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Pseudomonas Infection Responsive Liquid Crystals for Glycoside Hydrolase and Antibiotic Combination

Bacterial biofilms account for up to 80% of all community-acquired infections for which bacterial eradication is currently not achievable using conventional antimicrobial treatments. The protective matrix that engulfs biofilm-associated bacteria frequently renders antibiotics ineffective. Glycoside hydrolases are a class of enzymes that break down the biofilm matrix, thereby increasing the effectiveness of antibiotics. Herein, nanostructured liquid crystals composed of glyceryl monooleate (GMO) were investigated as an infection responsive delivery system for alginate lyase (glycoside hydrolase) and gentamicin (antibiotic) to treat Pseudomonas biofilms. The presence of Pseudomonas lipase triggered the release of alginate lyase and gentamicin from the GMO liquid crystals. Treatment with the liquid crystals containing alginate lyase and gentamicin resulted in a greater than 2-log reduction in mucoid Pseudomonas aeruginosa (clinical isolate) biofilm. The anti-biofilm activity of alginate lyase and gentamicin ...