NOVELTY - Extraction of mixed sugars from lignocellulosic feedstock involves adding water to the feedstock to produce a mixture, heating the mixture under pressure to an extraction temperature of 130-180 degrees C and retention time of 30 minutes to 8 hours, in which the water combined with the feedstock comprising a liquid fraction and solids fraction, is kept in a liquid state during the retention time, and separating the liquid fraction from the solids fraction to produce a liquid stream comprising mixture of solubilized fructose, glucose, xylo-oligosaccharide and xylose, and solid stream.    USE - Extraction of mixed sugars (claimed). Uses include but are not limited to production of ethanol, feedstocks for producing other biofuels such as butanol or hydrocarbons, feed of systems used for producing algae from heterotrophic organisms, as carbon source for production of other biochemicals, bioproducts and pharmaceuticals.    ADVANTAGE - The method enables economical extraction of mixed sugar with high efficiency, minimizing degradation of sugars and formation of inhibitory compounds, and with co-extraction of soluble bioactive compounds and low-molecular weight extractives and polyphenols. The mixed sugars are fermentable, with no adverse effects on yield or rate of ethanol production.    DETAILED DESCRIPTION - Extraction of mixed sugars from lignocellulosic feedstock involves adding water to the feedstock to produce a mixture, heating the mixture under pressure to an extraction temperature of 130-180 degrees C and retention time of 30 minutes to 8 hours, in which the water combined with the feedstock comprising a liquid fraction and solids fraction, is kept in a liquid state during the retention time, and separating the liquid fraction from the solids fraction to produce a liquid stream comprising mixture of solubilized fructose, glucose, xylo-oligosaccharide and xylose, and solid stream comprising cellulose and lignin. INDEPENDENT CLAIMS are included for the following:    (1) component of the liquid stream; and    (2) component of the solid stream.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of production of sugars and bio-products from sucrose-rich feedstocks.