3 Biotech

, 9:269 | Cite as

Immobilization of endoglucanase Cel9A on chitosan nanoparticles leads to its stabilization against organic solvents: the use of polyols to improve the stability

  • Masoumeh Mohammadi
  • Saeed NajavandEmail author
  • Mohammad Pazhang
Original Article


The immobilization of enzymes improves their stability in non-conventional media such as organic solvents. In this work, the effects of solvents (DMSO, methanol, ethanol, and n-propanol) on the endoglucanase Cel9A activity and stability were studied. Then, the enzymes were stabilized by its immobilization on chitosan nanoparticles and also using polyols (sorbitol and glycerol) against organic solvents. The SEM results illustrated that the chitosan nanoparticles had about 40 nm diameter. The results indicated that the organic solvents, especially n-propanol, decreased the activity of the free and immobilized enzymes. The reduced activity of the immobilized enzyme was less than that of the free enzyme. Our studies about the enzymes’ stability showed that the free and immobilized enzymes in hydrophobic solvents (with high log P) had the lowest stability compared to other solvents as we observed the half-life of the free enzyme in n-propanol solvent was 2.84 min, and the half-life of the immobilized enzyme was 4.98 min in n-propanol and ethanol solvents 4.50 min. Analysis of the combinatory effects of polyols (sorbitol and glycerol) and the solvents on the stability revealed that sorbitol and glycerol had the most stabilizing effect on the free enzyme in hydrophilic (DMSO) and hydrophobic (n-propanol) solvents, respectively. However, the stabilizing effects of polyols in the immobilized enzyme were independent of the solvents’ hydrophobicity (or log P) due to the hydrophilic properties of chitosan nanoparticles. Therefore, one can conclude that the physiochemical properties of nanoparticles (such as hydrophilicity) influence the stabilizing effects of polyols on immobilized enzyme.


Immobilization Chitosan nanoparticles Endoglucanase Cel9A 



Endoglucanase Cel9A from Alicyclobacillus acidocaldarius


Chitosan nanoparticles


Dimethyl sulfoxide


Dinitrosalcylic acid


Carboxymethyl cellulose




Scanning electron microscopy


Compliance with ethical standards

Conflict of interest

The authors declare that there are no conflicts of interest.


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Copyright information

© King Abdulaziz City for Science and Technology 2019

Authors and Affiliations

  1. 1.Department of Cellular and Molecular Biology, Faculty of ScienceAzarbaijan Shahid Madani UniversityTabrizIran

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