Agar agar
Agar agar is a natural hydrocolloid, a highly purified gelling and thickening agent obtained from red seaweeds. In the food industry it is used as a thermostable gelling additive (E406) with strong ability to form firm, clear and elastic gels at low dosages. It has a neutral taste and odour, allowing full preservation of the sensory profile of the final product. Agar agar is widely used in vegan, vegetarian and clean label formulations, where it replaces animal-derived gelatin.
Source
Agar agar is produced by extracting polysaccharide components (mainly agarose and agaropectin) from selected species of red seaweeds, most commonly from the genera Gelidium, Gracilaria and Pterocladia. After harvesting, the algae are washed, extracted in hot water, filtered and then cooled to form a gel, which is subsequently frozen, pressed, dried and milled into powder or flakes. The final quality depends on seaweed species, geographical origin, purification technique and control of key parameters such as gel strength, viscosity and colour.
Variations
The market offers a wide range of agar agar products tailored to different technological requirements:
- standard agar powder with defined gel strength;
- special fast-dissolving agar for rapid processes;
- agar blends optimised for specific applications (e.g. dairy desserts, jelly candies, toppings);
- agar with adjusted gelling and melting temperatures for particular filling and heat-treatment processes.
The main differences between grades relate to gel strength, gelling temperature, melting temperature, gel clarity and compatibility with other hydrocolloids and sugars.
Applications In The Food Industry
Confectionery Industry
Agar agar is widely used in the production of jelly candies, marmalades, jelly fillings and glazes. It enables:
- formation of firm, sliceable and stable gels;
- high resistance to elevated storage and distribution temperatures;
- well-defined texture and high shape recovery after deformation.
It is particularly suitable for vegan and vegetarian sweets, as well as for recipes with reduced levels of animal gelatin.
Dairy Industry
In dairy and plant-based alternative products (puddings, milk or plant-based desserts, fermented drinks), agar agar is used for:
- texture stabilization and prevention of whey or water separation;
- creating a smooth, creamy and consistent structure;
- improving cuttability and stability of European-style dairy desserts and topping creams.
It is compatible with various protein and sugar systems, which ensures reliable performance in sterilised and UHT products.
Beverage Industry
In the beverage industry, agar agar is applied for:
- stabilisation of cloudy drinks and fruit juices;
- preparation of suspensions with pulp or fruit particles;
- production of “nata-like” and jelly drinks with gel particles.
Low levels of agar improve phase stability, prevent sedimentation and ensure homogeneous particle distribution during shelf life.
Frozen Foods Industry
In frozen desserts, semi-prepared dishes and ready-to-eat frozen meals, agar agar:
- stabilises structure during freeze–thaw cycles;
- reduces water loss and syneresis upon thawing;
- helps preserve the shape and integrity of components (e.g. fillings and topping layers).
It is especially useful in products that require clearly defined layers or components with firm yet elastic texture.
Benefits Of Use
The use of agar agar provides multiple technological and market advantages:
- strong gelling power at low dosages and high thermal stability of gels;
- broad compatibility with sugars, acids and other stabilisers;
- neutral taste and odour, with good clarity and colour stability;
- suitable for vegan, vegetarian, halal and kosher formulations;
- ideal for clean label and plant-based products as a natural additive with high soluble fibre content.
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