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Sorbitol liquid is a transparent and viscous aqueous solution of a poly-sugar alcohol obtained by hydrogenation of glucose. It appears colorless or pale yellow in appearance and has a mild sweetness (with a sweetness level approximately 60% of that of sucrose) and excellent thermal stability and hygroscopicity. Its molecular structure contains multiple hydrophilic hydroxyl groups, which can form strong hydrogen bonds with water. This characteristic makes it an ideal humectant, sweetener, and texture modifier, and is widely used in the food, pharmaceutical, and cosmetics industries. In food, it is used as a low-calorie sugar substitute in sugar-free candies, baked goods, and beverages, and can inhibit crystal formation to maintain the soft texture of the products.
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Chemical Formula |
C6H14O6 |
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Exact Mass |
182 |
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Molecular Weight |
182 |
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m/z |
182 (100.0%), 183 (6.5%), 184 (1.2%) |
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Elemental Analysis |
C, 39.56; H, 7.75; O, 52.69 |
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According to China's Hygienic Standard for the Use of Food Additives (GB2760-1996), sorbitol (liquid) can be used for ice-cream, popsicle, pastry, beverage, biscuit, bread, pickle and candy according to production needs. In practical production, sorbitol can be used as nutritional sweetener, wetting agent, chelating agent and stabilizer. The food using sorbitol can be used by patients with diabetes, liver disease and cholecystitis. In addition to being used as a sweetener, sorbitol also has the functions of moisturizing, chelating metal ions, and improving tissue (making cake delicate and preventing starch from aging).In the pharmaceutical industry, it is used as a humectant and stabilizer for liquid preparations, improving the palatability of drugs. In the cosmetics field, it is commonly found in toothpaste and creams to prevent water evaporation. In industry, it is used as a plasticizer and surfactant raw material. This substance has the characteristics of being difficult to ferment and resistant to acid and heat, and its metabolic pathway after human intake is not regulated by insulin, making it suitable for diabetic patients. However, it should be noted that excessive intake may cause osmotic diarrhea. Its biodegradability and non-toxicity meet the environmental protection and safety requirements of modern industry.
Sorbitol powderl, also known as D-sorbitol, is a hexagonal alcohol with the molecular formula C ₆ H ₁₄ O ₆ and a relative molecular weight of 182.17. As an important food additive, sorbitol has a wide range of applications in the food industry. Its unique physicochemical properties and physiological characteristics enable it to meet various food processing needs.
Basic properties
1. Chemical structure
Sorbitol is a hexagonal alcohol with four crystal structures (α, β, γ, δ) and an amorphous glass transition state. Its molecular structure contains six hydroxyl groups (- OH), giving it the characteristics of a polyol.
2. Physiological characteristics
Metabolic characteristics: Sorbitol is a kind of sugar alcohol that can be slowly metabolized by people. Its metabolism does not cause blood sugar to rise, and it is suitable for use as a sweetener and nutrient in food for diabetics.
Caloric value: The calorie value of sorbitol is relatively low, about 2.6 kcal/g, much lower than that of sucrose (4 kcal/g).
Functional characteristics in food
1. SweetenerSweetness: The sweetness of sorbitol is about 60% of that of sucrose, and it can be used as a substitute for sugar, providing a sweetness similar to sucrose.
Flavor: Sorbitol has a refreshing sweet taste and absorbs heat when dissolved in water, enhancing the coolness of food. It is particularly suitable for use in foods such as mint candies and refreshing drinks.
2. Moisturizing agents
Moisture absorption: Sorbitol has significant moisture absorption, with a slightly lower moisture absorption capacity than glycerol and much greater than sucrose. Adding sorbitol to food can maintain its freshness, softness, and prevent cracking.
Moisturizing effect: The multi hydroxyl structure of sorbitol endows it with excellent moisturizing properties, which can adjust the dryness and humidity of food and extend the shelf life of products.
3. Stabilizers
Chemical stability: The chemical properties of sorbitol are relatively stable, non combustible, non-volatile, acid and alkali resistant, and not easily oxidized by air. During food processing, sorbitol can maintain stable chemical properties to prevent adverse changes in food during heating or storage.
Thermal stability: Sorbitol has good thermal stability and does not react with soluble amino compounds to cause Maillard browning when heated, making it suitable for use in baked goods.
4. Thickener
Viscosity of aqueous solution: Sorbitol powder dissolves in water to form an aqueous solution with high and stable viscosity, and its thickening effect is mild and not easy to cause excessive stickiness, making it an ideal natural thickener in food processing. It can effectively improve the texture and consistency of food, make the taste more smooth and delicate, and also help maintain the stable shape and structure of food during storage and processing, avoiding stratification or precipitation. This property makes it widely used in jams, jellies, dairy products, beverages and pastries.
5. Preservatives
Antimicrobial properties: Sorbitol powder exhibits obvious antimicrobial activity at high concentrations in food systems. It can reduce the water activity in food, create a hypertonic environment that is not suitable for the growth and reproduction of most bacteria, molds and yeasts, and inhibit the metabolic activities of microbial cells, thereby effectively slowing down food spoilage. As a non-toxic natural preservative, it does not affect the original flavor and nutritional components of food while extending the shelf life, and is often used in combination with other food preservatives in baked goods, candies, preserved fruits and condiments to enhance the fresh-keeping effect.
Specific applications in various types of food
1. Baking food
Bread and cake: Sorbitol is used as a moisturizer in baked goods such as bread and cake, which can absorb and retain moisture, prevent moisture loss during storage, and prevent bread from becoming hard and cake from drying out.
Addition amount: In pastries and biscuits, the recommended addition amount of sorbitol is 3% to 10%.
2. Candy
Low sugar or sugar free candies: Sorbitol is used as a sweetener to produce low sweetness or sugar free candies, which have the effect of preventing dental caries. Its low sweetness and non utilization by some bacteria make it an ideal raw material for producing low sugar candy Dim sum.
Addition amount: In various types of candies, the recommended application amount of sorbitol is 3% to 15%.
3. Dairy products
Yogurt and cheese: Sorbitol helps improve the texture and taste of dairy products such as yogurt and cheese. In yogurt, it can make yogurt more delicate and smooth; In cheese, it can prevent problems such as cracking and roughness during storage.
Addition amount: Adjust according to the specific product formula.
4. Beverages
Sugar free or low sugar beverages: Sorbitol, as a sweetener, enhances the flavor of the beverage while also having anti caries and anti turbidity effects.
Addition amount: The appropriate amount of sorbitol added to beverages is controlled between 3% and 5%.
5. Frozen food
Ice cream and ice cream: The aqueous solution of sorbitol has the characteristic of lowering the freezing point. When used in frozen foods such as ice cream and ice cream, it can avoid the production of ice residue, reduce the precipitation of crystal suspensions or precipitates, and improve the taste of the product.
Addition amount: The recommended addition amount of sorbitol in ice cream is 3% to 6%.
6. Other foods
Jam and filling: The moisturizing properties of sorbitol keep the food moist and prevent cracking in its jam and filling.
Addition amount: The recommended addition amount of sorbitol in jam and filling is 5% to 10%.
Vitamin C raw material: Sorbitol powder is an important raw material for producing vitamin C. Through fermentation and chemical synthesis, it can be refined into the vitamin C needed by the human body.
1. Security
Toxicity study:
Sorbitol is usually non-toxic when used in moderation. The oral LC50 of mice ranged from 257000 to 23200 mg/kg, indicating low toxicity.
Metabolic research:
Sorbitol is quickly absorbed in the human body and ultimately metabolized into carbon dioxide and water, which are excreted from the body.
Excessive intake risk:
Excessive intake of sorbitol may lead to liver function damage and increase the risk of obesity. Therefore, attention should be paid to controlling its intake in daily diet.
2. Regulatory restrictions
International regulations:
The Codex Stan 192-1995, developed by the Committee on Food Additives (CCFA) of the Codex Alimentarius Commission (CAC), allows the use of sorbitol as a sweetener, water retaining agent, chelating agent, stabilizer, leavening agent, and thickener in many foods.
Domestic regulations:
China's National Food Safety Standard for the Use of Food Additives (GB 2760-2014) imposes certain restrictions on the amount of sorbitol used in food to ensure food safety.
Sorbitol, as an important food additive, has a wide range of applications in the food industry. Its unique physicochemical properties and physiological characteristics enable it to meet various food processing needs, such as serving as a sweetener, moisturizer, stabilizer, thickener, and preservative. In various types of food, the application of sorbitol can not only improve the texture and taste of food, but also meet consumers' demand for healthy eating. With the increasing attention of consumers to healthy eating, the market demand for sorbitol continues to grow, demonstrating broad market prospects and potential for innovative applications.
The production of sorbitol liquid uses high-quality starch (such as corn starch) as the raw material. Through core processes such as double-enzyme hydrolysis, catalytic hydrogenation, and purification concentration, it achieves large-scale production. The manufacturing process requires strict control of reaction conditions and purification standards to ensure that the product meets the performance requirements of the food, medicine, and other fields.
Core Manufacturing Process
Raw Material Selection and Pre-treatment
The raw material is polysaccharide substances such as corn starch, which must meet the quality standards of purity ≥ 95% and moisture ≤ 12%. During the pre-treatment stage, the starch particles are decomposed into glucose solution through the process of thickening and liquefaction. The addition amount of liquefaction enzymes (such as α-amylase) needs to be precisely controlled at 0.5 - 1.2L/ton of starch, and the reaction temperature is maintained at 85 - 95℃ to achieve efficient conversion.
Dual Enzyme Hydrolysis
Directional hydrolysis is carried out using saccharifying enzymes (such as glucose amylase). In this stage, the pH value needs to be stabilized at 4.2 - 4.5, and the reaction temperature is controlled at 58 - 62℃. The continuous stirring system ensures the efficiency of hydrolysis, and the final glucose conversion rate can reach over 98%, providing high-purity substrates for the subsequent hydrogenation reaction.
Catalytic Hydrogenation Reaction
Under the action of nickel-based catalysts (such as Raney Ni), the glucose solution undergoes hydrogenation reduction at 120 - 140℃ and 8 - 10MPa pressure. This reaction requires precise control of hydrogen flow rate (3 - 5m³/h) and reaction time (2 - 3 hours), with the selectivity of sorbitol reaching over 95%. The catalyst needs to be regenerated regularly to maintain activity, with a regeneration cycle of approximately 500 hours.
Refining and Concentration Process
The hydrogenation product is treated with activated carbon for de-colorization (0.5 - 1.0% usage), and purified by ion exchange resin. It then enters the multi-effect evaporation system for concentration. The solution concentration is increased from 25% to 69 - 71% through three-effect evaporators, with the temperature gradient controlled at 80℃, 60℃, and 40℃, effectively preventing the degradation of heat-sensitive components. The final product must comply with the GB 7658-2005 standard, with a dry weight of ≤ 30% and a reducing sugar content of ≤ 0.15%.
Key Quality Control Points
Purity Control System
Establish a full-process quality monitoring system from raw materials to finished products: The starch raw materials need to be tested for ash content (≤ 0.3%), protein (≤ 0.5%), etc.; the glucose intermediate needs to be determined by HPLC for purity (≥ 99.5%); the finished sorbitol liquid needs to meet safety limits for heavy metals (Pb ≤ 1mg/kg), arsenic (As ≤ 1mg/kg), etc.
Crystallization Formulation Control
For the production of crystalline sorbitol, the stability of the crystal form needs to be controlled through the melt crystallization process. The crystallization temperature is maintained at 98 - 102℃, and the cooling rate is controlled at 0.5 - 1.0℃/min. The melting point range of the final product can be precisely controlled to 88 - 102℃, with a relative density of 1.48 - 1.49g/cm³.
Microbial Risk Prevention
The production environment needs to comply with GMP standards. Key control points include: air purification system (cleanliness ≥ 100,000 grade), equipment sterilization (121℃ wet heat sterilization for 30 minutes), and packaging sealingity testing (negative pressure method, ≤ -80kPa). The microbial indicators of the finished product need to meet: colony count ≤ 100CFU/g, mold and yeast ≤ 50CFU/g.
Manufacturing Equipment Selection
Reaction System
The hydrogenation reactor is made of 316L stainless steel, with a design pressure of 12MPa, a volume of 5 - 10m³, and is equipped with a magnetic stirring device to ensure the mass transfer efficiency. A hydrogen circulation system (flow rate 50 - 100m³/h) and a tail gas treatment device (activated carbon adsorption + catalytic combustion) are also provided.
Separation and Purification Equipment
The centrifuge selected is a horizontal spiral settling type, with a processing capacity of 5 - 10m³/h, and a separation factor of ≥ 3000g. The ion exchange system uses a composite column of anion and cation resins (specification Φ800×3000mm), with a working flow rate of 10 - 15BV/h, and the resin regeneration cycle is 200BV.
Concentration and Drying Device
The multi-effect evaporator adopts a descending film design, with an evaporation capacity of 5 - 8 tons/hour, and the steam consumption is ≤ 0.3 tons/ton of water. The spray drying tower is equipped with a centrifugal atomizer (rotational speed 15,000 - 20,000 rpm), with inlet air temperature ranging from 180 - 200℃ and outlet air temperature ranging from 80 - 90℃. The moisture content of the product is ≤ 3%.
Industry Application Compatibility
Food Industry
The 69 - 71% concentration sorbitol liquid is widely used in sugar-free candies (addition amount ≤ 30g/kg), low-fat ice cream (replacing 30 - 50% sucrose) and other fields. Its low calorific value characteristic (2.6 kcal/g) and anti-caries effect make it a core sweetener for diabetes-specific foods.
Pharmaceutical Field
Pharmaceutical products need to meet USP/BP standards and are used for vitamin C synthesis (purity ≥ 99.5%), injection preparation (pH 5.0 - 7.5), and bile-promoting drug carriers, etc. Its good biocompatibility can be used as a moisturizing component in medical dressings (addition amount 5 - 10%) to significantly accelerate wound healing speed.
Cosmetics Industry
In toothpaste, it is used as a moisturizing base (addition amount 20 - 30%), which can maintain the stability of the paste for up to 24 months; in cosmetics, it is used as an emulsifying stabilizer (addition amount 2 - 5%), which can enhance the moisturizing persistence of face cream (moisturization rate increases by 40% at relative humidity of 80%).
FAQ
What is the use of sorbitol liquid?
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Sorbitol is a product that can be used as a laxative to relieve constipation, and also as a urologic irrigating fluid. May also be used as a pharmaceutical sweetener.
Is sorbitol liquid safe?
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Sorbitol was first used in the USA by the food industry in 1929. The Generally Recognized as Safe (GRAS) list of Food and Drug Administration (FDA) suggests a tolerance of 7% of sorbitol in foods. FDA studies have found no toxicity and determine the normal level of consumption of sorbitol to be 25 g daily in two doses.
What does sorbitol do to the human body?
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SORBITOL (SOR buh tol) treats occasional constipation. It works by increasing the amount of water your intestine absorbs. This softens the stool, making it easier to have a bowel movement. It also increases pressure, which prompts the muscles in your intestines to move stool.
What are the disadvantages of sorbitol?
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Common side effects may include diarrhea, nausea, vomiting, stomach pain, or dry mouth. Do not use sorbitol if you have nausea, vomiting, or stomach pain with your constipation. Stop using sorbitol and contact your health care provider if you have blood in your poop or if you do not poop after using it.
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