Natural Antimicrobial Building Materials Enhanced with Hops and Curly Sorrel

Jim Crocker
19th July, 2024

Natural Antimicrobial Building Materials Enhanced with Hops and Curly Sorrel

The solid composite material pictured here (99CS), formulated from waste cooking oil and enriched with curly sorrel root (Rumex crispus), exemplifies the sustainable building solutions developed in this study which demonstrated significant antimicrobial properties.

Image adapted from: Staroń et al. / CC BY (Source)

Key Findings

  • Researchers at Cracow University of Technology developed strong, durable composites using waste cooking oil (WCO) enriched with hops or sorrel root
  • These WCO composites showed significant antibacterial and antifungal properties, effectively combating various pathogens
  • The study suggests that WCO-based composites could help reduce microbial contamination in construction materials, offering a sustainable solution to public health challenges
Waste cooking oil (WCO) has emerged as a promising raw material for producing innovative composite materials. A recent study conducted by the Cracow University of Technology investigates the potential of WCO-based composites enriched with hops or sorrel root for use in the construction industry, particularly focusing on their antibacterial and antifungal properties[1]. The study addresses the growing problem of bacterial and fungal infections, which are becoming increasingly prevalent. Fungal skin infections, for instance, are on the rise, necessitating the development of materials with both high strength and biocidal properties. The production process of these WCO composites involves polymerization, esterification, and transesterification reactions, which result in the hardening of the materials. The study evaluated the compressive and flexural strength, absorbability, and hydrophobicity of the WCO composites. Additionally, the antibacterial and antifungal effects of these composites were tested against various pathogens, including Gram-positive bacteria (Staphylococcus aureus and Staphylococcus epidermidis), Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa), and fungi (Aspergillus niger and Pichia anomala). The findings revealed that the maximum split tensile strength (4.3 MPa) and flexural strength (5.1 MPa) were recorded for oil-hop composites. These composites demonstrated significant antibacterial activity, with oil composites enriched with curly sorrel and hops showing antibacterial effects against S. aureus at 27% and 25%, respectively. High biocidal activity was observed against E. coli (up to 70%) and S. epidermidis (up to 99%) in composites containing curly sorrel. The antifungal activities of hops-enriched composites were 15% and 19% for P. anomala and A. niger, respectively, while those with curly sorrel showed higher antifungal activities of 42% and 30%. The study's results align with previous research on the use of waste cooking oil in creating strong, durable materials. For example, earlier studies have shown that asbestos fibers, when bound in a polymer matrix formed from waste cooking oil, produce compact materials with high hardness and mechanical strength[2]. This demonstrates the versatility of WCO as a raw material for various applications, including construction. Furthermore, the antibacterial properties of the WCO composites enriched with hops or sorrel root can be linked to traditional uses of natural remedies. For instance, Rumex crispus L., commonly known as curly sorrel, has been traditionally used for treating microbial infections, malaria, and sleeping sickness[3]. The current study builds on this knowledge by scientifically validating the antimicrobial efficacy of sorrel root, thus providing a natural and sustainable solution to combat microbial growth in construction materials. The emergence of new infectious agents and the increasing prevalence of infectious diseases pose significant public health challenges[4]. The development of materials with inherent biocidal properties can contribute to mitigating these challenges by reducing the risk of microbial contamination and transmission in built environments. In conclusion, the Cracow University of Technology's study highlights the potential of WCO-based composites enriched with hops or sorrel root for use in the construction industry. These materials not only exhibit high strength properties but also demonstrate significant antibacterial and antifungal activities. By leveraging waste cooking oil and natural biocidal agents, this research offers a sustainable and innovative approach to addressing the growing problem of microbial infections in various applications.

EnvironmentSustainabilityBiochem

References

Main Study

1) Antimicrobial properties of WCO-based composites enriched with hops and curly sorrel for green building solutions.

Published 18th July, 2024

https://doi.org/10.1371/journal.pone.0307452

Related Studies

2) Obtaining of oil blocks as a way to manage hazardous asbestos.

https://doi.org/10.1016/j.wasman.2020.02.009

3) Evaluation of the Bioactivities of Rumex crispus L. Leaves and Root Extracts Using Toxicity, Antimicrobial, and Antiparasitic Assays.

https://doi.org/10.1155/2019/6825297

4) Emerging and Neglected Infectious Diseases: Insights, Advances, and Challenges.

https://doi.org/10.1155/2017/5245021


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