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An integrated novel approach was investigated for converting lipid-rich,wet/dry algae(Nannochloropsis Salina)into fatty acid ethyl esters(FAEE)under microwave-mediated supercritical ethanol conditions with a non-catalytic transesterification approach.This process enables simultaneous extraction of lipids from algal biomass and convert/transesterify them into algal biodiesel in a shorter reaction of time and may reduce the energy consumption due to simplified separation and purification steps.High conversion rates can be possible when the extractive-transesterification of algal biomass was performed near-critical or supercritical conditions.Experimental runs were designed to optimize the process parameters such as algae to ethanol ratio,reaction time and co-solvent(hexane)to biomass ratio to evaluate the effect on the algal biodiesel under controlled microwave power conditions.It was found that cosolvent play a vital role in reducing the severity of critical operational parameters and maximize the biodiesel yield.The algal biomass and lipid extracted algae(LEA)were characterized using FT-IR,TGA,SEM-EDS and TEM methods,whereas algal biodiesel samples were analyzed with GC-MS and FT-ICR MS analysis.It was demonstrated in this work that this direct conversion technique has the potential to provide an energy efficient and economical route for algal biodiesel production.