In vitro assessment of nanomaterial biocompatibility is essential for evaluating their safety in biomedical applications. This study investigates the impact of linear low-density polyethylene (LLDPE) embedded with heterogeneous TiO₂/ZnO nanocomposites on cellular metabolic activity and membrane integrity using human dermal fibroblasts (HDF-A), mouse fibroblasts (L929), and leukemia cells (Kasumi-1). The Alamar Blue (AB) assay was employed to assess metabolic activity, which reflects the viability and functional state of cells based on their ability to reduce resazurin into fluorescent resorufin. After 24, 48, and 72 hours of exposure, cell viability remained above 50% for all tested nanocomposite films except LLDPE/100Z and LLDPE/25T75Z/10%, where viability dropped below 40% at 48 and 72 hours. Notably, L929 cells exhibited reduced viability below 50% across most formulations, particularly after prolonged incubation, indicating higher sensitivity to the nanocomposites.
The lactate dehydrogenase (LDH) assay was conducted to evaluate cell membrane integrity, as LDH release into the extracellular medium is a hallmark of cytotoxicity resulting from membrane damage.81131-70-6 custom synthesis Results showed that bare LLDPE and LLDPE/100T nanocomposites induced minimal LDH release, with levels below 30% of control values across all time points.Propionyl-L-carnitine-d3 Protocol In contrast, LLDPE/100Z and LLDPE/25T75Z/10% samples triggered significantly higher LDH release, especially at 72 hours, confirming compromised membrane stability. The elevated LDH levels correlated with observed reductions in metabolic activity, suggesting that Zn²⁺ ion release from ZnO nanoparticles may be responsible for oxidative stress and membrane disruption. Excessive intracellular Zn²⁺ accumulation interferes with ion homeostasis, induces lipid peroxidation, and leads to loss of membrane integrity.
Interestingly, while both AB and LDH assays indicated some degree of toxicity in high-ZnO formulations, the extent of damage was time-dependent. Prolonged exposure led to increased LDH leakage but also revealed that surviving cells retained the capacity to proliferate, as demonstrated by subsequent clonogenic assays. This implies that the observed cytotoxicity may be reversible or sublethal under certain conditions. Furthermore, no significant differences were observed between the control (bare LLDPE) and other formulations in terms of baseline membrane integrity, reinforcing the overall biocompatibility of the polymer matrix when appropriately modified.PMID:35051564
These findings highlight the critical balance between antibacterial efficacy and biocompatibility in nanocomposite design. While ZnO incorporation enhances antimicrobial performance, excessive loading can compromise cellular health. The data suggest that maintaining ZnO content within moderate limits—specifically at 5% in heterogeneous 25T75Z mixtures—can preserve cell viability and membrane function while still providing effective protection against bacterial colonization. These results support the use of optimized LLDPE/TiO₂/ZnO nanocomposites as safe and effective materials for biomedical coatings, particularly in devices requiring long-term contact with host tissues. Further investigation into the mechanisms of Zn²⁺-induced toxicity and strategies to mitigate its effects will be crucial for advancing clinical application.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com