Detergents are governed by a separate EU regulation from cosmetics and food-contact materials. While currently a minor application area for algae, algae-derived surfactants and biopolymers are of growing interest as sustainable alternatives to petrochemical-derived ingredients. This chapter covers the EU detergents framework and its relevance to algae-derived substances.
Regulation (EC) No 648/2004 of the European Parliament and of the Council of 31 March 2004 on detergents, OJ L 104, 8.4.2004, p. 1, EURlex.
Relevance to algae: This Regulation governs the placing on the market of detergents and surfactants within the EU. “Detergent” is broadly defined to include laundry detergents, dishwasher detergents, hard-surface cleaning products, and other surface-active products. Key provisions:
Biodegradability: all surfactants used in detergents must be ultimately biodegradable (pass the ultimate biodegradability test in Annex III). Algae-derived surfactants (glycolipids, biosurfactants from microalgae and associated bacteria) are naturally biodegradable and can readily meet this criterion, which is a commercial advantage over many synthetic alternatives.
Labelling: detergents must be labelled with a list of ingredients (by category), a dosage recommendation, and precautionary statements. Ingredients derived from algae are typically listed by their INCI name or a descriptive name consistent with the ingredient list format specified in the Regulation.
Safety data sheets (SDS) must accompany professional-use products; ingredient safety information for algae-derived surfactants must be included.
Phosphate restrictions: Annex VIa to the Regulation limits phosphates in laundry and dishwasher detergents. This is relevant for algae only indirectly — it is one of the reasons for growing interest in bio-based and algae-derived alternatives to phosphate-containing builders.
A revision of the Detergents Regulation is ongoing (as of 2025), aimed at extending the biodegradability framework and integrating new substances (including microplastics, endocrine disruptors, and bioaccumulative substances). Algae-derived ingredients are generally well-positioned under this revised framework.
Several types of algae-derived surfactant-relevant compounds are under commercial development:
Glycolipids (e.g. mannosylerythritol lipids from microorganisms associated with algae cultivation, or sophorolipids from yeasts grown on algal substrates) — natural biosurfactants with good biodegradability profiles.
Polysaccharides as viscosity modifiers — carrageenan and alginates from red and brown seaweeds are used in cosmetic and personal care formulations; their use in detergent formulations as thickeners or stabilisers is also possible.
Agar and algal hydrocolloids — some detergent formulations use agar-based gelling agents.
Algal-derived biopolymers — research interest in algal polyhydroxyalkanoates (PHAs) and other biopolymers as alternatives to synthetic polymer-based detergent additives.
Novel algae-derived surfactant compounds not previously used in detergents may need to be assessed against REACH registration requirements (see below) before commercial use.
Regulation (EC) No 1907/2006 on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) EURlex applies to chemical substances placed on the EU market, including surfactants and other functional chemicals derived from algae. Key points:
Substances produced at or imported above one tonne per year must be registered with ECHA; existing REACH registrations for established surfactants may cover algae-derived equivalents if they are the same chemical substance.
Novel algae-derived substances with unique chemical structures (not already registered) require new REACH registrations.
Natural substances derived from plants, animals or microorganisms that are used without modification may benefit from certain REACH exemptions, but the scope of these exemptions must be assessed case-by-case.