Highlights
Magnetic-chitosan particles were prepared in nano, micro and macro sizes.
Particle size was important for biocatalyst properties.
Nano-CMag presented highest activity recovery for pectinase immobilization.
Pectinase immobilized on Macro-CMag showed highest thermal and operational stabilities.
Pectinase-Macro-CMag was able to clarify orange juice for at least 25 repeated batches.
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