Surface changes in polyhydroxyalkanoate films during biodegradation and biofouling

BACKGROUND: Despite the recognition that microbial biofilms play a role in environmental degradation of bioplastics, few studies investigate the relationship between bioplastic biodegradation and microbial colonisation. We have developed protocols based on a combination of confocal laser scanning mi...

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Published inPolymer international Vol. 57; no. 9; pp. 1042 - 1051
Main Authors Woolnough, Catherine A, Charlton, Tim, Yee, Lachlan H, Sarris, Maria, Foster, L John R
Format Journal Article
LanguageEnglish
Published Chichester, UK John Wiley & Sons, Ltd 01.09.2008
Wiley
Subjects
Applied sciences
biodegradation
biofilms
Chemical reactions and properties
confocal laser scanning microscopy
Degradation
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
polyhydroxyalkanoates
surface roughness
Biological properties
Valerate(hydroxy) copolymer
Goniometry
Biodegradability
Roughness
Alkanoate(hydroxy) polymer
Butyrate(hydroxy) copolymer
Confocal microscopy
surface roughness
Investigation method
Aliphatic polymer
confocal laser scanning microscopy
Surface properties
polyhydroxyalkanoates
Biodegradation
Ester polymer
Butyrate(hydroxy)polymer
Experimental study
Laser microscope
Ester copolymer
Biofouling
Morphology
Biofilm
Kinetics
biofilms
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Abstract BACKGROUND: Despite the recognition that microbial biofilms play a role in environmental degradation of bioplastics, few studies investigate the relationship between bioplastic biodegradation and microbial colonisation. We have developed protocols based on a combination of confocal laser scanning microscopy and contact angle goniometry to qualitatively and quantitatively map surface changes due to biofilm formation and biopolymer degradation of solvent cast poly(3‐hydroxyalkanoate) films in an accelerated in vitro biodegradation system. RESULTS: A significant regression relationship between biofilm formation and polymer biodegradation (R2 = 0.96) was primarily conducted by cells loosely attached to the film surfaces (R2 = 0.95), rather than the strongly attached biofilm (R2 = 0.78). During biodegradation the surface rugosity of poly(3‐hydroxybutyrate) and poly[(3‐hydroxybutyrate)‐co‐(3‐hydroxyvalerate)] increased by factors of 1.5 and 1.76, respectively. In contrast, poly(3‐hydroxyoctanoate) films showed little microbial attachment, negligible weight loss and insignificant changes in surface rugosity. CONCLUSION: A statistically significant link is established between polymer weight loss and biofilm formation. Our results suggest that this degradation is primarily conducted by cells loosely attached to the polymer rather than those strongly attached. Biofilm formation and its type are dependent upon numerous factors; the flat undifferentiated biofilms observed in this study produce a gradual increase in surface rugosity, observed as an increase in waviness. Copyright © 2008 Society of Chemical Industry
AbstractList BACKGROUND: Despite the recognition that microbial biofilms play a role in environmental degradation of bioplastics, few studies investigate the relationship between bioplastic biodegradation and microbial colonisation. We have developed protocols based on a combination of confocal laser scanning microscopy and contact angle goniometry to qualitatively and quantitatively map surface changes due to biofilm formation and biopolymer degradation of solvent cast poly(3‐hydroxyalkanoate) films in an accelerated in vitro biodegradation system. RESULTS: A significant regression relationship between biofilm formation and polymer biodegradation (R2 = 0.96) was primarily conducted by cells loosely attached to the film surfaces (R2 = 0.95), rather than the strongly attached biofilm (R2 = 0.78). During biodegradation the surface rugosity of poly(3‐hydroxybutyrate) and poly[(3‐hydroxybutyrate)‐co‐(3‐hydroxyvalerate)] increased by factors of 1.5 and 1.76, respectively. In contrast, poly(3‐hydroxyoctanoate) films showed little microbial attachment, negligible weight loss and insignificant changes in surface rugosity. CONCLUSION: A statistically significant link is established between polymer weight loss and biofilm formation. Our results suggest that this degradation is primarily conducted by cells loosely attached to the polymer rather than those strongly attached. Biofilm formation and its type are dependent upon numerous factors; the flat undifferentiated biofilms observed in this study produce a gradual increase in surface rugosity, observed as an increase in waviness. Copyright © 2008 Society of Chemical Industry
BACKGROUND: Despite the recognition that microbial biofilms play a role in environmental degradation of bioplastics, few studies investigate the relationship between bioplastic biodegradation and microbial colonisation. We have developed protocols based on a combination of confocal laser scanning microscopy and contact angle goniometry to qualitatively and quantitatively map surface changes due to biofilm formation and biopolymer degradation of solvent cast poly(3-hydroxyalkanoate) films in an accelerated in vitro biodegradation system. RESULTS: A significant regression relationship between biofilm formation and polymer biodegradation (R2 = 0.96) was primarily conducted by cells loosely attached to the film surfaces (R2 = 0.95), rather than the strongly attached biofilm (R2 = 0.78). During biodegradation the surface rugosity of poly(3-hydroxybutyrate) and poly[(3-hydroxybutyrate)-co-(3-hydroxyvalerate)] increased by factors of 1.5 and 1.76, respectively. In contrast, poly(3-hydroxyoctanoate) films showed little microbial attachment, negligible weight loss and insignificant changes in surface rugosity. CONCLUSION: A statistically significant link is established between polymer weight loss and biofilm formation. Our results suggest that this degradation is primarily conducted by cells loosely attached to the polymer rather than those strongly attached. Biofilm formation and its type are dependent upon numerous factors; the flat undifferentiated biofilms observed in this study produce a gradual increase in surface rugosity, observed as an increase in waviness.
Abstract BACKGROUND: Despite the recognition that microbial biofilms play a role in environmental degradation of bioplastics, few studies investigate the relationship between bioplastic biodegradation and microbial colonisation. We have developed protocols based on a combination of confocal laser scanning microscopy and contact angle goniometry to qualitatively and quantitatively map surface changes due to biofilm formation and biopolymer degradation of solvent cast poly(3‐hydroxyalkanoate) films in an accelerated in vitro biodegradation system. RESULTS: A significant regression relationship between biofilm formation and polymer biodegradation ( R 2 = 0.96) was primarily conducted by cells loosely attached to the film surfaces ( R 2 = 0.95), rather than the strongly attached biofilm ( R 2 = 0.78). During biodegradation the surface rugosity of poly(3‐hydroxybutyrate) and poly[(3‐hydroxybutyrate)‐ co ‐(3‐hydroxyvalerate)] increased by factors of 1.5 and 1.76, respectively. In contrast, poly(3‐hydroxyoctanoate) films showed little microbial attachment, negligible weight loss and insignificant changes in surface rugosity. CONCLUSION: A statistically significant link is established between polymer weight loss and biofilm formation. Our results suggest that this degradation is primarily conducted by cells loosely attached to the polymer rather than those strongly attached. Biofilm formation and its type are dependent upon numerous factors; the flat undifferentiated biofilms observed in this study produce a gradual increase in surface rugosity, observed as an increase in waviness. Copyright © 2008 Society of Chemical Industry
Author Yee, Lachlan H
Foster, L John R
Charlton, Tim
Woolnough, Catherine A
Sarris, Maria
Author_xml – sequence: 1
  givenname: Catherine A
  surname: Woolnough
  fullname: Woolnough, Catherine A
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  surname: Charlton
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  givenname: Lachlan H
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  givenname: L John R
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  organization: Bio/Polymer Research Group and Centre for Advanced Macromolecular Design, School of Biotechnology & Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
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Issue 9
Keywords Biological properties
Valerate(hydroxy) copolymer
Goniometry
Biodegradability
Roughness
Alkanoate(hydroxy) polymer
Butyrate(hydroxy) copolymer
Confocal microscopy
surface roughness
Investigation method
Aliphatic polymer
confocal laser scanning microscopy
Surface properties
polyhydroxyalkanoates
Biodegradation
Ester polymer
Butyrate(hydroxy)polymer
Experimental study
Laser microscope
Ester copolymer
Biofouling
Morphology
Biofilm
Kinetics
biofilms
Language English
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Snippet BACKGROUND: Despite the recognition that microbial biofilms play a role in environmental degradation of bioplastics, few studies investigate the relationship...
Abstract BACKGROUND: Despite the recognition that microbial biofilms play a role in environmental degradation of bioplastics, few studies investigate the...
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SubjectTerms Applied sciences
biodegradation
biofilms
Chemical reactions and properties
confocal laser scanning microscopy
Degradation
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
polyhydroxyalkanoates
surface roughness
Title Surface changes in polyhydroxyalkanoate films during biodegradation and biofouling
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