Antimicrobial resistance is currently one of the most serious challenges in global health. When bacteria that were previously treatable with antibiotics begin to evolve and become resistant to therapy, healthcare systems face a major threat to the effectiveness of treatments that have long been considered medical standards. Global health organizations even estimate that by 2050, antimicrobial resistance could cause up to ten million deaths annually if new solutions are not found.

One of the bacteria that has drawn significant attention in this context is Methicillin-resistant Staphylococcus aureus (MRSA)—a pathogen known for its high level of resistance to various antibiotics. MRSA belongs to a group of dangerous pathogens that frequently cause serious infections in hospitals as well as in community settings. This bacterium is also classified among the ESKAPE pathogens, a group of bacteria known for their remarkable ability to “escape” the effects of modern antibiotics.

In an effort to identify more effective and sustainable alternative therapies, a group of researchers consisting of Sri Amelia, Nenni Dwi Aprianti Lubis, Abdi Santoso, Alvin Ivander, and Yulia Putri conducted a study exploring the potential of herbal plants as natural antimicrobial agents. The study was published in the Journal of Medicinal and Pharmaceutical Chemistry Research under the title Inhibitory Effects of Alpinia galanga and Lawsonia inermis on Methicillin-Resistant Staphylococcus aureus: An In Vitro Study.

In this research, Sri Amelia played a crucial role in formulating the research concept, designing the experimental methodology, analyzing the results, and preparing the scientific manuscript. Her contribution reflects a systematic scientific approach to exploring the potential of local medicinal plants as solutions to the growing crisis of antibiotic resistance.

The study is grounded in a scientific premise that has gained increasing attention in global health: that traditional medicinal plants possess great potential as sources of new antimicrobial agents. In many developing countries, including Indonesia, the use of herbal plants has been part of traditional medical practice for centuries. It is even estimated that approximately 65–80 percent of the population in developing countries still uses herbal remedies as part of their healthcare.

Sri Amelia and the research team viewed this potential as a scientific opportunity worthy of systematic exploration. Rather than relying solely on empirical knowledge, the study aimed to experimentally evaluate whether local herbal plants exhibit real activity in inhibiting the growth of MRSA bacteria.

To address this question, the research employed an in vitro experimental study approach using several types of plants that have previously been reported in the scientific literature to possess antibacterial activity. These plants included galangal (Alpinia galanga), henna leaves (Lawsonia inermis), bamban (Donax canniformis), turmeric (Curcuma longa), as well as several other herbal plants commonly found in North Sumatra.

The research process began with the extraction of herbal materials using 96 percent ethanol as a solvent through the maceration method, a technique involving the soaking of plant materials in a solvent to extract their active compounds. This method was chosen because it can preserve the stability of various bioactive compounds present in plants. After the extraction process, the research team conducted phytochemical screening to identify the types of active compounds contained in each herbal extract. The analysis showed that all tested plants contained various important bioactive compounds, including alkaloids, flavonoids, saponins, tannins, and triterpenoids. These compounds are known to possess diverse biological mechanisms that can function as natural antimicrobial agents.

The next step was to test the ability of the plant extracts to inhibit the growth of MRSA bacteria. For this purpose, the study used the Kirby–Bauer disc diffusion method, a laboratory technique commonly employed to measure the antibacterial activity of a substance. In this method, small discs soaked with herbal extracts are placed on bacterial culture media, and the formation of inhibition zones is observed as an indicator of the extract’s ability to prevent bacterial growth.

The tests were conducted on two types of MRSA bacteria: the standard strain MRSA ATCC 49136 and two clinical isolates obtained from the microbiology laboratory of the Faculty of Medicine, Universitas Sumatera Utara. Vancomycin was used as a positive control, while dimethyl sulfoxide (DMSO) served as a negative control in the experiments. The results revealed notable findings. Among all the plants tested, galangal (Alpinia galanga) exhibited the strongest antibacterial activity against MRSA. The diameter of the inhibition zone produced by galangal extract reached 37.5 mm, which, according to CLSI criteria, falls within the category of high bacterial sensitivity.

Meanwhile, henna leaves (Lawsonia inermis) also demonstrated significant antibacterial activity, with inhibition zones reaching approximately 19.5 mm, categorized as a moderate level of inhibition against MRSA. These findings indicate that both plants have strong potential as sources of natural antimicrobial agents that can be further developed in subsequent research. According to Sri Amelia and the research team, the antibacterial activity of these herbal plants is closely related to the synergistic action of various bioactive compounds in inhibiting bacterial growth. For example, flavonoids are known to damage bacterial cell membranes and inhibit nucleic acid synthesis. These compounds can also suppress the activity of certain enzymes essential to bacterial metabolism.

In addition, saponins can increase bacterial cell membrane permeability, making cellular structures more susceptible to damage. Tannins are also known to disrupt the stability of bacterial cell walls and inhibit various critical metabolic processes within microbial cells. Alkaloids, on the other hand, are recognized for their role as efflux pump inhibitors—a mechanism commonly used by bacteria to expel antibiotics from within their cells. By inhibiting this mechanism, alkaloids can enhance the effectiveness of antibacterial activity against resistant bacteria. These scientific findings strengthen the hypothesis that the complex combination of bioactive compounds in herbal plants can exert strong antibacterial effects, even against bacteria that have developed resistance to conventional antibiotics.

For Sri Amelia, this research also underscores the importance of exploring Indonesia’s rich biodiversity as a source of innovation in the health sector. Herbal plants that have long been used in traditional medicine evidently possess scientific potential that can be developed into modern therapeutic resources. In the context of global health research, such an approach is becoming increasingly relevant. The development of plant-based drugs not only opens opportunities for discovering new antimicrobial agents but also supports the natural product drug discovery approach that is increasingly adopted in modern pharmaceutical research.

Beyond contributing to scientific understanding of the antibacterial activity of herbal plants, this study also provides a foundation for further research. Sri Amelia and the research team emphasize the need for additional studies to identify the specific active compounds responsible for the observed antibacterial effects. Further research is also required to determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of the plant extracts, as well as to evaluate their effectiveness in more complex biological models, including in vivo testing and pharmaceutical formulation development.

Through this research, Sri Amelia demonstrates how a scientific approach that integrates microbiology, pharmacy, and plant science can make meaningful contributions to addressing the global antibiotic resistance crisis. This work also reflects the active role of academics at Universitas Sumatera Utara in producing research that is not only academically relevant but also carries real implications for public health. In the landscape of modern health research, innovation often emerges at the intersection of traditional knowledge and rigorous scientific methodology. This study serves as an example of how the wealth of local medicinal plants can become a source of scientific inspiration in the search for solutions to increasingly complex global health challenges.

Through contributions such as this, Sri Amelia and the research team not only enrich the scientific literature in microbiology and pharmacy but also open pathways for the development of alternative therapies based on natural resources that are more sustainable and adaptive to the evolving dynamics of antimicrobial resistance in the future.