Inhibition Effect on Antibiotic Resistant Bacteria and Protosappanin B Content in A-Po-That Formula Extract and Stability Testing

Main Article Content

Thanakan Kitnithiprapha
Sumalee Panthong
Intouch Sakpakdeejaroen
Sumalee Kondo

Abstract

Introduction and Objectives: The 21stA-Po-That traditional drug formula exhibits antibacterial activity against many bacteria that cause diarrhea and its main chemical constituents are brazilin and gallic acid. But there have been no studies on its effects on antibiotic-resistant bacteria and its stability in inhibiting antibiotic-resistant bacteria, as well as its other chemical compounds. The objectives of the study were to examine the antibacterial effects of 21stA-Po-That extract against extended-spectrum beta-lactamase-producing Escherichia coli or ESBL E. coli, analyze its chemical composition and assess the stability of the extract under accelerated conditions.


Methods: Extraction of the A-Po-That remedy was performed using a water decoction method. Subsequently, the antibacterial activity of the extract was assessed by the broth microdilution assay, while the chemical composition was quantified using the HPLC approach. The A-Po-That remedy extract was examined for stability under accelerated conditions for 6 months and tested/analyzed for antibacterial activity and chemical compounds. 


Results: The 21stA-Po-That remedy extract was found to exhibit antibacterial activity against ESBL E. coli with minimum inhibitory concentration (MIC) values ranging from 0.625 to 2.5 mg/mL. Protosappanin B was the primary chemical constituent of the A-Po-That extract with a chemical concentration of 2.89±0.21%w/w. The stability testing revealed that the A-Po-That extract exhibited stability in terms of its antibacterial activity and a change in its protosappanin B content after 120 days of testing. However, there was no significant difference in the content of protosappanin B between day 180 and day 0.


Discussion: The 21stA-Po-That remedy extract effectively suppressed the growth of ESBL E. coli. However, the primary chemical compound identified was protosappanin B, which differs in contrast to what was previously reported. Seasonal and climatic changes may have an impact on the chemical composition of the remedy’s medicinal plant ingredients. Furthermore, the A-Po-That extract exhibited consistent antibacterial activity, but displayed different results in terms of chemical composition. The changes in moisture and temperature might be contributing to the changing chemical composition of the remedy.


Conclusions and recommendation: The findings indicate that the A-Po-That formula extract has the ability to inhibit ESBL E. coli growth with protosappanin B being identified as its main chemical compound. After undergoing stability testing for 180 days, the concentration of protosappanin B remained unchanged compared to day 0. However, the concentration of protosappanin B exhibited increased after 120 days. Thus, it is necessary to store A-Po-That extract in conditions of low temperature and low humidity to prevent any alteration of its chemical elements. Before performing any efficacy study of the A-Po-That formula in patients, it is necessary to perform a toxicity study first.

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