Abstract
The production of exo-polygalacturonase (exo-PG) from orange peel (OP), a food industrial waste, using Aspergillus sojae was studied in submerged culture. A simple, low-cost, industrially significant medium formulation, composed of only OP and (NH4)2SO4 (AS) was developed. At an inoculum size of 2.8 × 103 spores/mL, growth was in the form of pellets, which provided better mixing of the culture broth and higher exo-PG activity. These pellets were successfully used as an inoculum for bioreactors and 173.0 U/mL exo-PG was produced. Fed-batch cultivation further enhanced the exo-PG activity to 244.0 U/mL in 127.5 h. The final morphology in the form of pellets is significant to industrial fermentation easing the subsequent downstream processing. Furthermore, the low pH trend obtained during this fermentation serves an advantage to fungal fermentations prone to contamination problems. As a result, an economical exo-PG production process was defined utilizing a food industrial by-product and producing high amount of enzyme.
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This work was supported by TÜBITAK (Turkey) and BMBF (Germany) through the Intensified Cooperation Project of IntenC 107O602 and EUROTRANSBIO, PGSYS/ETB-2008-44.
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Buyukkileci, A.O., Lahore, M.F. & Tari, C. Utilization of orange peel, a food industrial waste, in the production of exo-polygalacturonase by pellet forming Aspergillus sojae . Bioprocess Biosyst Eng 38, 749–760 (2015). https://doi.org/10.1007/s00449-014-1315-1
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DOI: https://doi.org/10.1007/s00449-014-1315-1