Polysorbate 20, 40, 60 and 80: A Practical Comparación Guide
Polysorbates are among the most ampliamente utilizados no iónico emulsificantes in pharmaceuticals, food, and cuidado personal. The number in each grade name reflects the Ácido graso used in fabricar — lauric (20), palmitic (40), stearic (60), or oleic (80) — and that single structural difference drives HLB, physical form, solubility, and where each grade performs best. This guide compares all four major grades with Ejemplos de formulación across industries and explains how to pair polysorbates with low-HLB co-emulsificantes for stable O/W systems. Venus Ethoxyethers fabrica polysorbates for pharmaceutical, cosmetic, and food Aplicaciones from etoxilación facilities in India and the Estados Unidos, with more than 30 years of specialty chemical experiencia en fabricación.
Cuáles son polysorbates?
Polysorbates (commercially known as Tweens) are polyoxyethylene sorbitan Ácido graso esters producido mediante esterifying sorbitan with a specific Ácido graso, then ethoxylating with óxido de etileno (typically approximately 20 moles EO per mole of sorbitan ester). They are no iónico, relatively mild, and function as excellent O/W emulsificantes and solubilizers across a wide pH range.
The sorbitan backbone provides multiple esterificación sites, so commercial polysorbates are mixtures of mono-, di-, and tri-esters. Pharmacopeia grades specify limits on composición and impurities (peroxides, dioxane, lead) appropriate for pharmaceutical and food use.
Venus Ethoxyethers fabrica polysorbates for pharmaceutical, cosmetic, and food Aplicaciones from etoxilación facilities in India and the Estados Unidos, supplying consistent quality to formuladores worldwide.
Quick Comparación table
| Grade | Ácido graso | Approx. HLB | Physical form | Typical Aplicaciones |
|---|---|---|---|---|
| Polysorbate 20 | Lauric (C12) | ~16.7 | Yellow liquid | Essential oil solubilization, biochemical washes, mild cosmetics |
| Polysorbate 40 | Palmitic (C16) | ~15.6 | Yellow liquid | Food emulsions, ointment bases |
| Polysorbate 60 | Stearic (C18) | ~14.9 | Yellow waxy solid/liquid | Bakery, ice cream, creams, hair products |
| Polysorbate 80 | Oleic (C18:1) | ~15.0 | Amber liquid | Vaccines, biologics, salad dressings, skin care |
How the Ácido graso chain affects Rendimiento
Shorter saturated chains (lauric in PS 20) increase solubilidad en agua and HLB, making PS 20 the strongest solubilizer of the family. Longer saturated chains (stearic in PS 60) add waxy body and are favoured in food and cosmetic creams where a thicker emulsion is desired. The insaturado oleic chain in PS 80 provides liquid form at room temperature and excellent compatibility with oleic-rich oils, proteins, and biological matrices — which is why PS 80 dominates vaccine and biologic formulaciones.
Polysorbate 20 (Tween 20) — worked examples
Example 1 — Essential oil room spray: 1% polysorbate 20 solubilizes 0.5% fragrance oil in water without cloudiness. Pre-mix fragrance and PS 20 before diluting into water. Increase to 2% PS 20 for complex resinous oils.
Example 2 — ELISA wash buffer: 0.05–0.1% Tween 20 reduces nonspecific binding on microplates while maintaining protein activity. PS 20 blocks hydrophobic binding sites on plastic without denaturing captured antibodies.
Example 3 — Oral liquid vitamin: Polysorbate 20 at 0.5–2% helps suspend and solubilize fat-soluble vitamins (A, D, E, K) in aqueous syrup bases. Pair with medium-chain triglyceride oil carrier for the vitamin concentrate.
Example 4 — Micellar water: PS 20 at 1–2% with mild co-tensioactivo solubilizes makeup residues and sebum without the harshness of primary anionics.
Polysorbate 60 vs 80 in food
Ice cream (Polysorbate 80): At 0.3–0.5%, PS 80 reduces ice crystal size during freezing, improves melt resistance, and gives a smoother mouthfeel. A typical industrial batch might use 0.4% PS 80 with 0.2% mono/diglycerides. PS 80 lowers mix viscosity during ageing, improving overrun.
Bread and cakes (Polysorbate 60): PS 60 strengthens gluten networks, increases loaf volume, and extends shelf life by slowing starch retrogradation. Bakery formulaciones often use 0.3–0.5% PS 60 blended with sodium stearoyl lactylate (SSL).
Chocolate (Polysorbate 80): Reduces viscosity during conching and improves mould release at 0.2–0.4%. PS 80 acts as a lipophilic emulsificante that interacts with cocoa butter crystals.
Salad dressing (Polysorbate 80): PS 80 stabilizes O/W vinaigrette emulsions at 0.3–0.6%, often paired with xanthan gum for viscosity and long-term estabilidad.
Pharmaceutical and vaccine examples
Polysorbate 80 is the dominant grade in injectables and biologics because oleic-acid-derived esters solubilize proteins and prevent aggregation during storage and freeze-thaw cycles.
- Protein stabilizer: 0.01–0.1% PS 80 in monoclonal antibody formulaciones prevents surface denaturation at the air–liquid interface and at container walls.
- Vaccine adjuvant carrier: PS 80 helps disperse oil-phase antigens in subunit and recombinant vaccines.
- Topical cream: PS 60 (1–3%) with cetyl alcohol and Ácido esteárico builds stable O/W creams for dermatology. Pair with sorbitan stearate (Span 60) for HLB balance near 10–12.
- Ophthalmic solutions: PS 80 at trace levels (0.01–0.05%) stabilizes lipophilic actives in aqueous eye drops.
Polysorbate 40: the middle ground
Polysorbate 40 sits between PS 20 and PS 60 in HLB and chain length. It appears in food emulsions, ointment bases, and cosmetic lotions where a palmitic-derived emulsificante offers a balance between solubility and body. PS 40 is less common than PS 20, 60, and 80 but is specified in some pharmacopeial formulaciones and food additive systems.
How to choose: decision checklist
- Need maximum solubilization of light oils or fragrances? → Polysorbate 20 (highest HLB, shortest chain).
- Food emulsion with solid fat character or bakery application? → Polysorbate 60 (stearic, waxy body).
- Protein, vaccine, or oleic-oil based system? → Polysorbate 80 (oleic, liquid, biocompatible).
- Ointment or palmitic-oil compatibility? → Polysorbate 40.
- Pair with low-HLB co-emulsificante: Blend PS 80 (HLB ~15) with sorbitan oleate (HLB ~4.3) for optimal system HLB near 8–10 for O/W emulsions containing mineral oil or vegetable oil.
HLB blending example
For a mineral oil O/W cream (required HLB ~10.5): blend 30% Span 60 (HLB 4.7) with 70% Polysorbate 60 (HLB 14.9) to achieve system HLB = 0.3 × 4.7 + 0.7 × 14.9 = 1.4 + 10.4 = 11.8. Use 4% total emulsificante blend on formula weight. See the HLB scale guide for more worked examples.
Origin of the polysorbate structure and the Tween name
Polysorbates emerged from tensioactivo research in the 1930s and 1940s into sorbitan esters — products of dehydrating sorbitol (itself derivado de glucose) into cyclic sorbitan, then esterifying the remaining hydroxyl groups with a Ácido graso. Ethoxylating these sorbitan esters with óxido de etileno converts the water-insoluble sorbitan ester into a water-dispersible no iónico tensioactivo. Atlas Powder Company, the same company where William Griffin later developed the HLB system, commercialized these products under the trademark Tween, a name still used colloquially and in some regulatory and scientific literature interchangeably with "polysorbate." The formal polysorbate numbering (20, 40, 60, 65, 80, 85) reflects both the Ácido graso used and the degree of etoxilación, with "polysorbate 20" being shorthand for polyoxyethylene (20) sorbitan monolaurate.
Regulatory recognition followed commercial adoption. Polysorbates 20, 60, 65, and 80 received European food additive status under the E-number system (E432–E436) beginning in the 1960s–70s, and each is described by a monograph in USP-NF and the European Pharmacopoeia specifying acid value, hydroxyl value, and limits on residual óxido de etileno, dioxane, and peroxides. Because commercial polysorbates are complex mixtures of mono-, di-, and tri-esters together with free Polietilenglicol and sorbitan species, pharmacopoeial testing focuses on functional specifications (HLB-relevant parameters and purity limits) rather than a single defined molecular structure — an approach consistent with how most industrial no iónico tensioactivos are characterized and controlled.
Regulatory and quality considerations
Polysorbates are listed in USP-NF, Ph. Eur., and food additive normativas (E432–E436) for specified grades. Pharmaceutical and injectable Aplicaciones require tight limits on peroxides, óxido de etileno residues, and dioxane. Venus supplies polysorbates meeting pharmacopeia and food-grade specifications from Fabricación sites in India and the Estados Unidos.
See our detailed polysorbate product page for CAS numbers and specifications, tensioactivo vs emulsificante for functional context, and contact us to request samples or a quote.