Dhillon, Gurpreet Singh; Brar, Satinder Kaur; Kaur, Surinder et Verma, Mausam P. (2013). Screening of agro-industrial wastes for citric acid bioproduction by Aspergillus niger NRRL 2001 through solid state fermentation. Journal of the Science of Food and Agriculture , vol. 93 , nº 7. pp. 1560-1567. DOI: 10.1002/jsfa.5920.
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Background: The citric acid (CA) industry is currently struggling to develop a sustainable and economical process owing to high substrate and energy costs. Increasing interest in the replacement of costly synthetic substrates by renewable waste biomass has fostered research on agro-industrial wastes and screening of raw materials for economical CA production. The food-processing industry generates substantial quantities of waste biomass that could be used as a valuable low-cost fermentation substrate. The present study evaluated the potential of different agro-industrial wastes, namely apple pomace (AP), brewer's spent grain, citrus waste and sphagnum peat moss, as substrates for solid state CA production using Aspergillus niger NRRL 2001. Results: Among the four substrates, AP resulted in highest CA production of 61.06 ± 1.9 g kg-1 dry substrate (DS) after a 72 h incubation period. Based on the screening studies, AP was selected for optimisation studies through response surface methodology (RSM). Maximum CA production of 312.32 g kg-1 DS was achieved at 75% (v/w) moisture and 3% (v/w) methanol after a 144 h incubation period. The validation of RSM-optimised parameters in plastic trays resulted in maximum CA production of 364.4 ± 4.50 g kg-1 DS after a 120 h incubation period. Conclusion: The study demonstrated the potential of AP as a cheap substrate for higher CA production. This study contributes to knowledge about the future application of carbon rich agro-industrial wastes for their value addition to CA. It also offers economic and environmental benefits over traditional ways used to dispose off agro-industrial wastes.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | agro-industrial wastes; aspergillus niger; citric acid; inducer; response surface methodology; solid state tray fermentation |
| Centre: | Centre Eau Terre Environnement |
| Date de dépôt: | 05 déc. 2016 20:42 |
| Dernière modification: | 20 avr. 2018 20:05 |
| URI: | https://espace.inrs.ca/id/eprint/3417 |
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