Description

Hydroxypropyl cyclodextrin is a modified derivative of cyclodextrin, a cyclic oligosaccharide composed of glucose units. It is obtained through the chemical modification of cyclodextrin with hydroxypropyl groups. This modification enhances the solubility and stability of cyclodextrin, making it useful in various pharmaceutical, cosmetic, and food applications. Hydroxypropyl cyclodextrin is primarily used as a solubilizing and stabilizing agent to improve the solubility and bioavailability of active ingredients.

Chemical Composition and Structure

The chemical composition of hydroxypropyl cyclodextrin includes:

Cyclodextrin: A cyclic oligosaccharide composed of glucose units with a general molecular formula of (C6H10O5)n.
Hydroxypropyl Groups: Chemical groups added to the cyclodextrin to improve its solubility and stability.

The structure of hydroxypropyl cyclodextrin is characterized by:

Cyclic Structure: Cyclodextrin forms a ring structure composed of six, seven, or eight glucose units, known respectively as α-, β-, and γ-cyclodextrins.
Hydroxypropyl Groups: Attached to the cyclic ring, these groups enhance the solubility and stability of cyclodextrin.
Molecular Formula: The molecular formula varies depending on the number of glucose units and the degree of substitution with hydroxypropyl groups.

Physical Properties

Hydroxypropyl cyclodextrin typically appears as a white or colorless powder. Its physical properties include:

Boiling Point: Not directly measurable as cyclodextrin decomposes before boiling.
Melting Point: Not specifically defined, but it is generally solid at room temperature.
Solubility: It is soluble in water due to modification with hydroxypropyl groups, improving solubility compared to unmodified cyclodextrin.

Production Process

The production process for hydroxypropyl cyclodextrin involves:

Chemical Modification: Cyclodextrin is treated with propylene oxide or another reagent to introduce hydroxypropyl groups onto the cyclic ring.
Reaction Conditions: The reaction is conducted under controlled temperature and pH conditions to optimize the modification efficiency.
Purification: Following the reaction, the product is purified using techniques such as filtration and centrifugation to remove impurities and unreacted reagents.
Characterization: The final product is characterized using analytical methods such as chromatography and spectroscopy to confirm its purity and structure.

Applications

Hydroxypropyl cyclodextrin is used in:

Pharmaceuticals: As a solubilizing agent to improve the solubility and bioavailability of drugs.
Cosmetics: In skincare and haircare products to enhance the stability and solubility of active ingredients.
Food Industry: As a stabilizer and carrier for flavorings and active ingredients.
Chemical Industry: In the formulation of chemical products to improve the solubility of insoluble compounds.

Safety

Hydroxypropyl cyclodextrin is generally considered safe for use in pharmaceuticals, cosmetics, and food products when used in recommended concentrations. It is important to adhere to usage guidelines and handling procedures to avoid adverse effects. Proper handling and storage are essential to ensure safety and effectiveness.

Environmental and Safety Considerations

The production of hydroxypropyl cyclodextrin should follow environmentally responsible practices to minimize ecological impact. Efficient synthesis and purification processes are crucial to reduce waste. Proper labeling and handling are important to ensure safe use in its various applications.

INCI


Fragrance. It plays a very important role in the formulation of cosmetic products as it provides the possibility of enhancing, masking or adding fragrance to the final product, increasing its marketability. It is able to create a perceptible pleasant odour, masking a bad smell. The consumer always expects to find a pleasant or distinctive scent in a cosmetic product.

Skin conditioning agent. It is the mainstay of topical skin treatment as it has the function of restoring, increasing or improving skin tolerance to external factors, including melanocyte tolerance. The most important function of the conditioning agent is to prevent skin dehydration, but the subject is rather complex and involves emollients and humectants that can be added in the formulation.
Synonyms:

CAS: 128446-33-3 128446-35-5