The choice of manufacturing method matters as much as the material itself. Conventional nanoparticle synthesis typically relies on toxic reducing chemicals, high energy input, and multi-step procedures that raise environmental and biocompatibility concerns. Green synthesis sidesteps these problems by using plant extracts, microbes, or purified biomolecules to reduce metal ions and stabilize the resulting particles. In this case, the researchers boiled dried Rosa damascena leaves in water at 80 degrees Celsius for 30 minutes, filtered the extract, and then mixed it with solutions of nickel nitrate and sodium selenite. After adjusting the pH to roughly 10 with sodium hydroxide and stirring for two hours, a greenish precipitate formed. The solid was washed, dried, and calcined at 400 degrees Celsius for two hours to yield crystalline selenium-doped nickel oxide nanoparticles.

The rose extract is not merely a benign solvent; it is the chemical engine of the reaction. Gas chromatography-mass spectrometry revealed that the extract is dominated by phenylethyl alcohol at 30.25 percent, eugenol at 10.48 percent, anethole at 9.59 percent, and caryophyllene at 5.07 percent, alongside monoterpenes such as p-cymene and D-limonene. High-performance liquid chromatography confirmed a rich phenolic and flavonoid inventory, with the flavonoid apigenin accounting for 62.59 percent of identified compounds, followed by quercetin, rutin, hesperidin, gallic acid, ferulic acid, and quinic acid. These molecules carry multiple hydroxyl and conjugated groups that donate electrons to reduce metal ions, while functional groups such as hydroxyl and carboxyl moieties cap the particle surfaces and regulate growth. The same phytochemicals are themselves biologically active, which means the finished nanoparticles carry a built-in layer of therapeutic chemistry.

A battery of characterization techniques confirmed that the synthesis worked as intended. Ultraviolet-visible spectroscopy showed a strong absorption band near 240 nanometers and a shoulder around 436 nanometers, and a Tauc plot analysis yielded an optical band gap of approximately 3.12 electronvolts, notably lower than the 3.6 to 4.0 electronvolts typical of pure nickel oxide. That narrowing is a chemical fingerprint of selenium doping, which introduces localized defect states and oxygen vacancies into the nickel oxide lattice. Fourier-transform infrared spectroscopy detected a characteristic nickel-oxygen stretching band near 626 per centimeter, together with peaks from the plant-derived organic coating. X-ray diffraction indexed the particles to face-centered cubic nickel oxide, with no separate crystalline selenium phase detected, indicating that selenium was incorporated into the lattice or dispersed in an amorphous state rather than forming its own crystals.

Electron microscopy painted a picture of quasi-spherical particles averaging 41.8 plus or minus 20 nanometers in diameter, though the distribution was fairly broad, a common consequence of phytochemical-mediated nucleation. Energy-dispersive X-ray spectroscopy confirmed the presence of nickel, oxygen, and selenium, and elemental mapping showed the three elements uniformly distributed throughout the sample, supporting genuine doping rather than surface segregation. Dynamic light scattering told a more complicated story: the hydrodynamic diameter in water was 285.3 nanometers with a polydispersity index of 0.517, reflecting an adsorbed layer of plant molecules and some aggregation. The zeta potential of plus 15.1 millivolts indicated moderate colloidal stability. Thermogravimetric analysis traced the loss of adsorbed water below 200 degrees Celsius and the decomposition of residual phytochemicals between 200 and 350 degrees Celsius, while BET measurements revealed a low surface area of 0.753 square meters per gram but a mesoporous structure with an average pore diameter of 26.96 nanometers.

The anticancer results were the most striking. In MTT assays, the nanoparticles killed HeLa cervical cancer cells with an IC50 of 239.4 micrograms per milliliter, while normal Vero cells required 407.9 micrograms per milliliter to reach the same level of toxicity, a selectivity index of roughly 1.7. Cancer cells are thought to be more vulnerable because they already operate at elevated levels of intracellular reactive oxygen species, so additional oxidative stress from selenium and nickel oxide pushes them past a survival threshold that healthy cells can still tolerate. Flow cytometry using Annexin V and propidium iodide staining showed that viable HeLa cells plummeted from 96.2 percent to 44.5 percent after treatment, while early apoptotic cells rose from zero to 32.6 percent and late apoptotic cells to 20.7 percent, confirming that programmed cell death, not necrosis, was the dominant outcome.

Cell cycle analysis added a second mechanism. Untreated HeLa cells were mostly in S phase, but treated cells accumulated dramatically in the G2/M phase, rising from 6.9 percent to 66.5 percent, with the G1 population vanishing entirely. This arrest suggests the nanoparticles damage DNA or interfere with checkpoint machinery, preventing cells from entering mitosis. Quantitative real-time PCR then connected the dots at the molecular level: expression of the executioner caspase-3 rose 3.2-fold and the pro-apoptotic protein BAX rose 2.8-fold, while the anti-apoptotic Bcl-2 fell to 0.42-fold of control levels. The resulting BAX-to-Bcl-2 ratio increased 6.67-fold, a classic signature of the intrinsic mitochondrial apoptotic pathway being switched on.

On the microbial front, the nanoparticles showed broad-spectrum activity against Pseudomonas aeruginosa, Staphylococcus aureus, and Escherichia coli, with inhibition zones between 15.56 and 18.4 millimeters, minimum inhibitory concentrations of 200 to 400 micrograms per milliliter, and bactericidal concentrations of 200 to 800 micrograms per milliliter. Pseudomonas aeruginosa was the most susceptible, with matching MIC and MBC values of 200 micrograms per milliliter, while the thick peptidoglycan wall of Staphylococcus aureus offered comparatively more resistance. Biofilm assays showed concentration-dependent disruption, peaking at 68.79 percent inhibition for S. aureus, 55.03 percent for P. aeruginosa, and 52.89 percent for E. coli at 1000 micrograms per milliliter. Protein leakage assays quantified membrane damage at up to 54.64 percent, and transmission electron microscopy captured treated bacteria with ruptured envelopes and leaking cytoplasm.

Perhaps most intriguing for the era of antibiotic resistance, the nanoparticles acted as anti-virulence agents. At half the inhibitory concentration, they suppressed key Pseudomonas virulence genes, cutting lasB expression to 55.40 percent of control levels, algD to 46.36 percent, and toxA to 41.28 percent. Because lasB encodes elastase, a tissue-damaging enzyme, algD drives alginate production for biofilm formation, and toxA controls toxin secretion, silencing these genes disarms the pathogen without necessarily killing it, a strategy that exerts weaker selective pressure for resistance than conventional bactericidal drugs. The particles also showed moderate antioxidant activity, with DPPH and ABTS radical-scavenging IC50 values of 478.18 and 640.03 micrograms per milliliter respectively, and inhibited the carbohydrate-digesting enzymes alpha-amylase and alpha-glucosidase with IC50 values of 481.05 and 232.52 micrograms per milliliter, the latter suggesting possible relevance to glycemic control.

The authors are careful to frame these findings as a promising beginning rather than a therapeutic endpoint. All experiments were conducted in vitro, and the nanoparticles’ moderate colloidal stability and partial aggregation could complicate formulation. Future work will need to verify reactive oxygen species generation and mitochondrial depolarization directly, test the particles in animal models, assess long-term biosafety, and explore whether they can synergize with existing antibiotics. Still, the study demonstrates that a simple aqueous extract of rose leaves can orchestrate the creation of a doped metal oxide nanomaterial with selective anticancer action, membrane-rupturing antibacterial power, gene-silencing anti-virulence effects, and antioxidant chemistry, all from a green, low-cost, and potentially scalable process. If subsequent in vivo studies hold up, phyto-mediated selenium-doped nickel oxide nanoparticles could join the growing arsenal of multifunctional nanomaterials aimed at two of medicine’s toughest targets at once.

Subject of Research: Green synthesis of selenium-doped nickel oxide nanoparticles and their anticancer and antimicrobial mechanisms

Article Title: Green-synthesized selenium-doped nickel oxide nanoparticles: Biological activities and mechanistic insights into anticancer and antimicrobial effects

Article References: Aljarba, N. H., Aldayel, M. F., AlMotwaa, S. M., Al-Otaibi, W. A., & Soliman, M. K. Y. (2026). Green-synthesized selenium-doped nickel oxide nanoparticles: Biological activities and mechanistic insights into anticancer and antimicrobial effects. Journal of Saudi Chemical Society, 30(4), Article 47. https://doi.org/10.1007/s44442-026-00097-3

Image Credits: AI Generated

DOI: 10.1007/s44442-026-00097-3

Keywords: green synthesis, selenium-doped nickel oxide, nanoparticles, Rosa damascena, anticancer, apoptosis, antibacterial, antibiofilm, anti-virulence, antioxidant, enzyme inhibition, HeLa cells

The platform was created using electrospinning, a technique in which a polymer solution is subjected to a high electric field and drawn into continuous fibers that collect as a soft, porous mat. The researchers, led by Divya Mathew, Benny Thomas, Sudheep Nagamangalam and Radhakrishnan Edayileveettil Krishnankutty, systematically optimized the polymer concentration, the amount of drug loaded into the spinning solution, and the electrospinning parameters themselves. The goal was to produce fibers that were uniform and free of the bead-like defects that plague poorly tuned electrospinning. Their optimized mats consisted of bead-free poly(vinyl alcohol) nanofibers with an average diameter of roughly 250 nanometers, fine enough to create an enormous surface area for contact with infected tissue while remaining robust enough to handle.

One of the most striking numbers in the study is the entrapment efficiency: the fibers captured 88.6 percent of the amphotericin B, give or take about two percent. That matters because amphotericin B is both expensive and toxic, and any drug that leaks out or fails to incorporate into the carrier is wasted payload that could cause collateral damage. To understand how the drug was held within the polymer, the team turned to Fourier Transform Infrared spectroscopy, which revealed molecular-level interactions between amphotericin B and the poly(vinyl alcohol) matrix through hydrogen bonding. Transmission Electron Microscopy confirmed that the drug was dispersed homogeneously throughout the fiber network rather than clumped into crystals, a detail that helps explain the smooth, predictable release behavior that followed.

The physical character of the mats proved equally important to their function. The optimized fibers showed improved mechanical strength, a moderate hydrophilicity reflected in a water contact angle of about 50 degrees, and an excellent balance between swelling and moisture retention. In practical terms, when the mat is placed on moist skin or mucosal tissue, it hydrates gradually without dissolving too quickly or drying out, maintaining the conditions needed for controlled drug diffusion over an extended period. The researchers also tracked how the material degrades, finding a gradual weight loss of 28.6 percent after fourteen days. That slow biodegradation profile means the mat remains structurally functional throughout the treatment window rather than falling apart prematurely.

To quantify how the drug escapes the matrix, the team fitted their release data to established mathematical models of drug diffusion. The kinetics matched the Korsmeyer–Peppas and Peppas–Sahlin models best, with coefficients of determination above 0.98. This fit pointed to a non-Fickian diffusion mechanism, meaning drug release is governed not simply by molecular diffusion through the polymer but by a combination of diffusion and the relaxation of the polymer chains themselves as they swell. For a topical delivery system, that coupling is advantageous: it smooths out the release profile, avoiding the sharp burst of drug that can irritate tissue and instead providing the sustained exposure needed to suppress fungal regrowth between applications.

Safety was assessed with a battery of cytocompatibility and blood-contacting assays. Three different human cell lines—normal human dermal fibroblasts, keratinocytes of the HaCaT line, and HEK 293 cells—all maintained viability above 80 percent when exposed to the material, and hemolysis testing showed red blood cell rupture remained below five percent. Those thresholds are meaningful benchmarks in biomaterials research, suggesting the mats would not damage the skin cells they are meant to protect nor harm blood components if used on wound beds. For a drug as harsh as amphotericin B, whose systemic use is shadowed by nephrotoxicity, confining it to a local, well-tolerated depot is a strategy aimed squarely at keeping the drug’s benefits while leaving its systemic toxicity behind.

The antifungal performance was tested against three clinically relevant organisms: Candida albicans, the yeast responsible for most mucocutaneous candidiasis, and two filamentous fungi, Aspergillus niger and Aspergillus flavus. The mats produced sustained yet potent inhibition of all three. Just as importantly, the researchers evaluated activity against biofilms—the organized microbial communities encased in a protective extracellular matrix that make infections on catheters, wounds, and mucosal surfaces so difficult to eradicate. Biofilm cells are famously tolerant of antifungals that readily kill their free-floating planktonic counterparts. The amphotericin B-loaded mats cut the metabolic activity and biomass of fungal biofilms by roughly 60 percent compared with untreated controls, a substantial reduction that suggests the platform could help break the cycle of persistent, treatment-resistant surface infections.

The broader significance of the work lies in how it reframes an old drug for a persistent clinical problem. Amphotericin B has been in use for some sixty years, and while lipid formulations such as AmBisome have reduced its toxicity for systemic treatment, options for localized delivery to skin, mucosa, and wounds remain limited. Nanofiber mats offer a distinctive combination of properties for that niche: they conform to irregular surfaces, their porosity supports moisture balance, and their structure can be tuned to control release kinetics. Because poly(vinyl alcohol) is water-soluble, biocompatible, and already familiar in biomedical applications such as wound dressings, the barrier to translating the platform is arguably lower than for more exotic carrier chemistries.

The authors suggest the system is a promising localized antifungal delivery strategy for mucocutaneous and wound-associated infections, offering prolonged drug release, enhanced biocompatibility, and reduced toxicity in a single material. Much work remains before such a mat could reach patients—scale-up of electrospinning, in vivo efficacy studies, and regulatory evaluation all lie ahead. But the study demonstrates, with careful characterization at every step, that a humble polymer spun into nanofibers can tame one of medicine’s most toxic antifungals and turn it into a steady, localized weapon against the fungi and biofilms that resist conventional treatment. In an era of rising antifungal resistance, giving established drugs new delivery formats may be one of the most practical paths forward.

Subject of Research: Electrospun poly(vinyl alcohol) nanofiber mats for sustained topical delivery of amphotericin B with enhanced antifungal and antibiofilm efficacy

Article Title: Electrospun poly(vinyl alcohol) nanofiber mats as a biocompatible platform for sustained topical delivery of Amphotericin B with enhanced antifungal and antibiofilm efficacy

Article References: Mathew, D., Thomas, B., Nagamangalam, S., & Krishnankutty, R. E. (2026). Electrospun poly(vinyl alcohol) nanofiber mats as a biocompatible platform for sustained topical delivery of Amphotericin B with enhanced antifungal and antibiofilm efficacy. Polymer Bulletin, 83(11), Article 638. https://doi.org/10.1007/s00289-026-06681-2

Image Credits: AI Generated

DOI: 10.1007/s00289-026-06681-2

Keywords: Amphotericin B, poly(vinyl alcohol), electrospun nanofibers, sustained drug release, antifungal, antibiofilm, Candida albicans, Aspergillus, biocompatibility, drug delivery, wound infections, Korsmeyer–Peppas

The screening process began with a broad comparison of essential oils extracted from different plant species, each tested against three clinically significant microorganisms: the bacterium Staphylococcus aureus, the bacterium Escherichia coli, and the yeast Candida albicans. These three organisms represent the classic spectrum of wound pathogens, spanning Gram-positive bacteria, Gram-negative bacteria, and fungi, and any candidate material that cannot suppress all three is unlikely to perform reliably in a contaminated wound bed. After this initial round of testing, two oils clearly separated themselves from the pack: the essential oil of black pepper, Piper nigrum, and that of a juniper species, Juniperus rigida. Both oils had previously been valued in traditional medicine systems, but this study quantified their activity with modern microbiological precision.

The numbers behind the two finalists tell a compelling story. Piper nigrum essential oil achieved minimum inhibitory concentrations, or MICs, of just 0.125 to 0.25 percent by volume across the tested organisms, significantly lower than the 0.25 to 0.5 percent range recorded for Juniperus rigida, a difference the authors report as statistically significant. When the oils were applied at their MIC in time-kill assays, Piper nigrum produced reductions of at least three log10 colony-forming units per milliliter, meaning the microbial populations were cut by a factor of a thousand or more. Such reductions are considered bactericidal rather than merely bacteriostatic, an important distinction for a dressing intended to actively clear infection rather than simply slow microbial growth.

Biofilms, however, are the true fortress of chronic wound infections. Within these self-produced matrices of extracellular polymeric substances, bacteria become up to a thousand times more tolerant of antibiotics and disinfectants than their free-floating counterparts. The researchers therefore measured how well the two oils could prevent biofilms from forming and how effectively they could eradicate established ones. Piper nigrum once again outperformed its competitor, with a minimum biofilm inhibitory concentration for 50 percent inhibition of 0.25 percent compared with 0.5 percent for Juniperus rigida, and a minimum biofilm eradication concentration of 1.0 percent versus 2.0 percent. The authors note these differences were statistically significant, reinforcing black pepper oil’s position as the stronger all-around candidate.

Identifying potent oils, however, is only half the challenge. Essential oils are volatile, hydrophobic mixtures that evaporate quickly and can irritate tissue if applied directly, so delivering them to a wound requires a compatible carrier. The team turned to a hydrogel film made from carboxymethyl cellulose and polyvinyl alcohol, two well-established, biocompatible polymers. Carboxymethyl cellulose contributes a polysaccharide backbone that supports moisture retention, while polyvinyl alcohol lends mechanical strength and film-forming ability. When the selected essential oils were incorporated into this CMC-PVA matrix, the resulting films retained their antimicrobial punch, producing inhibition zones of 18.2 plus or minus 0.8 millimeters against Staphylococcus aureus and 16.1 plus or minus 0.7 millimeters against Candida albicans, confirming that the polymer environment did not neutralize the oils’ bioactivity.

The physical characterization of the films reveals why this particular polymer combination suits wound care so well. The films were transparent with only a mild yellow tint, a color difference score below six, which would allow clinicians to visually inspect the wound without removing the dressing. Their hydrophilic surfaces, measured by water contact angles below fifty degrees, paired with a high swelling capacity of roughly 180 plus or minus 8 percent, position them to absorb the copious exudate that characterizes infected and chronic wounds while maintaining a moist healing environment. Water vapour permeability, ranging from 1.8 times 10 to the negative ninth to 2.7 times 10 to the negative ninth grams per millimeter per square meter per day per kilopascal, sits in a range that allows the wound to breathe without drying out, a balance long recognized as essential for optimal tissue repair.

Spectroscopic and microscopic analyses confirmed that the oils had been genuinely integrated into the films rather than simply sitting on the surface. Fourier-transform infrared spectroscopy revealed new carbon-oxygen double bond and carbon-oxygen single bond absorption bands in the EO-loaded films, chemical signatures attributable to the oil constituents. Scanning electron microscopy showed that oil incorporation increased surface roughness and introduced microporosity, an effect most pronounced at the 1 percent oil concentration. That microporous architecture is more than cosmetic: pores can facilitate gas exchange and provide sites for controlled release of the antimicrobial compounds, while a rougher topography may also influence how cells interact with the dressing surface during tissue regeneration.

Beyond fighting microbes, the study addressed the oxidative stress that sabotages healing in chronic wounds. Inflammatory wound environments are saturated with reactive oxygen species that damage newly formed tissue, so an antioxidant dressing could meaningfully accelerate repair. In DPPH radical-scavenging assays, the Piper nigrum-loaded films neutralized 65 plus or minus 3 percent of the radical species, while the Juniperus rigida films achieved 50 plus or minus 4 percent. Both figures indicate substantial antioxidant capacity embedded directly in the dressing material. Equally important, biocompatibility testing with Vero cells demonstrated cell viability above 85 percent for the films, suggesting that the concentrations of oil needed for antimicrobial action do not compromise the living tissue the dressing is meant to protect.

The authors conclude that both Piper nigrum and Juniperus rigida essential oils exhibit strong antimicrobial, antibiofilm, and antioxidant activities, with black pepper oil consistently demonstrating superior efficacy across the statistical comparisons. By embedding these oils in carboxymethyl cellulose-polyvinyl alcohol hydrogel films and showing that bioactivity and favorable physicochemical properties survive the fabrication process, the team has laid the groundwork for a new class of bioactive dressings aimed at infected wounds and wounds compromised by oxidative stress. Much work remains before such dressings reach clinical use, including testing in more complex wound models and eventually in patients, but the study offers a vivid example of how traditional plant remedies, when put through rigorous modern evaluation and combined with polymer engineering, can yield genuinely multifunctional medical materials. In an era when antibiotic options are narrowing, a transparent film spun from kitchen pepper and wild juniper is a reminder that some of the most powerful tools against infection may still come from plants.

Subject of Research: Screening plant essential oils for incorporation into CMC-PVA hydrogel films as multifunctional antimicrobial wound dressings

Article Title: Screening of plant essential oils identifies Piper nigrum and Juniperus rigida for incorporation into carboxymethyl cellulose-polyvinyl alcohol hydrogel films as potential multifunctional wound dressings

Article References: Perera, V., Tang, M., Li, J., Perera, N., Perera, R., Wickramaratne, M. N., & Yang, Y. (2026). Screening of plant essential oils identifies Piper nigrum and Juniperus rigida for incorporation into carboxymethyl cellulose-polyvinyl alcohol hydrogel films as potential multifunctional wound dressings. BMC Complementary Medicine and Therapies. https://doi.org/10.1186/s12906-026-05560-7

Image Credits: AI Generated

DOI: 10.1186/s12906-026-05560-7

Keywords: essential oils, Piper nigrum, Juniperus rigida, hydrogel films, wound dressing, antimicrobial activity, antibiofilm, antioxidant, carboxymethyl cellulose, polyvinyl alcohol, antimicrobial resistance, biocompatibility

Researchers led by Nadarajan Viju of AMET University in Chennai, together with colleagues at Smykon Biotech and King Abdulaziz University, took a genomics-first approach to antifouling discovery. Rather than screening crude bacterial extracts, they mined the whole genomes of 30 marine bacteria belonging to the genera Pseudovibrio, Pseudomonas and Bacillus, all retrieved from the NCBI GenBank database. Using the open-source gene mining platform AntiSMASH, they mapped the biosynthetic gene clusters, or BGCs, the sets of genes that encode the enzymatic machinery for producing secondary metabolites. Each genome carried between 5 and 17 such clusters, yielding 278 clusters in total across the 30 organisms analysed.

The clusters fell into familiar categories: non-ribosomal peptide synthetases accounted for 28 percent, ribosomally synthesized and post-translationally modified peptides for 15 percent, terpenes for 11 percent, polyketide synthases for 9 percent, NRPS-PKS hybrids for 5 percent, siderophores for 6 percent, and a mixed bag of other clusters for the remaining 26 percent. Every species produced its own characteristic repertoire, with Pseudovibrio strains predicted to make compounds such as pyoverdin, rimosamide, prodigiosin and pseudaminic acid, Pseudomonas strains predicted to yield viscosin, pyoluteorin, mitomycin and ectoine among others, and Bacillus strains carrying genes for surfactin, bacillaene, difficidin, bacilysin and lichenysin, to name only a few.

But one compound stood out for its ubiquity. Fengycin, a cyclic lipopeptide encoded by a 22,502-base-pair non-ribosomal peptide synthetase cluster, was predicted in 26 of the 30 genomes, or 86.66 percent of all strains analysed. It was present in every one of the ten Pseudovibrio genomes, in 90 percent of the Pseudomonas genomes and in 70 percent of the Bacillus genomes. The authors argue that this broad distribution suggests fengycin acts as a conserved ecological trait, a chemical weapon that helps its producers compete for space and nutrients, colonize surfaces and survive in densely populated marine biofilms. In other words, the compound may represent a chemical defence strategy honed by evolution in exactly the kind of surface-bound microbial communities that kick off biofouling.

To test whether fengycin could plausibly block fouling at the molecular level, the team turned to structure-based virtual screening. They docked fengycin, obtained from the PubChem database, against six target proteins retrieved from the Protein Data Bank: the penicillin-binding protein of Acinetobacter baumannii and the lanosterol 14-alpha demethylase of Candida albicans as antimicrobial targets; a bacterial cell surface protein and the acyl-homoserine lactone synthase LasI, a quorum-sensing enzyme, as antibiofilm targets; and the barnacle cement protein and the mussel proximal thread matrix protein, which mediate larval adhesion, as antifouling targets. The docking was performed in PyRx using AutoDock Vina with an exhaustiveness value of eight, generating nine binding poses per ligand, with penicillin G, fluconazole and the commercial biocide DCOIT serving as reference ligands.

The results were striking. Fengycin achieved predicted binding affinities well ahead of every reference compound at every target. Against the penicillin-binding protein it scored minus 11.4 kilocalories per mole, compared with minus 6.7 for DCOIT. Against the fungal lanosterol demethylase it reached minus 13.3 kilocalories per mole, far beyond fluconazole’s minus 5.2. Its scores against the bacterial cell surface protein, the AHL synthase LasI, the barnacle cement protein and the mussel byssus protein were minus 15.3, minus 14.0, minus 14.2 and minus 13.1 kilocalories per mole respectively, while DCOIT managed only minus 7.3, minus 6.1, minus 5.5 and minus 5.61. Triplicate docking runs showed standard deviations below 0.5 kilocalories per mole, and redocking validation returned root-mean-square deviation values below the accepted threshold of 2.0 angstroms, confirming that the protocol reliably reproduced known binding orientations.

Visualization of the ligand-receptor complexes in PyMOL and BIOVIA Discovery Studio Visualizer explained the affinity. Fengycin formed extensive networks of polar and non-polar contacts: hydrogen bonds with residues such as GLU67 and LYS137 in the penicillin-binding protein, ARG381 in the fungal demethylase, SER374, SER520 and THR662 in the cell surface protein, HIS399 in LasI, GLN165 and GLU192 in the barnacle cement protein, and multiple residues in the mussel thread matrix protein, alongside dense hydrophobic contacts throughout each pocket. The researchers attribute this versatility to fengycin’s amphiphilic architecture, a rigid cyclic peptide ring fused to a hydrophobic beta-hydroxy fatty acid chain. The ring supplies multiple hydrogen bond donors and acceptors while limiting entropic penalties on binding, and the lipid tail drives van der Waals interactions within non-polar regions, allowing the molecule to engage diverse targets simultaneously.

The computational findings dovetail with decades of experimental literature on fengycin’s bioactivity. Studies have documented its antifungal action against Fusarium moniliforme, Botrytis cinerea and Magnaporthe grisea, its antibacterial effects against Xanthomonas and Pseudomonas pathogens, and, notably, its ability to disrupt quorum sensing in Staphylococcus aureus, a result reported in Nature in 2018 that aligns closely with the strong predicted interaction between fengycin and the quorum-sensing enzyme LasI in the present study. Because biofilms serve as settlement cues for many macrofoulers, a compound that interferes with both microbial adhesion and quorum sensing could in principle suppress fouling at multiple stages, from initial colonization through larval recruitment, in contrast to traditional biocides that simply poison organisms indiscriminately.

The authors are careful to frame the work as hypothesis-generating rather than conclusive. Molecular docking offers a static, simplified picture of binding that ignores protein flexibility, solvent effects, bioavailability, toxicity and cellular context, and docking scores are sensitive to ligand size, so fengycin’s large surface area may inflate its apparent advantage over small molecules like DCOIT. BGC predictions similarly depend on genome assembly quality and database annotations, and the predicted metabolites remain putative until chemically verified. The comparison with DCOIT, a biocide with documented environmental concerns of its own, must likewise be treated with caution given the compounds’ very different molecular dimensions and physicochemical properties.

Even so, the study sketches a compelling vision for the future of antifouling technology. Fengycin is biodegradable, reportedly low in toxicity, stable across ranges of temperature, pH and salinity, and potentially effective at low concentrations, making it an attractive starting point for eco-friendly coatings. More broadly, the work demonstrates that coupling genome mining with molecular docking can rapidly link biosynthetic potential to plausible biological function, providing a genomics-guided framework for prioritizing marine natural products before any laboratory assay is run. The next step is clear: in vitro and in vivo validation against real fouling organisms, together with toxicity testing, will determine whether this bacterial chemical weapon can be translated into the antifouling paints of a post-TBT world.

The study’s genome-guided strategy reflects a broader shift in natural products research. Traditional antifouling discovery relied on collecting marine organisms, extracting compounds and testing them laboriously in assays, a process that is slow, expensive and often non-specific. By contrast, mining publicly available genomes with tools like AntiSMASH allows researchers to survey the biosynthetic potential of dozens of organisms computationally before committing laboratory resources, prioritizing the most promising candidates for synthesis and testing.

Fengycin itself is well characterized biochemically. It belongs to a family of lipopeptides produced by Bacillus species alongside surfactin and iturin, and its cyclic peptide ring is assembled by large non-ribosomal peptide synthetase enzymes rather than by ribosomes, which permits the incorporation of unusual amino acids and contributes to its structural diversity. Its amphiphilic nature, combining a polar peptide head with a fatty acid tail, underlies both its surface activity and its ability to interact with biological membranes, properties that have made lipopeptides of interest as biocontrol agents in agriculture as well as in marine applications.

The choice of target proteins in the docking analysis also illustrates how antifouling can be attacked at distinct biological stages. Blocking quorum-sensing enzymes such as LasI could prevent bacteria from coordinating biofilm formation, while disrupting adhesion proteins used by barnacle larvae and mussels could stop macrofoulers from settling on a surface already colonized by microbes. A single compound active against both microbial and invertebrate targets would therefore offer multi-stage protection, a property conventional biocides achieve only through broad toxicity. The authors emphasize, however, that docking predictions must now be followed by laboratory and field validation before any practical coating can emerge.

Subject of Research: In silico prediction of the antifouling potential of the marine bacterial cyclic lipopeptide fengycin

Article Title: An in silico antifouling potential of fengycin, a cyclic lipopeptide produced by marine bacteria

Article References: Viju, N., Vijayaraghavan, P., Satheesh, S., & Jayaprakashvel, M. (2026). An in silico antifouling potential of fengycin, a cyclic lipopeptide produced by marine bacteria. Discover Oceans, 3(1), Article 51. https://doi.org/10.1007/s44289-026-00164-y

Image Credits: AI Generated

DOI: 10.1007/s44289-026-00164-y

Keywords: marine bacteria, fengycin, cyclic lipopeptide, biosynthetic gene clusters, antifouling, antibiofilm, molecular docking, AntiSMASH, biofouling, quorum sensing, natural products, silico