel can be used for oil production, medicine, food supplement and water purification. In this study, four different types of extraction methods; namely cold pressing (CP), enzyme assisted cold pressing (EACP), enzyme assisted aqueous extraction (EAAE) and solvent extraction (SE) were used to produce oil from Mo kernel. The oil yield and oil recovery obtained were 8% and 23% for CP, 12% and 36% for EACP, 23% and 70% for EAAE and 23% and 99% for SE, respectively. The influence of different extraction methods on the microstructure of Mo kernel and flake were investigated. The physicochemical properties, antioxidant properties, oxidative activities and storage stability of the extracted oil were assessed. The fatty acid profile of the extracted oil was analysed using Gas Chromatography Mass Spectroscopy (GCMS), which reveal the monounsaturated fatty acid (MUFA) content range from 69 to 80%. Oleic acid found to be dominant in the Mo kernel oil, indicating its high stability towards oxidation. Thermal analysis of oil was also investigated using Differential Scanning Calorimetry (DSC). The result shows that different extraction method has significant effect on melting behaviour of Mo kernel oil. Based on the physicochemical properties, oxidative stability and fatty acid composition, CP oil was selected to be analyzed further by testing for its antioxidant properties and the effect of thermal degradation towards tocopherol content using High Performance Liquid Chromatography (HPLC)

Experimental investigation on evacuated tube solar collector using biofluid as heat transfer fluid

Bio-oil extracted from waste of different plant kernel was used as heat transfer fluid in evacuated tube solar collector. Thermal performance of the biofluids to the enhancement of the evacuated tube solar collector under varying weather conditions and experimental analysis was carried-out. Thermal analysis on the storage water tank temperature, outlet and inlet heat transfer fluid temperature, and heat gains by was studied. In addition, the biofluids thermophysical properties and degradation analysis was conducted and compared with conventional base-fluids. From the results the biofluids caused enhancement of heat gain in the collector receiver by 9.5%, 6.4% and 3.2% for moringa oleifera kernel oil (MOKO), date kernel oil (DKO) and palm kernel oil (PKO), respectively. The storage water tank temperature at night fall was 53, 49, 51 and 47oC, for the MOKO, DKO, PKO and water HTFs, respectively. The biofluids were thermal stable and with no degradation. The biofluids demonstrated potentials as heat transfer fluids in thermal applications but there are needs for more investigations on their enhancement with organically synthesized nano particles to preserve there no corrosive and toxicity nature, and experimental performance on heat exchangers after several heating cycles