Locust bean gum is a polysaccharide obtained from the endosperm of seeds of the carob tree, Ceratonia siliqua. It is also called carob bean gum and carries the European additive number E 410. Like guar gum, it belongs to the galactomannan family of hydrocolloids.
Its usefulness comes from controlling water. It can increase viscosity, improve body, and reduce separation, but one of its most valuable characteristics is the strong effect it can produce when paired with other gums.
The carob seed supplies the galactomannan
Carob pods contain pulp and hard seeds. Locust bean gum production primarily isolates the seed endosperm, which is rich in a polysaccharide built from a mannose backbone with galactose branches.
Locust bean gum has fewer galactose branches than guar. That structural difference leaves longer relatively unsubstituted regions that can associate with one another and with other hydrocolloids.
It also helps explain why locust bean gum does not hydrate as quickly or completely in cold water as guar and commonly benefits from heating during food processing.
Why it is especially useful in ice cream
Ice cream contains many small ice crystals. During storage and temperature fluctuations, those crystals can grow and make the product feel coarse or icy.
Locust bean gum increases viscosity in the unfrozen phase and limits water mobility. That can slow ice-crystal growth, improve body, and help produce more controlled melting.
It does not eliminate ice crystals—ice is fundamental to the structure of ice cream. The goal is to control crystal size and physical stability.
Dairy products use it for body and water control
Yogurt, dairy desserts, processed cheese, cream products, and selected beverages can use hydrocolloids to manage syneresis, or the release of water, and to preserve a consistent texture over shelf life.
Locust bean gum contributes viscosity and complements dairy proteins and other stabilizers. Recent reviews describe frequent dairy use because of its water-binding and rheological properties.
In reduced-fat formulas, hydrocolloids can also restore some body lost when fat is removed, although they do not reproduce every sensory property of fat.
Its strongest feature may be synergy with other gums
Locust bean gum interacts synergistically with carrageenan and xanthan gum. With the right combination, two hydrocolloids can produce a stronger network or higher viscosity than would be expected from simply adding their individual effects.
With kappa-carrageenan it can modify gel firmness and elasticity. With xanthan it can form highly structured thickened or gelled systems used across many food matrices.
This is why ingredient lists sometimes contain several gums. The combination can allow lower levels of each while producing a more precise texture.
Locust bean gum versus guar gum
Both are seed-derived galactomannans from legumes. Guar has more galactose branching and hydrates readily in cold water, so it develops viscosity quickly.
Locust bean gum has fewer galactose branches, usually requires more heat for full hydration, and offers especially useful interactions with other hydrocolloids. They are therefore not perfect one-for-one substitutes.
Formulators can also use them together when they want both quick viscosity and a different final network structure.
What EFSA has concluded about safety
EFSA re-evaluated E 410 in 2017 and concluded that a numerical Acceptable Daily Intake was not needed and that there was no safety concern for the general population at the refined exposure estimates for reported food-additive uses.
Locust bean gum is practically undigested and not absorbed intact; gut bacteria ferment it. At much higher intakes, that fermentation can affect gastrointestinal tolerance.
EFSA has separately assessed use in foods for infants and young children with special medical needs. Its 2023 evaluation used a population-specific safety approach and should not be confused with the conclusion for the general population.
How to interpret E 410 on a label
Its presence usually points to a texture or stability problem the manufacturer is solving: controlling water, reducing separation, stabilizing freezing, or creating a particular mouthfeel.
The practical rule: locust bean gum is a functional plant fiber extracted from carob seeds. Ice cream and dairy manufacturers use it because it controls water and works particularly well with other hydrocolloids—not because it contributes a carob flavor or because a longer ingredient list is the goal.
Frequently asked questions
Where does locust bean gum come from?
It comes from the endosperm of carob-tree seeds, Ceratonia siliqua.
Why is locust bean gum used in ice cream?
It helps control water and ice-crystal growth, improves body, and supports smoother, more controlled melting.
Is locust bean gum the same as guar gum?
No. Both are galactomannans, but locust bean gum has less galactose branching, hydrates less readily in cold water, and has different synergies with other gums.
Sources
- PubMed — Re-evaluation of locust bean gum (E 410) as a food additive — Opinión EFSA de 2017: no requiere ADI numérica y no plantea preocupación para la población general en la exposición evaluada.
- PubMed — Re-evaluation of locust bean gum in foods for infants and follow-up — Evaluación EFSA de 2023 específica para lactantes y niños con alimentos para usos médicos especiales.
- PubMed — Locust bean gum: processing, properties and food applications — Revisión sobre origen, estructura de galactomanano, hidratación y aplicaciones alimentarias.
- PubMed — Nutritional, biochemical and health properties of Locust beans and applications in food industry — Revisión reciente que describe el uso frecuente de goma garrofín en lácteos por retención de agua y espesamiento.
- PubMed — From nature to nurture: escalating role of locust bean gum — Revisión reciente sobre aplicaciones en lácteos y productos congelados y sinergias con carragenina y xantana.