TY - JOUR
T1 - Comparative evaluation of Aspergillus niger strains for endogenous pectin-depolymerization capacity and suitability for d-galacturonic acid production
AU - Schäfer, Dominik
AU - Schmitz, Kevin
AU - Weuster-Botz, Dirk
AU - Benz, J. Philipp
N1 - Publisher Copyright:
© 2020, The Author(s).
PY - 2020/9/1
Y1 - 2020/9/1
N2 - Pectinaceous agricultural residues rich in d-galacturonic acid (d-GalA), such as sugar beet pulp, are considered as promising feedstocks for waste-to-value conversions. Aspergillus niger is known for its strong pectinolytic activity. However, while specialized strains for production of citric acid or proteins are well characterized, this is not the case for the production of pectinases. We, therefore, systematically compared the pectinolytic capabilities of six A. niger strains (ATCC 1015, ATCC 11414, NRRL 3122, CBS 513.88, NRRL 3, and N402) using controlled batch cultivations in stirred-tank bioreactors. A. niger ATCC 11414 showed the highest polygalacturonase activity, specific protein secretion, and a suitable morphology. Furthermore, d-GalA release from sugar beet pulp was 75% higher compared to the standard lab strain A. niger N402. Our study, therefore, presents a robust initial strain selection to guide future process improvement of d-GalA production from agricultural residues and identifies a high-performance base strain for further genetic optimizations.
AB - Pectinaceous agricultural residues rich in d-galacturonic acid (d-GalA), such as sugar beet pulp, are considered as promising feedstocks for waste-to-value conversions. Aspergillus niger is known for its strong pectinolytic activity. However, while specialized strains for production of citric acid or proteins are well characterized, this is not the case for the production of pectinases. We, therefore, systematically compared the pectinolytic capabilities of six A. niger strains (ATCC 1015, ATCC 11414, NRRL 3122, CBS 513.88, NRRL 3, and N402) using controlled batch cultivations in stirred-tank bioreactors. A. niger ATCC 11414 showed the highest polygalacturonase activity, specific protein secretion, and a suitable morphology. Furthermore, d-GalA release from sugar beet pulp was 75% higher compared to the standard lab strain A. niger N402. Our study, therefore, presents a robust initial strain selection to guide future process improvement of d-GalA production from agricultural residues and identifies a high-performance base strain for further genetic optimizations.
KW - Agricultural residues
KW - Aspergillus niger
KW - Pectinase
KW - Sugar beet pulp
KW - d-galacturonic acid
UR - http://www.scopus.com/inward/record.url?scp=85084124631&partnerID=8YFLogxK
U2 - 10.1007/s00449-020-02347-z
DO - 10.1007/s00449-020-02347-z
M3 - Article
C2 - 32328731
AN - SCOPUS:85084124631
SN - 1615-7591
VL - 43
SP - 1549
EP - 1560
JO - Bioprocess and Biosystems Engineering
JF - Bioprocess and Biosystems Engineering
IS - 9
ER -