The invention provides a technological method for producing
monascus red
pigment by adoption of the
whole membrane technology. The method comprises the following steps: a
monascus strain is inoculated into the prior
fermentation medium for liquid
submerged fermentation; an
ultrafiltration membrane or a micro-
filtration membrane is used for filtering a
fermentation broth most of which is removed, and then
ethanol or hot water or another
solvent is added into concentrated solution for leaching; an
ultrafiltration membrane or a micro-
filtration membrane is used for filtering a leaching liquor, and clarifying solution is obtained; a nano-
filtration membrane is used for concentrating and removing partial water and
ethanol or water; as for
alcohol extraction of the
monascus red
pigment, concentrated feed is distilled and a small amount of
ethanol is removed, and then finished products are obtained after mixture and
spray drying of the concentrated feed; and as for
water extraction of the monascus red
pigment, the finished products are obtained after mixture and
spray drying of the concentrated feed. The method selects the ultrafiltraiton membranes or the micro-filtration membranes with different filtration precisions to process the
fermentation broth and the leaching liquor and uses the nano-
filtration membrane to concentrate the clarifying solution instead of using plates and frames for filtration,
dose not require adjusting the
isoelectric point, eliminates the influence of chemical medicines, improves the product yield and the quality and the color value of the finished products, and has low
energy consumption, low cost, high benefit and high application value.