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When you’re drawn to the vast array of “aluminum-free” and “natural” deodorant products, one ingredient that keeps popping up on the ingredient lists is zinc ricinoleate. What exactly is this ingredient? How does it eliminate odors? How does it differ from zinc oxide, which also contains “zinc”? Does its natural origin and safety hold up to scrutiny? This article will clarify all of these points.
Zinc ricinoleate, CAS 13040-19-2. Its main structure consists of a salt formed by a zinc ion and ricinoleic acid—a fatty acid derived from castor oil—and is also known as zinc diricinoleate.
Ricinoleic acid is a long-chain unsaturated fatty acid with a hydroxyl group, obtained from castor oil through hydrolysis. It reacts with zinc-containing compounds (such as zinc oxide) to form zinc ricinoleate.
Pure zinc ricinoleate is typically a white to pale yellow waxy solid or powder that is insoluble in water. Commercial products are often formulated as aqueous dispersions or oil-soluble formulations to facilitate use by formulators.
According to the International Organization for Standardization’s (ISO) 16128 classification of natural cosmetic ingredients, zinc ricinoleate is defined as a “naturally derived ingredient,” and its natural index typically reaches 1 (the highest level).
Its primary raw material, castor oil, comes from castor beans and is a time-honored, renewable vegetable oil. Zinc, on the other hand, is widely found in nature in mineral form.
The process from castor oil to ricinoleic acid, and finally to the end product combined with zinc, involves hydrolysis and neutralization reactions. This means that you cannot directly extract “zinc ricinoleate” from nature.
| Comparison Dimension | Zinc Ricinoleate | Zinc Oxide |
|---|---|---|
| Chemical nature | Organic zinc salt (zinc + fatty acid) | Inorganic oxide (ZnO) |
| Raw material source | Castor oil + mineral zinc | Natural minerals (e.g. zinc ore) |
| Appearance & formulation compatibility | Waxy solid; can be formulated into transparent or translucent formulas | White powder; poorly soluble in water, tends to leave white cast upon application |
| Core function | Molecular‑level chemical neutralization of odor‑causing molecules | Physical UV blocking, astringency, bacteriostatic effect |
| Mechanism of action | Traps and encapsulates sulfides & short‑chain fatty acids to suppress their volatilization | Adsorption, forms physical film, releases trace zinc ions for bacteriostasis |
| Typical applications in cosmetics | Deodorant stick, roll‑on deodorant, spray, foot care products, oral care | Primary sunscreen agent, diaper rash ointment, astringent lotion, makeup foundation |
| Deodorant performance | Specific odor elimination; does not affect perspiration or skin microbiota | Auxiliary body‑odor reduction; relies mainly on astringency & adsorption; may cause white cast |
The primary cause of body odor is that odorless sweat secreted by sweat glands is broken down by the symbiotic bacterial flora on the skin’s surface into smaller, odor-producing compounds. These odor compounds are volatile, meaning they evaporate and reach your nose.
Zinc ricinoleate selectively forms coordination bonds with these odor molecules (fatty acids or sulfides), creating stable, non-volatile macromolecular zinc salts, which naturally prevent us from detecting the odor.
It is worth noting that zinc ricinoleate purely neutralizes odors; it does not inhibit sweating or disrupt the microecological balance of the skin or mouth. It works in harmony with the body’s physiology, and as long as the substance remains on the skin, it can continuously capture newly produced odors without causing stinging or posing a risk of dependency.
1. Personal Care Deodorant Products: This is the main market. In deodorant sticks, roll-on gels, deodorant creams, and botanical sprays, zinc ricinoleate concentrations typically range from 0.5% to 5%. It enables transparent formulations that do not stain clothing, making it a star ingredient in the “aluminum-free” trend. It allows formulators to claim “24-hour odor control” without disrupting the skin’s natural microbiome.
2. Home Odor Control: Fabric softeners, laundry detergents, pet pads, and odor-eliminating sprays for cars, kitchens, and bathrooms. At concentrations of 0.5%–2.0%, it effectively removes a variety of odors, including cigarette smoke and isovaleric acid.
3. Oral Care: A significant portion of bad breath stems from volatile sulfur compounds present on the tongue and in the periodontal area. Toothpastes and mouthwashes containing zinc ricinoleate effectively capture these sulfur compounds, providing a “fresh breath” sensation. Unlike harsh antibacterial mouthwashes, it gently maintains the oral microbiome without causing changes in taste or staining, and is even used in some professional product lines targeting stubborn bad breath.
4. Odor Control in Industrial Environments: Odor control in wastewater treatment plants, waste transfer stations, food processing plants, and livestock farms; demonstrates significant effectiveness in removing malodorous gases such as ammonia and hydrogen sulfide
5. Materials Processing Applications:
Plastics / Rubber / Leather: Deodorization of shoe materials and automotive interiors; reduces VOCs while providing lubrication, plasticization, and stabilization
6. Coatings / Inks: Anti-settling agents, dispersants, and flow agents to enhance product stability and application performance
7. Pharmaceuticals and Personal Care: Bases for topical ointments, raw materials for zinc supplements, and emulsifying stabilizers for color cosmetics, offering both water-resistant properties and gentle skin care benefits
8. Other Functions: Raw materials for adhesives, gelling agents, anti-caking agents, and light-blocking agents; can partially replace certain synthetic raw materials
The final safety assessment report on zinc ricinoleate published by the U.S. Cosmetic Ingredient Review (CIR) Expert Panel states that zinc ricinoleate is safe when used in cosmetics at current concentrations and in current applications. Furthermore, it is readily biodegradable, has minimal impact on ecosystems, and is consistent with green design principles.
Jinan Jinbon is a professional supplier of chemical raw materials, offering zinc ricinoleate in various grades. We also provide competitive pricing on ethylene glycol. If you are interested to buy zinc ricinoleate, please feel free to contact us at any time.
We are always committed to delivering optimal chemical solutions for all application scenarios.
