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Theoretical and Numerical analysis of immobilised α-chymotrypsin under kinetic control

Vel Alagu1, Alagu Eswari1
  1. Assistant Professor, Department of Mathematics, Sri Ramakrishna Institute of Technology,Pachapalayam, Coimbatore-641010,Tamilnadu, India
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In this paper, a mathematical model for immobilized  -chymotrypsin under kinetic control steady-state conditions is discussed. The model is based on diffusion equations containing a non-linear term related to the reaction processes. Analytical expressions for concentrations are derived using Modified Adomian decomposition method. Satisfactory agreement is obtained in the comparison of approximate analytical solution and numerical simulation.


Kinetically controlled peptide synthesis, Nucleophile, Internal diffusion and reaction, Non-linear equations, Modified Adomian decomposition method.


In recent years, concentration is devoted to enzymes and biocatalysts, particularly monophasic organic solvents [1-5]. Enzymes are normally tightly packed in cellular organelles or in enzyme cascades thus enabling catalytic processes to take place precisely when and where they are needed [6]. Since enzymes are usually insoluble in these systems, unless otherwise conveniently engineered, these are heterogeneous catalytic systems. When comparing the activity of enzymes various organic solvents, it is important to ensure that the roles of external and internal diffusion non-aqueous enzymatic systems do not change for different solvents [7].
These problems may be solved by the use of immobilized enzymes. Immobilization often stabilizes structure of the enzymes, thereby allowing their applications even under harsh environmental conditions [8, 9]. Many predictions of biocatalyst behavior are based on relatively simple physical or chemical interpretations, sometimes combined with knowledge from biocatalysts in aqueous systems. Thermodynamic approaches that consider the distribution of components among the various phases, and their solvation in the bulk (i.e. organic) phase have proved to be particularly useful [10, 11]. A number of applications for enzymes in organic solvents have been developed in chemical processing (particularly for the synthesis of optically active intermediates), food-related conversions and analyses [12].
The study of simultaneous diffusion and reaction is important in order to optimize the catalytic system, which is confirmed by the large number of publications dealing with description and mathematical modeling of this phenomenon [13–20]. Built a model to describe the action of immobilized a-chymotrypsin synthesizing di- or tripeptides in acetonitrile medium under kinetic control [21].
To the best of our knowledge, there are no analytical solutions reported for the molar concentrations of acyl donor and nucleophile. In this paper, we have derived the new analytical expression of concentration of acyl donor and nucleophile. Also we have provided the simple expression of rate consumption for each of the substrates. In addition our analytical results of the molar concentrations are compared with the numerical simulations using Matlab program.


In acetonitrile medium under kinetic control, the action of  -chymotrypsin synthesizing di- or tripeptides can be expressed by the following enzyme-catalyzed reactions [21]:
Formation of product:


The Adomian decomposition method (ADM) is a creative and effective method for exactly solving the differential equations of various kinds. It is important to note that a large amount of research work has been devoted to the application of the ADM to a wide class of linear and nonlinear, ordinary or partial differential equations. The ADM decomposes a solution into an infinite series which converges rapidly to the exact solution. The convergence of the ADM has been investigated by a number of authors [22-27]. In order to solve the boundary value problem, Eq. 9–12, we used the Adomian decomposition method.
The basic principle of this method is described in Appendix A. Detailed derivations of the dimensionless concentrations U and V of the acyl donor and nucleophiles are described in Appendix B. As a result, we have obtained




In this work, we obtained analytical expressions of concentration of acyl donor and nucleophile for all possible values of dimensionless parameters. The closed analytical expressions of concentrations are obtained using modified Adomian decomposition method. Furthermore, on the basis of the outcome of this work, it is possible to calculate the approximate amounts of rate consumption used for immobilized a-chymotrypsin catalyzed peptide synthesis in acetonitrile medium for all possible values of the parameters. This method is an extremely simple method and it is also a promising method to solve other non-linear equations. The information gained from this theoretical model can be useful for the kinetic analysis of the experimental results and the product distribution.


The author A. Eswari is very thankful to the Management, Dr. R. Joseph Xavier, the Principal, and Prof. K. Kanagasabapathy, the HOD, Science and Humanities (Mathematics), Sri Ramakrishna Institute of Technology, Coimbatore‐641010, Tamil Nadu, India for their encouragement.


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