Method for synthesizing monascus yellow pigment through direct electroreduction of monascus red pigment
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A technology of monascus red pigment and monascus yellow pigment, applied in the field of direct electroreduction of monascus red pigment to synthesize monascus yellow pigment, achieving obvious economic benefits and application prospects, low production cost and stable properties
Active Publication Date: 2013-05-01
厦门金色田园生物科技有限公司
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The second is: Chen Wenjian and others use tungstate / pertungstate cathodic indirect electro-oxidation method to synthesize yellow pigment. Both methods have fatal defects: Professor Su uses the reducing agent sodium dithionite, which is a toxic substance and is harmful to eyes, The mucous membrane of the respiratory tract is irritating; while Chen Wenjian added acetone to the reaction system, and the yellow pigment obtained by indirect oxidation is unstable and easy to decompose under light or heating conditions
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Embodiment 1
[0020] (1) Preparation of red pigment solution: Dissolve Monascus red pigment with a small amount of ethanol, add distilled water to make 10% red pigment solution 10L, add a certain amount of NaCl to make the NaCl concentration 0.1mol / L.
[0021] (2) Assembly of the electrolytic cell: the electrolytic cell adopts a diaphragm electrolytic cell, and the anode and cathode chambers are separated by Nafion117 cationic membrane (DuPont, USA) in the middle, and the solution in the anode chamber is 1mol / L Na 2 SO 4 , the cathode chamber is the above-mentioned monascus pigment solution, the cathode chamber is equipped with a stirrer, the stirring speed is 1000r / min, graphite electrodes are used for the cathode and anode, and a DC power supply is used.
[0022] (3) Electrocatalytic reduction process: use constant current method for electrolysis, the current is 10-50mA, pay attention to control the current during the reduction process to prevent the generation of hydrogen, and react unti...
Embodiment 2
[0026] (1) Preparation of red pigment solution: Dissolve Monascus red pigment with a small amount of ethanol, add distilled water to prepare 10L of 30% red pigment solution, add a certain amount of NaCl to make the NaCl concentration 1mol / L.
[0027] (2) Assembly of the electrolytic cell: the electrolytic cell adopts a diaphragm electrolytic cell, and the cathode and anode chambers are separated by a bipolar membrane in the middle. The solution of the anode chamber is 1mol / L NaCl, the cathode chamber is the above-mentioned monascus pigment solution, and the cathode chamber is equipped with stirring The stirring speed is 1000r / min, the cathode adopts copper electrode, the anode adopts stainless steel electrode, DC power supply.
[0028] (3) Electrocatalytic reduction process: Electrolysis is carried out in a constant current mode with a current of 10-50mA. During the reduction process, attention should be paid to controlling the current to prevent the generation of hydrogen, and...
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Abstract
The invention relates to a monascus yellow pigment preparation method, in particular to a method for synthesizing a monascus yellow pigment through direct electroreduction of a monascus red pigment. In the method, the monascus red pigment is taken as a raw material, an organic electrosynthesis method is used according to the following steps: dissolving the monascus red pigment in a small amount of ethanol, then adding distilled water and electrolyte to the monascus red pigment solution; preparing an electrolyte solution as an anode liquor; by taking an diaphragm electrolytic cell as an electrolytic bath and using a constant current method, evaporating anode electrolysate in a rotating way so as to remove the ethanol; separating out monascus yellow pigment precipitates; filtering the monascus yellow pigment precipitates so as to remove the electrolytes; and drying the filtered monascus yellow pigment precipitates so as to obtain the monascus yellow pigment. According to the invention, by using an electrochemical method, the monascus yellow pigment is directly modified to obtain the monascus yellow pigment; toxic substances are not used in the modifying process, the modifying process is safe and environment friendly, and the property of the obtained yellow pigment is stable; and moreover, the method for synthesizing the monascus yellow pigment through direct electroreduction of the monascus red pigment has the advantages of low production cost, simplicity and convenience in operation, obvious economic benefits and obvious application prospects.
Description
technical field [0001] The invention relates to a preparation method of monascus yellow pigment, in particular to a method for synthesizing monascus yellow pigment by direct electrical reduction of monascus red pigment. Background technique [0002] Monascus pigment (Monascus pigment) is a secondary metabolite secreted during the growth and metabolism of Monascus fungus. It has the characteristics of good stability and excellent protein coloration, and is non-toxic and teratogenic, with high safety and antibacterial properties. , regulate blood lipids, prevent arteriosclerosis and other biological activities, therefore, Monascus pigment is favored in the food production market. From the perspective of chemical composition, monascus pigment mainly contains two red pigments, erythromycin and monascus red pigment, and two yellow pigments, monascus and monascus xanthin. At present, its red pigment is mainly used as a colorant in food production. , its yellow component is not ...
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