Abstract
To study the stability of ginsenoside Rg1 before and after being modified by PEG (PEG-Rg1) in isolated rat stomachs. SD rats, after 18 h of fasting, were randomly divided into the Rg1 group and the PEG-Rg1 group. Rg1 stomach perfusion fluid and PEG-Rg1 infusion fluid were accurately extracted and injected into their stomachs in vitro, with oscillation at 37 degrees C. Samples were taken in different time points and contents of ginsenoside Rg1 were determined by UPLC to observe and compare the stability of ginsenoside Rg1 and PEG-Rg1 in rat stomachs in vitro. Rg1 in rat stomachs showed poor stability, Rg1 was measured to be 26.8% in 2 h, with degradation of 73.2%. Its stability in PEG-Rg1 was improved in rat stomachs, Rg1 was measured to be 81.8% in 2 h, with degradation of only 18.2%. PEG-modified ginsenoside Rg1 can enhance the stability of ginsenoside Rg1 in stomach and improve degradation and poor stability of ginsenoside Rg1 in stomach.
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