2024-03-29T02:31:01Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/75982023-03-25T01:05:21Zcom_10259.4_2516com_10259_5086com_10259_2604col_10259.4_2517
00925njm 22002777a 4500
dc
Ortega Santamaría, Natividad
author
Sáez, Laura
author
Palacios Santamaría, David
author
Busto Núñez, Mª Dolores
author
2022-06
The behavior against temperature and thermal stability of enzymes is a topic of importance
for industrial biocatalysis. This study focuses on the kinetics and thermodynamics of the thermal
inactivation of Lipase PS from B. cepacia and Palatase from R. miehei. Thermal inactivation was
investigated using eight inactivation models at a temperature range of 40–70 ◦C. Kinetic modeling
showed that the first-order model and Weibull distribution were the best equations to describe
the residual activity of Lipase PS and Palatase, respectively. The results obtained from the kinetic
parameters, decimal reduction time (D and tR), and temperature required (z and z’) indicated a higher
thermal stability of Lipase PS compared to Palatase. The activation energy values (Ea) also indicated
that higher energy was required to denature bacterial (34.8 kJ mol−1
) than fungal (23.3 kJ mol−1
)
lipase. The thermodynamic inactivation parameters, Gibbs free energy (∆G#
), entropy (∆S
#
), and
enthalpy (∆H#
) were also determined. The results showed a ∆G#
for Palatase (86.0–92.1 kJ mol−1
)
lower than for Lipase PS (98.6–104.9 kJ mol−1
), and a negative entropic and positive enthalpic
contribution for both lipases. A comparative molecular dynamics simulation and structural analysis
at 40 ◦C and 70 ◦C were also performed.
http://hdl.handle.net/10259/7598
10.3390/ijms23126828
1422-0067
Lipases
Thermal inactivation
Thermodynamic parameters
Molecular dynamics simulations
B. cepacia
R. miehei
Kinetic Modeling, Thermodynamic Approach and Molecular Dynamics Simulation of Thermal Inactivation of Lipases from Burkholderia cepacia and Rhizomucor miehei