99% Sodium deoxycholate CAS 302-95-4

What is sodium deoxycholate? How does it work? What are its industrial applications?

1. What is sodium deoxycholate? How does it work?

Sodium deoxycholate is the sodium salt of deoxycholic acid (CAS 83-44-3). It belongs to the bile salt family and is one of the most widely used bile acid anionic surfactants in industry. Molecular formula: C₂₄H₃₉NaO₄, molecular weight: 414.56; CAS No.: 302-95-4; EINECS/EC No.: 206-132-1.

It is a white or slightly off-white crystalline powder at room temperature, with a faint peculiar odour and strong bitter taste. It is readily soluble in water and ethanol, but insoluble in ether. Solubility in water: 330 g/L (15℃). Boiling Point: 547.1°C Melting Point: 357–365°C Specific Optical Rotation: +40.0° to +45.0° (20 mg/mL aqueous solution) Density: Approximately 1.012 (20°C) Flash Point: >110°C pH: 7.5–9.0 (1% aqueous solution) Hygroscopic.

Industrially, it is produced by refining deoxycholic acid extracted from animal bile (cattle, pigs, chickens, etc.) and then neutralising it with sodium hydroxide to form the sodium salt. It is manufactured from renewable natural raw materials.

Structurally, sodium deoxycholate features a cholanoic acid steroid skeleton, bearing hydroxyl groups at the 3α and 12α positions of the steroid ring and a hydrophilic sodium carboxylate group at the terminal end. The whole molecule possesses a unique "planar amphiphilic" structure: one face of the steroid skeleton is the hydrophobic methyl β-face, while the opposite side forms the hydrophilic hydroxyl α-face. This rigid planar structure differentiates it from conventional linear surfactants, endowing it with superior interfacial adsorption capacity, emulsifying performance and biocompatibility.

Chemically, sodium deoxycholate is a typical cholic acid-type anionic detergent (anionic surfactant). Its aqueous solution is weakly alkaline (pH 7.5–9.0), exhibiting excellent surface activity, emulsifying, wetting, dispersing and solubilising power. It can form stable emulsions and mixed micelles with oils, waxes and phospholipids. It is a representative green, bio-based industrial surfactant. Naturally present in animal bile, its physiological function is to emulsify and dissolve dietary fats.

Storage requirements: Keep sealed, moisture-proof, protected from light and away from heat sources.

The industrial-grade sodium deoxycholate described herein is intended for industrial production processes, industrial processing aids and industrial formulation systems, mainly applied in chemicals, cleaning, leather, textiles, agrochemicals, coatings, oil processing, biomanufacturing, new materials and medical devices. The scope of industrial grade excludes biochemical reagent grade (for scientific research), food grade, cosmetic grade and pharmaceutical grade (for direct pharmaceutical use).

Industrial grade is generally tested against the following eight indicators:

1. Content (d.b.) The purity determined by perchloric acid potentiometric titration shall be no less than 97.0% (C₂₄H₃₉NaO₄) on a dried basis, serving as the fundamental purity guarantee for industrial applications.

2. Sodium content 5.0%~6.1% (dry basis). It reflects the degree of salt formation and compositional uniformity and acts as a key quality control indicator for the product.

3. Optical rotation A marker of steroid configuration purity and an important chiral quality index for bile acid products.

In terms of its mechanism of action, sodium deoxycholate owes its unique properties to "planar amphiphilicity + membrane dissolution + protein solubilization + emulsification + micellar solubilization". The mechanisms of action for various industrial applications are as follows:

1. Mechanism of amphiphilic surfactant (planar amphiphilic structure) Sodium deoxycholate has a hydrophobic steroidal methyl face and a hydrophilic hydroxyl face, forming a natural two-sided amphiphilic molecule. It spontaneously adsorbs at oil-water and solid-liquid interfaces and markedly reduces interfacial tension. This underpins its function as an industrial emulsifier, wetting agent, dispersant and cleaning agent.

2. Mechanism of emulsion stabilisation (reduction of oil-water interfacial tension) Sodium deoxycholate adsorbs at the oil-water interface to form a dense interfacial film, lowering interfacial tension and preventing oil droplet coalescence. It disperses oily substances such as oils, waxes and pesticide active ingredients into water as fine droplets to form long-term stable emulsions. This forms the mechanistic basis for industrial emulsification formulations (pesticide emulsifiable concentrates, metalworking fluids, emulsion polymerisation).

3. Wetting and penetration mechanism (reduction of solid-liquid interfacial energy) Sodium deoxycholate reduces the contact angle between water and solid surfaces, improving wettability and enabling aqueous liquids to rapidly penetrate micropores and oil layers within fibres, leather and metal surfaces. It assists cleaning solutions in wetting contaminants and allows treatment liquors to penetrate substrates, which is the core principle behind industrial cleaning, degreasing, leather and textile treatment.

4. Mechanism of micellar solubilization (encapsulation of hydrophobic core) Above the critical micelle concentration (CMC), sodium deoxycholate molecules self-assemble into micelles. The hydrophobic core can encapsulate oil-soluble substances (poorly soluble active ingredients, lipid-soluble components, pigments, etc.) and greatly improve their apparent solubility and dispersion stability in water. This provides the mechanistic foundation for industrial solubilisation formulations and nano-formulation processes.

5. Mechanism of solubilization of proteins/lipids (disruption of hydrophobic interactions) The hydrophobic surface of sodium deoxycholate interacts with exposed hydrophobic domains of proteins and lipids and interferes with intermolecular hydrophobic interactions. Insoluble proteins and lipids dissociate and enter the aqueous phase, with their hydrophobic regions encapsulated by micelles to prevent re-aggregation. This supports cell wall disruption, lipid extraction and decellularization processes in biomanufacturing.

What are the applications of Industrial Grade Sodium deoxycholate?

1. Industrial emulsifiers and emulsion stabilisers (core application, chemical industry)

Application Field: Speciality Chemicals.

Corresponding Products: Industrial emulsions, emulsifying waxes, metal working fluids, cutting fluids, co-emulsifiers for emulsion polymerisation.

Applicability Principle: Sodium deoxycholate is an anionic surfactant that rapidly adsorbs at the oil-water interface to form a dense interfacial film, greatly reducing interfacial tension and inhibiting oil droplet aggregation. Oily materials can thereby be stably dispersed in water to form long-lasting, stable emulsions. Its natural origin and biodegradability align with green chemistry trends, making it a bio-based emulsifier option for industrial emulsification formulations.

2.Industrial cleaning and metal degreasing (main application in the cleaning field)

Application Field: Industrial cleaning

Corresponding Products: Metal parts degreasing agents, industrial degreasing cleaners, equipment maintenance cleaning fluids, precision instrument cleaners.

Applicability Principle: The planar amphiphilic structure of sodium deoxycholate reduces interfacial energy between oil and metal surfaces, penetrates oil films, and emulsifies and removes grease. It rapidly emulsifies and disperses machine oil, rust inhibitors and cutting residues from workshop equipment and metal parts in cleaning fluids, enabling water-based eco-friendly degreasing and partially replacing highly polluting solvent-based cleaners.

3.Auxiliaries for leather degreasing and tanning (leather industry)

Application Field: Leather Manufacture.

Corresponding Products: Leather degreasing agents, water-soaking and liming auxiliaries, fatliquoring emulsifying components, fur processing auxiliaries.

Applicability Principle: Raw hides and furs contain substantial natural fats; incomplete degreasing impairs subsequent tanning and finished leather quality. Sodium deoxycholate emulsifies and disperses intradermal fats and helps degreasing agents penetrate gaps between leather fibres. It is mild towards leather collagen and minimises substrate damage, serving as an effective bio-based degreasing auxiliary in leather pretreatment.

4.Textile scouring and levelling dyeing auxiliaries (textile industry)

Application Field: dyeing, textile industry.

Corresponding products: Scouring agents, degreasing agents, penetrants, levelling agents, auxiliaries for denim washing

Applicability Principle: The cotton and linen fibres contain waxes, pectin and oils which are to be removed by scouring before dyeing. Sodium deoxycholate wets and penetrates fibres, emulsifies and removes natural waxes and oils, improving the performance of scouring and bleaching. Its emulsifying and dispersing properties ensure even distribution in the dye baths, and reduce colour unevenness, which makes it a multi-functional auxiliary for pretreatment and dyeing processes.

5.Wetting and Dispersion of Coatings and Inks (Coatings Industry)

Application Field: : Coating & Ink Industry.

Corresponding Products: Water-based coating wetting and dispersing agents, Pigment dispersing agents, Printing ink emulsifiers, Water-based wood coating additives.

Applicability Principle: Pigments and resins should be uniformly dispersed and have good wettability to the substrate in coatings and inks. Sodium deoxycholate reduces the surface energy of the pigment particles so as to prevent agglomeration and sedimentation, and reduces the contact angle between coating and substrate improving levelling and spreading for uniform film formation and consistent colour . It serves as a secondary wetting and dispersing agent in aqueous systems.

6.Enzymatic processing and lipase activation in the oil and fat industry (oil and fat processing field)

Application Field: Oil and fat processing and bio-refining

Corresponding Products: Enzymatic oil hydrolysis/transesterification processes,, lipase activators, biodiesel enzymatic production aids, oil degumming aids.

Applicability Principle: Sodium deoxycholate is a bile salt that emulsifies oil substrates, increasing the oil-water interfacial area and activating lipases in their active conformation. It provides a good contact between the enzymes and oil thus greatly improving the hydrolysis and transesterification efficiencies. It is a natural enzyme activator and is widely used in oil enzymatic processes and biodiesel production.

7.Templates and dispersants for preparing nanomaterials (new materials area)

Application Field: Nanomaterials & New Materials Industry.

Corresponding Products: Template agents for nanoparticle/nanocapsule preparation, nanopowder dispersants, functional coating additives, aids for industrial production of nanocarriers.

Applicability Principle: Sodium deoxycholate micelles act as soft templates to control nucleation and morphology of nanomaterials. Owing to its amphiphilic structure, it forms an adsorption layer on particle surfaces to generate steric hindrance and electrostatic repulsion, preventing nanopowder agglomeration and securing stable dispersion of nanomaterials in industrial products such as coatings, catalysts and functional films.

8.Wetting agents for electroplating and metal surface treatment (surface treatment field)

Application Field: Electroplating and metal surface treatment industry.

Corresponding Products: Electroplating solution wetting agents, pickling corrosion inhibitors, phosphating aids, metal surface pretreatment solutions.

Applicability Principle: Surfactants used in electroplating and pickling reduce interfacial tension between plating baths and workpieces, eliminating pinholes and gas spots and enhancing coating uniformity. The wetting and emulsifying properties of sodium deoxycholate assist pickling solutions in penetrating oil layers to facilitate degreasing and rust removal, functioning as an auxiliary surfactant in metal surface treatment baths.

Summarize

sodium deoxycholate (CAS 302-95-4) is a natural bile-acid anionic surfactant. It has more than a dozen mature applications, covering industrial emulsification and cleaning (metal degreasing, industrial emulsions), traditional processing auxiliaries (leather degreasing, textile scouring, pesticide emulsification, paint wetting), biomanufacturing (fermentation cell disruption, enzymatic oil processing, biopharmaceutical workflows), new materials and medical devices (nanotemplates, decellularization), electroplating surface treatment, and veterinary drug formulations. Its five major mechanisms of action include planar amphiphilicity, emulsion stabilisation, wetting and penetration, micellar solubilization, and protein/lipid solubilization. Benefiting from natural origin, biodegradability and favourable biocompatibility, it ranks among the most widely used bile salts in green industrial surfactant systems.