CAPB (COCAMIDOPROPYL BETAINE)
Global Regulation Summary
Overview of current status across major international markets.
Detailed Regional Status
| Region | Status | Max Conc. | Conditions | Source |
|---|---|---|---|---|
| πͺπΊ EU | Allowed | - | - | Official β |
| πΊπΈ USA | Allowed | - | - | Official β |
| π―π΅ Japan | Allowed | - | - | Official β |
| π°π· Korea | Allowed | - | - | Official β |
| π¬π§ UK | Allowed | - | - | Official β |
πΏ Natural Sources
CAPB is derived from coconut fatty acids (Cocos nucifera), which contain approximately 48% lauric acid (C12), 19% myristic acid (C14), 9% palmitic acid (C16), and smaller amounts of other fatty acids. The coconut oil provides the fatty acid portion, while the betaine structure requires synthetic dimethylaminopropylamine. While coconut-derived, CAPB cannot exist in nature without chemical synthesis of the betaine quaternary structure.
π How It's Made
CAPB is synthesized through a two-step process: (1) Amidation: Coconut fatty acids react with dimethylaminopropylamine (DMAPA) at 160-180Β°C to form cocamidopropyl dimethylamine (an intermediate). This reaction removes water and creates an amide bond. (2) Quaternization: The tertiary amine intermediate is reacted with sodium monochloroacetate (or sodium chloroacetate) at 50-70Β°C in aqueous solution. This converts the tertiary amine to a quaternary ammonium betaine structure. The reaction must be carefully controlled to minimize residual DMAPA, which is a known sensitizer. Unreacted DMAPA can undergo oxidation during storage to form amidoamine (AA) and dimethylaminopropylamine oxide (DMAPAO), which are the primary allergens associated with CAPB. High-quality CAPB contains <50 ppm DMAPA. Some manufacturers use a proprietary 'low-free-amine' process to further reduce these impurities to <10 ppm.
π Uses in Cosmetics
CAPB is used in shampoos (2-5%), body washes (2-4%), facial cleansers (1-3%), baby shampoos (1-2%), and liquid hand soaps (2-4%). It functions as a secondary surfactant, typically combined with anionic surfactants like SLES or SLS in ratios of 1:3 to 1:5 (CAPB:anionic). This combination reduces the irritation potential of the primary surfactant by approximately 30-50% while improving foam density and stability. CAPB also acts as a foam booster, viscosity builder, and provides conditioning effects to hair and skin. At pH 4-5, CAPB is cationic and provides substantivity to negatively charged hair, improving wet-combing and reducing static. At pH 7-9, it is anionic and functions primarily as a cleansing agent. Its amphoteric nature makes it ideal for 'tear-free' baby products. The critical micelle concentration of CAPB is approximately 0.05-0.1% (lower than SLES), making it highly efficient. It performs well across pH 4-10 and is stable in hard water.
π¬ Other Applications
CAPB is used in industrial and institutional cleaning products, particularly in food service and healthcare settings where skin mildness is important. It serves as a detergent in carpet shampoos, car wash formulations, and pet shampoos (where tear-free properties are valued). In agriculture, CAPB is used as an adjuvant in pesticide formulations to improve wetting and spreading. The oil and gas industry employs CAPB in drilling fluids and enhanced oil recovery formulations due to its stability across wide pH ranges and electrolyte compatibility. It is also used in metal cleaning and electroplating baths where foaming control and corrosion inhibition are needed. The global CAPB market was approximately 120,000 metric tons in 2020.
π‘ Fun Facts
- β’ CAPB was first developed in the 1950s-1960s as part of research into 'ultra-mild' surfactants for baby products. Its ability to reduce the irritation of harsh anionic surfactants made it revolutionary in formulation chemistry.
- β’ The American Contact Dermatitis Society named CAPB 'Allergen of the Year' in 2004 due to increasing reports of allergic contact dermatitis. However, subsequent research showed that the allergens are impurities (DMAPA, AA, DMAPAO) from incomplete synthesis, not CAPB itself. High-purity CAPB has significantly lower sensitization rates.
- β’ The 'betaine' name comes from its discovery in sugar beets (Beta vulgaris) in the 19th century, though cosmetic betaines are now synthetically produced and unrelated to the plant extract.
- β’ CAPB is zwitterionic, meaning it has both positive and negative charges on the same molecule at neutral pH. The positive charge is on the quaternary nitrogen, and the negative charge is on the carboxylate group. This unique structure allows it to interact favorably with both anionic and cationic ingredients.
- β’ The pH determines CAPB's charge: below pH 3.5 it is cationic (+), at pH 4-8 it is zwitterionic (Β±), and above pH 9 it is anionic (-). This makes it incredibly versatile across different formulation pH ranges.
- β’ Despite being derived from coconut oil, CAPB is not considered 'natural' under most certification standards (COSMOS, NATRUE, etc.) due to the synthetic quaternization process and the non-natural DMAPA reagent.
- β’ 'Coco' in the name refers to coconut, not cocoa (chocolate). This is a common misconception.
- β’ CAPB improves the viscosity of surfactant systems without adding traditional thickeners. It does this by forming mixed micelles with anionic surfactants, creating elongated worm-like structures that increase solution viscosity.
- β’ The ingredient is biodegradable (>60% in 28 days) and has low aquatic toxicity, making it preferable to some synthetic quaternary compounds in environmentally sensitive applications.
Frequently Asked Questions
What is COCAMIDOPROPYL BETAINE used for in cosmetics?
COCAMIDOPROPYL BETAINE is primarily used for surfactant - cleansing in cosmetic products. It also serves as surfactant - foam boosting, antistatic. The ingredient is commonly found in cleansers, shampoos, and body washes.
Which countries regulate COCAMIDOPROPYL BETAINE?
COCAMIDOPROPYL BETAINE is approved for cosmetic use in all major markets: EU, JP, US, UK, KR, with no significant restrictions.
Where can I find official regulation information about COCAMIDOPROPYL BETAINE?
Official information about COCAMIDOPROPYL BETAINE regulations can be found on government websites: EU CosIng database, US FDA Cosmetics page, Japan MHLW cosmetics standards, UK Government cosmetics guidance, and Korea MFDS. Always verify regulatory status with these official sources before making formulation decisions.
Disclaimer
The information on this website is for educational and informational purposes only and is not intended as medical advice. While we strive for accuracy based on official government databases, cosmetic regulations change frequently. Always consult with a qualified professional or refer to the latest official regulatory documents for compliance. We are not responsible for any actions taken based on the information provided here.