Related Experiment Video
Updated: Jun 23, 2026
09:41
Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro
Published on: March 17, 2023
A method to quantify transesterification activities of lipases in litters
1Equipe Ecologie Microbienne et Biotechnologies, Institut Méditerranéen d'Ecologie et de Paléoécologie, U.M.R. C.N.R.S. I.R.D. 6116, Université Paul Cézanne, Faculté des Sciences et Techniques de St Jérôme, 13397, Marseille, Cedex 20, France.
Journal of Microbiological Methods
|May 12, 2009
Summary
Researchers detected lipase transesterification activity in forest litter for the first time. This enzyme activity, crucial for carbon storage, was optimized using specific substrates and conditions, revealing highly thermostable lipases in oak litters.
Area of Science:
- Environmental microbiology
- Biocatalysis
- Soil science
Background:
- Lipases (glycerol ester hydrolases) are enzymes with reversible catalytic activity, enabling esterification and transesterification.
- These synthetic activities are significant in natural ecosystems, potentially contributing to carbon storage in soils and litters.
Purpose of the Study:
- To report the first detection of transesterification activities of lipases in forest litter.
- To characterize the conditions influencing lipase activity in litter samples.
Main Methods:
- Two types of forest litter (Quercus pubescens and mixed Quercus pubescens/Q. ilex) were used.
- Transesterification activity was assayed using p-nitrophenyl esters and pentanol in a heptane solvent.
- Enzyme activity was measured under varying litter amounts, incubation times, substrate concentrations, temperatures, and water activities.
Main Results:
- Lipase transesterification activity was detected and quantified in both litter types.
- Activity was proportional to litter amount, incubation time, and substrate concentration, and increased with temperature.
- Lipases exhibited high thermostability, retaining activity after incubation at 70°C for 2 hours.
- Optimal activity was observed with p-nitrophenyl caprylate, and activity correlated with water activity (a(w)).
Conclusions:
- Forest litter harbors active and thermostable lipases capable of transesterification.
- Optimal conditions for quantifying litter lipase transesterification activity were established: 10 mM p-nitrophenyl caprylate, 1 g litter, 500 μL pentanol in 4 mL heptane at 30°C for 2 hours.
