Liposome-encapsulated antibiotics and biosurfactants: an effective strategy to boost biofilm eradication in cooling towers

Abstract An excessive amount of water is needed for cooling towers in oil refineries to cool the machinery. However, water has been observed to favor microbial growth and biofilms significantly. The microbial biofilms are usually treated with synthetic biocides, which are ineffective and generate to...

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Main Authors: Marcus Vinícius Dias-Souza, Ihtisham Ul Haq, Sérgio Pagnin, Andrea Azevedo Veiga, Vera Lúcia dos Santos
Format: Article
Language:English
Published: BMC 2025-06-01
Series:Microbial Cell Factories
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Online Access:https://doi.org/10.1186/s12934-025-02746-5
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author Marcus Vinícius Dias-Souza
Ihtisham Ul Haq
Sérgio Pagnin
Andrea Azevedo Veiga
Vera Lúcia dos Santos
author_facet Marcus Vinícius Dias-Souza
Ihtisham Ul Haq
Sérgio Pagnin
Andrea Azevedo Veiga
Vera Lúcia dos Santos
author_sort Marcus Vinícius Dias-Souza
collection DOAJ
description Abstract An excessive amount of water is needed for cooling towers in oil refineries to cool the machinery. However, water has been observed to favor microbial growth and biofilms significantly. The microbial biofilms are usually treated with synthetic biocides, which are ineffective and generate toxic by-products harmful to the environment. This study explores using rhamnolipid and free or encapsulated antimicrobials in liposomes to control several bacterial species exhibiting low antimicrobial susceptibility in planktonic and biofilm forms. The antimicrobial efficacy of rhamnolipid was evaluated through minimum inhibitory concentration (MIC) tests, showing values between 0.244 and 31.25 µg/mL. Biofilm inhibition assays revealed that rhamnolipid significantly reduced biofilm viability, performing comparably to meropenem and more effectively than chloramphenicol. Liposomes were produced with initial diameters of 100 and 200 nm, and encapsulation efficiencies were 56.7% for rhamnolipid, 47.3% for meropenem, and 31.25% for chloramphenicol. Among the formulations, 100 nm rhamnolipid-loaded liposomes exhibited the highest antibiofilm efficacy, achieving up to 92% biofilm reduction in Stenotrophomonas maltophilia 94 (p < 0.01). Meropenem liposomes of 100 nm also performed better than their 200 nm counterparts, with up to 85% reduction in Pseudomonas aeruginosa biofilms (p < 0.05). No significant size-dependent differences were observed for chloramphenicol liposomes, with maximum inhibition around 60% at both sizes. Long-term stability and antibiofilm activity were evaluated exclusively for S. maltophilia 94 over 90 days of refrigerated storage (4 °C). Dynamic light scattering revealed significant vesicle size increases over time for both formulations (p < 0.05), yet their antibiofilm activity remained stable. Rhamnolipid liposomes (100 nm) maintained significantly higher efficacy than 200 nm vesicles throughout the period (p < 0.01). Meropenem liposomes retained considerable activity, though a moderate decrease was noted after 60 days. Scanning electron microscopy (SEM) at days 0 and 90 confirmed the antimicrobial impact of liposomal treatments: biofilms showed disrupted architecture, reduced extracellular matrix, and evident morphological damage to bacterial cells, supporting quantitative results. These findings demonstrate that liposome-encapsulated rhamnolipids and antibiotics are effective against resilient biofilms. The successful formulation and long-term stability of rhamnolipid liposomes highlight their potential as a sustainable and eco-friendly alternative for industrial biofilm control, reducing reliance on conventional biocides and minimizing environmental impact.
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spelling doaj-art-5635c36644b14aec842749eec0ef9d782025-08-20T03:22:57ZengBMCMicrobial Cell Factories1475-28592025-06-0124111210.1186/s12934-025-02746-5Liposome-encapsulated antibiotics and biosurfactants: an effective strategy to boost biofilm eradication in cooling towersMarcus Vinícius Dias-Souza0Ihtisham Ul Haq1Sérgio Pagnin2Andrea Azevedo Veiga3Vera Lúcia dos Santos4Applied Microbiology Laboratory, Microbiology Department, Instituto de Ciências Biológicas, C.P. 486, Universidade Federal de Minas GeraisDepartment of Physical Chemistry and Technology of Polymers, Silesian University of TechnologyResearch and Development Center (CENPES), Petróleo Brasileiro D.A. Rio de JaneiroResearch and Development Center (CENPES), Petróleo Brasileiro D.A. Rio de JaneiroApplied Microbiology Laboratory, Microbiology Department, Instituto de Ciências Biológicas, C.P. 486, Universidade Federal de Minas GeraisAbstract An excessive amount of water is needed for cooling towers in oil refineries to cool the machinery. However, water has been observed to favor microbial growth and biofilms significantly. The microbial biofilms are usually treated with synthetic biocides, which are ineffective and generate toxic by-products harmful to the environment. This study explores using rhamnolipid and free or encapsulated antimicrobials in liposomes to control several bacterial species exhibiting low antimicrobial susceptibility in planktonic and biofilm forms. The antimicrobial efficacy of rhamnolipid was evaluated through minimum inhibitory concentration (MIC) tests, showing values between 0.244 and 31.25 µg/mL. Biofilm inhibition assays revealed that rhamnolipid significantly reduced biofilm viability, performing comparably to meropenem and more effectively than chloramphenicol. Liposomes were produced with initial diameters of 100 and 200 nm, and encapsulation efficiencies were 56.7% for rhamnolipid, 47.3% for meropenem, and 31.25% for chloramphenicol. Among the formulations, 100 nm rhamnolipid-loaded liposomes exhibited the highest antibiofilm efficacy, achieving up to 92% biofilm reduction in Stenotrophomonas maltophilia 94 (p < 0.01). Meropenem liposomes of 100 nm also performed better than their 200 nm counterparts, with up to 85% reduction in Pseudomonas aeruginosa biofilms (p < 0.05). No significant size-dependent differences were observed for chloramphenicol liposomes, with maximum inhibition around 60% at both sizes. Long-term stability and antibiofilm activity were evaluated exclusively for S. maltophilia 94 over 90 days of refrigerated storage (4 °C). Dynamic light scattering revealed significant vesicle size increases over time for both formulations (p < 0.05), yet their antibiofilm activity remained stable. Rhamnolipid liposomes (100 nm) maintained significantly higher efficacy than 200 nm vesicles throughout the period (p < 0.01). Meropenem liposomes retained considerable activity, though a moderate decrease was noted after 60 days. Scanning electron microscopy (SEM) at days 0 and 90 confirmed the antimicrobial impact of liposomal treatments: biofilms showed disrupted architecture, reduced extracellular matrix, and evident morphological damage to bacterial cells, supporting quantitative results. These findings demonstrate that liposome-encapsulated rhamnolipids and antibiotics are effective against resilient biofilms. The successful formulation and long-term stability of rhamnolipid liposomes highlight their potential as a sustainable and eco-friendly alternative for industrial biofilm control, reducing reliance on conventional biocides and minimizing environmental impact.https://doi.org/10.1186/s12934-025-02746-5Cooling towersBacteriaBiofilmsAntibioticsLiposomesBiosurfactant
spellingShingle Marcus Vinícius Dias-Souza
Ihtisham Ul Haq
Sérgio Pagnin
Andrea Azevedo Veiga
Vera Lúcia dos Santos
Liposome-encapsulated antibiotics and biosurfactants: an effective strategy to boost biofilm eradication in cooling towers
Microbial Cell Factories
Cooling towers
Bacteria
Biofilms
Antibiotics
Liposomes
Biosurfactant
title Liposome-encapsulated antibiotics and biosurfactants: an effective strategy to boost biofilm eradication in cooling towers
title_full Liposome-encapsulated antibiotics and biosurfactants: an effective strategy to boost biofilm eradication in cooling towers
title_fullStr Liposome-encapsulated antibiotics and biosurfactants: an effective strategy to boost biofilm eradication in cooling towers
title_full_unstemmed Liposome-encapsulated antibiotics and biosurfactants: an effective strategy to boost biofilm eradication in cooling towers
title_short Liposome-encapsulated antibiotics and biosurfactants: an effective strategy to boost biofilm eradication in cooling towers
title_sort liposome encapsulated antibiotics and biosurfactants an effective strategy to boost biofilm eradication in cooling towers
topic Cooling towers
Bacteria
Biofilms
Antibiotics
Liposomes
Biosurfactant
url https://doi.org/10.1186/s12934-025-02746-5
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