Abstract
Near-critical solvents carbon dioxide, propane and dimethyl-ether were used to extract lipids from cold-pressed hemp seed meal, hulls, and hearts. Extraction of meal yielded a low-fat marc that was fractionated by particle size into high-protein and high-fibre fractions. Supercritical CO2 processing was optimised by milling and sieving the meal to concentrate the oil and protein in the feed stream prior to extraction. DME was the most thorough solvent, co-extracting more water than CO2 and propane, which removed none. DME and propane both extracted over 90% of the available tocopherols from the hemp seed hearts although neither were particularly effective at phospholipid extraction.
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