Cocamidopropyl betaine

Lauramidopropyl betaine

Lauramidopropyl betaine, the major component of cocamidopropyl betaine
Names
IUPAC name
{[3-(Dodecanoylamino)propyl](dimethyl)ammonio}acetate
Other names
2-[(3-Dodecanamidopropyl)dimethylaminio]acetate
Identifiers
61789-40-0 YesY
3D model (Jmol) Interactive image
Interactive image
Interactive image
ChemSpider 19106 YesY
ECHA InfoCard 100.057.308
EC Number 263-058-8
PubChem 20280
UNII 5OCF3O11KX N
Properties
C19H38N2O3
Molar mass 342.52 g·mol−1
Hazards
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
1
2
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Cocamidopropyl betaine (CAPB) is an organic compound derived from coconut oil and dimethylaminopropylamine.[1] CAPB is available as a viscous pale yellow solution and it is used as a surfactant in personal care products. The name reflects that the major part of the molecule, the lauric acid group, is derived from coconut oil. Cocamidopropyl betaine to a significant degree has replaced cocamide DEA.

Production

Cocamidopropyl betaine can be viewed as the combination of cocamide and glycine betaine. However, it is synthesized by combining chloroacetic acid with the amide derived from dimethylaminopropylamine and fatty acids from coconut oil (mainly lauric acid):[2]

CH3(CH2)10C(O)N(H)CH2CH2CH2N(CH3)2 + ClCH2CO2H + NaOH → CH3(CH2)10C(O)N(H)CH2CH2CH2N+(CH3)2CH2CO2− + NaCl + H2O

Chemistry

CAPB is a fatty acid amide containing a long hydrocarbon chain at one end and a polar group at the other. This allows CAPB to act as a surfactant and as a detergent. It is a zwitterion, consisting of both a quaternary ammonium cation and a carboxylate.

Specifications and properties

Cocamidopropyl betaine is used as a foam booster in shampoos.[3] It is a medium strength surfactant also used in bath products like hand soaps. It is also used in cosmetics as an emulsifying agent and thickener, and to reduce irritation purely ionic surfactants would cause. It also serves as an antistatic agent in hair conditioners. which most often does not irritate skin or mucous membranes. However, some studies indicate it is an allergen.[4][5][6] It also has antiseptic properties, making it suitable for personal sanitary products. It is compatible with other cationic, anionic, and nonionic surfactants.

CAPB is obtained as an aqueous solution in concentrations of about 30%.

Typical impurities of leading manufacturers today:

The impurities AA and DMAPA are most critical, as they have been shown to be responsible for skin sensitation reactions. These by-products can be avoided by a moderate excess chloroacetate and the exact adjustment of pH value during betainization reaction accompanied by regular analytical control.

Safety

CAPB has been claimed to cause allergic reactions in some users,[4][5][6] but a controlled pilot study has found that these cases may represent irritant reactions rather than true allergic reactions.[7] Furthermore, results of human studies have shown that CAPB has a low sensitizing potential if impurities with amidoamine (AA) and dimethylaminopropylamine (DMAPA) are low and tightly controlled.[8][9] Other studies have concluded that most apparent allergic reactions to CAPB are more likely due to amidoamine.[10][11] Cocamidopropyl betaine was voted 2004 Allergen of the Year by the American Contact Dermatitis Society.[12]

See also

References

  1. ↑ Christian Nitsch, Hans-Joachim Heitland, Horst Marsen, Hans-Joachim Schlüussler, "Cleansing Agents" in Ullmann’s Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a07_137
  2. ↑ Stephen A. Lawrence (2004). Amines: Synthesis, Properties and Applications. Cambridge University Press. p. 281.
  3. ↑ Reich, Charles (1997). "Hair Cleansers". In Martin M. Rieger; Linda D. Rhein. Surfactants in Cosmetics. Surfactant Science Series. 68 (2nd ed.). New York: Marcel Dekker, Inc. p. 359. ISBN 978-0-8247-9805-5. Retrieved 9 December 2012.
  4. 1 2 De Groot, A. C.; Van Der Walle, H. B.; Weyland, J. W. (1995). "Contact allergy to cocamidopropyl betaine". Contact dermatitis. 33 (6): 419–422. doi:10.1111/j.1600-0536.1995.tb02078.x. PMID 8706401.
  5. 1 2 Brand, R.; Delaney, T. A. (1998). "Allergic contact dermatitis to cocamidopropylbetaine in hair shampoo". The Australasian journal of dermatology. 39 (2): 121–122. doi:10.1111/j.1440-0960.1998.tb01264.x. PMID 9611386.
  6. 1 2 Mowad, C. (2001). "Cocamidopropyl betaine allergy". American Journal of Contact Dermatitis. 12 (4): 223–224. doi:10.1053/ajcd.2001.29549. PMID 11753899.
  7. ↑ Shaffer, K. K.; Jaimes, J. P.; Hordinsky, M. K.; Zielke, G. R.; Warshaw, E. M. (2006). "Allergenicity and cross-reactivity of coconut oil derivatives: A double-blind randomized controlled pilot study". Dermatitis : contact, atopic, occupational, drug. 17 (2): 71–76. PMID 16956456.
  8. ↑ Fowler Jr, J. F.; Zug, K. M.; Taylor, J. S.; Storrs, F. J.; Sherertz, E. A.; Sasseville, D. A.; Rietschel, R. L.; Pratt, M. D.; Mathias, C. G.; Marks, J. G.; Maibach, H. I.; Fransway, A. F.; Deleo, V. A.; Belsito, D. V. (2004). "Allergy to cocamidopropyl betaine and amidoamine in North America". Dermatitis : contact, atopic, occupational, drug. 15 (1): 5–6. PMID 15573641.
  9. ↑ Korting, H. C.; Parsch, E. M.; Enders, F.; Przybilla, B. (1992). "Allergic contact dermatitis to cocamidopropyl betaine in shampoo". Journal of the American Academy of Dermatology. 27 (6 Pt 1): 1013–1015. doi:10.1016/S0190-9622(08)80270-8. PMID 1479082.
  10. ↑ Foti, C.; Bonamonte, D.; Mascolo, G.; Corcelli, A.; Lobasso, S.; Rigano, L.; Angelini, G. (2003). "The role of 3-dimethylaminopropylamine and amidoamine in contact allergy to cocamidopropylbetaine". Contact dermatitis. 48 (4): 194–198. doi:10.1034/j.1600-0536.2003.00078.x. PMID 12786723.
  11. ↑ Fowler, J. F.; Fowler, L. M.; Hunter, J. E. (1997). "Allergy to cocamidopropyl betaine may be due to amidoamine: A patch test and product use test study". Contact dermatitis. 37 (6): 276–281. doi:10.1111/j.1600-0536.1997.tb02464.x. PMID 9455630.
  12. ↑ History of Allergen of the Year. contactderm.org
This article is issued from Wikipedia - version of the 11/13/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.