TECHNOLOGY FOCUS - BIOLOGY - Preferred Component: The enzyme is a lipase, an esterase or whole cells. Preferred Material: The lipase is Candida antarctica, Candida cylindracea, Pseudomonas cepacia, Mucor miehei, Mucor javanicus, Aspergillus niger, Swine pancreas, A. subtilis, A. orayze, Rhyzopus oryzae, or Chromobacterium visocosum.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The salt is metal halide, metal sulfate and/or metal nitrate. The salt can be alkali metal halide, alkali metal sulfate, alkali metal nitrate, alkali metal carbonate, alkali metal phosphate, alkali metal carboxylate, alkaline metal halide, alkaline metal sulfate, and/or alkaline metal nitrate. The salt can be a group of formula NaX, MgX2, KX, LiX, K2X2, CsX, and/or RbX.X=halide, nitrate or acetate.Preferred Material: The salt is sodium chloride, potassium carbonate, sodium nitrate, magnesium nitrate, sodium bromide, magnesium chloride, potassium chloride, lithium chloride, cesium chloride, cesium carbonate, potassium acetate, and/or sodium acetate. The salt can be sodium sulfate, potassium carbonate, magnesium sulfate, cesium sulfate, sodium phosphate, potassium phosphate, sodium bisulfate, potassium bisulfate, magnesium sulfate, cesium bisulfate, sodium biphosphate, potassium biphosphate, sodium hydrogen phosphate or potassium hydrogen phosphate.    TECHNOLOGY FOCUS - METALLURGY - Preferred Component: The metal can be groups I-V metals or groups 3-12 metals.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method further comprises separating the biodiesel from the reaction mixture. The reaction mixture is heated to 30-85 (preferably 30-60) degreesC. Preferred Component: The alcohol is lower alkanol, preferably methanol, ethanol, propanol, and/or butanol. The solvent is water, ionic liquid or polar solvent immiscible with oils or fats. Preferred Material: The feedstock is animal fats, sunflower seed oil, soya bean oil, palm oil, coconut oil, linseed oil, rapeseed oil, corn oil, cottonseed oil, groundnut oil, canola oil, olive oil, castor oil, jatropha oil or waste edible oils. Preferred Composition: The alcohol and the feedstock have a molar ratio of 1:3-5:1 (preferably 3:1). The palm oil and the enzyme have a weight ratio of 10:1-80:1. EXAMPLE - An appropriate amount of methanol dissolved in a salt (magnesium chloride) saturated water solution (2:1, v/v) based on a stoichiometric ratio of methanol to palm oil (3:1) was added to 10 g palm oil and mixed at 180 rpm and 40degreesC. The reaction was initiated by adding 0.4 g Novozym 435(RTM: immobilized Candida antarctica lipase) to yield a biodiesel after 30 hours.