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Method for preparing water-soluble monascus yellow pigment

A technology for monascus yellow pigment and monascus red pigment, which is applied in the field of preparation of water-soluble monascus yellow pigment, can solve the problems of introducing harmful substances and high production costs, and achieves the effects of easy product, low price and mild reaction conditions

Inactive Publication Date: 2010-11-10
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of this water-soluble pigment, sodium borohydride is used as a reducing agent, the production cost is high, and harmful substances may be introduced

Method used

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  • Method for preparing water-soluble monascus yellow pigment
  • Method for preparing water-soluble monascus yellow pigment
  • Method for preparing water-soluble monascus yellow pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 1.0g of alcohol-soluble monascus red pigment powder, add 10ml of concentrated sulfuric acid, stir evenly, and react at 15°C under normal pressure for 4 hours. h, centrifuge, collect the precipitate, wash the precipitate with water to pH4~pH5, and then centrifuge to remove free water to obtain the precipitate; add 0.25g of sodium hydroxide to the precipitate for alkaline hydrolysis, the reaction temperature is 20°C, and the reaction time is 1h; After the alkaline hydrolysis, adjust the solution to pH4.0-pH6.0 with 1mol / L hydrochloric acid solution; concentrate, dry and pulverize, and the obtained dry powder is the prepared water-soluble monascus yellow pigment.

Embodiment 2

[0027] Weigh 1.0g of alcohol-soluble monascus red pigment powder, add 5ml of fuming sulfuric acid, stir evenly, and react under normal pressure at 25°C for 2 hours. After the reaction, add appropriate amount of water to the reaction solution, stir evenly, and let stand Centrifuge for 1h, collect the precipitate, wash the precipitate with water to pH4~pH5, and then centrifuge to remove free water to obtain the precipitate; add 0.30g of sodium carbonate to the precipitate for alkaline hydrolysis, the reaction temperature is 30°C, and the reaction time is 3h; alkali After the solution is finished, adjust the solution to pH 4.0-pH 6.0 with 2 mol / L citric acid solution; concentrate, dry and pulverize, and the obtained dry powder is the prepared water-soluble monascus yellow pigment.

Embodiment 3

[0029] Weigh 1.0g of alcohol-soluble monascus red pigment powder, add 10ml of chlorosulfonic acid, stir evenly, and react at 30°C under normal pressure for 0.5 hours. After the reaction, add an appropriate amount of water to the reaction solution, stir evenly, and let stand 2h, centrifuge, collect the precipitate, wash the precipitate with water to pH4~pH5, and then centrifuge to remove free water to obtain the precipitate; add 0.50g sodium bicarbonate to the precipitate for alkaline hydrolysis, the reaction temperature is 40°C, and the reaction time is 3h; After the alkaline hydrolysis, adjust the solution to pH 4.0-pH 6.0 with 2mol / L acetic acid solution; concentrate, dry and pulverize, and the obtained dry powder is the prepared water-soluble monascus yellow pigment.

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Abstract

The invention provides a method for preparing a water-soluble monascus yellow pigment. Alcohol-soluble monascus red pigment generated by monascus metabolism is used as a raw material. The method comprises the following steps of: carrying out sulfonation reaction; and centrifuging or filtering, precipitating and washing, carrying out alkaline hydrolysis, neutralizing, drying and crushing to prepare the water-soluble monascus yellow pigment. Compared with the conventional method, the method for preparing the water-soluble yellow pigment has the advantages of readily available reaction raw materials, low price, simple process, easy separation of products, mild reaction conditions, recycling use of excess sulfuric acid and environmental protection.

Description

technical field [0001] The invention relates to a preparation method of water-soluble monascus yellow pigment. Background technique [0002] Monascus pigment is a metabolite obtained from food as raw material through the cultivation process of Monascus. The basic raw materials are sufficient to meet the needs of large-scale production. [0003] The well-known monascus pigment is a kind of alcohol-soluble pigment, and its main components are erythematin and monascus rubin, and its molecular structure is: [0004] [0005] Among them, erythematin: R=C 7 h 15 , Monascus rubin: R=C 5 h 11 . The ingredient is red in color and hardly soluble in water. [0006] Japanese patent (7344880) discloses a patent application for a water-soluble monascus pigment, which uses the interaction of monascus rubin and erythematin with water-soluble proteins, polypeptides and amino acids to form a water-dispersible complex. The preparation process is complicated. There is a possibility o...

Claims

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Application Information

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IPC IPC(8): C09B61/00
Inventor 甘纯玑陈启鸣谢苗
Owner FUJIAN AGRI & FORESTRY UNIV
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