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Keratinic acid (Sephadex G-25), also known as dextran gel G-25, CAS 9041-35-4, The molecular formula is C9H20O9, which is a gel made by crosslinking dextran, with a three-dimensional porous network structure. Usually presented as white beads or powder. This form makes it easy to handle and apply in laboratory and industrial environments. The product name is Sephadex, which is a commonly used stationary phase for volume exclusion chromatography. It is a hydrophilic gel and easy to swell in water. This property gives it excellent performance in the process of separating aqueous solutions. The main use is for the separation of aqueous solutions of sugars, polysaccharides, amino sugars, peptides, proteins, enzymes, as well as for the separation of higher molecular weight and water-insoluble substances.
The crosslinking degree of cheese acid is a key factor affecting the pore size of its network structure. The degree of cross-linking is usually expressed in terms of water absorption, and product models are often represented by a number that is 10 times the water absorption. Cheese acids with high water absorption and low cross-linking have larger pore sizes, making them suitable for separating substances with higher molecular weights; Cheese acids with low water absorption and high cross-linking have smaller pore sizes, making them suitable for separating substances with smaller molecular weights.
Application of Physical Properties
The physical properties of cheese acid make it widely used in multiple fields. Here are some specific application examples:
Volume exclusion chromatography:
Cheese acid, as a commonly used stationary phase in volume exclusion chromatography, has excellent separation performance. Its three-dimensional porous network structure enables effective separation of substances with different molecular weights. This application is widely used in fields such as biochemistry, molecular biology, and drug development.
Separation of aqueous solution:
Cheese acid has a wide range of applications in aqueous solution separation. Because of its hydrophilic gel properties, it can efficiently separate water-soluble substances such as sugars, polysaccharides, amino sugars, peptides, proteins, enzymes, etc. This application is of great significance for improving product quality and purity.
Desalination and buffer exchange:
By utilizing the molecular sieve action of cheese acid, buffer exchange and desalination operations can be carried out. This is of great significance for removing small molecule impurities and salts from the sample, which helps to improve the accuracy and reliability of subsequent experiments.
Purification and preparation of drugs:
Cheese acid is often used for drug purification and preparation in the process of drug development and production. By utilizing its separation performance, impurities and by-products in drugs can be effectively removed, improving the purity and quality of drugs.
Preparation of Nutritional Supplement Composition:
Cheese acid is also used to prepare nutritional supplements. For example, in the preparation process of certain traditional Chinese medicine extracts, caseic acid can be used for column separation to collect components with molecular weights greater than a specific value. This application helps to improve the purity and nutritional value of traditional Chinese medicine extracts.
Cheese acid, also known as Sephadex G-25, is a kind of gel cross-linked by dextran, which has a three-dimensional porous network structure. The cross-linking degree of this gel affects the size of its network structure pores, and its water absorption is large and cross-linking is small, so it has many applications.
Applications in Biochemistry and Molecular Biology
(1) Separation of aqueous solution
Separation of sugars, polysaccharides, amino sugars, peptides, proteins, and enzymes: Cheese acid is commonly used for aqueous separation of these biomolecules due to its unique molecular sieving effect. Its porous structure allows molecules of different sizes to be effectively separated based on their size.
(2) Drug purification
Purification of recombinant human interleukin-11 (rhIL-11): The fusion protein was desalinated using a cheese acid desalination column, followed by cation exchange chromatography to obtain a high-purity protein sample. This method is suitable for large-scale production, easy to operate, and has high product purity.
Preparation of Anticoagulant Peptides from Double toothed Sand Silkworm: During the preparation process, cheese acid chromatography is used to further purify the anticoagulant peptides, ultimately obtaining products with high purity and good anticoagulant activity.
(3) Antibody purification
Purification of ascites type antibodies: The purification of antibodies can be significantly improved by desalination using a cheese acid desalination column, combined with phosphate buffer equilibrium and elution, and the use of a Protein-A/G affinity column, resulting in antibody purity greater than 90%.
(4) Preparation of peptides and nanoparticles
Preparation of Chlorella Peptide Chitosan Nanoparticles: After extracting Chlorella protein, the Chlorella peptide chitosan nanoparticles were prepared by papain hydrolysis, ultrafiltration, ion exchange chromatography, and cheese acid column separation and purification.
(5) Isolation and purification of bee venom peptides
Through a series of steps including soaking crude bee venom with water, ethanol precipitation, extraction with ammonium hydroxide and n-butanol, acetone precipitation, ion exchange column elution, and cheese acid column gradient elution, electrophoretic grade bee venom peptides are finally obtained. This method simplifies the process and improves the yield and purity of bee venom peptides.
Extraction of Traditional Chinese Medicine and Natural Products
(1) Customized research and production of traditional Chinese medicine extracts
Cheese acid can be used for efficient separation and purification production of traditional Chinese medicine extracts, such as extracting effective ingredients from Chinese medicines such as chicken blood vine and Codonopsis pilosula, and separating components with molecular weights greater than 1000 through cheese acid columns.
(2) Production of raw materials and intermediates for natural products
In the synthesis or semi synthesis process of natural products, caseic acid can be used in the purification step to ensure the quality and purity of the final product.
Application in the food industry
Although the direct application of caseic acid in the food industry is not as extensive as in the field of biochemistry, as a polysaccharide derivative, pectin (the main component of caseic acid) has certain potential for application in the food industry. For example, pectin can be used as a food additive to increase the viscosity, stability, and taste of food. However, it should be noted that the discussion here mainly focuses on the application of casein (Sephadex G-25) in the field of biochemistry.
Exploration of applications in other fields
(1) As a bonding agent
Casein (different from cheese acid but both derived from dairy products) has strong adhesive strength after reacting with alkali and is commonly used in the manufacture of adhesives. Although cheese acid itself is not directly used as an adhesive, its chemical properties suggest that through appropriate chemical modifications, cheese acid or its derivatives may also find applications in the field of adhesives.
(2) Application in Coatings and Paper Industry
Casein coatings are easy to dye and have a glossy finish in the paper industry, and can be used to make certain containers and special painting paper. Although cheese acid itself is not directly used for these applications, the potential applications of polysaccharide materials such as pectin in the coatings and paper industries are worth further exploration.
(3) Application in Leather Industry
Casein is used as a gloss coating agent in the leather industry. Similarly, although cheese acid itself is not directly used in the leather industry, its chemical structure and properties may inspire us to develop new leather processing or coloring agents.
Swelling and equilibrium
Before use, the cheese acid needs to fully swell and reach equilibrium. This usually requires soaking in a suitable solvent (such as water or buffer) for a period of time.
Column installation and operation
When installing the column, it is important to ensure that the casein particles are evenly distributed to avoid the formation of bubbles or voids. During operation, pay attention to control the flow rate and pressure to avoid unnecessary damage to gel.
Regeneration and Preservation
After use, the cheese acid can be cleaned and regenerated through appropriate regeneration steps for repeated use. When stored for a long time, it should be placed in a dry, cool place to avoid moisture or high temperature.
Security considerations
Although cheese acid itself is generally considered non-toxic, personal protection should still be taken into account during use, such as wearing gloves, masks, and other protective equipment. At the same time, direct contact with the skin or eyes should be avoided. In case of accidental contact, rinse immediately with plenty of water and seek medical assistance.
adverse reaction
Sephadex G-25 is a gel filter filler prepared by crosslinking dextran and epichlorohydrin, which belongs to the classic product of Sephadex series (such as G-10, G-15, G-25, etc.). Its core function is to achieve material separation through molecular sieve effect, which is widely used in industrial desalination, buffer displacement, peptide purification, and biomolecule separation. This filler can handle peptides and spherical proteins with molecular weights ranging from 1000 to 5000, or linear glucan molecules with molecular weights ranging from 100 to 5000, by controlling the crosslinking degree to adjust the swelling degree and molecular separation range. Its physical form is white beads or powder, with stable chemical properties, insoluble in water and weak acid-base solutions, but may undergo glycosidic bond decomposition under strong acid conditions.
Adverse reactions caused by direct contact
Skin irritation and allergic reactions
Sephadex G-25 powder may cause mechanical irritation to the skin, leading to contact dermatitis. Typical symptoms include redness, itching, burning sensation, and pain, and in severe cases, blisters or exudative rash may appear. This type of reaction is more common among operators who are not wearing protective gloves, especially those who have been in long-term repeated contact. For example, a laboratory staff member experienced persistent erythema and itching on the skin of their hands due to not wearing gloves when handling powder. After rinsing with clean water and treatment with anti irritating ointment, the condition was relieved.
Eye injury
Powder or solution splashing into the eyes may cause serious irritation, manifested as conjunctival congestion, tearing, photophobia, and blurred vision. Long term or repeated exposure may increase the risk of corneal injury, such as shedding of corneal epithelial cells or scar formation. The Safety Data Sheet (SDS) categorizes it as "serious eye injury/eye irritant" (H319), emphasizing the need to wear protective goggles or face shields during operation.
Respiratory irritation
Inhaling powder or aerosol particles may cause symptoms such as cough, sore throat, shortness of breath, and chest tightness. Long term exposure may lead to respiratory inflammation or decreased lung function, especially when operating in poorly ventilated environments with higher risks. For example, a researcher who did not wear a mask during long-term powder processing gradually developed persistent coughing and shortness of breath, and lung function tests showed mild impairment of small airway function.
Sephadex G-25 remains a cornerstone of biomolecular separation due to its simplicity, efficiency, and versatility. While newer technologies like spin columns and magnetic beads offer convenience, Sephadex G-25's cost-effectiveness and scalability ensure its continued relevance in both research and industrial settings. Future advancements may focus on enhancing resolution, reducing run times, and integrating with automated platforms for high-throughput applications.
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