Overview: What Is Maltitol?
Maltitol is a polyol-type functional sweetener and is typically declared on product labels as a “sweetener” or “sugar alcohol”. It is produced by catalytic hydrogenation of maltose, thereby retaining a sweetness profile and mouthfeel close to sucrose while delivering lower energy and a reduced glycemic response. Because of these characteristics, it is widely used in sugar-free or reduced-sugar foods, chewing gum, chocolate, baked products, and oral pharmaceutical preparations.
For students, instructors, and researchers, maltitol is a representative sugar alcohol that combines formulation functionality with nutritional and physiological characteristics. It is well suited as a case study ingredient in courses or research related to “low-sugar ingredients” and “alternative sweeteners”.
Basic Information and Physicochemical Properties
1. Chemical name: 4-O-α-D-glucopyranosyl-D-sorbitol
2. Classification: Disaccharide polyol (a polyol obtained by hydrogenation of maltose, structurally regarded as a hydrogenated disaccharide composed of glucose and sorbitol)
3. Molecular formula: C₁₂H₂₄O₁₁
4. Relative molecular mass: ~344.3
1. Physical Forms and Sensory Characteristics
1. Common commercial forms include crystalline maltitol and maltitol syrup.
2. Its sweetness is approximately 80–90% that of sucrose, with a clean, sucrose-like sweetness and aftertaste.
3. It is readily soluble in water and poorly soluble in most organic solvents.
4. Crystalline maltitol is relatively low in hygroscopicity, but under high humidity or prolonged exposure it may gradually absorb moisture and cake, so protection from moisture during storage is necessary.
2. Thermal Stability and Browning
1. Maltitol is a non-reducing sugar alcohol. Under typical food-processing conditions, it is less prone to Maillard browning reactions than reducing sugars such as glucose and lactose, which helps maintain a light product color.
2. At elevated temperatures and prolonged heating times—particularly in the presence of small amounts of reducing sugars or metal ions—some degradation and color darkening may still occur. Process optimization is therefore required in high-temperature applications.
Metabolism, Energy Value and Glycemic Response
1. Digestive and Absorptive Pathway
The metabolism of maltitol in humans can be broadly described as a “two-step” process:
1. Partial hydrolysis and absorption in the small intestine:
A portion of ingested maltitol is hydrolyzed by intestinal enzymes to glucose and sorbitol, which are then absorbed and enter the normal carbohydrate metabolic pathways.
2. Fermentation in the large intestine:
The fraction not absorbed in the small intestine passes into the large intestine and is fermented by the gut microbiota to short-chain fatty acids (such as acetate, propionate and butyrate) and gases. This fermentative step is the main reason why high intakes may cause gastrointestinal discomfort.
2. Energy Value
Based on multiple studies and regulatory evaluations, the metabolic energy of maltitol is approximately:
1. Common value used on U.S. labels: ~2.1 kcal/g (an FDA-recognized conversion value)
2. EU and most other regions: ~2.4 kcal/g
Both values are lower than the 4 kcal/g of sucrose, but clearly higher than those of virtually non-caloric high-intensity sweeteners (such as aspartame and sucralose). In formulation design and nutritional calculations, maltitol should therefore be treated as a low-energy polyol, not as a “zero-calorie” ingredient.
3. Blood Glucose and Insulin Response
Clinical studies have shown that, compared with equivalent amounts of sucrose or glucose, beverages containing maltitol or foods such as maltitol-containing chocolate produce significantly lower postprandial blood glucose and insulin responses. The glycemic index (GI) of maltitol is reported in most studies to be around 30–35 (with some literature giving slightly higher values), whereas the GI of sucrose is about 65.
It is important to emphasize that:
1. Maltitol does not completely eliminate increases in blood glucose; rather, it produces a smaller rise compared with sucrose.
2. For individuals with diabetes or those needing to control blood glucose, maltitol can be one of the options for replacing sucrose, but the carbohydrates and energy it provides must still be included in total intake.
Safety and Regulatory Status
1. International Evaluations
1. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated maltitol and maltitol syrup on multiple occasions and has conducted systematic toxicological safety assessments.
2. JECFA has assigned maltitol an acceptable daily intake (ADI) of “not specified”, meaning that when it is used according to good manufacturing practice and actual technological need, no specific numerical limit in mg/kg body weight per day is required. This conclusion has been reaffirmed in several subsequent meetings.
2. European Union and United States
1. In its scientific opinions, the European Food Safety Authority (EFSA) has confirmed that maltitol and other polyols may be used as sugar replacers in foods, including formulations that underpin health claims such as “reduction of postprandial glycemic response” and “maintenance of tooth mineralization”. In the European Union, maltitol is approved for use in a wide range of foods under the additive number E 965.
2. In the United States, maltitol is considered safe for use in foods as a sweetener and excipient, and it is generally present in the regulatory framework as either a GRAS substance or an approved food additive.
3. Chinese Regulation (GB 2760)
In China, maltitol and maltitol syrup are listed in GB 2760 Standards for Uses of Food Additives. They may be used as sweeteners, stabilizers, humectants, emulsifiers, leavening agents and thickeners, and can be added as needed in frozen desserts, chocolate and cocoa products, confectionery, baked goods, beverages, jams and jellies, condiments, tabletop sweeteners and many other categories.
For certain specific categories (such as frozen minced fish and its products), GB 2760 stipulates explicit maximum use levels. Formulation design should therefore always refer to the latest version of the standard.
Key Health and Safety Considerations: Digestive Tolerance and Oral Effects
1. Digestive Tolerance and the “Sugar Alcohol Effect”
1. As with other polyols, maltitol is only partially absorbed in the small intestine. The unabsorbed fraction passes into the large intestine, where it is fermented by gut microbiota to short-chain fatty acids and gases.
2. Human studies indicate that when consumed in relatively large single doses, some individuals may experience symptoms such as abdominal bloating, increased flatulence, borborygmus, loose stools or diarrhea. The incidence of these effects is related to total intake and individual tolerance.
3. During product development and study design, the amount of polyols per serving is typically controlled with reference to the tolerance characteristics of different populations. Many prepackaged foods containing polyols also carry a label statement such as “excessive consumption may cause laxative effects” to remind consumers to monitor their intake.
2. Oral Health and Anti-Caries Properties
1. Compared with sucrose, maltitol is hardly fermented by oral bacteria to produce acids and therefore has much less effect on enamel demineralization. It is generally regarded as a low-cariogenic or non-cariogenic polyol.
2. EFSA’s scientific opinions support the use of polyols to replace sugars as a basis for health claims such as “reduction of postprandial glycemic response” and “maintenance of tooth mineralization”.
3. Consequently, maltitol is widely used in sugar-free chewing gum, sugar-free confectionery, lozenges and children’s oral care-related products, where it helps achieve reduced-sugar or sugar-free formulations while remaining friendly to oral health.
Main Application Scenarios
1. Food Industry
In food applications, maltitol provides both sweetness and bulk and is therefore classified as a bulk sweetener. Its main uses include:
1. Confectionery and chocolate:
Widely used in sugar-free or reduced-sugar hard candies, soft candies, toffees, chocolates and fillings. It offers sucrose-like sweetness, a smooth texture and good heat stability, making it suitable for high-temperature confectionery processes.
2. Baked goods:
In bread, cakes and biscuits, maltitol provides both sweetness and moisture retention, helping to slow product drying and extend shelf life. Because it participates less in Maillard reactions, it also helps maintain a relatively light finished color.
3. Ice cream and frozen desserts:
In low-sugar or sugar-free ice cream and frozen desserts, maltitol can reduce overall sugar load while improving ice crystal structure and viscosity, thereby enhancing mouthfeel and melt resistance.
4. Beverages, jams and jellies:
In low-sugar or sugar-free beverages, maltitol is often used together with high-intensity sweeteners (such as sucralose and acesulfame K). In jams, jellies and preserved fruits, it contributes sweetness as well as viscosity and humectancy.
2. Pharmaceutical Industry and Dietary Supplements
1. In oral solid dosage forms (tablets, chewable tablets, lozenges, etc.), maltitol can serve as a sweet bulk excipient, improving palatability and enhancing patient compliance.
2. In sugar-free or low-sugar syrups and oral solutions, it can be used as a sweetening and bulking vehicle to partially replace sucrose or other sugars.
It should be noted that the specific scope of use and dosage of maltitol in medicinal products and dietary supplements must always comply with the pharmacopeias and relevant regulations of the respective country or region.
3. Other Applications (Cosmetics and Personal Care)
Benefiting from its humectant properties and mild sweetness, maltitol is also used in certain cosmetics and personal care products (such as lip care products and oral hygiene products) as a moisturizer or auxiliary sweetening component.
Brief Overview of the Production Process
The general industrial process for manufacturing maltitol can be summarized as follows:
1. Starch saccharification
Starch from corn, potatoes or other sources is used as the raw material. Through the synergistic action of α-amylase, β-amylase and debranching enzymes, the starch is partially hydrolyzed into a high-maltose syrup in which maltose is the main component.
2. Catalytic hydrogenation
In the presence of nickel-based or similar catalysts, the maltose-rich syrup is subjected to high-pressure hydrogenation, reducing maltose to maltitol and simultaneously forming small amounts of other polyols (such as sorbitol).
3. Purification and concentration
Decolorization, filtration and ion-exchange steps are used to remove impurities and metal ions. The solution is then concentrated by evaporation to obtain maltitol syrup.
4. Preparation of crystalline maltitol (optional)
Chromatographic separation is employed to further increase maltitol purity, followed by concentration, crystallization, centrifugation and drying to yield high-purity crystalline maltitol.
For R&D and process development, controlling maltose content, hydrogenation conditions and downstream separation technologies is critical to obtaining maltitol products with different grades and specifications.
Practical FAQ for R&D and Experimental Applications
1. How should I select the appropriate grade of maltitol for formulations or experiments?
1. For food or pharmaceutical formulation studies (e.g., tablets, confectionery, pilot beverage trials), solid maltitol with a purity of ≥95% or ≥98% is generally preferred, as it facilitates accurate weighing and dissolution.
2. For cell-based and molecular biology experiments, it is recommended to choose higher-grade products explicitly labeled as BioReagent, molecular biology grade, UltraBio™, etc., and to pay attention to parameters such as endotoxin levels.
3. When conducting solution screening or high-throughput experiments, ready-to-use stock solutions (such as a 10 mM maltitol DMSO stock, suitable for cell-based/pharmacological screening in systems requiring an organic co-solvent) can be considered to reduce weighing errors and sample preparation workload.
2. How should energy and “sugar load” from maltitol be accounted for in experimental design?
1. In animal or human nutrition studies, the metabolic energy of maltitol is typically calculated as approximately 2.1–2.4 kcal/g, which is clearly lower than the 4 kcal/g of sucrose but not “zero calorie”.
2. Because maltitol is only partially absorbed in the small intestine and partially fermented in the large intestine, postprandial blood glucose and insulin responses are lower than with equivalent amounts of sucrose. However, maltitol should still be counted as part of digestible carbohydrate in total intake.
3. In controlled experiments, sucrose or glucose is commonly used as a comparator. Treatment groups can be designed based on equal carbohydrate content or equivalent sweetness levels.
3. What should be considered when using maltitol in animal or cell experiments?
1. Solubility: Maltitol is readily soluble in water. When preparing aqueous solutions, it is advisable to use warm water and sufficient stirring. For high-concentration stock solutions, ensure complete dissolution and perform sterilizing filtration.
2. Osmotic effects: In cell culture or gavage studies, high concentrations of polyols can markedly alter osmolality. It is recommended to calculate expected changes in osmolality based on the culture medium or dosing volume in advance, to avoid unintended stress on cells or animals.
3. Gastrointestinal tolerance: In animal experiments or human volunteer studies, when higher doses are used, indices such as stool characteristics and borborygmus should be monitored. Appropriate dose gradients and observation periods should be set.
4. How compatible is maltitol with other components (proteins, amino acids, pH conditions)?
1. Maltitol is a non-reducing sugar alcohol and is not prone to Maillard reactions under typical processing or experimental conditions. Its tendency to cause browning in the presence of proteins and amino acids is relatively low, making it suitable for color-sensitive systems.
2. It is relatively stable with respect to pH and heat, and can generally be heated in neutral and mildly acidic environments at typical food-processing temperatures without significant degradation. Under extreme conditions of high temperature and strong acidity, gradual degradation or discoloration may still occur.
3. In formulation design where pronounced baked color and flavor are desired, maltitol is often used in combination with a certain amount of reducing sugars (such as glucose or lactose).
5. What are the key methodological considerations when analyzing maltitol content or related components?
1. Common analytical techniques include HPLC (with refractive index detection, RID, or evaporative light scattering detection, ELSD), GC with derivatization, and ion chromatography. The choice depends on laboratory instrumentation.
2. When samples contain multiple sugars and polyols such as sorbitol, maltose and glucose, it is advisable to use the corresponding analytical standards or standard solutions (e.g., glucose, sucrose, sorbitol reference materials) to support validation of linearity, recovery and precision.
3. Sample pretreatment should address deproteinization, defatting and appropriate dilution factors to avoid baseline drift or non-linear detector response caused by high concentrations of polyols.
6. What should be noted regarding the storage and handling of maltitol and related reagents?
1. Solid maltitol is somewhat hygroscopic. It should be kept tightly sealed and protected from moisture; after opening, exposure time should be minimized. Storage in a desiccator is recommended when necessary.
2. Polyols tend to cake, but this usually does not affect their chemical properties. Caked material can be thoroughly pulverized and dissolved under dry conditions. For analytical applications, solution concentrations should be reconfirmed after redissolution.
3. Aqueous solutions containing maltitol are generally recommended for short-term storage at 2–8 °C. For long-term use, solutions should preferably be prepared fresh as needed or aliquoted and frozen, with clear labeling of preparation date and concentration.
Aladdin Maltitol and Related Product Selection Reference
To facilitate product selection in practical work, and in line with the maltitol production and application context described in this article, a corresponding selection table has been compiled from Aladdin’s current product portfolio.
The table is organized into five categories by intended use:
1. Sweeteners / polyols:
Maltitol as the core product, together with commonly used comparator polyols such as sorbitol;
2. Carbohydrate substrates and comparator sugars:
Maltose / maltose syrup (maltitol precursors), glucose, sucrose and others;
3. Starches and excipients:
Process raw materials such as corn starch, potato starch and pregelatinized starch;
4. Process enzymes:
α-amylase, β-amylase, pullulanase and other enzymes used in high-maltose syrup and maltitol preparation studies;
5. Analytical reference materials:
Standards and standard solutions of glucose, sucrose, sorbitol and related analytes to support method development and quality control.
Only representative products and their key features are listed in the table below. Additional grades and packaging options can be found on the Aladdin website by searching the CAS number or product catalog number.
Category | Aladdin Cat. No. | Name | CAS No. | Specification / Purity | Product Features / Application Description |
Sweeteners / polyols – Maltitol | Maltitol | 585-88-6 | ≥98% | High-purity solid maltitol, suitable as a functional sweetener, polyol control and for formulation development studies | |
Sweeteners / polyols – Maltitol | Maltitol | 585-88-6 | ≥95% | General-grade maltitol, suitable for basic food/pharmaceutical-related experiments and process evaluation | |
Sweeteners / polyols – Maltitol | Maltitol | 585-88-6 | 10 mM in DMSO | Ready-to-use 10 mM DMSO stock solution, suitable for cell-based, enzymatic and pharmacological screening experiments requiring precise dosing | |
Sweeteners / polyols – Sorbitol | D-sorbitol | 50-70-4 | UltraBio™, ≥99% (HPLC) | UltraBio™ high-purity sorbitol, suitable for demanding biological experiments and as a comparator functional sweetener | |
Sweeteners / polyols – Sorbitol | S104836 | D-sorbitol | 50-70-4 | For cell culture, ≥98% | Sorbitol for cell culture use, suitable for medium preparation and osmolality control studies |
Sweeteners / polyols – Sorbitol (pharmaceutical grade) | P432786 | D-sorbitol | 50-70-4 | GMP, PharmPure™, JP, BP, Ph.Eur, NF, pharmaceutical grade | Pharmaceutical-grade sorbitol recognized by multiple pharmacopeias, suitable for use as an excipient in oral dosage forms and for pre-registration studies |
Analytical reference materials – Sorbitol | D-sorbitol | 50-70-4 | Analytical standard, ≥99.5% (HPLC) | Sorbitol analytical standard for instrument calibration, method development and quality control | |
Carbohydrate substrates – Maltose / maltose syrup (maltitol precursor) | Maltose syrup | 69-79-4 | BioReagent, molecular biology grade, ~20% in H₂O | Molecular biology-grade aqueous maltose syrup, used in carbohydrate metabolism and enzyme kinetics studies, and as a precursor in maltitol process research | |
Carbohydrate substrates – Maltose / maltose syrup (maltitol precursor) | Maltose syrup | 69-79-4 | 10 mM in DMSO | Maltose syrup in DMSO, suitable for high-throughput screening and inhibition/activation studies requiring an organic solvent system | |
Carbohydrate substrates – Glucose (pharmaceutical / high grade) | D-(+)-Glucose | 50-99-7 | GMP, anhydrous, PharmPure™, USP, BP, Ph.Eur, pharmaceutical grade | Multi-pharmacopeia, GMP-grade anhydrous glucose, suitable as a high-standard pharmaceutical excipient and for formulation development | |
Carbohydrate substrates – Glucose (low endotoxin) | G640146 | D-(+)-Glucose | 50-99-7 | Moligand™, animal-free, low endotoxin, for cell culture, ≥99% | Animal-free, low-endotoxin glucose, suitable for biopharmaceutical, immune cell and other highly sensitive culture systems |
Carbohydrate substrates – Glucose | D432808 | D-(+)-Glucose | 50-99-7 | Moligand™, BioReagent, powder, suitable for hybridoma | BioReagent-grade glucose powder, suitable for hybridoma culture and biochemical experiments |
Analytical reference materials – Glucose | D-(+)-Glucose | 50-99-7 | Moligand™, analytical standard | Glucose analytical standard for establishing and calibrating analytical methods | |
Analytical reference materials – Glucose | Glucose standard solution | 50-99-7 | Moligand™, 1000 μg/mL | Glucose standard solution at 1000 μg/mL for instrument calibration and standard curve preparation | |
Carbohydrate substrates – Glucose | D-(+)-Glucose | 50-99-7 | UltraBio™, anhydrous, ≥99.5% (HPLC) | UltraBio™ anhydrous glucose with high purity, suitable for biochemistry and metabolic pathway studies | |
Carbohydrate substrates – Sucrose (molecular biology grade) | Sucrose | 57-50-1 | Moligand™, molecular biology grade, ≥99.5% (HPLC) | Molecular biology-grade sucrose, suitable for nucleic acid, protein and cell-based experimental systems | |
Carbohydrate substrates – Sucrose | Sucrose | 57-50-1 | AR | Analytical reagent-grade sucrose for routine analytical and teaching experiments | |
Analytical reference materials – Sucrose | Sucrose | 57-50-1 | Moligand™, analytical standard | Sucrose analytical standard for quantitative analysis, quality control and method validation | |
Carbohydrate substrates – Sucrose (pharmaceutical grade) | Sucrose | 57-50-1 | GMP, PharmPure™, JP, BP, Ph.Eur, NF, pharmaceutical grade | Pharmaceutical-grade sucrose compliant with multiple pharmacopeias, suitable for high-end formulations and registration studies | |
Analytical reference materials – Sucrose | Sucrose aqueous standard | 57-50-1 | Moligand™, analytical standard, 30.3% in water | 30.3% sucrose standard solution, suitable for evaluating linearity ranges and accuracy | |
Carbohydrate substrates – Sucrose (cell / insect cell) | Sucrose | 57-50-1 | Moligand™, for cell culture, for insect cell culture, ≥99.5% | High-purity sucrose suitable for mammalian and insect cell culture, useful for medium optimization | |
Starches and excipients – Corn starch | S116030 | Corn starch | 9005-25-8 | Reagent grade | Reagent-grade corn starch, suitable for starch saccharification, teaching experiments and studies on starch structure |
Starches and excipients – Corn starch (pharmaceutical grade) | S116028 | Corn starch | 9005-25-8 | Pharmaceutical grade, PharmPure™ | Pharmaceutical-grade corn starch, suitable for use as a tablet disintegrant/filler and for other excipient studies |
Starches and excipients – Potato starch (pharmaceutical grade) | Potato starch | 9005-25-8 | Pharmaceutical grade, PharmPure™ | Pharmaceutical-grade potato starch for excipient research and dosage form development, enabling comparison of starches from different sources | |
Starches and excipients – Pregelatinized starch | P1373823 | Pregelatinized starch | 9005-25-8 | PharmPure™, pharmaceutical grade | Pregelatinized starch suitable for direct compression, scale-up of solid dosage forms and formulation screening |
Process enzymes – α-Amylase | α-Amylase | 9000-90-2 | EnzymoPure™, BioReagent | BioReagent-grade α-amylase for starch liquefaction, enzyme kinetics and teaching experiments | |
Process enzymes – α-Amylase (thermostable) | Thermostable α-amylase | 9000-90-2 | EnzymoPure™, BioReagent | Thermostable α-amylase suitable for high-temperature liquefaction and simulation of industrial maltose/maltitol process conditions | |
Process enzymes – β-Amylase | β-Amylase | 9000-91-3 | EnzymoPure™, ≥10,000 AUN/g (powder), from soybean | High-activity soybean-derived β-amylase for saccharification, increasing maltose content and enzymology studies | |
Process enzymes – β-Amylase | β-Amylase | 9000-91-3 | EnzymoPure™, ≥700,000 units/g, from sweet potato | Ultra-high-activity sweet potato-derived β-amylase, suitable for producing high-maltose syrup and optimizing high-saccharification processes | |
Process enzymes – Pullulanase (debranching enzyme) | Pullulanase | 9075-68-7 | EnzymoPure™, ≥1000 npun/g | Typical debranching enzyme for degrading branched starch, improving the efficiency of high-maltose/maltitol production and serving as a key auxiliary enzyme in maltitol processes |