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Updated: May 11, 2026

Defining Substrate Specificities for Lipase and Phospholipase Candidates
08:59

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Published on: November 23, 2016

Densitometry based microassay for the determination of lipase depolymerizing activity on polyhydroxyalkanoate.

Diana Hooi-Ean Ch'ng1, Kumar Sudesh

  • 1Ecobiomaterial Research Laboratory, School of Biological Sciences, Universiti Sains Malaysia, Penang, 11800, Malaysia. ksudesh@usm.my.

AMB Express
|May 10, 2013
PubMed
Summary

A new method effectively assays polyhydroxyalkanoate (PHA) degradation by lipases. Many lipases showed significant PHA-hydrolytic activity, with Chromobacterium viscosum lipase being the most potent.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Materials Science

Background:

  • Polyhydroxyalkanoates (PHAs) are biodegradable polyesters with diverse applications.
  • Assessing the enzymatic degradation of PHAs, particularly by lipases, is crucial for understanding their environmental fate and potential biotechnological uses.
  • Existing methods for evaluating lipase activity on PHA substrates can be time-consuming or lack sensitivity.

Purpose of the Study:

  • To develop a novel, sensitive, and rapid method for assaying the polyhydroxyalkanoate (PHA)-degrading ability of triacylglycerol lipases.
  • To compare the PHA-hydrolytic activity of various lipases from different origins (fungal, bacterial, animal).
  • To investigate the substrate specificity of lipases using PHA in comparison to conventional substrates.

Main Methods:

  • A novel densitometry analysis was developed, leveraging the affinity of lipases for hydrophobic interfaces.
  • Lipase droplets were applied to a PHA-coated surface to evaluate hydrolytic activity.
  • The hydrolysis patterns and opacity on PHA thin films were analyzed to compare lipase activity.
  • Comparative assays were performed using emulsified p-nitrophenyl laurate and olive oil.

Main Results:

  • Twelve out of fourteen tested lipases demonstrated the ability to hydrolyze a P(3HB-co-92 mol% 4HB) thin film.
  • The method allowed for easy comparison of PHA-hydrolytic strength among different lipases based on hydrolysis spot characteristics.
  • Lipase from Chromobacterium viscosum exhibited the highest PHA-degrading activity among the tested enzymes.
  • Some lipases displayed enhanced activity on PHA compared to conventional substrates like emulsified p-nitrophenyl laurate and olive oil.

Conclusions:

  • A sensitive and rapid densitometry assay for evaluating lipase-mediated PHA degradation was successfully established.
  • The study identified multiple lipases with significant PHA-degrading capabilities, highlighting the potential of microbial enzymes in PHA biodegradation.
  • The findings suggest that PHA can be a suitable substrate for certain lipases, opening avenues for enzymatic applications in PHA processing and recycling.