Composite medium for producing functional red yeast rice and its preparation method and fermentation method

Abstract

The invention discloses a complex medium for producing functional red yeast rice and a preparation method and fermentation method thereof. The complex medium is prepared by granulating powder and nutrient solution, wherein the powder comprises the following raw materials in percentage by weight: 24-38% of long-shaped rice powder, 42-55% of oat powder and 7-34% of soybean meal; the nutrient solution is prepared from water and the following raw materials: 38-76g / L sucrose, 5-12g / L yeast powder, 5-12g / L ox bone peptone, 1-5g / L compound amino acid, 2-5g / L magnesium sulfate, 1-5g / L sodium nitrate and an acidity regulator for regulating the pH value of the nutrient solution to 3.5-4.5; the weight ratio of the powder to the nutrient solution is 1:(0.2-0.6). The complex medium with nutritional ingredients and material characteristics better conforming to monascus fermentation is prepared by optimizing the ratio of raw materials; the looseness, air permeability and mass and heat transfer effect of the medium are improved through raw material granulation, and the complex medium adapts to the growth of monascus strains and the metabolism of monacolin K, thus the fermentation effect and product quality of the functional red yeast rice are effectively improved.

Description

technical field [0001] The invention belongs to the field of microbial solid-state fermentation, in particular to a compound medium for producing functional red yeast rice and a preparation method and fermentation method thereof. Background technique [0002] Red yeast rice, known as Danqu in ancient times, has been used in my country for more than one thousand years. It is a fermented product with the same source of medicine and food. With the discovery of Monacolin K, a metabolite of Monascus, more and more people pay attention to the fermented products of Monascus. [0003] Functional red yeast rice has the effect of lowering blood lipids. It is produced by inoculating Monascus mold on grain medium through solid-state fermentation, and the monacrine K content is greater than 4mg / g. Monascus fermented product. In addition to Mona Jungle K, functional red yeast rice also contains a variety of biologically active ingredients such as ergosterol, γ-aminobutyric acid, and natu...

AI Technical Summary

Problems solved by technology

[0005] Functional red yeast rice is traditionally fermented and cultivated using rice as a substrate, and oats, barley, and yam are also used as substrates for cultivation. However, the nutritional content of a single granular substrate is not completely suitable for the growth and development of red yeast rice. The metabolism of Monacolin K, and the powdery material is likely to cause the solid medium to agglomerate during the fermentation process, which is not conducive to heat dissipation, ventilation, and mass transfer and heat transfer, resulting in the existence of some raw materials after fermentation. Lin K's metabolism is slow and the content of the product is low

According to current research reports, the maximum content does not exceed 25mg / g, which restricts the development of functional red yeast rice industry