[Modification and stability of ginsenoside Rg1PEG]

Area of Science:

• Pharmacology
• Drug Delivery
• Biochemistry

Background:

• Ginsenoside Rg1 is a key active component of ginseng with therapeutic potential.
• Ginsenoside Rg1 exhibits poor stability and rapid degradation in the acidic environment of the stomach.
• Improving the oral bioavailability and stability of ginsenoside Rg1 is crucial for its clinical application.

Purpose of the Study:

• To evaluate the in vitro stability of ginsenoside Rg1 before and after polyethylene glycol (PEG) modification in isolated rat stomachs.
• To compare the degradation rates of native ginsenoside Rg1 and PEG-ginsenoside Rg1 (PEG-Rg1) under simulated gastric conditions.

Main Methods:

• Standardized (SD) rats were fasted for 18 hours and divided into two groups: Rg1 and PEG-Rg1.
• Rg1 and PEG-Rg1 solutions were instilled into isolated rat stomachs and incubated at 37°C with oscillation.
• Ginsenoside Rg1 content was quantified at various time points using Ultra-Performance Liquid Chromatography (UPLC).

Main Results:

• Native ginsenoside Rg1 demonstrated poor stability, with only 26.8% remaining after 2 hours, indicating 73.2% degradation.
• PEG-ginsenoside Rg1 exhibited significantly enhanced stability, with 81.8% of Rg1 remaining after 2 hours, showing only 18.2% degradation.
• PEG modification markedly reduced the degradation of ginsenoside Rg1 in the rat stomach model.

Conclusions:

• Polyethylene glycol (PEG) modification effectively enhances the stability of ginsenoside Rg1 in the gastric environment.
• PEG-Rg1 overcomes the inherent poor stability and degradation issues of ginsenoside Rg1 in the stomach.
• This strategy holds promise for improving the oral delivery and therapeutic efficacy of ginsenoside Rg1.