Carob Gum vs. Xanthan and Guar Gum
Three of the most well-known hydrocolloids used in the food industry for consistency, stability and texture control are carob gum (E410), guar gum (E412) and xanthan gum (E415). The first two are galactomannans obtained from the endosperm of plant seeds; xanthan is a polysaccharide produced by microbial fermentation. Although these three gums are often mentioned side by side in the same product group, their chemical structures, behavior in water and interactions with each other are markedly different.
In this paper, we compare the three gums in terms of structure, solubility, thickening power, gel-forming tendency, and especially the known synergy between locust bean gum and xanthanum; we explain which property is important in formulation selection and why.
Brief Definition of the Three Scales
Hydrocolloids are large molecule substances that form viscosity by interacting with water and form a gel under some conditions. They are mostly used in low proportions in the food industry; the purpose is to adjust the consistency of a product, delay phase separation, limit ice crystal formation, or regulate mouthfeel.
Carob gum (locust bean gum, carob bean gum, E410)is obtained by grinding the endosperm part of the carob (Ceratonia siliqua) kernel. In the European Food Safety Authority (EFSA) evaluation, it is stated that E410 is a food additive authorized in the EU, obtained from the ground endosperm of carob seeds. Chemically, it is a galactomannan.
Guar scale (E412)is another galactomannan obtained from the seed endosperm of the guar plant (Cyamopsis tetragonoloba). A recent review on galactomannans reports that guar seeds can contain up to 40–50 percent galactomannans by weight.
Xanthan gum (E415) It is an exopolysaccharide produced by bacterial fermentation, not from plant seeds. Therefore, it differs from the other two in terms of its origin, structure and behavior. In EFSA's 2017 re-evaluation, it is stated that xantha is not expected to be absorbed intact in the intestine, but is fermented by the intestinal microbiota.
Chemical Structure: Mannose Backbone and Galactose Branches
What puts the carob gum and guar gum in the same family is their common skeleton. Galactomannans have a linear main chain of D-mannose units linked together by β-1,4 bonds and D-galactose side branches attached to this chain by 1,6 bonds. The most important difference that distinguishes the two scales is that the galactose branches on the main chain frequency and distribution.
In the literature, this difference is often expressed in the mannose/galactose (M/G) ratio. In a 2025 review by Flores García et al., the M/G ratio for the carob gum is given as approximately 4:1 and for the guar gum as approximately 2:1. In the study by Goycoolea et al. on xanthan synergy, these ratios are referred to as approximately 3.5 for the carob gum and approximately 1.55 for the guar. Although the figures vary depending on the sources and raw material, the direction is the same: galactose branches are sparse in the carob gum and denser in the guar gum.
The distribution of branches is also important. In the same review, it is stated that galactose branches are more evenly distributed in the guar gum, which provides a more stable and reproducible viscosity; in the carob gum, it is stated that the irregular distribution allows for stronger synergy with other gelling agents. The "smooth" mannose blocks that remain unbranched in the main chain of the carob gum are considered as regions that can establish physical connections with other polysaccharides.
The structure of xantha, on the other hand, is completely different: trisaccharide side chains are attached to a backbone of glucose units; the side chains contain mannose and glucuronic acid, with some units replaced by acetyl and pyruvate groups. These charged groups give xanthhane an anionic character; galactomannans are neutral polysaccharides.
Water Solubility and Hydration Differences
In galactomannans, galactose branches prevent the main chains from getting too close to each other and forming crystal-like regions, facilitating the interaction of the molecule with water. According to the compilation by Flores García et al., the solubility of galactomannans in water is related to the proportion of galactose side chains in the structure; as the galactose branch decreases, the hydrogen bonds between the chains increase and the solubility decreases.
This structural difference is reflected in practice as follows:
| Guar scale | Since galactose branches are dense, it can be dispersed in cold water; in the same review, it is emphasized that the dispersibility of guar in cold water is an important advantage in industrial applications. |
| Carob gamut | Due to its sparser branched structure, it is often used in combination with heat treatment in application for complete hydration; therefore, it is preferred in products involving pasteurization or cooking steps. |
| Xanthan gum | It is known as a gum that is soluble in both cold and hot water and can maintain its viscosity over a wide range of pH and temperature. |
These differences directly affect the choice of gamut according to the production flow of the formulation. A cold prepared sauce and a heat-treated ice cream mix should not expect the same performance from the same gamut.
Thickening and Gel-Forming Power
Thickening capacity depends not only on the galactose ratio, but also on molecular weight and chain length. The compilation by Flores García et al. gives the thickening capacity among galactomannans in the order of fenugreek gum, guar gum, tara gum and carob gum; that is, when used alone, guar tends to form higher viscosity than carob gum.
In the tendency to form gels, the order is reversed. Galactomannans, which have fewer galactose branches than the same source, interact more strongly with other polysaccharides thanks to unbranched mannose blocks and form stronger gels in combinations. In this ranking, the carob gum is the strongest and the guar gum has a weaker gelling capacity; guar gives more viscous solutions, but its gelling capacity is limited.
In summary:
| Feature | Carob gamut (E410) | Guar scale (E412) | Xanthan gum (E415) |
|---|---|---|---|
| Source | Carob seed endosperm | Guar seed endosperm | Bacterial fermentation |
| Chemical type | Neutral galactomannan | Neutral galactomannan | Anionic exopolysaccharide |
| M/G ratio | Approx. 3.5–4:1 | Approx. 1.5–2:1 | Not applicable |
| Behavior in cold water | Limited; usually used by heating | Dispersible | Soluble |
| Thickening alone | Medium | High | High, shear-thinning structure |
| Synergy potential | Forms strong gel with xanthan | Viscosity increase with xantane, poor gelation | Interacts with galactomannans |
The qualitative statements in the table are based on the general findings of the reviews and researches whose sources are given below; the exact values for a particular product should be determined by the technical specification of the range used and laboratory measurements.
The Synergy Between Xanthan and Carob Gum
One of the most studied topics in hydrocolloid science is the synergy that occurs when xanthan gum and carob gum are used together. These two polysaccharides, which do not gel separately or make weak gels, can form an elastic gel when heated and cooled together.
In Fernandes' 1995 study, xantane; guar was examined by mixing it with the carob gum, which was divided into the whole carob gum and fractions. In the study, it was reported that the strongest synergy was obtained in a 1:1 ratio of xanthan and galactormannan, the M/G ratio of the carob scale fractions determined the gelation and melting temperatures, and the fractions with a high M/G ratio showed higher transition temperature with stronger synergy.
The study of Goycoolea et al. supports a similar picture: It is stated that mixtures of carob gum and xanthan form a gel at about 60 °C, and that synergy with xanthan tends to increase as galactose content decreases. In 2015, Grisel et al. examined the effect of the fine structure of galactomannans on the interaction of xanthan and proposed two mechanisms that work together to explain the synergy.
These findings mean in practice that:
- The combination of xanthan + carob gum can be considered in formulations that want to establish gel-like structure with a low total amount of gamut.
- The combination of xanthan + guar provides more viscosity increase; it is not expected to form a gel to the same extent.
- The mixing ratio and the M/G ratio of galactomannan significantly affect the hardness and temperature behavior of the resulting structure.
Which Gum Is Chosen For What In Food Applications?
Scale selection is not a single "best gamut" question; the way the product is processed, shelf life expectancy, target texture and cost are evaluated together.
Heat-treated dairy and ice cream mixesare the traditional uses of carob gum. The heat treatment step facilitates the hydration of the gum; combinations with other stabilizers are used to adjust tissue and melting behavior. In a study conducted in Turkey, 0.05, 0.10 and 0.20 percent carob gum was added to kefir produced from goat's milk; it was reported that as the gum ratio increased, the viscosity increased and serum separation decreased, and the panelists preferred samples containing 0.05 and 0.10 percent gum to control. This result shows that even at low rates, it can significantly affect the tissue; excessive use can reduce taste.
Sauces, drinks and ready-to-mix prepared cold may be more practical in products such as guar gum or xantane, which can disperse in cold water. The slid-thinning (pseudoplastic) structure of xanthan supports desirable properties such as sauces flowing easily from the bottle but staying thick on the plate.
In desserts, fillings and some ready-to-eat foods that require a gel-like structure The combined use of xanthan and carob gum can make it possible to reach the target tissue with a lower total scale amount thanks to synergy.
Differences are also seen in non-food areas. For example, in the review, it is stated that guar gum is the most commonly used thickener in textile printing pastes due to its dispersibility in cold water, while carob gum can be used in alkali-resistant printing pastes in a wide pH range thanks to its non-ionic structure.
Security Assessments and Legislation
All three batches are food additives authorized in the European Union with the E number and were re-evaluated by EFSA in 2017.
According to EFSA's carob scale assessment, E410 is virtually never digested, is not absorbed intact, and is significantly fermented by bacteria in the human gut. It was reminded that JECFA set an "not specified" acceptable daily intake value in 1981; The EFSA panel also concluded that there is no need for a numerical acceptable daily intake value and that there are no safety concerns for the general population in the reported uses. In the same assessment, it was stated that infants and young children fed foods for special medical purposes may be more susceptible to digestive system effects due to their underlying conditions and that data for this group are insufficient.
For the xanthan gum, EFSA concluded that there is no need for a numerical acceptable daily intake value and that there are no safety concerns at refined exposure levels for the general population; it is also included in the evaluation that at high doses in adults, abdominal discomfort may be seen in some individuals, which the panel described as an undesirable but non-adverse effect. The Guar gum was also re-evaluated by the same panel with a separate opinion.
These evaluations form the scientific background of the legislation that determines in which products and in what quantities the gums can be used. Which gum can be used in a manufacturer's own product and in what proportion should be checked separately according to the applicable additive legislation.
Frequently Asked Questions
Are locust bean gum and guar gum interchangeable? Since both gamuts are galactomannan, they are partially interchangeable in some applications; however, because their solubility, viscosity, and gel-forming behavior, especially with xanthan, are different, a direct one-to-one change often does not produce the same result. Formulation experimentation is required.
Is xanthan gum vegetable? Xanthan is a polysaccharide produced by bacterial fermentation, not from plant seed. Carob and guar gum, on the other hand, are obtained directly from the endosperm of plant seeds.
Why use xanthan and carob gum together? When these two polysaccharides are heated and cooled together, they can form an elastic gel structure that they cannot form alone. Research shows that synergy depends on the mixing ratio and the mannose/galactose ratio of the carob gamut.
Is carob gum the same as carob flour? Carob gum is obtained from the endosperm of the kernel, while carob flour is obtained from the fleshy part (pulp) of the fruit; their functions and compositions are different.
Carob Kernel and Raw Material Supply with Carob Türkiye
The raw material of carob gum is the kernels separated from the carob fruit. In the production of gum, the shell of the kernel is separated, the endosperm section is separated from the germ and ground; therefore, the supply of clean, classified and traceable kernels is the first link in the chain.
At Carob Türkiye, we supply carob fruit, crumbs, flour/powder, kernels, and extracts. For more information on the structure and commercial value of the kernel What is Carob Seed? For product specifications, Carob Seed You can review our page. For your wholesale and export requests Contact Now You can contact us on our page.
Domestic resources
Sarıca, E., Filizkıran, G., Canbek, D., Ertürk, B., Coşkun, M., Mustuloğlu, Ş., "The Effect of Carob Gum on the Physicochemical and Sensory Properties of Kefir Produced from Goat Milk", Akademik Gıda, 2021, 19(1), 28–37. dergipark.
org. en/ en/ pub/ academic- food/ article/ 927653 Foreign sources
EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS), Mortensen, A., Aguilar, F., Crebelli, R. et al., "Re-evaluation of locust bean gum (E 410) as a food additive", EFSA Journal, 2017, 15(1), 4646. doi.
org/ 10. 2903/ j. efsa. 2017. 4646 EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS), Mortensen, A., Aguilar, F., Crebelli, R. et al., "Re-evaluation of guar gum (E 412) as a food additive", EFSA Journal, 2017, 15(2), 4669. doi.
org/ 10. 2903/ j. efsa. 2017. 4669 EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS), Mortensen, A., Aguilar, F., Crebelli, R. et al., "Re-evaluation of xanthan gum (E 415) as a food additive", EFSA Journal, 2017, 15(7), 4909. doi.
org/ 10. 2903/ j. efsa. 2017. 4909 Flores García, Y., Martín del Campo Solís, M. F., Gómez-Angulo, J. H. et al., "Industrial Applications, Principal Sources, and Extraction of Galactomannans: A Review", Foods, 2025, 14(9), 1587. doi.
org/ 10. 3390/ foods14091587 Fernandes, P. B., "Influence of galactomannan on the structure and thermal behaviour of xanthan/galactomannan mixtures", Journal of Food Engineering, 1995, 24(2), 269–283. doi.
org/ 10. 1016/ 0260- 8774(94)P2647- N Goycoolea, F. M., Richardson, R. K., Morris, E. R., Gidley, M. J., "Stoichiometry and conformation of xanthan in synergistic gelation with locust bean gum or konjac", 1995 (Universidad de Murcia DIGITUM repository). digitum.
um. es/ Digitum/ bitstream/ 10201/ 139110/ 4/ Free%20sto... Grisel, M., Aguni, Y., Renou, F., Malhiac, C., "Impact of fine structure of galactomannans on their interactions with xanthan: Two co-existing mechanisms to explain the synergy", Food Hydrocolloids, 2015, 51, 449–458. doi.
Scientific Resourcesorg/ 10. 1016/ j. foodhyd. 2015. 05. 041
