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Utilization of different agro-industrial wastes for sustainable bioproduction of citric acid by Aspergillus niger

Paper ID Volume ID Publish Year Pages File Format Full-Text
3777 188 2011 10 PDF Available
Title
Utilization of different agro-industrial wastes for sustainable bioproduction of citric acid by Aspergillus niger
Abstract

In view of ever growing demand of citric acid, there is an urgent need to look for inexpensive and novel substrates for feasible production of citric acid. In this context, the present study was carried out to evaluate the potential of different agro-industrial wastes for hyper production of citric acid through solid-state and submerged fermentation by Aspergillus niger NRRL 567 and NRRL 2001. It was found that among all the solid substrates utilized, apple pomace with 66.0 ± 1.9 g/kg of dry substrate proved to be an excellent substrate for citric acid production by A. niger NRRL 567 at 72 h of incubation. A. niger NRRL 2001 resulted in slightly lower citric acid concentration of 61.0 ± 1.9 g/kg of dry substrate at the same incubation time. APS-1 (apple pomace ultrafiltration sludge-1) gave highest citric acid production rate of 9.0 ± 0.3 g/l and 8.9 ± 0.3 g/l of substrate by A. niger NRRL 567 and NRRL 2001 by submerged fermentation, respectively. Further study with apple pomace and apple pomace ultrafiltration sludge-1 by A. niger NRRL 567 was carried out. Addition of 3% (v/w) ethanol and 4% (v/w) methanol to apple pomace gave significantly higher citric acid values of 127.9 ± 4.3 g/kg and 115.8 ± 3.8 g/kg of dry substrate by A. niger NRRL 567 by solid-state fermentation. Higher citric acid values of 18.2 ± 0.4 g/l and 13.9 ± 0.4 g/l of apple pomace ultrafiltration sludge-1 were attained after addition of 3% (v/v) ethanol and 4% (v/v) methanol, respectively by A. niger NRRL 567. Apple pomace solid waste and apple pomace ultrafiltration sludge-1 thus proved to be an excellent source for citric acid production, of the different substrates chosen.

Research highlights► Economical and sustainable citric acid (CA) production using agro-industrial wastes. ► Economy use of negative cost agro-industrial wastes. ► To met the rising demand of CA in many advanced applications in food and biomedicines. ► To lessen the environmental hazards caused by the disposal of agro-industrial wastes. ► Environmental capture of waste carbon leading to mitigation of climate change.

Keywords
AP, apple pomace; APS-1, apple pomace sludge with 45 ± 5 g/l suspended solids; APS-2, apple pomace sludge with 80 g/l suspended solids; BSG, brewery spent grain; cfu, colony forming units; CW, citrus waste; EtOH, ethanol; GRAS, generally recognized as saf
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 54, Issue 2, 15 April 2011, Pages 83–92
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us