Beta-glucans are natural polysaccharides found in numerous plant, fungal, and bacterial sources. Known for their beneficial effects on health, they are generating increasing interest in the food, nutraceutical , and cosmetic. Their role extends far beyond their biochemical structure: these molecules influence metabolism, modulate the immune system, and participate in cholesterol regulation. To ensure the quality and efficacy of products containing them, it is essential to analyze them in the laboratory using appropriate methods. This article explores in detail their composition, their benefits, and the analytical techniques used for their quantification.
YesWeLab offers a full range of analytical services, combining scientific expertise and cutting-edge technologies to optimize the quality and safety of your formulations.
Table of Contents
What are beta-glucans?
Scientific definition and molecular structure
Beta-glucans are polysaccharides composed exclusively of D-glucose molecules linked together by beta glycosidic bonds. These bonds can be β(1→3), β(1→4), or β(1→6), depending on the origin of the beta-glucan and its specific structure. Unlike alpha-glucans, such as starch and glycogen, beta-glucans form more rigid structures that influence their biological and functional properties.
The configuration of the bonds is a determining factor in their physiological effects. For example, beta-(1→3),(1→6)-glucans, present in fungi and yeasts, have demonstrated significant immunomodulatory activity, while beta-(1→4)-glucans, predominantly present in oats and barley, are particularly effective in reducing blood cholesterol.
Differences compared to other polysaccharides
Beta-glucans belong to the large family of glucans, which also includes polysaccharides such as starch, cellulose, and glycogen. However, their unique chemical structure gives them particular properties:
- Difference from cellulose : although cellulose is also a glucose polymer linked by beta-(1→4) bonds, it is not classified as a beta-glucan due to its lack of branching and low water solubility. In contrast, some beta-glucans, particularly those derived from cereals, are soluble and form gels.
- Difference with alpha-glucans : Alpha-glucans (e.g., starch, glycogen) possess α(1→4) and α(1→6), making them more easily digested by human enzymes. Beta-glucans, on the other hand, are not broken down by typical digestive enzymes and thus exert their effects as dietary fiber or immunostimulants.
Origins and natural sources
Beta-glucans are found in several natural sources, some of which are widely used in the food and nutraceutical industries.
- Cereals : Oats and barley are the main sources of dietary beta-glucans. Their particular structure gives them gelling properties and a beneficial effect on lipid metabolism.
- Mushrooms : the beta-glucans of mushrooms (shiitake, reishi, oyster mushroom) are being studied for their immunostimulating and antitumor effects.
- Yeasts : Beta-glucans from baker's yeast (Saccharomyces cerevisiae) are widely used in the pharmaceutical industry to boost immunity.
- Microalgae and bacteria : some species of microorganisms produce beta-glucans with specific properties, although their industrial exploitation is still limited.
Physicochemical properties and mechanisms of action
Beta-glucans are soluble or insoluble fibers, depending on their structure. Their ability to form viscous gels in the intestine is one of the key mechanisms explaining their effect on cholesterol reduction and blood sugar regulation. By interacting with receptors of the immune system, they also stimulate the production of cytokines, thus activating immune cells responsible for the body's defense.
The molecular weight of beta-glucans influences their biological activity:
- High molecular weight → more pronounced effect on blood sugar regulation and cholesterol reduction.
- Low molecular weight → better absorption and faster immunomodulatory effect.
Beta-glucans therefore play a key role in various metabolic and immune processes, which explains their growing interest in the formulation of food supplements and functional products.
What are the benefits of β-glucans?
Beta-glucans are the subject of much research for their potential health effects. However, it is essential to distinguish between effects that have been scientifically validated and authorized by health authorities and those that are still under investigation. In Europe, the framework for health claims is strictly regulated by Regulation (EC) No 1924/2006: only certain claims relating to beta-glucans have been approved by the European Food Safety Authority (EFSA).
Effects on the immune system
Beta-glucans are known for their ability to modulate immunity, making them key molecules in the prevention and treatment of various infections.
- Stimulation of immune cells : Beta-glucans activate specific receptors on macrophages, dendritic cells, and neutrophils. This activation leads to an increase in the production of cytokines, molecules that coordinate the immune response.
- Strengthening natural defenses : By activating white blood cells, they help the body to better defend itself against bacterial, viral and fungal infections.
- Anti-inflammatory effect : Some beta-glucans reduce the production of pro-inflammatory cytokines, which may alleviate the symptoms of autoimmune and chronic inflammatory diseases.
- Application in oncology : Studies have shown that beta-glucans can stimulate NK (natural killer) lymphocytes, cells specialized in eliminating cancer cells. This property is being studied in adjuvant treatments for certain cancers.
Cholesterol reduction: the main validated claim
The best-documented effect is the cholesterol-lowering action of beta-glucans from oats and barley. The EFSA has recognized a causal relationship between consuming at least 3 g of oat beta-glucans per day and a reduction in blood cholesterol (LDL and total). To make this claim, a product must provide at least 1 g of beta-glucans per quantified serving.
Several mechanisms explain this effect:
- Formation of a viscous gel in the intestine: this gel traps bile acids and reduces the absorption of dietary cholesterol.
- Increased cholesterol excretion: the liver mobilizes more cholesterol to produce new bile acids, which helps lower LDL levels.
Meta-analyses of randomized controlled trials confirm this benefit, with an average reduction in LDL cholesterol of approximately 0.25 to 0.3 mmol/L for an intake of about 3 g per day.
Regulation of postprandial blood glucose
Oat beta-glucans are also the subject of a claim regarding the reduction of post-meal blood sugar spikes, linked to their viscosity which slows carbohydrate absorption. This effect is contingent upon a precise ratio of beta-glucans to the product's digestible carbohydrates.
Gut health and prebiotic effect
Other properties of beta-glucans are the subject of active research, but to date, no health claims are authorized in Europe. The results remain preliminary and should be interpreted with caution
- Immune system modulation: studies suggest that certain beta-glucans (particularly those from yeast and fungi) interact with receptors on immune cells. This research is still being validated.
- Antioxidant and anti-inflammatory effects: research is exploring their ability to limit oxidative stress, although no clinical effect has yet been established.
- Prebiotic effect: as fibers, beta-glucans could favorably influence the intestinal microbiota, a lead that still needs confirmation.
Antioxidant and anti-inflammatory properties
Beta-glucans are also being studied for their antioxidant, which helps reduce oxidative stress responsible for cellular aging and many chronic diseases.
- Neutralization of free radicals : Their structure allows them to interact with reactive oxygen species (ROS), thus limiting damage to cells and tissues.
- Protective effect on the liver : Some studies suggest that beta-glucans may play a role in liver detoxification, particularly by reducing the accumulation of lipids in the liver.
- Action on inflammatory diseases : Their interaction with the immune system could reduce chronic inflammation, a factor involved in pathologies such as arthritis, cardiovascular diseases and metabolic disorders.
Beta-glucans: challenges and risks for manufacturers
Incorporating beta-glucans into a formulation represents a real commercial opportunity, but exposes manufacturers to several regulatory and quality risks that need to be controlled upstream.
Labeling compliance
The beta-glucan content stated on the label must correspond to the actual content of the product. A discrepancy between the two constitutes non-compliance, exposes the product to penalties, and undermines consumer confidence. Independent laboratory analysis ensures the accuracy of this information.
Compliance with the health claims framework
Only claims approved by the EFSA (cholesterol reduction, postprandial blood glucose, under specific dosage conditions) may appear on a product. Any unauthorized claim—particularly regarding immunity or therapeutic effects—exposes the manufacturer to penalties and product recall. Compliance with minimum thresholds (e.g., 1 g per serving for the cholesterol claim) must be demonstrated by reliable quantification.
Purity and absence of contaminants
Depending on their origin (cereals, yeasts, fungi), beta-glucan extracts may contain other polysaccharides (cellulose, starch) that can skew the dosage, or contaminants from the extraction processes (microbial residues, mycotoxins). Purity control is essential, particularly for dietary supplements and pharmaceutical formulations.
Stability in the final formulation
Beta-glucans can change during storage or interact with other ingredients, which can affect the actual content and effectiveness of the finished product. Stability tests help anticipate these risks.
Faced with these challenges, the use of rigorous analytical control is not a mere formality: it is a lever for regulatory compliance and an argument for building trust with customers and distributors.
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Laboratory analyses of beta-glucans
Laboratory analysis of beta-glucans is essential to guarantee their quality, concentration, and compliance with regulatory standards. These analyses allow manufacturers to validate their formulations, ensure product efficacy, and prevent contamination or fraud. The analytical techniques used must be adapted to the different matrices, whether they are dietary supplements, cosmetic products, or foods enriched with beta-glucans.
To explore complementary methods, particularly in the context of polysaccharide quantification, see our article on laboratory analysis of galacturonic acid.
Why analyze beta-glucans in the laboratory?
Beta-glucans are used in various industrial sectors, including food processing, nutraceuticals, and cosmetics. To guarantee their effectiveness and compliance, several parameters must be evaluated in the laboratory:
- Determination of beta-glucan concentration : Ensure that the levels present correspond to the manufacturers' claims.
- Purity verification : Identify the possible presence of other polysaccharides, such as cellulose or starch, which could skew the results.
- Contaminant control : Detection of microbial residues, mycotoxins or impurities from extraction processes.
- Validation of health claims : EFSA and FDA impose precise thresholds for products to be able to claim specific health benefits.
The analysis of these parameters guarantees the quality of raw materials and finished products while ensuring their compliance with ISO 17025 standards and COFRAC certifications for the European market.
Analytical techniques used for the analysis of beta-glucans
The analysis of beta-glucans relies on several laboratory techniques. These methods allow for the quantification of their concentration, the characterization of their structure, and the verification of their compliance with current regulations.
High-performance liquid chromatography (HPLC)
High-performance liquid chromatography (HPLC) is a reference method for the analysis of polysaccharides. It allows for the separation and identification of beta-glucans present in a sample.
- Principle : The sample is dissolved, filtered, and injected into a chromatographic column. Depending on their structure, the beta-glucans migrate at different speeds and are detected by a UV spectrophotometer or a mass spectrometer.
- Benefits :
- High precision and reproducibility.
- Ability to differentiate between types of beta-glucans (beta-(1→3),(1→6) and beta-(1→4)).
- Ability to detect impurities and additives.
Applications : Essential for nutraceutical products and food supplements, this method ensures that the beta-glucan levels advertised on labels correspond to reality.
Enzymatic method
The enzymatic method is specifically developed to quantify beta-glucans in food and pharmaceutical matrices.
- Principle : Beta-glucans are hydrolyzed by specific enzymes (e.g., β-glucanase) into glucose, which is then quantified by spectrophotometry.
- Benefits :
- A fast method suitable for complex samples (flours, mushroom extracts).
- Allows beta-glucans to be distinguished from other polysaccharides present in the sample.
- High sensitivity, allowing the detection of low concentrations.
Applications : Widely used for quality control in the food industry, this method is validated by theAOAC (Association of Official Analytical Chemists) and ISO17025.
UV/visible spectroscopy
UV/Visible spectroscopy is an alternative method for quantifying beta-glucans in food and nutraceutical products.
- Principle : Beta-glucans react with specific dyes, resulting in measurable light absorption in the UV-visible spectrum.
- Benefits :
- A simple and quick method, requiring little sophisticated equipment.
- Ideal for routine analysis of samples with high beta-glucan concentrations.
- Limitations : Less precise than chromatography or the enzymatic method, this technique is mainly used for an initial quality control before more in-depth analyses.
Physical methods and molecular structure analysis
Analyzing the structure of beta-glucans is essential to understanding their interaction with the body and their functional properties.
- Dissolution in dimethyl sulfoxide (DMSO) and infrared spectroscopy : Allows the study of the structure of beta-glucan chains and verification of their purity.
- X-ray diffraction analysis : Used to characterize the crystalline forms of beta-glucans and their interaction with water.
- Rheological tests : Measures the impact of beta-glucans on the viscosity and texture of food and cosmetic products.
These techniques are particularly useful for the development of new food and pharmaceutical formulations, ensuring better bioavailability and stability of beta-glucans.
Standards and regulations for beta-glucan analysis
Beta-glucan analyses must meet strict criteria defined by several regulatory bodies.
- ISO 17025 standard : This standard defines the competence requirements for testing laboratories and guarantees the reliability of analytical results.
- EFSA and FDA regulations : For a product to claim health effects, it must contain a sufficient amount of beta-glucans validated by certified analyses.
- Migration tests for materials in contact with food (EC Regulation No. 1935/2004): Verifies that packaging does not release contaminants that could alter the quality of beta-glucans.
These regulations are essential to guarantee the authenticity and safety of products containing beta-glucans, particularly in the health and food sectors.
Case studies: beta-glucan analysis with YesWeLab
Beta-glucan analysis is a major challenge for manufacturers in the food, nutraceutical, and cosmetics industries. To ensure product quality and regulatory compliance, it is essential to rely on a specialized laboratory. YesWeLab, through its network of over 200 partner laboratories, supports companies in obtaining reliable and certified analyses.
Why use a specialized laboratory?
Beta-glucan analysis requires specific equipment and advanced technical expertise. Manufacturers do not always have the internal resources to perform these tests in accordance with international standards. Outsourcing these analyses to a specialized laboratory offers several advantages:
- Reliability and accuracy of results : ISO 17025 accredited laboratories use scientifically validated methods, guaranteeing accurate and reproducible results.
- Compliance with regulatory requirements : The tests carried out meet the criteria imposed by EFSA(Europe), FDA (United States) and other international bodies.
- Time and efficiency gains : Manufacturers can focus on developing their products without worrying about setting up complex analyses.
- Access to cutting-edge technologies : Specialized laboratories have advanced analytical equipment (HPLC, spectroscopy, enzymatic method) ensuring precise detection of beta-glucans.
YesWeLab offers a turnkey service to meet these needs, facilitating the sending of samples, the monitoring of analyses and the receipt of results via its intuitive digital platform.
Services offered by YesWeLab for beta-glucan analysis
YesWeLab provides manufacturers with a wide range of analytical services adapted to different matrices containing beta-glucans.
Quantification of beta-glucans
Quantitative analysis is essential to ensure that the beta-glucan content stated on a product accurately reflects reality. YesWeLab offers:
- HPLC assay : Reference method allowing precise separation of polysaccharides.
- Assay by enzymatic method : Rapid and reliable technique for measuring the concentration of beta-glucans.
- UV/Vis spectroscopy assay : A simpler approach suitable for routine controls.
These analyses allow manufacturers to optimize their formulations and validate their health claims with regulatory authorities.
Purity verification and contaminant identification
Products containing beta-glucans can be subject to alteration, fraud, or contamination. YesWeLab conducts additional tests to guarantee their quality:
- Identification of impurities : Detection of other undesirable polysaccharides (cellulose, starch).
- Microbiological analysis : Detection of microbial contaminants (bacteria, yeasts, molds).
- Mycotoxin assay : Possible presence of toxins produced by fungi.
These tests are particularly important for food supplements and pharmaceutical formulations, where the purity of ingredients is an essential criterion.
Stability and interaction tests in formulations
Beta-glucans interact with other components of food and cosmetic formulations. YesWeLab offers stability and interaction tests to evaluate:
- The resistance of beta-glucans to storage conditions (heat, humidity, light).
- The impact of beta-glucans on the texture of products (viscosity of creams, fluidity of fortified drinks).
- Their behavior in the presence of other active ingredients (vitamins, minerals, proteins).
These tests allow manufacturers to optimize their formulations to guarantee maximum effectiveness of beta-glucans in their finished products.
Specific analyses for materials in contact with beta-glucans
Products enriched with beta-glucans are often packaged in materials that can interact with their components. YesWeLab offers migration tests to ensure that the materials used meet safety standards.
- Global and specific migration tests : Evaluation of substances that can be transferred from the packaging to the product (e.g., plastics, inks, varnishes).
- Compliance with European and American standards : Verification according to EC Regulation No. 1935/2004 and FDA standards .
These tests are particularly important for products intended for export, where regulatory requirements vary from country to country.
