What Is The Difference Between Hydroxypropyl Gamma Cyclodextrin And Hydroxypropyl Beta Cyclodextrin?

what is Hydroxypropyl gamma cyclodextrin?

Hydroxypropyl gamma cyclodextrin (HP-γ-CD) is a cyclic oligosaccharide derivative obtained by chemically modifying γ-cyclodextrin, which has unique structural and performance advantages.

Structural features:

Main structure: a ring molecule (γ-CD) composed of 8 glucose units, with a cavity diameter ≥ 9.5Å (30% larger than β-CD).
Modification group: the hydroxyl group on the glucose unit is replaced by a hydroxypropyl group (-CH₂CHOHCH₃), which significantly improves water solubility and safety.

Hydroxypropyl Gamma Cyclodextrin Benefits:

1. Solubility:
Its solubility is very good, and high-concentration formula is very feasible.

2. Hemolysis:

Extremely low, and highly safe for intravenous injection.

3. Inclusion capacity:

Suitable for large molecule drugs, and hydroxypropyl gamma cyclodextrin powder can be used as a new type of biological drug delivery carrier.

4. Toxicity:

Low, in line with FDA/EMA pharmaceutical excipient standards.

application:

Macromolecule drug inclusion: adapting to large molecules such as monoclonal antibodies and peptides.
Enhancing the delivery of fat-soluble drugs: such as paclitaxel and vitamin D₃.
Reducing injection irritation: Reducing muscle pain of non-steroidal anti-inflammatory drugs.
Cosmetic solubilization: stabilizing essential oils and unstable active ingredients in cosmetics.

Hydroxypropyl Gamma Cyclodextrin VS. Hydroxypropyl Beta Cyclodextrin(Hp-β-CD):

Contrast	Hp-γ-CD	hpbcd	Difference
Drug carrier	Macromolecular carrier	Small and medium molecule drugs	γ-CD can include larger molecules
Inclusion constant	Lower	Higher	β-CD binds to small and medium molecules more tightly, while γ-CD releases them faster
Biocompatibility	Very low risk of nephrotoxicity	High doses may cause renal tubular cavitation	γ-CD is more suitable for long-term use
Production cost	Higher	Lower	β-CD is more suitable for low-cost preparations

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