Sodium dodecyl sulfate CAS：151-21-3
Sodium dodecyl sulfate is an anionic surfactant, and is a typical representative of sulphate-based surfactant. It is abbreviated as SDS, and also known as AS, K12, coco alcohol sulfate, sodium lauryl sulfate and foaming agent. The commercial products are usually white to light yellow crystalline powder. It is non-toxic, slightly soluble in alcohol, insoluble in chloroform and ether, soluble in water, and has good anionic and nonionic complex compatibility. It has good emulsibility, foamability, and foaming, infiltrating, decontaminating and dispersing properties. It is abundant in foams and quickly biodegradable, and has solubility next only to fatty alcohol polyoxyethylene ether sodium sulphate (abbreviated as AES). It is not sensitive to alkali and hard water, but its stability is inferior to general sulfonate under acidic conditions and is close to AES. It is not favorable to exceed 95 °C upon long-term heating, and its irritation is at the middle level among surfactants, with an irritation index of 3.3 for a 10% solution, which is higher than AES and lower than sodium dodecyl benzene sulfonate (abbreviated as LAS). Toxicity LD50 is 1300mg/kg. There is no evidence that this product is carcinogenic, but high doses may indeed irritate the skin. However, in general sanitary products the concentration is limited when used as a forming agent, and is in line with national standards. So there is no need to concern.
Sodium dodecyl sulfate is a major component of detergent. It is usually used in the DNA extraction process to separate DNA after protein denaturation. It is often misread as sodium dodecyl sulfonate. It is widely used as a foaming agent in toothpaste, soap, shower gel, shampoo, detergent and cosmetics. 95% of personal care products and household cleaning products contain sodium lauryl sulfate.
The above information is edited by the chemicalbook of Jin Yinxue.
Sodium lauryl sulfate consists of white or cream to pale yellow coloured crystals, flakes, or powder having a smooth feel, a soapy, bitter taste, and a faint odor of fatty substances. It is easily soluble in water.
Applicaion of Sodium dodecyl sulfate
Sodium dodecyl sulfate is an emulsifier and whipping aid that has a solubility of 1 g in 10 ml of water. It functions as an emulsifier in egg whites. It is used as a whipping aid in marshmallows and angel food cake mix. It also functions to aid in dissolving fumaric acid.
Wetting agent, detergent, especially in the textile industry. Electrophoretic separation of proteins and lipids. Ingredient of toothpastes.
Sodium dodecyl sulfate(151-21-3) has excellent detergency, emulsification and foaming power, can be used as detergents and textile auxiliaries, and is also used as an anionic surfactant, toothpaste foaming agent, mine fire extinguishing agents, foaming agents for fire extinguishers, emulsion polymerization emulsifiers, emulsifying and dispersing agents for medical use, shampoo and other cosmetic products, wool detergent, detergent for silky class fine fabrics and flotation agent for metal beneficiation.
GB 2760-96 stipulates as processing aids for food industry. It used as foaming agents; emulsifying agents; and anionic surfactants. It is used for cakes, drinks, proteins, fruits, fruit juice, and edible oil, and so on.
It is used as surfactants, detergents, foaming agents, and wetting agents, and so on.
It is used as relatively low-level ion-pairing reagents, and is cheaper than sodium heptanesulfonate and sodium pentanesulfonate when less demanding.
It is used as raw material for modifying materials.
It is used as additives in capillary electrophoresis analysis and is generally used as molar solution.
It is also used in other analysis such as flow column analysis.
| Sodium dodecyl sulfate Chemical Properties |
| Melting point | 204-207 °C (lit.) |
| density | 1.03 g/mL at 20 °C |
| bulk density | 490-560kg/m3 |
| FEMA | 4437 | SODIUM LAURYL SULFATE |
| Fp | >100°C |
| storage temp. | 2-8°C |
| solubility | H2O: 0.1 M, clear to nearly clear, colorless to slightly yellow |
| form | Powder or Crystals |
| color | White to pale yellow |
| Odor | Slight fatty odour |
| PH Range | 7.2 |
| PH | 6-9 (10g/l, H2O, 20℃) |
| biological source | synthetic (oragnic) |
| Water Solubility | ca. 150 g/L (20 ºC) |
| λmax | λ: 260 nm Amax: 0.3 λ: 280 nm Amax: 0.2 |
| Merck | 14,8636 |
| BRN | 3599286 |
| Cosmetics Ingredients Functions | CLEANSING SURFACTANT - CLEANSING DENATURANT FOAMING |
| InChI | 1S/C12H26O4S.Na/c1-2-3-4-5-6-7-8-9-10-11-12-16-17(13,14)15;/h2-12H2,1H3,(H,13,14,15);/q;+1/p-1 |
| InChIKey | DBMJMQXJHONAFJ-UHFFFAOYSA-M |
| LogP | 1.600 |
| CAS DataBase Reference | 151-21-3(CAS DataBase Reference) |
| EPA Substance Registry System | Sodium lauryl sulfate (151-21-3) |
| Absorption | ≤0.1 at 280nm in water at 30mg/mL |
| Safety Information |
| Hazard Codes | F,Xn,Xi |
| Risk Statements | 36/37/38-36/38-22-11-21/22-42-41-20/21/22-37/38 |
| Safety Statements | 26-36/37-36/37/39-36-22-39 |
| RIDADR | UN 2926 4.1/PG 2 |
| WGK Germany | 2 |
| RTECS | WT1050000 |
| F | 3 |
| TSCA | TSCA listed |
| HazardClass | 4.1 |
| PackingGroup | III |
| HS Code | 29209010 |
| Storage Class | 11 - Combustible Solids |
| Hazard Classifications | Acute Tox. 4 Oral Aquatic Chronic 3 Eye Dam. 1 Skin Irrit. 2 |
| Hazardous Substances Data | 151-21-3(Hazardous Substances Data) |
| Toxicity | LD50 orally in rats: 1288 mg/kg (Walker) |
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