Pharmacokinetic analysis on compatibility of Atractylodes macrocephala and Paeoniae radix herb pair ameliorates functional constipation model rats using microdialysis with ultra-performance liquid chromatography

Abstract

Background: In a previous study, we found that Atractylodes macrocephala and Paeoniae radix (AM-PR) was useful for the alleviation of functional constipation (FC). However, the precise mechanism underlying the compatibility between AM and PR in the treatment of FC remains uncertain. This study aims to analyze the pharmacokinetic differences in the active ingredients in the blood of rat models with FC when applied individually and in combination with AM-PR. It also seeks to compare the changes in the content of the active ingredient when applied individually and in combination with in vitro AM-PR, further in-depth investigation into its material foundation in terms of pharmacokinetics, as well as the composition of the substance.

Methods: Blood microdialysis samples were collected using microdialysis technology. These samples from rats with FC were compared after administration of AM, PR, and AM-PR. The concentration of the main active ingredients was determined using the Ultra Performance Liquid Chromatography-Tunable Ultraviolet (UPLC-TUV) method. The concentration of the main active ingredients of the decoction compatibility before and after combining AM-PR was also determined using the UPLC-TUV method.

Results: Our findings reveal that upon combination, the time to maximum concentration (T_max) of isochlorogenic acid A (ICA-A) and ataridolide II (ATR-II) T_max was prolonged, terminal elimination half-life (T_1/2) was reduced, and maximum plasma concentrations (C_max) increased. The T_max of ataridolide III (ATR-III) remained consistent, whereas its T_1/2 and C_max were significantly reduced. Conversely, for peoniflorin (PAE), T_max occurred sooner, T_1/2 was shortened, and C_max increased. The T_max for albiflorin (ALB) remained consistent, whereas T_1/2 and C_max witnessed significant increases. The area under the moment curve (AUMC) (0–t) and AUMC (0–∞) of PAE, ALB, ICA-A, ATR-II experienced an increase after AM-PR administration in rats, attributable to the heightened C_max. In comparison to individual herb administration, the T_max of ALB was advanced in combination, the T_max of PAE remained unchanged, and the T_max of ICA-A and ART-II was delayed, with an increased area under the concentration–time curve (AUC) (0–t), indicating enhanced C_max and bioavailability. Furthermore, the dissolution rates of PAE, ICA-A, and ATR-II significantly improved after compatibility.

Conclusions: This study partially clarifies the rationale and compatibility of AM-PR in treating FC and offers a new perspective on the pharmacokinetic interactions of AM-PR in FC treatment.

Keywords

Atractylodes macrocephala / microdialysis / Paeoniae radix / pharmacokinetics / UPLC-TUV

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