Optimization of antibacterial activity by Gold-Thread (Coptidis Rhizoma Franch) against Streptococcus mutans using...

Area of Science:

• Pharmacology and Microbiology
• Natural Product Chemistry

Background:

• Streptococcus mutans is a primary cause of dental caries.
• Gold-Thread (Coptis chinensis) possesses known antimicrobial properties.
• Optimizing extraction methods is crucial for maximizing the efficacy of natural compounds.

Purpose of the Study:

• To determine the optimal extraction conditions for Gold-Thread to enhance its antibacterial activity against Streptococcus mutans.
• To investigate the influence of extraction temperature, time, and ethanol concentration on antibacterial efficacy.

Main Methods:

• Utilized the Evolutionary Operation-Factorial (EVOP-Factorial) design technique for optimization.
• Systematically varied extraction parameters including temperature, time, and ethanol concentration.
• Quantified antibacterial activity against Streptococcus mutans by measuring bacterial population reduction.

Main Results:

• Higher extraction temperatures (R2 = -0.79) and longer extraction times (R2 = -0.71) significantly increased antibacterial activity.
• Ethanol concentration in the extraction solvent showed minimal impact on antibacterial activity (R2 = -0.12).
• Optimal conditions identified: 80°C extraction temperature, 26 hours extraction time, and 50% ethanol concentration, resulting in a decrease from 6.110 to 4.125 logCFU/ml of S. mutans.

Conclusions:

• The EVOP-Factorial technique effectively identified optimal extraction parameters for Gold-Thread's antibacterial effects.
• Extraction temperature and time are key factors influencing Gold-Thread's efficacy against Streptococcus mutans.
• The study provides a scientifically validated method for preparing Gold-Thread extracts with potent antibacterial properties for potential use in oral hygiene products.