The effects of pronase (PRN), cellulase (CEL) or DNaseI alone or combined with benzalkonium chloride (BAC) against Listeria monocytogenes-carrying biofilms were assayed. The best removal activity against L. monocytogenes-Escherichia coli biofilms was obtained using DNaseI followed by PRN and CEL. Subsequently, a modified logistic model was used to quantify the combined effects of PRN or DNaseI with BAC. A better BAC performance after PRN compared to DNaseI eradicating L. monocytogenes was observed. In E. coli the effects were the opposite. Finally, effects of DNaseI and DNaseI-BAC treatments were compared against two different L. monocytogenes-carrying biofilms. DNaseI-BAC was more effective against L. monocytogenes when co-cultured with E. coli. Nonetheless, comparing the removal effects after BAC addition, these were higher in mixed-biofilms with Pseudomonas fluorescens. However, a high number of released viable cells was observed after combined treatments. These results open new perspectives of enzymes as an anti-biofilm strategy for environmental pathogen control.

Removal of Listeria monocytogenes dual-species biofilms using combined enzyme-benzalkonium chloride treatments / RODRIGUEZ LOPEZ, Pedro; Carballo-Justo, A.; Draper, L. A.; Cabo, M. L.. - In: BIOFOULING. - ISSN 0892-7014. - 33:1(2017), pp. 45-58. [10.1080/08927014.2016.1261847]

Removal of Listeria monocytogenes dual-species biofilms using combined enzyme-benzalkonium chloride treatments

RODRIGUEZ LOPEZ, Pedro;
2017-01-01

Abstract

The effects of pronase (PRN), cellulase (CEL) or DNaseI alone or combined with benzalkonium chloride (BAC) against Listeria monocytogenes-carrying biofilms were assayed. The best removal activity against L. monocytogenes-Escherichia coli biofilms was obtained using DNaseI followed by PRN and CEL. Subsequently, a modified logistic model was used to quantify the combined effects of PRN or DNaseI with BAC. A better BAC performance after PRN compared to DNaseI eradicating L. monocytogenes was observed. In E. coli the effects were the opposite. Finally, effects of DNaseI and DNaseI-BAC treatments were compared against two different L. monocytogenes-carrying biofilms. DNaseI-BAC was more effective against L. monocytogenes when co-cultured with E. coli. Nonetheless, comparing the removal effects after BAC addition, these were higher in mixed-biofilms with Pseudomonas fluorescens. However, a high number of released viable cells was observed after combined treatments. These results open new perspectives of enzymes as an anti-biofilm strategy for environmental pathogen control.
Removal of Listeria monocytogenes dual-species biofilms using combined enzyme-benzalkonium chloride treatments / RODRIGUEZ LOPEZ, Pedro; Carballo-Justo, A.; Draper, L. A.; Cabo, M. L.. - In: BIOFOULING. - ISSN 0892-7014. - 33:1(2017), pp. 45-58. [10.1080/08927014.2016.1261847]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2867685
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