Method for preparing high colour value red rice pigment using rice as raw material

Abstract

A method for manufacturing monascus pigment with a high color value by taking rice as a material includes the following steps: (1) preparing rice pulp; (2) adding 0.2 to 0.25 percent of sodium nitrate, 0.15 to 0.25 percent of monopotassium phosphate, 0.15 to 0.25 percent of heptahydrate magnesium sulfate, 1 to 1.5 percent of corn pulp and 1.5 to 2 percent of bean powder calculated by the weight of the rice pulp into the rice pulp, heating to 121 DEG C and maintaining for 20 minutes and cooling to 35 DEG C to 40 DEG C below zero to prepare a fermentation culture medium; (3) after the monascus pigment is cultured by a solid incline, inoculating the monascus pigment into a seed culture medium and culturing for 50 hours to prepare the enlarging culture medium of a monascus strain ; (4) adding the enlarging nutrient liquid, the quantity of which is equal to 8 to 10 percent of the weight of the monascus strain, into the fermentation culture medium, stirring and culturing for 85 to 100 hours and maintaining the pressure of a fermentation pot to be 0.04 to 0.06MPa to prepare a fermentation liquid; (5) filtering the fermentation liquid, obtaining a condensed liquid after membrane condensing is carried out on a filter liquid, then drying in a spraying or freezing way, namely obtaining the monascus pigment. Detected by a detecting method regulated by the national standard of GB15961-2005, the color value of the monascus pigment prepared by the invention can achieve more than 200.

Description

technical field [0001] The invention relates to a preparation method of high-color-valence monascus pigment, in particular to a method for preparing monascus pigment by using rice as a raw material through microbial liquid fermentation technology. Background technique [0002] Red yeast rice is a traditional Chinese medicinal and edible rice fermented product, which has a history of more than 1,000 years in my country. It is made by solid-state culture and fermentation in rice with the unique Chinese monascus fungus, and it is dried and ground. Because it contains red pigment, it is dark red, so it is called red yeast rice. It used to be a health food for ancient emperors, and there was a record of "cooking meat with red yeast rice" in the Sui and Tang Dynasties. More than 600 years ago, Li Shizhen, an ancient Chinese pharmacist, included red yeast rice in the "Compendium of Materia Medica" for the first time, and accurately explained the medicinal functions of red yeast ri...

AI Technical Summary

Problems solved by technology

[0004] At present, there are two main methods of producing red yeast pigment: one is the solid-state fermentation extraction method, in which Monascus is inoculated into cooked rice, fermented by solid-state culture, dried and ground, and then extracted with alcohol It is obtained by extracting the pigment from it with organic solvents and drying it. The biggest advantage of the solid-state fermentation method for preparing red yeast pigment is that it requires less investment, but the biggest disadvantage is that it is labor-intensive. And add water, inoculate Monascus strains through liquid fermentation, then filter, concentrate and dry. Its advantage is high degree of automation, and its disadvantage is that the one-time investment is relatively large

And the existing preparation method, no matter it is the solid-state fermentation extraction method, or the liquid state fermentation extraction method, the red yeast pigment prepared by it, the color value is all lower