Abstract：
:Cross-linked enzyme aggregates of poly-3-hydroxybutyrate (PHB) depolymerase from Streptomyces exfoliatus (PhaZ(Sex)-CLEAs) have been prepared. Acetone was used as the precipitating agent, while addition of bovine serum albumin (BSA) facilitated CLEAs formation. Conditions for enzyme precipitation and cross-linking have been optimized, and confocal scanning microscopy showed a homogeneous enzyme distribution in the biocatalyst. Obtained PhaZ(Sex)-CLEAs presented an average size of 50-300 μm, showing a high PHB depolymerase activity of 255 U/g wet biocatalyst at 40°C and pH 7.0. Temperature-activity profile of PhaZ(Sex)-CLEAs at pH 8.0 showed that the highest activity for pNPB hydrolysis was achieved at 60°C, whereas pH-activity profile at 40°C indicated that highest activity for PHB hydrolysis was achieved at pH 7.0. Additionally, immobilized biocatalyst could be recycled at least for 20 consecutive batch reactions without loss of catalytic activity, and showed higher pH and temperature stability, and better tolerance to several organic solvents than its soluble counterpart.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Hormigo D,García-Hidalgo J,Acebal C,de la Mata I,Arroyo Mdoi
10.1016/j.biortech.2011.09.035subject
Has Abstractpub_date
2012-07-01 00:00:00pages
177-82eissn
0960-8524issn
1873-2976pii
S0960-8524(11)01304-6journal_volume
115pub_type
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