Ultrafiltration membrane: extraction of natural pigments, antioxidants, etc

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As an efficient means of separation, ultrafiltration membrane technology has shown unique advantages in the field of extraction of natural pigments and antioxidants, providing green and sustainable extraction solutions for food, medicine, cosmetics and other industries. This paper will focus on the application principle, advantages and practical application cases of ultrafiltration membrane in the extraction process of natural pigments and antioxidants.

Application principle of ultrafiltration membrane technology in extraction process

The application principle of ultrafiltration membrane technology in the extraction process

Ultrafiltration membrane is a kind of separation membrane with a pore size between microfiltration and nanofiltration, and its pore size is generally between 0.001-0.1 microns, which can effectively retain large molecular substances, such as proteins, polysaccharides, colloids, etc., while allowing small molecular substances such as water, monosaccharides, inorganic salts, etc., to pass freely. In the extraction process of natural pigments and antioxidants, ultrafiltration membrane technology is mainly based on the following principles:

Separation and purification: The ultrafiltration membrane can accurately separate the target pigment or antioxidant from other impurities in the solution, such as protein, fiber, pectin, etc., through its unique micropore structure, so as to achieve the purification of the target substance.

Concentration and recovery: Using the retention characteristics of ultrafiltration membrane, the solution containing the target substance is passed through the membrane component, so that the target substance is trapped on the surface of the membrane or in the membrane hole, and water and other small molecular substances are discharged through the membrane, so as to achieve the concentration and recovery of the target substance.

Low temperature and mild operation: The ultrafiltration membrane separation process does not require heating or adding chemical reagents, only relying on pressure drive, can be carried out at low temperatures and relatively mild conditions, effectively protecting the biological activity and chemical stability of natural pigments and antioxidants.

Second, the advantages of ultrafiltration membrane technology in the extraction process

High efficiency and high selectivity: ultrafiltration membrane has high separation efficiency and selectivity, and can effectively separate the target substance and impurities in a short time, while the loss of the target substance is small, and the extraction yield is high.

Energy saving and environmental protection: The ultrafiltration membrane separation process does not require high temperature, high pressure or chemical reagents, low energy consumption, little impact on the environment, in line with the concept of green extraction.

Simple operation and scalability: The ultrafiltration membrane equipment has a simple structure, easy to automate the operation, and the membrane components are easy to modular design, easy to scale up, and adapt to the needs of industrial production.

3. Practical application cases

Natural pigment extraction: Taking monascus pigment as an example, through ultrafiltration membrane technology, monascus pigment can be efficiently separated and purified from monascus fermentation liquid, while removing impurities such as protein and polysaccharide, and obtaining monascus pigment products with bright color and high purity. Compared with the traditional precipitation method and extraction method, ultrafiltration membrane technology significantly improves the extraction efficiency, reduces the use of chemical reagents, and reduces environmental pollution.

Antioxidant extraction: Taking tea catechins as an example, ultrafiltration membrane technology can effectively separate catechins from tea polyphenols, caffeine and other components in tea extract to achieve high-purity extraction of catechins. In addition, by adjusting the membrane pore size and operating conditions, the selective separation of catechin components with different molecular weights can also be achieved to meet the needs of different application fields for catechin product characteristics.

Iv. Conclusion

Ultrafiltration membrane technology, with its unique separation principle, significant advantages and successful application cases, has become the ideal choice in the field of natural pigment and antioxidant extraction. Its efficient, environmentally friendly and mild operation characteristics not only help to improve the extraction efficiency and protect the activity of the target substance, but also promote the development of related industries in a green and sustainable direction. With the continuous progress of membrane materials and membrane technology, the application prospect of ultrafiltration membrane technology in the field of extraction of natural pigments and antioxidants will be more broad.

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