Direct Answer: Pick by process, not by thickening power. Without a heat step the options are guar or xanthan, because locust bean gum only disperses in cold water and needs roughly 80–85 °C held for two to three minutes before it develops. Below pH 4, xanthan is the only one of the three relied on to keep its thickness across storage. Where particles have to stay in place at rest, xanthan contributes that structure and the two seed gums contribute body. Freeze-and-thaw performance is the single variable where published sources contradict each other, because it belongs to the system rather than to the gum. What follows compares all three on the variables that decide a formula, gives starting dose windows, explains the one combination that turns two non-gelling gums into a gel, and sets out how to compare cost in use without quoting a price.
1. The Decision in One Page
Guar gum (E412), xanthan gum (E415) and locust bean gum (E410) are all sold as stabilisers and all three will thicken a glass of neutral water. Formulations are not decided there. They are decided by what the factory can do to the powder, what the liquid does to a hydrated gum over weeks of storage, and what the consumer sees when the package has been standing still. Read in that order, the three separate cleanly.
If there is no heat step, locust bean gum is out. It hydrates only after being heated to roughly 80–85 °C and held for two to three minutes, then cooled. In a cold tank it disperses and does very little else. Guar and xanthan both build working viscosity at ambient temperature, provided the powder is dispersed properly rather than dumped into still water.
If the finished product is acidic, the short list is one gum. Guar is practical in the region above about pH 4.0 and loses thickness progressively through storage below it, faster the hotter the product is held. Locust bean gum is not an acid option either. Xanthan is chosen for acidified beverages and vinegar-based dressings precisely because it does not behave that way.
If something has to stay afloat, thickness is not the property being bought. A bottle on a shelf is not flowing, and a viscometer reads flowing liquid. Xanthan leaves structure in a liquid at rest; guar and locust bean gum contribute mainly while the product is being poured or drunk. That is why increasing a seed gum to fix a sediment problem tends to cost mouthfeel before it fixes anything.
If a set rather than a body is wanted, one pairing does the work. None of the three gels on its own at use levels. Xanthan and locust bean gum together do: heated, cooled and left standing, the pair forms a soft, thermoreversible gel. Xanthan and guar together raise viscosity and stop there, which is a useful and cheaper outcome for many systems, but is not a gel.
If the product will be frozen, treat all published rankings as hypotheses. Freeze-thaw behaviour is reported differently for different systems, and the disagreement is documented in this article in section 6. The measurement that settles it takes one batch and a domestic freezer.
| Situation in the plant | Start with | Second option | First measurement to take |
|---|---|---|---|
| Cold-batch ready-to-drink with fine solids: cocoa, tea fines, botanical particulates, nut particles | Xanthan | Xanthan blended with a little guar for body | Sediment height in a filled, sealed bottle against an untreated control, read upright and on its side |
| Acidified drink below pH 4, cold or hot fill | Xanthan | Guar only if pH recovers above 4.0 and the shelf model is short and cool | Viscosity at day zero and after an accelerated hold at the worst storage temperature the product will see |
| Plant milk or oat-style base that needs body without a cook step | Guar | Low-dose xanthan where fruit pieces or added grains are present | Pour rate and the film left on the glass at serving temperature |
| Pourable dressing with herbs, spices and an oil phase | Xanthan | Guar in a low-acid dressing where a short, soft texture is wanted | Creaming height in a graduated tube, plus the height of the herb column |
| Hot-filled sauce that must pour clean and not rope at the nozzle | Locust bean gum, usually with some xanthan | Xanthan alone at a lower dose | Viscosity at two shear rates rather than one, plus a spoon test for stringing |
| Frozen dessert or fruit base that will be thawed and refrozen | Locust bean gum blended with xanthan | Xanthan alone | Free liquid after each cycle at -18 °C, read on the same batch rather than on parallel batches |
| Milk-based drink for young children sold into the European Union | Whichever gum the sensory target requires | A blend, provided the additive plan is built as a sum | Total gum load against the combined ceiling described in section 9 |
| Pale or bright beverage where haze is a fault | Test all three in the actual base | A gum family outside these three | Haze on a fully hydrated and filtered sample, not on a fresh dispersion |
2. The Comparison Table: One Question, Three Answers
Chemical descriptions of these gums overlap so heavily that they are useless for choosing between them. The rows below are the variables that a formulation meeting actually has to settle, and each cell is what a receiving laboratory or a pilot batch can check. Doses are percent of the finished system by weight, not by volume.
| The variable | Guar gum (E412) | Xanthan gum (E415) | Locust bean gum (E410) |
|---|---|---|---|
| Behaviour in cold water | Hydrates at ambient temperature once the particles are separated; builds quickly and reads heavy | Hydrates at ambient temperature and is the most forgiving of the three to disperse | Disperses only. Thickness stays close to that of the water it sits in |
| Heat step required | No | No | Yes: roughly 80–85 °C held for two to three minutes, then cooled |
| Thickness held below pH 4 in storage | No. Hydrolysis thins the product progressively, and a warm hold shortens the time to the same loss | Yes, across the pH range beverages are normally sold in | Not selected for acid work; the heat step is the reason it is chosen |
| Structure while the package stands still | Low. Body rather than rest structure | High. This is the property being bought | Low on its own; contributes through a blend |
| Gels by itself at use levels | No | No | No |
| Gels in combination | With xanthan: a real viscosity synergy, and no gel | With locust bean gum at one to one, heated then cooled: a soft, thermoreversible gel | The same reaction seen from the other side; the ratio decides the set |
| Response to dissolved salt | Dissolved salt is not the first variable to check in beverage work | Ionic strength moves the reading, and published results move in both directions | Dissolved salt is not the first variable to check in beverage work |
| Appearance in the finished liquid | Adds haze, visible in a pale product | Adds haze; a bright product needs a filtration decision | Least haze of the three once fully hydrated, to be confirmed in the actual base |
| Freeze-and-thaw behaviour | Reported ahead of locust bean gum in some starch systems | Reported ahead of locust bean gum in fat and protein systems | Valued where it can co-gel; reported worse than guar in other systems |
| Working dose, by weight of finished product | 0.03–0.05% for body, 0.05–0.08% for light particulate work, 0.08–0.15% for heavy load or frozen formats | 0.05–0.30% suspension, 0.10–0.30% pourable sauce, 0.30–0.80% thick sauce, 0.10–0.30% frozen dairy base | Same order as guar in hot-set work; 0.10–0.30% in frozen dairy bases, and usually blended rather than used alone |
| How it fails when handled badly | Fine grades clump, coarse grades hydrate slowly, and both need more shear than operators expect | Seals a dry core the moment it meets water; those lumps never redisperse and fine filter bags block | Under-hydration rather than lumping: inactive gum travels through the process and settles out afterwards |
Two cautions on reading it. The dose rows are starting windows drawn from published application literature, not release limits; every one of them closes at a different number once the real matrix, water chemistry and target viscosity are in the trial. And the freeze-and-thaw row is deliberately written as three reports rather than three rankings, for the reason set out in section 6.
Two of the three gums have their own working documents on this site, which carry the dose ladders, the verification methods and the specification detail instead of repeating them here: the xanthan gum guide for beverages and dressings and the guar gum guide for ready-to-drink and plant-milk systems. Grade tables, packaging and certificate items sit on the individual product pages, so that this comparison can stay a comparison.
3. Can Any of the Three Be Dosed Into Cold Water?
Two of the three, yes. Guar and xanthan both build working viscosity at ambient temperature, provided the powder is dispersed into motion rather than dumped onto still water. Locust bean gum does not develop cold, and no amount of additional mixing substitutes for the heat it needs. The accurate verb for what any of these gums does in water is disperse, not dissolve. European specification language has now caught up with that phrasing: the January 2026 amendment to the specification for locust bean gum replaces "soluble" with "fully dispersible", and the corresponding amendment for guar gum replaces "solution" and "soluble" with "dispersion" and "dispersible", on the stated grounds that hydrocolloids form colloidal dispersions in water rather than true solutions. Section 9 gives the date that becomes a paperwork problem. Here it is simply the right mental model: a gum is a suspension of swollen particles, and everything that follows depends on whether those particles were separated before they met water.
Each gum then asks for a different piece of the plant.
Guar hydrates cold and needs shear. Its practical constraint is mixing energy and time, not temperature. Fine grades trap air and hydrate on the outside first; coarse grades wet slowly; both behave better when they are introduced to a moving vortex instead of a still surface.
Xanthan hydrates cold, reads the soonest, and lumps the fastest of the three. It is the gum that most often arrives in a factory as a solved problem in the laboratory and an unsolved one at the tank inlet.
Locust bean gum needs a heat step: something in the region of 80–85 °C held for two to three minutes and then cooled. In practice that means a jacketed vessel or a pre-heater, a temperature probe that the operator trusts, and cooling capacity to get the batch back down. Where the process is a powder blend reconstituted with cold water, locust bean gum is not available to it at any dose, and the trial should not be scheduled.
Does the heat step buy anything once xanthan already works cold?
Sometimes. What locust bean gum contributes is a texture character rather than raw thickness: a soft, short, non-ropey body that reads as creamy in a chilled dessert base or a hot-held sauce, and the gel synergy described in section 5 when xanthan is present. What it costs is a heating and cooling cycle, tank occupancy, and one more parameter that has to be verified on the line. A plant without spare tank time should treat that as the real price of the gum, because it is the part that shows up in the schedule.
Identical powder, identical dose, one process step apart
Both jars hold the same dispersion of locust bean gum in water at the same dilution. The left jar was kept cold and stirred: its powder floats at the surface and lies on the bottom, and the water between them never thickened. The right jar was brought up to roughly 80–85 °C, held for a few minutes and allowed to cool, and is now a uniform body.
This is the step that decides whether locust bean gum is an option for a given plant. If nothing in the process reaches that temperature, the gum stays inert and leaves the finished product to do without it.
The dispersion discipline is shared, even though the failure modes are not. Dry-blend the gum with one of the dry ingredients from the same formula at roughly one part gum to five to ten parts dry solids, or make a cold oil slurry first. Feed it into a vortex rather than onto a still surface. Hold high shear for two to five minutes once all the powder is in. Add acid, colour, salt or alcohol after the gum has hydrated rather than before, because each of them changes how fast water reaches the particle. Then let the batch rest so entrained air can leave it.
What looks like the same defect behaves differently underneath. A xanthan lump has a dry core inside a gel skin and will not redisperse however long mixing continues; it is removed by screening or by dispensing better next time. Under-hydrated locust bean gum has no core at all; it is simply still inactive, which is why it passes through a hot-fill step unnoticed and then settles out of the finished product on the shelf. Guar lumps sit between the two: they soften eventually, which encourages staff to keep stirring rather than to fix the feed.
4. What the Liquid Does Back: Acid, Salt, Sugar, Alcohol
Choice of gum is half the question; the other half is what the matrix does to a hydrated gum over the months between filling and drinking.
Acidity. Guar works in a practical band of about pH 4.0 to 10.5. Below that the polymer hydrolyses, and the visible result is a product that measures acceptably at the start of storage and thins as storage continues. Time and temperature are part of the same mechanism, which is why the loss looks mild in a bench sample and serious in a hot-filled bottle held through a summer. Xanthan is the default for citrus drinks, coffee liquids and vinegar dressings because it does not behave that way across the pH range those products are sold in. Locust bean gum is not brought in for acid work.
A boundary that supplier documents disagree about. Several data sheets state that guar gum is stable at pH 3 or 4. That statement and the one above are both reproducible, because they are not measuring the same thing. A viscosity reading taken a few hours after preparation at ambient temperature shows a small loss; the same system held for a shelf-life period, or held warm, shows a large one. When a pH stability figure is quoted, the two questions that decide its meaning are how long the sample stood and at what temperature. It is worth applying the same test to an internal specification: a release method run on fresh solution will pass a product that later fails on a shelf.
Salt. Xanthan carries charge in solution, so dissolved salts change how its molecules coil and how thick the solution reads. Published work reports the effect in both directions depending on salt form and concentration, so there is no single rule to carry from a water trial into a soya-sauce base, an electrolyte drink or a mineral-rich plant water. The instruction that follows is procedural rather than numeric: dose the finished formula in the water actually used on site. For the two seed gums, ionic strength is not the primary variable in beverage work, which is one of the few clean asymmetries between the fermentation product and the two legume seeds.
Sugar and solids. A concentrated syrup is not water at the same nominal dose, because there is less free water available to swell the particles. Whatever number works in a bench beaker of water has to be re-derived in the syrup, and it is normal for a high-solids base to need proportionally less gum than the water trial suggests and to behave differently at the pour.
Alcohol. In high-abv bases, solubility rather than dose becomes the limit, and the order of addition shows it. Add the alcohol last, after the gum has hydrated in the water phase, and check the batch cold, since material that is still in solution warm can come out of it chilled.
Three checks that cost one shift, not one shelf-life study
- Measure pH at fill and again after a hold at the worst temperature the product will see. The gap between the two numbers is the acidity the gum has to survive, not the target pH on the specification sheet.
- Read viscosity on day zero and again after the same hold, on the same bottle rather than a parallel one, so that dispersion variation is not mistaken for storage behaviour.
- Photograph the same sealed container at each reading, upright against a fixed background. Sediment, creaming and syneresis are visible long before any of them appear in a viscosity figure.
5. Body, Suspension and Gel Are Three Different Purchases
Most selection mistakes come from buying one of these and expecting another. The three jobs have different mechanisms, different tests and different gums.
Body is what the drink resists with while it is being poured and swallowed. It is measured in motion, which is why a viscometer reading feels like an honest number and so often fails to predict the shelf. Both seed gums deliver body economically; xanthan delivers it too, and turns ropey and coating if the dose is pushed past the sensory point.
Suspension is what keeps a particle where it was filled. A sealed bottle on a warehouse rack is not moving, so the property that matters is the structure a gum leaves behind in still liquid. Xanthan leaves a great deal of it; guar and locust bean gum leave comparatively little, which is why the answer to a sediment problem is rarely more seed gum and more often xanthan, a finer grind on the solid, or both at a lower total gum load.
Gel is a set that holds its own shape, and none of the three produces one alone at use levels. The combination that does is xanthan with locust bean gum: heated together, cooled, and left standing, at equal parts the pair forms a soft gel that melts again on heating. Xanthan with guar is the most common blend in the cluster and it does something real to viscosity, but it stays a liquid. The usual explanation sits in side-chain density: guar carries galactose side branches roughly every second mannose unit on its backbone, locust bean gum roughly every fourth, and the smoother backbone of locust bean gum is what allows the two polymers to associate with each other where guar cannot.
The gel test that the specification already contains
21 CFR 172.695, the standard of identity for xanthan gum, includes a locust bean gum gel test as an identity criterion. It is also the clearest half-day demonstration of the synergy above, and a purchasing laboratory can run it without anything beyond a hot plate, a stirrer and a thermometer.
- Dry-blend 1.0 g of locust bean gum with 1.0 g of the gum under test.
- Add the blend slowly to 200 ml of purified water already at 80 °C, stirring at high speed for about half a minute as it goes in.
- Continue stirring for at least 30 minutes, keeping the temperature above 60 °C.
- Let it stand until cool, for at least two hours and below 40 °C.
Reading the result: a genuine xanthan sample sets the mixture into a firm, rubbery gel, while a one percent solution of the same xanthan without locust bean gum stays pourable. No set means one of three things: the sample is not xanthan, the locust bean gum was not properly hydrated, or the mixture was not held hot long enough. That is a diagnostic, not a pass or fail, and it is why the test belongs in a receiving procedure rather than in a brochure.
Why this test is worth running before a contract
The cylinder standing at the centre is the test mixture after heating and cooling: it kept the shape of the cup it was turned out of, and the cup is still in the gloved hand at the left. The sample on the right is xanthan alone at the same concentration; its cup was tipped over and it ran out flat.
The test confirms identity and it confirms that the locust bean gum was hydrated. It says nothing about viscosity grade, substitution or purity, and it should not be asked to carry those conclusions.
For the two seed gums the useful identity question is different, and cheaper than an instrument. Guar and locust bean gum are both galactomannans from legume seeds, but their side-chain ratio differs, roughly two to one against roughly four to one. That difference is measurable by sugar analysis and it is also visible in the cold-water behaviour described above: a sample sold as locust bean gum that thickens a cold dispersion promptly is a signal about what is actually in the bag.
6. Why Do Published Freeze-and-Thaw Answers Contradict Each Other?
Ask which of the three gums best protects a product from freeze-thaw damage and the sources do not agree. A widely circulated industry handbook on hydrocolloids singles out locust bean gum as particularly suited to freeze-thaw systems. Work on rice starch systems reports guar performing better than locust bean gum. Work on fat-and-protein systems reports xanthan ahead of locust bean gum. At least one supplier page states flatly that locust bean gum is worse than guar on freeze-thaw. All of these can be found, and a buyer who treats any one of them as a specification will be surprised.
The disagreement is not sloppy reporting. Damage on thawing is water that has been squeezed out of a network, and the network belongs to the whole system: starch, protein, fat globules, ice-crystal size, how fast the product was frozen, how many cycles it saw. A gum changes that network; it does not own it. Locust bean gum is the clearest case, because it gels poorly alone and does real work when it can associate with a second polymer. In a system that gives it nothing to co-gel with, it can look like the weakest of the three; in a dessert mix where it co-gels with xanthan, it is often the reason the product does not weep.
So the defensible position is a method rather than a ranking. Take one batch, not parallel batches, and cycle it at -18 °C with a controlled thaw. After each cycle photograph the surface and measure free liquid, and record the cycle number at which serum first becomes visible to the eye in the serving vessel. Then check the opposite failure on the same samples, because a gum can hold the water and still give a gummy or fatty mouthfeel that a panel rejects before a chemist ever sees the serum line. Freeze-thaw also matters more than specification sheets suggest: domestic freezers, a broken cold chain and retail handling all apply cycles that no stability plan asked for.
One consequence for the way gum is bought. If a supplier answer on freeze-thaw is not expressed as a system, a dose and a number of cycles, it is an opinion rather than data, and it should not be copied into a specification. The same rule protects the other side of the transaction: a customer complaint about weeping is a question about the whole formula, and the fastest way to answer it is the cycle test above rather than an argument about the drum.
7. How Should the Three Be Compared on Cost Without a Price List?
Price per kilogram is the least informative number in a gum comparison, for a simple reason: the three gums do not do the same amount of work per kilogram in the same product, and the dose that meets a target is a property of the formula rather than of the market. The comparison below is written so that it can be run with the quotation closed.
- Write the acceptance target before any trial starts: viscosity at a stated shear rate and temperature, maximum sediment height, maximum free liquid after a stated number of cycles, pour time. A target written afterwards will be met by whichever gum was cheapest.
- Run a control plus three dose levels of each candidate, in the actual base, in the plant water, with the same dispersion sequence and the same order of addition.
- Record the lowest dose that meets the target. That dose, not the price, is the technical result, and it is the number the two are multiplied by.
- Add the process terms that never appear on a quotation: whether a jacketed heat step has to be scheduled and what that displaces; what one reworked batch costs in screening, discarded product and changed filter bags; what a product that will not pass through the filler at the target viscosity costs in line speed.
- Price the risk at the end of shelf life. Sediment and serum are visible to a consumer and are returned or written down as a whole pallet rather than as a fraction of a drum.
Run this way, the ranking of the three gums can invert between two factories making nominally the same product. A site with spare jacketed tank capacity and a chilled dessert line has a different cost structure from a site that reconstitutes powders cold and has never owned a heater. This is also the point at which a blend usually enters the conversation: a small amount of xanthan bought for rest structure, carried by a larger amount of a seed gum bought for body, is a common outcome of the dose test above, and it would not be found by reading price lists side by side.
One arithmetic habit is worth keeping. Compare candidate gums at the dose that met the target, and quote the result as cost per litre or per kilogram of finished product. Two suppliers can send identical certificates and produce different numbers in a factory, and only the finished-product basis will show it.
8. When None of the Three Is the Right Answer
A selection guide is worth less if it pretends the shelf ends at three products. These five situations are where the conversation should move on.
| Situation | Why the three fall short | What the decision becomes |
|---|---|---|
| Bright, clear beverage | All three are colloidal dispersions and all three add haze; locust bean gum adds least, which is not the same as adding none | A clarity budget first, then a gum family chosen against it, then a filtration step that can survive the chosen gum |
| A firm gel: confectionery, set dessert, sliceable product | None gels alone, and the xanthan with locust bean gum set is soft and melts on reheating | Gelling gums are the category to evaluate; these two remain useful as the water-holding component of a blend |
| Heavy particle load, long ambient shelf life | Rest structure has a practical ceiling; the dose needed to hold coarse material by gum alone reaches a texture the consumer rejects | Grind finer, reduce particle density, or accept a shake-before-drinking instruction; then re-run the dose test at a lower gum load |
| High-alcohol base | Solubility, not dose, becomes the limiting factor once alcohol is in the continuous phase | Hydrate in the water phase, add alcohol last, and trial the finished product cold rather than at mixing temperature |
| A short ingredient list is the commercial requirement | In the European Union all three are declared as stabilisers and carry E numbers, so none of them is a clean-label ingredient | Decide the label position first and the gum second; a formulation that satisfies both is usually simpler than one that tries to |
9. Paperwork: The January 2026 European Changes, and What to Ask a Supplier For
All three gums are authorised food additives in the European Union under Regulation (EC) No 1333/2008, with specifications in Commission Regulation (EU) No 231/2012. In the United States xanthan gum is defined by 21 CFR 172.695, quoted throughout this article because its test methods are the ones a receiving laboratory can actually reproduce. Being listed in a regulation is not the same thing as a product being approved, and a supplier statement that confuses the two is worth noticing.
On 28 January 2026 the Commission adopted Regulation (EU) 2026/196, published in the Official Journal on 29 January 2026 and applying from 18 August 2026. It amends the conditions of use of locust bean gum, guar gum and xanthan gum, alongside gum arabic, pectins, carrageenan and starch sodium octenyl succinate, and it rewrites the specifications for the same group. Four consequences touch the products in this comparison.
| What Regulation (EU) 2026/196 changes | What to ask the supplier to put in writing |
|---|---|
| Toxic-element limits in the specification are reduced and microbiological criteria are added: lead at 0.4 mg/kg for locust bean gum, 0.2 mg/kg for guar gum and 0.5 mg/kg for xanthan gum, with arsenic at 0.1 mg/kg for all three | A certificate that names the limit each result is judged against, and the method used. A panel reported without a stated limit is not evidence of compliance with anything |
| The wording of the specification changes: soluble becomes fully dispersible for locust bean gum, and solution and soluble become dispersion and dispersible for guar gum | A technical sheet that describes how the gum disperses, at what temperature and with what shear, rather than one that claims it dissolves |
| The authorisation for guar gum in infant formula and in foods for special medical purposes for infants is withdrawn, with the category for older infants and young children aligned to 27 April 2027 | Written confirmation of which of those categories the offered lot is intended for, and a reformulation path if the target market includes them |
| In milk-based drinks and similar products intended for young children, locust bean gum, guar gum and xanthan gum each carry 10,000 mg/kg, and a new footnote applies those maxima jointly: where more than one of the listed gums is present, each maximum is reduced by the share taken by the others | An additive plan expressed as a sum across gums, not as separate per-gum checks. A blend can exceed a ceiling that each component appears to respect |
| Stock placed on the market before 18 August 2026 may be used until it is exhausted, and foods made with it may be marketed until their minimum durability date | A packing date on every drum. Compliance in this case is a date on a bag, not a paragraph in an email |
Two of these rows are frequently missed in purchasing. The joint maximum in the young-children category is invisible to a specification that lists one gum per line, and it changes what a blend may contain. And a certificate of analysis that reports heavy metals without stating the limit it was judged against cannot be compared with a competitor's, which is the only use most buyers have for those rows.
Three further documents are worth asking for on any seed gum, whatever the market. Ethylene oxide is the recurring reason consignments of these gums are refused at European borders, so a declaration that none has been applied, supported by a per-lot headspace GC-MS report at the limit of quantification, is more useful than a general statement of compliance. Microbiological results should be reported against the release limits actually applied by the supplier, which are usually stricter than the commodity norm. And the botanical source should be stated plainly: guar gum comes from the endosperm of guar seed and locust bean gum from the endosperm of carob seed, both from leguminous plants, while xanthan gum is a fermentation product recovered and milled. None of the three appears on the European Union list of allergens that require mandatory declaration, and the three are not offered here as organic ingredients. Whether a finished retail item needs an advisory statement is a determination for the brand owner against the rules of its own market, not something an ingredient supplier can decide by declaration.
All three gums in this comparison are stocked under one technical program, with xanthan produced on an accredited partner fermentation line and screened, blended and released here. Stocking all three is the reason the table above can state what each gum does poorly as well as what it does well; a single-gum supplier has an obvious incentive to describe the same variables differently.
10. Questions That Decide the Trial
Q1: Which of the three gums should be trialled first?
A: Trial xanthan first when there is no cook step, when the finished product sits below pH 4, or when solid particles have to stay suspended through distribution. Trial guar first when the target is body in a cold, near-neutral process. Trial locust bean gum first when a product is heated and then cooled and a soft set is wanted. Where two of those conditions apply at once, the answer is usually a blend rather than a single gum, and the blend ratio is set by the dose test rather than by a chart.
Q2: Does locust bean gum work in cold water?
A: It disperses rather than develops. Viscosity stays close to that of the water it is in until the dispersion is heated to roughly 80 to 85 degrees C, held for two to three minutes and then cooled. A cold tank with locust bean gum in it reads almost like water on a viscometer, and the inactive gum settles out of the finished product later. That single fact removes it from most cold-batch ready-to-drink processes and puts it back into dessert bases, hot-held sauces and chilled soft gels.
Q3: Can guar gum replace xanthan gum in a dressing, one for one?
A: Not without repeating the dose trial. The two gums do not build viscosity at the same rate, so an equal-weight swap changes texture even when both are the same mesh. Acidity is the larger issue: guar is practical around pH 4 and above and loses thickness progressively through storage below it, while xanthan is used in dressings precisely because it does not. A vinegar dressing moved from xanthan to guar can look correct on the first day and thin across the storage period, which is a shelf-life failure rather than a batch failure.
Q4: Why do suppliers disagree about which gum survives freezing and thawing?
A: Because the published results are not measuring the same product. A trade handbook singles out locust bean gum for freeze-thaw work, starch-system studies report guar ahead of it, fat-and-protein studies report xanthan ahead of it, and at least one supplier page states that locust bean gum performs worse than guar. All of those can be reproduced, because thaw damage is water leaving a network and the network belongs to the whole formula. Locust bean gum earns its place by co-gelling with a second gum, so it looks strong in systems that offer it a partner and weak in systems that do not. The number that settles the question is free liquid after a counted number of cycles at minus 18 degrees C in the actual base.
Q5: Which of the three keeps particles suspended the longest?
A: Xanthan, for a reason a viscometer conceals. Viscosity is measured while liquid is moving, and a bottle on a shelf is not moving. Xanthan leaves structure in still liquid, which is what resists settling, while guar and locust bean gum contribute thickness mainly when the product is poured or drunk. Putting more seed gum into a formula to fix sediment usually costs mouthfeel before it fixes the shelf, and reducing the size of the particles often achieves more than a higher dose of either gum.
Q6: How should the three be compared on cost when a quotation is per kilogram?
A: Price per kilogram is the least useful figure in the comparison, because the three gums do not perform the same amount of work per kilogram in the same product. Fix one acceptance target, run a control plus three dose levels of each candidate in the actual base and in plant water, and record the lowest dose that meets the target. Cost in use is that dose multiplied by the price of that gum, then added to the process terms that never appear on a quotation: whether a heat step has to be scheduled, what a reworked or discarded batch costs, and what sediment or serum at the end of shelf life returns as written-down stock.
Request the Three-Gum Trial Pack
Send the application, the measured pH at fill, the particle load if there is one, and the texture being aimed at. The reply states which of the three to trial, the dose ladder to run, and what to measure at each step, with the lot certificate attached. Sample sizes of 100–500 g are available free of charge for evaluation.
Technical enquiries: info@haoze-bio.com
Talk to the Technical TeamReferences and Standards Cited
- Commission Regulation (EU) 2026/196 of 28 January 2026, Official Journal L, 29.1.2026: amending Regulation (EC) No 1333/2008 as regards the use of locust bean gum (E 410), guar gum (E 412), xanthan gum (E 415) and related hydrocolloids, and amending Regulation (EU) No 231/2012 as regards their specifications; transitional measures in Article 3. https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32026R0196
- U.S. Food and Drug Administration, 21 CFR 172.695, Xanthan gum: statutory viscosity method, heat ratio, solvent residue, pyruvate criterion and the locust bean gum gel test. https://www.law.cornell.edu/cfr/text/21/172.695
- Regulation (EC) No 1333/2008 on food additives, Annex II Part E, and Commission Regulation (EU) No 231/2012 laying down specifications for food additives.
- European Food Safety Authority scientific opinions on the re-evaluation of locust bean gum (E 410), 20 January 2017, and on guar gum (E 412), 21 March 2024, as cited in the recitals of Regulation (EU) 2026/196.
- Whitcomb, D. and Macosko, C. W., Rheology of Xanthan Gum (1978), on the effect of salt form and concentration; and subsequent literature on xanthan intrinsic viscosity at higher ionic strength.
- Regulation (EC) No 396/2005 on maximum pesticide residue levels, as applied to ethylene oxide at the limit of quantification.
- Industry editorial compilations on hydrocolloid functionality, including freeze-thaw guidance for locust bean gum, consulted for the contradictory statements recorded in section 6.