Alkyl Polyglucoside Surfactants: APG Guide

Alkyl Polyglucosides (APGs): The Sugar-Based Surfactant Family Powering Mild, Sustainable Cleansing

Formulators of shampoos, body washes, facial cleansers, and baby care products face a persistent dilemma: anionic surfactants deliver rich foam and strong cleansing but too often strip the skin barrier and trigger irritation complaints. At the same time, consumers and eco-certification schemes such as COSMOS and NATRUE increasingly demand plant-derived, readily biodegradable ingredients. Alkyl polyglucosides (APGs) resolve this tension elegantly. Manufactured by reacting glucose from starch with fatty alcohols from coconut and palm kernel oils, these nonionic surfactants combine dermatological mildness, hard-water tolerance, and excellent toxicological and environmental profiles — all without ethoxylation, and therefore free of 1,4-dioxane concerns. This guide covers APG chemistry, the commercial INCI grades, formulation strategy, and the global regulatory landscape.

Attribute	Function	Target Applications	Key Specifications	Compliance Status
Family overview	Nonionic surfactant, primary or co-surfactant; foaming, cleansing, wetting, and (long-chain grades) o/w emulsifying	Shampoos, body and facial cleansers, baby wash, sensitive-skin and eco-certified products, hand dishwash, household and agrochemical cleaners	C8–C18 alkyl chains; active matter 50–70% (usually 50% aqueous); HLB ≈ 11–16; degree of polymerization 1.2–1.8	CIR assessed as safe as used; no restrictions under EU 1223/2009; REACH registered; COSMOS/ECOCERT-approved feedstock
Representative grades	Decyl, caprylyl/capryl, lauryl, and coco glucoside — each tuned to a cleansing, solubilizing, or emulsifying role	Syndet and transparent cleansers, wipe solutions, micro-emulsion cleaners, cream and lotion emulsions	INCI: Decyl Glucoside, Caprylyl/Capryl Glucoside, Lauryl Glucoside, Coco Glucoside; pH (10% sol.) 11.5–12.5 typically adjusted to 5–7 in formulation	INCI names harmonized under PCPC/INCI nomenclature; listed in China IECIC; cleared for natural personal care schemes

How APGs Are Made and Why They Work So Gently

Alkyl polyglucosides are manufactured by Fischer glycosylation: a renewable fatty alcohol (typically C8–C14 fractions derived from coconut or palm kernel oil) is reacted with a glucose source — starch hydrolysate or monomeric glucose — under acid catalysis at elevated temperature. Water is continuously removed to drive the equilibrium, and excess fatty alcohol is subsequently stripped off under vacuum. The result is an equilibrium mixture of alkyl monoglucosides, diglucosides, and higher oligoglucosides, characterized by an average degree of polymerization (DP) typically between 1.2 and 1.8. No ethylene oxide, no sulfonation, and no persistent intermediates are involved, which is precisely why APGs contain no 1,4-dioxane residues and biodegrade rapidly.

n C ₆H ₁₂O ₆ (glucose) + R–OH (fatty alcohol) → R–O–(C ₆H ₁₀O ₅) _n (alkyl polyglucoside) + n H ₂O (H ⁺ catalyst)

Fischer glycosylation of starch-derived glucose with a fatty alcohol (R = C8–C18 alkyl) yields the glycosidic surfactant.

Structurally, every APG molecule pairs a hydrophilic sugar head (multiple hydroxyl-bearing glucose units linked by glycosidic bonds) with a lipophilic fatty alcohol tail. This architecture explains the family's signature performance profile:

Mildness to skin and eyes: the bulky, highly hydrated glucose headgroup anchors the molecule at the outermost skin layers, dramatically reducing protein denaturation and lipid extraction compared with sulfate surfactants. The large headgroup also sterically hinders penetration through the stratum corneum, so APGs are poorly absorbed and effectively non-sensitizing at use levels.
Nonionic character with "anionic-like" foam: although nonionic, short and medium-chain APGs foam copiously — unusual for nonionics — because their low degree of ethoxylation-free substitution keeps the headgroup compact. Foam quality improves further in blend with anionics such as sodium laureth sulfate, where APGs boost foam volume and creaminess.
Robustness across conditions: the ether-type glycosidic bond resists hydrolysis across the entire pH range of finished cosmetics (roughly pH 4–9), and the nonionic head does not complex calcium or magnesium ions. APGs therefore retain their cleansing power in hard water and in electrolyte-rich systems.
Rapid, complete biodegradation: both aerobic and anaerobic pathways break APGs down to glucose and fatty alcohol within days, with ultimate biodegradability typically above 90–95% in OECD 301 tests — among the best of all surfactant classes.

The APG Family: Classifying the Commercial Grades

APGs are best classified by fatty-alcohol chain length, which sets the hydrophilic–lipophilic balance (HLB) and therefore the functional role in a formulation. All commercial grades are supplied as roughly 50% active aqueous solutions (some as 60–70% pastes or solids for long-chain types).

Short-Chain Grades (C8–C10): Decyl Glucoside and Caprylyl/Capryl Glucoside

With the shortest hydrophobes, these grades carry the highest effective HLB (roughly 13–16). They are outstanding hydrotropes and solubilizers: they clarify micro-emulsion cleansers, boost the solubility of fragrance and other nonionic surfactants, and keep finished products clear and low-viscosity. Decyl glucoside (CAS 68515-73-1) is the workhorse for gentle facial cleansers and wipes; caprylyl/capryl glucoside excels in all-purpose and hard-surface sprays. Limitations: modest foam stability on its own and negligible emulsifying capacity.

Medium-Chain Grades (C12–C14): Lauryl Glucoside

Lauryl glucoside (CAS 110615-47-9) is the classic primary cleanser of the family. Its C12/C14 tail matches the optimal chain length for micelle formation, delivering dense, creamy foam and strong detergency while remaining dramatically milder than C12 sulfates. It is the first choice for sulfate-free shampoos, baby washes, and sensitive-skin body cleansers, usually at 8–20% active. Limitation: like all APGs, it does not build viscosity with electrolyte, so secondary thickeners are required.

Coconut-Chain Blend: Coco Glucoside

Coco glucoside (CAS 141464-42-8) is produced from unfractionated coconut alcohol (C8–C18 blend), placing its performance between the decyl and lauryl grades. It balances cleansing, mildness, and foam, and its broad chain distribution makes it a forgiving co-surfactant in naturally positioned formulations where a single APG must do several jobs.

Long-Chain Grades (C16–C18): O/W Emulsifiers

Cetyl and stearyl glucosides are lipophilic, wax-like APGs with low HLB used not as cleansers but as primary o/w emulsifiers for creams and lotions. They form liquid-crystal lamellar networks that give skin-feel, water resistance, and self-emulsifying behavior with polyglyceryl esters or fatty alcohols. Limitation: no foaming role; used at 1–3% in emulsion systems.

Across all classes, APGs share two further distinctions worth noting: they are sugar-based nonionic surfactants produced entirely from renewable feedstock, and their performance can be fine-tuned by the degree of polymerization — lower DP favors low viscosity and high detergency, while higher DP increases water solubility and mildness.

Comparative Matrix: APGs Versus Conventional Surfactants

The table below compares the leading APG grades with the anionic and amphoteric surfactants they most often replace or complement in personal care and household cleansing systems.

Surfactant (INCI)	CAS No.	Ionic Type	Water Solubility	Mildness / Sensory	pH Stability	Typical Applications
Decyl Glucoside	68515-73-1	Nonionic	Very high; hydrotropic	Very mild; low-foam clarifier	Excellent (pH 2–12)	Facial cleansers, wipes, sulfate-free blends, hard-surface cleaners
Lauryl Glucoside	110615-47-9	Nonionic	High	Very mild; dense creamy foam	Excellent	Primary cleanser in shampoo, baby wash, body wash
Coco Glucoside	141464-42-8	Nonionic	High	Very mild; balanced foam	Excellent	Co-surfactant for natural cleansers, hand wash, dishwash
Sodium Laureth Sulfate (SLES)	68585-34-2	Anionic	High	Moderate; potential irritation	Good (avoid < pH 5)	Mainstream shampoo and body wash; salt-thickened
Ammonium Lauryl Sulfate	2235-54-3	Anionic	High	Moderate; higher irritation potential than SLES	Good	High-foam economy shampoos
Cocamidopropyl Betaine	61789-40-0	Amphoteric	High	Mild; foam booster; rare sensitization reports	Excellent	Secondary surfactant across all cleanser formats
Caprylyl/Capryl Glucoside	68515-81-1	Nonionic	Very high; hydrotropic	Very mild	Excellent	Solubilizer, eco-cleaners, agricultural adjuvants, gentle cleansers

Formulation SOP: Building With APGs

APGs are easy to process — cold-water soluble, low-odor, and compatible with anionic, amphoteric, and nonionic co-surfactants — but they behave differently from sulfates in two critical areas: viscosity and pH. Commercial APG solutions are supplied at pH 11.5–12.5 for stability, and must be neutralized to the finished-product pH (typically 5.0–7.0) with citric or lactic acid during manufacture.

Step-by-Step Processing

Charge water into the main vessel and begin moderate agitation.
Add the APG grade(s) (as 50% active solution) at the target level. Typical use levels: facial cleanser 5–12% active; sulfate-free shampoo 10–20% active in blend; body wash 8–15%; hand dishwash 5–15%.
Add co-surfactants — amphoteric betaines (2–6%) for foam and viscosity synergy, or the mild anionic of choice (sodium laureth sulfate, sodium lauroyl sarcosinate, sodium cocoyl isethionate) at 1:1 to 1:3 anionic:APG ratios.
Neutralize slowly with a 30–50% citric acid solution to pH 5.0–6.5. Check pH after 24 hours, as APG solutions buffer weakly.
Build viscosity with non-electrolyte thickeners: PEG-150 distearate, PEG-120 methyl glucose dioleate, xanthan gum, or acrylates copolymers at 0.5–2.5%.
Add heat-sensitive ingredients (fragrance, preservative, actives) below 40 °C, then adjust final pH and viscosity.

WARNING — Common Processing Mistakes: Do not attempt to thicken APG-based cleansers with sodium chloride; unlike sulfate systems, APGs show virtually no salt curve, and adding salt can actually thin the formula or cloud it. Never blend APG stock solution with fragrance or preservative before dilution — the high pH (≈12) of the raw material can hydrolyze esters such as parabens or decompose fragrance allergens. Avoid prolonged heating above 60 °C in the presence of reducing sugars, which can trigger Maillard-type browning and odor development.

BEST PRACTICE — Pro Tips for APG Systems: (1) Pair lauryl or coco glucoside with cocamidopropyl betaine and a small dose of sodium lauroyl sarcosinate to obtain sulfate-free foam that consumers perceive as "rich." (2) Use 1–3% decyl glucoside as a hydrotrope to keep fragrance-loaded systems perfectly clear. (3) Because APG grades vary subtly between suppliers (DP distribution, residual alcohol), always re-verify cloud point and viscosity on the specific commercial grade — and source by CAS number through verified channels such as Guidechem supplier listings to compare specifications. (4) For COSMOS or NATRUE certification, document the vegetable origin of both the glucose and the fatty alcohol in your supplier documentation.

Global Regulatory & Compliance Guide

Jurisdiction / Authority	Regulatory Status for Alkyl Polyglucosides
United States — CIR / FDA	The Cosmetic Ingredient Review (CIR) Expert Panel has assessed the alkyl glucosides as safe as used in cosmetics in the present practices of use and concentration. Not a "color additive" nor a drug active; no FDA restriction for rinse-off or leave-on use. Under MoCRA, products must list ingredients by INCI, including all APG grades.
European Union — Regulation (EC) 1223/2009	Alkyl glucosides are not listed in Annex II (prohibited) or Annex III (restricted) and may be used without concentration limits. INCI labeling (e.g., Decyl Glucoside, Lauryl Glucoside, Coco Glucoside) is mandatory under Article 19. The SCCS has raised no safety concerns for the family. Glucosides must be REACH-registered as industrial chemicals.
Natural / Organic Certifications	COSMOS-standard and NATRUE accept APGs manufactured from vegetable fatty alcohols and starch-derived glucose; petrochemical ethoxylation routes are excluded, which APGs inherently avoid. ECOCERT-certified APG grades are commercially available for organic-formulation claims.
Biodegradability & Ecolabels	APGs meet OECD 301 ready-biodegradability criteria and are accepted surfactants in EU Ecolabel and US EPA Safer Choice detergent formulations, supporting "readily biodegradable" environmental claims.
China — NMPA / IECIC	Decyl glucoside, lauryl glucoside, coco glucoside, and caprylyl/capryl glucoside are listed in the Inventory of Existing Cosmetic Ingredients in China (IECIC) and may be used in cosmetics registered or notified under CSAR.
Japan — MHLW	APGs are permitted cosmetic ingredients under the Japanese Standards for Cosmetics with no quantitative restrictions; full ingredient labeling by INCI-Japanese nomenclature applies.

Frequently Asked Questions

Are alkyl polyglucosides truly "natural" surfactants?

APGs are 100% derived from renewable feedstock — glucose from corn or potato starch and fatty alcohols from coconut or palm kernel oil. The glycosidic bond linking them is the same ether-type bond found in natural carbohydrates, and no petrochemical epoxides are used. However, the acid-catalyzed synthesis is a chemical process, so APGs are best described as "naturally derived" rather than unprocessed naturals — a distinction accepted by COSMOS and NATRUE, which certify appropriately sourced APG grades.

Why won't my APG shampoo thicken with salt, and what should I use instead?

Salt thickening relies on charge screening of anionic micelles, and nonionic APGs have no ionic head to screen. Effective alternatives include PEG-150 distearate (1–2%), PEG-120 methyl glucose dioleate, xanthan gum (0.3–1%), or blending with 10–20% cocamidopropyl betaine, which restores a partial salt response. A small amount of an anionic co-surfactant such as sodium laureth sulfate or sodium lauroyl sarcosinate also reintroduces a workable salt curve in hybrid systems.

Do APGs contain 1,4-dioxane or nitrosamines?

No. 1,4-dioxane is a by-product of ethoxylation (ethylene oxide chemistry), and nitrosamines form when secondary amines are nitrosated. APG production involves neither ethylene oxide nor amine intermediates, so both contaminant classes are structurally excluded — a significant advantage for clean-beauty positioning and for manufacturers reformulating away from ethoxylated or ethanolamine-based surfactants.

Which APG grade should I choose for a sulfate-free facial cleanser?

Decyl glucoside is the most common choice because its high water solubility and low irritation potential suit gentle, transparent gel cleansers; lauryl glucoside adds foam density when richer lather is desired, and coco glucoside offers a balanced middle ground. Blending two grades — for example, decyl glucoside with a smaller proportion of lauryl glucoside plus cocamidopropyl betaine — typically delivers the best sensory profile while keeping the formula sulfate-free. More background on surfactant selection is available in the Guidechem encyclopedia.

References

Fiume MM, Heldreth BA, Andersen FA, et al. Safety Assessment of Alkyl Glucosides as Used in Cosmetics. Final Report of the Cosmetic Ingredient Review Expert Panel. Washington, DC: CIR.
Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products. Official Journal of the European Union, L342.
Scientific Committee on Consumer Safety (SCCS), Notes of Guidance for the Testing of Cosmetic Ingredients and their Safety Evaluation, 11th revision.
MoCRA — Modernization of Cosmetics Regulation Act of 2022, United States Food and Drug Administration.
COSMOS-standard AISBL, COSMOS Standard: Natural and Organic Cosmetics Requirements, current version.
NATRUE Label Criteria for Natural and Organic Cosmetics, International Natural and Organic Cosmetics Association.
OECD Guideline for Testing of Chemicals No. 301, Ready Biodegradability, Organisation for Economic Co-operation and Development, Paris.
Regulation (EC) No 1907/2006 concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), as amended.
Inventory of Existing Cosmetic Ingredients in China (IECIC), National Medical Products Administration.
Rybinski W, Hill K. Alkyl Polyglucosides — Properties and Applications of a New Class of Surfactants. Angewandte Chemie International Edition, 1998, 37(10): 1328–1345.
Hill K, von Rybinski W, Stoll G, editors. Alkyl Polyglucosides: Technology, Properties and Applications. Weinheim: VCH Verlagsgesellschaft mbH.
von Rybinski W, Hill K. Alkyl Polyglucosides — Synthesis, Technology, Properties and Applications. In: Novel Surfactants: Preparation, Applications, and Biodegradability. Holmberg K, editor. New York: Marcel Dekker.
EU Ecolabel Criteria for rinse-off cosmetic products and detergent products, Decision (EU) of the European Commission.
Deckner G. Popular Ingredients: Alkyl Polyglucosides (APGs). Innovadex / UL Prospector Knowledge, November 2013.