Food-grade 99% BETA-CYCLODEXTRIN 7585-39-9

What is Beta-Cyclodextrin? How does it work?

Beta-Cyclodextrin, also known as cyclodextrin, cycloheptaamylose, cyclomaltoheptaose, betadextrin, cyclomaltoheptaose, cycloheptaamylose, and Kleptose, has the chemical formula C42H70O35 (i.e., (C6H10O5)7), a molecular weight of 1134.98, CAS number 7585-39-9, EINECS 231-493-2, UNII JV039JZZ3A, and the international food additive number E459 (EU)/INS 459. It is a cyclic oligosaccharide composed of seven D-glucopyranose units linked end-to-end by α-1,4 glycosidic bonds, and belongs to the cyclodextrin family (one of the three common cyclodextrins: α, β, and γ). It is a natural source molecule obtained by enzymatic hydrolysis and cyclization of starch by cyclodextrin glucosyltransferase (CGTase): the molecule is hollow truncated cone-shaped, with a hydrophilic outer wall and a hydrophobic inner cavity, which can encapsulate flavorings, flavor substances, bitter components, off-flavor molecules, etc. in the cavity like a miniature molecular cage. With its inclusion, flavor-masking, stabilizing, sustained-release, solubilizing, and descaling functions, β-cyclodextrin spans five major fields: food, cosmetics, industry, and scientific research. In food, it serves as a flavor carrier and protectant for fragrances and flavorings (FDA approved as a flavoring/auxiliary agent and formulation aid, applicable to dry mixes for baking, breakfast cereals, chewing gum, gelatin pudding, dry soup mixes, flavored coffee and tea, compressed candy, processed cheese, flavored savory snacks and beverage dry mixes, etc.), and is also an encapsulation carrier and thickening aid for food additives. In cosmetics, it acts as an active ingredient encapsulation carrier, adsorbent, chelating agent (listed in EUCOSMETICS), and deodorant. In industry, it functions as a deodorant, pesticide sustained-release carrier, detergent aid, and environmentally friendly adsorbent (EPA permitted as an inert component for non-food pesticides). In scientific research, it is a classic carrier for chromatographic separation, chiral recognition, and molecular inclusion studies.

Basic information : Chemical formula C42H70O35 (composed of 7 glucose units, hence also known as cyclomaltheptaose); Molecular weight 1134.98; CAS number 7585-39-9; EINECS 231-493-2; UNII JV039JZZ3A; DSSTox DTXSID1020358; Common name β-cyclodextrin; Synonyms: β-cyclodextrin, cyclodextrin, cycloheptaose, cycloheptaose, cycloheptaose, cycloheptaose starch, cycloheptaose, cycloheptaose, cycloheptaose starch, schardinger beta-dextrin, CAVAMAX W7, Kleptose, etc.

Structurally , the β-cyclodextrin molecule consists of seven D-glucanopyranoside units linked end-to-end by α-1,4 glycosidic bonds, forming a hollow truncated pyramidal (frustum) shape. The primary and secondary hydroxyl groups on the outer ring of the glucose units form a hydrophilic outer wall, while the CH bonds and ether bonds pointing towards the cavity form a hydrophobic inner cavity. The inner diameter of the cavity is approximately 0.60-0.65 nm, just large enough to accommodate hydrophobic molecules of suitable size, such as benzene rings, terpenes, and steroids.

Physically , β-cyclodextrin is a white or nearly white crystalline powder, almost odorless, tasteless, and slightly sweet; its optical rotation [α]D/25 is approximately +160° to +164° (1% aqueous solution); its solubility in water at room temperature (25℃) is approximately 1.85 g/100 mL, making it the least water-soluble of the three common α, β, and γ cyclodextrins (γ is the most soluble, followed by α); it is readily soluble in hot water and alkaline aqueous solutions, but sparingly soluble in organic solvents such as ethanol and acetone; it has no definite melting point and decomposes upon heating to approximately 290-300℃; it has low bulk density, large specific surface area, good powder flowability, and low hygroscopicity; its aqueous solution is neutral and non-reducing.

Chemically , β-cyclodextrin is a non-reducing cyclic oligosaccharide (without reducing ends in the molecule, and does not react with Fehling's reagent, etc.): it is stable to acids, alkalis, and heat, and is not easily decomposed under conventional food processing (sterilization, baking, boiling) ; its hydrophobic cavity can form a host-guest inclusion complex with various hydrophobic or amphiphilic guest molecules (fragrances, flavorings, bitter substances, off-flavors, active ingredients in pesticides, etc.) through non-covalent interactions. After inclusion, the guest molecule is "trapped" in the cavity, and its volatility, oxidation sensitivity, irritating odor, bitterness, and toxicity are shielded, while the entire outer wall of the molecule remains hydrophilic, and the overall water solubility of the guest molecule is improved; the inclusion process is a reversible equilibrium, and the guest molecule can be slowly released when conditions change (temperature, pH, dilution, competing molecules).

Why do β-cyclodextrins play these roles in various fields such as food, cosmetics, industry, and scientific research? Their mechanisms of action mainly include the following:

Inclusion (molecular cage) mechanism : The hollow hydrophobic cavity encapsulates hydrophobic guests such as flavor, aroma, and odor molecules within the cavity to form inclusion complexes, which is the basis of all the functions of β-cyclodextrin. After inclusion, the guests are isolated from the external environment (oxygen, light, heat, and moisture), while the whole remains hydrophilic and soluble, allowing oil-soluble components to exist stably in the water-based system in a "molecular-level dispersion" state.

Stability and anti-volatility mechanism : After the flavoring and easily oxidized components are encapsulated, their volatility and oxidation sensitivity are significantly reduced, making them less prone to loss and deterioration during drying, baking, sterilization, and storage, thus extending the retention time and improving batch stability; this is the core mechanism by which it acts as a flavor carrier, stabilizer, and nutritional protectant (used in baking, beverage dry mixes, soup mixes, liquid preparations, etc.).

Mechanism of masking and removal : The cavity selectively encapsulates bitter substances (naringin, limonene), off-flavor substances (fishy smell, sulfides, ammonia, aldehydes) and irritating components, reducing their release and thus masking bitterness and unpleasant odors and improving taste; it can also selectively encapsulate target molecules such as cholesterol to achieve removal (low-cholesterol egg/dairy products), with less impact on normal components, achieving "selective removal of impurities and preservation of aroma".

Sustained-release and controlled-release mechanisms : Guest molecules in inclusion complexes are slowly released during oral chewing, dilution, or changes in temperature or pH, achieving sustained release of aroma (chewing gum, candy), slow release and targeted delivery, and sustained release of pesticides in the field, improving efficacy and user experience.

Adsorption and molecular recognition mechanism : The cavity is selective for different molecules in terms of size and hydrophobicity, and can adsorb and enrich specific organic molecules (odor molecules, dyes, organic pollutants) for deodorization and wastewater treatment. It can also be used as a chromatographic stationary phase and molecular recognition material to distinguish isomers from similar molecules. This is the basis for its use in industrial deodorization, environmental adsorption and scientific research separation.

In summary , β-cyclodextrin, with its core "hydrophobic inside, hydrophilic outside" cavity structure, integrates functions such as inclusion, solubilization, stabilization, flavor masking, sustained release, removal, adsorption, and molecular recognition. It is a versatile molecular cage material spanning five major fields: food (flavor carrier, flavor protection, health food), cosmetics (active ingredient encapsulation, deodorization), industry (deodorization, pesticide sustained release, detergent additives, environmental adsorption), and scientific research (chromatographic separation, molecular recognition). Food-grade applications are mainly focused on flavor encapsulation and flavor protection.

All Uses of Beta-Cyclodextrin

1. Baked goods and cereal products (baking/cereal food industry)

Corresponding products: baking dry mixes, bread, cakes, biscuits, breakfast cereals, oatmeal, cookies, mooncakes, pastry premixes, waffle mixes, etc.

Why it works for this purpose: Baking processes are high-temperature processes and flavorings are volatile. β-Cyclodextrin encapsulates the flavorings, significantly reducing evaporation loss and ensuring a lasting aroma in the finished product during baking, packaging, and shelf life. At the same time, it masks the beany and off-flavors in baking ingredients, stabilizes batch flavor, and is an approved flavor carrier and protectant in baking and cereal products.

2. Candy and chewing gum (confectionery industry)

Corresponding products: chewing gum, bubble gum, compressed candy, hard candy, mints, soft candy, fruit-flavored candy, throat lozenges, compressed tablets, filled candy, etc.

Why it works for this purpose: Chewing gum and candy require a sustained release of aroma over a long period of time. β-cyclodextrin, when combined with peppermint oil and fruit flavorings, achieves a slow release, extending the time for aroma perception. At the same time, it masks the bitterness and astringency of the sugar base and functional ingredients (such as plant extracts), maintaining a refreshing taste.

3. Coffee and tea beverages (beverage industry)

Corresponding products: flavored coffee, 3-in-1 coffee, instant coffee, milk tea, tea beverages, fruit-flavored tea, herbal tea, coffee creamer, espresso, etc.

Why it works for this purpose: The aroma components in coffee and tea are volatile and have a noticeable bitter taste. β-cyclodextrin encapsulates and protects the aroma components to prevent flavor loss, and masks the bitterness and astringency brought by caffeine and tea polyphenols, making the taste more rounded; flavored coffee and tea are its typical approved applications.

4. Fruit juice and soft drinks (beverage industry)

Corresponding products: orange juice, grapefruit juice, citrus juice, lemon juice, mixed fruit juice, fruit juice drinks, fruit-flavored soft drinks, functional drinks, plant-based drinks, sports drinks, etc.

Why it can be used for this purpose: Naringin, limonene, and other bitter substances in citrus juices are typical sources of bitterness. β-cyclodextrin selectively encapsulates these bitter substances to remove bitterness, while stabilizing the color and aroma of the juice, preventing the oxidation and deterioration of flavor substances, and improving the refreshing taste and shelf-life stability of the juice.

5. Solid beverages and dry beverage mixes (beverage industry)

Corresponding products: solid beverages, powdered beverages, dry beverage mixes, fruit juice powder, instant tea powder, protein powder beverages, meal replacement powder, non-dairy creamer, effervescent tablet beverages, etc.

Why can it be used for this purpose? During the storage and preparation of solid beverages, the flavorings are easily volatilized and lost. β-cyclodextrin transforms liquid flavorings into stable powdered inclusion complexes, realizing the powdering of flavorings, preventing volatilization and clumping, and ensuring the full release of aroma after preparation. This is its core application as a flavor carrier for beverage dry mixes.

6. Dairy products (dairy industry)

Corresponding products: processed cheese, yogurt, ice cream, cream, dairy beverages, flavored milk, cheese slices, condensed milk, sour cream, dairy desserts, etc.

Why it can be used for this purpose: Dairy products have a delicate flavor and easily absorb off-odors. β-Cyclodextrin acts as a flavor stabilizer and masking component, encapsulating and protecting the aroma of frankincense and added flavorings, masking the oxidative and fishy odors that occur during the storage of dairy products, while stabilizing the emulsion system and improving texture. Processing cheese products is its typical approved application.

7. Cholesterol removal from egg yolks, butter, and dairy products (egg/oil/dairy processing industry)

Corresponding products: low-cholesterol mayonnaise, cholesterol-free egg liquid, low-cholesterol cream, low-cholesterol butter, low-cholesterol cheese, cholesterol-free egg yolk powder, low-cholesterol dairy products, etc.

Why it can be used in this way: The cavity of β-cyclodextrin matches the size of cholesterol molecules, which can selectively encapsulate cholesterol molecules and separate them from systems such as egg yolk, cream, butter, and cheese, while retaining proteins, phospholipids and flavor components. It is a key processing aid for the production of low-cholesterol egg products and dairy products.

8. Meat and aquatic products (meat/aquatic product processing industry)

Corresponding products: sausages, ham, luncheon meat, meatballs, fish balls, surimi products, smoked fish, pickled aquatic products, ready-to-eat seafood, meat-flavored seasonings, etc.

Why it can be used for this purpose: Meat and aquatic products are prone to fishy smells, oxidized oil smells and unpleasant odors. β-cyclodextrin encapsulates and masks fishy smells and odors, while encapsulating and protecting the flavors of meat spices and flavorings, prolonging the flavor retention time and improving the flavor stability of the product.

9. Seasonings and sauces (seasoning industry)

Corresponding products: soy sauce, vinegar, oyster sauce, salad dressing, ketchup, compound seasoning sauce, chili sauce, hot pot base, seasoning powder, chicken essence, broth powder, etc.

Why it can be used for this purpose: Fermented condiments often have pungent and unpleasant odors. β-Cyclodextrin masks fermentation off-flavors and bitterness, improves the salty and umami balance, and at the same time encapsulates and protects spices and flavor enhancers, stabilizes the flavor of the sauce, and prevents the aroma from dissipating during storage.

10. Soup bases and convenience foods (convenience food industry)

Corresponding products: dry soup mix, soup powder, instant noodle seasoning packets, instant porridge, instant soup, broth cubes, flavored powder packets, instant noodle seasoning, instant soup mix, etc.

Why it can be used in this way: The flavorings in dry soup mixes and seasoning packets are easily volatile during processing and storage. β-cyclodextrin can encapsulate the flavorings into powder, preventing volatilization and oxidation, and quickly release the aroma when mixed or cooked. This is a typical application of β-cyclodextrin as a flavor carrier and protectant for dry soup mixes.

1.1 . Fruit and vegetable preservation (fruit and vegetable storage and transportation industry)

Corresponding products: fresh fruit preservation coatings, fruit and vegetable preservatives, fresh-cut fruit and vegetable treatment agents, ethylene absorbent/encapsulating materials, preservation packaging materials, post-harvest treatment agents, etc.

Why it works: Ethylene produced by the respiration of fruits and vegetables after harvest accelerates ripening and aging. β-cyclodextrin can encapsulate ripening gases such as ethylene and release them slowly or isolate them, thus delaying the ripening, softening and decay of fruits and vegetables. At the same time, it can encapsulate antibacterial and preservative components to achieve slow release and extend the shelf life of fruits and vegetables.

1.2 . Flavor and Fragrance Carriers and Flavor Protection (Flavor and Fragrance Industry)

Corresponding products: powdered flavorings, microcapsule flavorings, flavor carriers, flavor protectants, flavor stabilizers, flavor emulsifiers, flavor precursors, flavor sustained-release agents, etc.

Why it can be used for this purpose: In the flavor and fragrance industry, β-cyclodextrin is used as a general flavor carrier and protectant to encapsulate liquid, volatile, and easily oxidized flavors into stable powdery inclusion complexes, achieving anti-volatilization, anti-oxidation, slow release, and precise dosage control. It is used by downstream food companies such as beverage, confectionery, and baking companies and is a common ingredient listed in food ingredient lists (E459).

1.3 . Alcoholic Beverages and Brewing (Alcoholic Beverage Industry)

Corresponding products: beer, fruit wine, rice wine, wine, prepared wine, flavored beverages, low-alcohol beverages, brewed flavoring wines, etc.

Why it can be used for this purpose: During the brewing process, undesirable flavors such as raw grass taste, sulfur taste, bitterness and fusel oil are easily produced. β-cyclodextrin selectively encapsulates and masks off-flavors, stabilizes the aroma of the wine, and improves the cleanliness of the taste and the stability of the flavor. It is used in the refining and flavor control of wines.

1.4 . Cosmetic active ingredient encapsulation and fragrance stabilization (cosmetics industry)

Corresponding products: skin care products, lotions, creams, serums, perfumes, deodorants, makeup, face masks, toothpaste, mouthwash, sunscreens, etc.

Why it can be used for this purpose: Fragrances and active ingredients (plant extracts, whitening/anti-aging ingredients) in cosmetics are prone to volatility, oxidation, or skin irritation. β-cyclodextrin encapsulation achieves sustained release of fragrance, stability and sustained release of active ingredients, and reduced irritation. At the same time, it acts as an adsorbent and chelating agent to improve the stability of the formulation.

15. Cosmetics and Personal Care Deodorants (Daily Chemical Industry)

Corresponding products: deodorant, antiperspirant, foot care deodorant, shoe deodorant, breath freshener, oral care deodorant, pet deodorant, etc.

Why it works for this purpose: Odor molecules (ammonia, sulfides, short-chain fatty acids, etc.) produced by sweat and bacterial metabolism can be encapsulated and fixed by β-cyclodextrin, reducing odor release at the source. It is highly safe, does not irritate the skin, and is a commonly used functional ingredient in personal care deodorizing products.

16. Indoor and textile deodorizers (industrial/daily chemical)

Corresponding products: indoor deodorizers, refrigerator deodorizer boxes, shoe cabinet deodorizers, bathroom deodorizers, garbage deodorizers, textile deodorizing and finishing agents, pet product deodorizers, car deodorizers, etc.

Why it works: Odor molecules (ammonia, hydrogen sulfide, aldehydes, smoke, musty smell, etc.) in indoor and textile environments are encapsulated and adsorbed by the β-cyclodextrin cavity, achieving continuous deodorization rather than masking. It is highly safe and can be used for textile finishing and home cleaning.

17. Pesticide formulation encapsulation and sustained-release carriers (pesticide industry)

Corresponding products: insecticides, herbicides, fungicides, plant growth regulators, seed dressings, insect repellents, pesticide formulation adjuvants, etc.

Why it can be used for this purpose: β-cyclodextrin encapsulates the active ingredient of pesticides, which can improve their stability and water solubility, reduce volatilization and leaching losses, achieve slow release in the field to prolong efficacy, reduce dosage and toxicity exposure, and the EPA allows it to be used as an inert ingredient in non-food pesticide formulations.

18. Detergent and Cleaning Product Additives (Daily Chemical Industry)

Corresponding products: laundry detergent, laundry powder, fabric softener, dishwashing liquid, multi-purpose cleaner, aromatherapy cleaner, laundry fragrance beads, surface cleaning wipes, etc.

Why it works for this purpose: Fragrances, active enzymes, and bleaching ingredients in detergent formulas are easily volatile or interfere with each other. β-Cyclodextrin encapsulates fragrances to achieve slow-release fragrance retention during washing and wearing, while encapsulating dirt and odor molecules to enhance the cleaning and deodorizing effect and stabilize the active ingredients in the formula.

19. Wastewater Treatment and Environmental Adsorbent Materials (Environmental Protection Industry)

Corresponding products: wastewater treatment adsorbents, dyeing and printing wastewater treatment agents, organic pollutant removal agents, heavy metal ion adsorption materials, soil remediation agents, waste gas treatment materials, etc.

Why it can be used for this purpose: The cavity of β-cyclodextrin can adsorb and enrich organic pollutants (dyes, phenols, pesticide residues, polycyclic aromatic hydrocarbons) and odor substances in wastewater and soil. Its hydroxyl groups can chelate metal ions, making it a green and biodegradable adsorbent material for environmental remediation and restoration.

20. Chromatographic separation and chiral recognition carriers (scientific research/analytical industry)

Corresponding products: chromatographic stationary phases, chiral separation column packing materials, gas/liquid chromatography columns, molecular recognition materials, chemical sensors, analytical reagents, chiral resolution materials, etc.

Why it can be used for this purpose: The selective recognition ability of β-cyclodextrin cavities to different molecules and enantiomers makes it a classic chiral chromatographic stationary phase and molecular recognition material, used for enantiomer separation, isomer separation and sensing detection, and is an important tool in analytical chemistry and scientific research.

Summarize

β-Cyclodextrin (E459/betadex) is a cyclic oligosaccharide composed of seven glucose units. Its core structure is a cavity with an internal hydrophobic and external hydrophilic interface, enabling it to perform functions such as inclusion, solubilization, taste masking and debittering, flavor protection, antioxidant stabilization, sustained-release and controlled-release, selective removal, adsorption, and molecular recognition. It spans five major fields: food, cosmetics, industry, and scientific research. In food, it serves as a flavor carrier, flavor protectant, and encapsulating agent in health foods, preserving aroma, removing bitterness and cholesterol, protecting easily oxidized nutrients, and extending the shelf life of fruits and vegetables. In cosmetics, it encapsulates fragrances and active ingredients, achieving fragrance retention and deodorization. In industry, it acts as a deodorizer, pesticide slow-release carrier, detergent additive, and environmentally friendly adsorbent. In scientific research, it is a classic carrier for chromatographic chiral separation and supramolecular chemistry. Understanding its cavity inclusion principle explains why it can simultaneously achieve aroma preservation, taste masking, solubilization, stabilization, and removal.