NOVELTY - Extracting lipid containing products from microalgal biomass, involves treating an aqueous mixture comprising microalgal biomass with microwave radiation and recovering lipid containing products from the treated microalgal biomass.    USE - For extracting lipid containing products, carbohydrate containing products, and protein containing products (claimed), preferably neutral lipid, triacylglycerol (TAG) for bio-diesel; polyunsaturated fatty acids such as omega-3-fatty acids used as nutraceuticals; the membrane lipids used as bio-surfactants, and bio-lubricants.    ADVANTAGE - The method provides economically viable production of oil from microalgae; exposes wet microalgal biomass to microwave radiation that leads to the release of oil products which can be recovered without the need for an intermediate drying step; and uses microwave radiation that reduces time taken for the step.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) extracting lipid containing products and carbohydrate containing products from microalgal biomass, involving providing an aqueous mixture containing the microalgal biomass; adjusting the pH of the aqueous mixture to pH of less than 7; heating the aqueous mixture containing the microalgal biomass; and separating the lipid containing products and the carbohydrate containing products from the biomass;    (2) extracting lipid containing products and protein containing products from microalgal biomass, involving providing an aqueous mixture containing the microalgal biomass; adjusting the pH of the aqueous mixture to pH of greater than 7; heating the aqueous mixture containing the microalgal biomass; and separating the lipid containing products and the protein containing products from the biomass; and    (3) extracting lipid containing products, carbohydrate containing products, and protein containing products from microalgal biomass, involving i) providing an initial aqueous mixture containing the microalgal biomass; ii) adjusting the pH of the initial aqueous mixture to pH of less than 7; iii) heating the acidic initial aqueous mixture containing the microalgal biomass to provide a first treated mixture; iv) separating the solid and the liquid from the first treated mixture to provide a first solid and a carbohydrate containing liquid; v) combining the first solid with an aqueous mixture to form a second aqueous mixture containing microalgal biomass; vi) adjusting the pH of the second aqueous mixture to pH of greater than 7; vii) heating the alkaline second aqueous mixture containing the microalgal biomass to provide a second treated mixture; viii) separating the solid and the liquid from the second treated mixture to provide a second solid and a protein containing liquid; ix) optionally, repeating steps (v) to (viii) using the second solid to provide a third solid and a further protein containing liquid; x) combining the second solid or the third solid with an aqueous mixture to form a final aqueous mixture; xi) treating the final aqueous mixture with a solvent; and xii) separating the solvent from the final aqueous mixture to provide a solvent containing lipid product.