Cocamidopropyl betaine

Lauramidopropyl betaine
	Structural formula of 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
CAS Number	61789-40-0 ;
3D model (JSmol)	Interactive image; Interactive image; Interactive image;
ChemSpider	19106 ;
ECHA InfoCard	100.057.308
EC Number	263-058-8;
PubChem CID	20280;
UNII	5OCF3O11KX ;
CompTox Dashboard (EPA)	DTXSID6028072 ;
	InChI InChI=1S/C19H38N2O3/c1-4-5-6-7-8-9-10-11-12-14-18(22)20-15-13-16-21(2,3)17-19(23)24/h4-17H2,1-3H3,(H-,20,22,23,24) Key: MRUAUOIMASANKQ-UHFFFAOYSA-N ; InChI=1/C19H38N2O3/c1-4-5-6-7-8-9-10-11-12-14-18(22)20-15-13-16-21(2,3)17-19(23)24/h4-17H2,1-3H3,(H-,20,22,23,24) Key: MRUAUOIMASANKQ-UHFFFAOYAL;
	SMILES CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O; CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC(=O)[O-]; [O-]C(=O)C[N+](CCCNC(=O)CCCCCCCCCCC)(C)C;
Properties
Chemical formula	C19H38N2O3
Molar mass	342.524 g·mol−1
Appearance	Clear to slight yellow liquid
Density	1.05 g/cm3
Melting point	< −10 °C (14 °F; 263 K)
Boiling point	> 100 °C (212 °F; 373 K)
Solubility in water	Soluble
Viscosity	< 100 cP (30°C)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H400
NFPA 704 (fire diamond)	2 1 0
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Cocamidopropyl betaine (CAPB) is a mixture of closely related organic compounds derived from coconut oil and dimethylaminopropylamine.^[2] CAPB is available as a viscous pale yellow solution and it is used as a surfactant in personal care products and animal husbandry. 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

Despite the name cocamidopropyl betaine, the molecule is not synthesized from betaine. Instead it is produced in a two-step manner, beginning with the reaction of dimethylaminopropylamine (DMAPA) with fatty acids from coconut or palm kernel oil (lauric acid, or its methyl ester, is the main constituent). The primary amine in DMAPA is more reactive than the tertiary amine, leading to its selective addition to form an amide. In the second step chloroacetic acid reacts with the remaining tertiary amine to form a quaternary ammonium center (a quaternization reaction).^[3]

CH₃(CH₂)₁₀COOH + H₂NCH₂CH₂CH₂N(CH₃)₂ → CH₃(CH₂)₁₀CONHCH₂CH₂CH₂N(CH₃)₂

CH₃(CH₂)₁₀CONHCH₂CH₂CH₂N(CH₃)₂ + ClCH₂CO₂H + NaOH → CH₃(CH₂)₁₀CONHCH₂CH₂CH₂N⁺(CH₃)₂CH₂CO₂⁻ + NaCl + H₂O

Chemistry

CAPB is a fatty acid amide that contains 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.^{[citation needed]}

Specifications and properties

Cocamidopropyl betaine is used as a foam booster in shampoos.^[4] 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 the irritation that 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.^[5]^[6]^[7]

CAPB is also used as a co-surfactant with Sodium dodecyl sulfate for promoting the formation of gas hydrates.^[8] CAPB, as an additive, helps to scale up the gas hydrates' formation process.^[9]

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

Typical impurities of leading manufacturers today:

Sodium monochloroacetate < 5 ppm
Amidoamine (AA) < 0.3%
Dimethylaminopropylamine (DMAPA) < 15 ppm
Glycerol < 3%

The impurities AA and DMAPA are most critical, as they have been shown to be responsible for skin sensitization 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,^[5]^[6]^[7] but a controlled pilot study has found that these cases may represent irritant reactions rather than true allergic reactions.^[10] 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.^[11]^[12] Other studies have concluded that most apparent allergic reactions to CAPB are more likely due to amidoamine.^[13]^[14] Cocamidopropyl betaine was voted 2004 Allergen of the Year by the American Contact Dermatitis Society.^[15]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h "Cocoamidopropyl-Betaine-CAPB-SDS" (PDF). Acme-Hardesty. Archived (PDF) from the original on 26 May 2021. Retrieved 26 May 2021.
^ 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
^ Stephen A. Lawrence (2004). Amines: Synthesis, Properties and Applications. Cambridge University Press. p. 281.
^ Reich, Charles (1997). "Hair Cleansers". In Martin M. Rieger; Linda D. Rhein (eds.). Surfactants in Cosmetics. Surfactant Science Series. Vol. 68 (2nd ed.). New York: Marcel Dekker, Inc. p. 359. ISBN 978-0-8247-9805-5. Retrieved 9 December 2012.
^ ^a ^b 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. S2CID 42960180.
^ ^a ^b 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. S2CID 9381720.
^ ^a ^b Mowad, C. (2001). "Cocamidopropyl betaine allergy". American Journal of Contact Dermatitis. 12 (4): 223–224. doi:10.1053/ajcd.2001.29549. PMID 11753899.
^ Hande, Vrushali; Choudhary, Nilesh; Chakrabarty, Suman; Kumar, Rajnish (2020-12-01). "Morphology and dynamics of self-assembled structures in mixed surfactant systems (SDS + CAPB) in the context of methane hydrate growth". Journal of Molecular Liquids. 319: 114296. doi:10.1016/j.molliq.2020.114296. ISSN 0167-7322. S2CID 224848279. Archived from the original on 2021-03-09. Retrieved 2020-10-10.
^ Bhattacharjee, Gaurav; Kushwaha, Omkar Singh; Kumar, Asheesh; Khan, Muzammil Yusuf; Patel, Jay Narayan; Kumar, Rajnish (2017-04-05). "Effects of Micellization on Growth Kinetics of Methane Hydrate". Industrial & Engineering Chemistry Research. 56 (13): 3687–3698. doi:10.1021/acs.iecr.7b00328. ISSN 0888-5885. Archived from the original on 2021-03-09. Retrieved 2020-10-10.
^ 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.
^ 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. Archived from the original on 2022-06-25. Retrieved 2022-06-24.
^ 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.
^ 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. S2CID 9944011.
^ 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. S2CID 7933812.
^ History of Allergen of the Year Archived 2014-04-25 at the Wayback Machine. contactderm.org

[msds-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h "Cocoamidopropyl-Betaine-CAPB-SDS" (PDF). Acme-Hardesty. Archived (PDF) from the original on 26 May 2021. Retrieved 26 May 2021.

[2] 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

[3] Stephen A. Lawrence (2004). Amines: Synthesis, Properties and Applications. Cambridge University Press. p. 281.

[RiegerRhein1997-4] Reich, Charles (1997). "Hair Cleansers". In Martin M. Rieger; Linda D. Rhein (eds.). Surfactants in Cosmetics. Surfactant Science Series. Vol. 68 (2nd ed.). New York: Marcel Dekker, Inc. p. 359. ISBN 978-0-8247-9805-5. Retrieved 9 December 2012.

[deGroot-5] 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. S2CID 42960180.

[BrandR-6] 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. S2CID 9381720.

[Mowad-7] Mowad, C. (2001). "Cocamidopropyl betaine allergy". American Journal of Contact Dermatitis. 12 (4): 223–224. doi:10.1053/ajcd.2001.29549. PMID 11753899.

[8] Hande, Vrushali; Choudhary, Nilesh; Chakrabarty, Suman; Kumar, Rajnish (2020-12-01). "Morphology and dynamics of self-assembled structures in mixed surfactant systems (SDS + CAPB) in the context of methane hydrate growth". Journal of Molecular Liquids. 319: 114296. doi:10.1016/j.molliq.2020.114296. ISSN 0167-7322. S2CID 224848279. Archived from the original on 2021-03-09. Retrieved 2020-10-10.

[9] Bhattacharjee, Gaurav; Kushwaha, Omkar Singh; Kumar, Asheesh; Khan, Muzammil Yusuf; Patel, Jay Narayan; Kumar, Rajnish (2017-04-05). "Effects of Micellization on Growth Kinetics of Methane Hydrate". Industrial & Engineering Chemistry Research. 56 (13): 3687–3698. doi:10.1021/acs.iecr.7b00328. ISSN 0888-5885. Archived from the original on 2021-03-09. Retrieved 2020-10-10.

[ShafferKK-10] 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.

[FowlerJF-11] 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. Archived from the original on 2022-06-25. Retrieved 2022-06-24.

[Koting-12] 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.

[FotiC-13] 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. S2CID 9944011.

[Fowler_JF-14] 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. S2CID 7933812.

[contactderm-15] History of Allergen of the Year Archived 2014-04-25 at the Wayback Machine. contactderm.org

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Cocamidopropyl betaine

Production

Chemistry

Specifications and properties

Safety

See also

References

Information related to Cocamidopropyl betaine

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