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Rheological Studies During Submerged Citric Acid Fermentation by Aspergillus niger in Stirred Fermentor Using Apple Pomace Ultrafiltration Sludge.

Dhillon, Gurpreet Singh; Brar, Satinder Kaur; Kaur, Surinder; Verma, Mausam (2013). Rheological Studies During Submerged Citric Acid Fermentation by Aspergillus niger in Stirred Fermentor Using Apple Pomace Ultrafiltration Sludge. Food and Bioprocess Technology , vol. 6 , nº 5. p. 1240-1250. DOI: 10.1007/s11947-011-0771-8.

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Résumé

Rheological profile studies for apple pomace ultrafiltration sludge (APS) broth with filamentous fungus, Aspergillus niger NRRL-567 during citric acid (CA) fermentation are reported for the biomass developed in a 7. 5 l bench scale fermentor. CA bioproduction of 23. 67 ± 1. 0 g/l APS and 40. 34 ± 1. 98 g/l APS was obtained in control (120 h) and in treatment with inducer, MeOH 3% (v/v), respectively, after 132 h of fermentation by A. niger NRRL 567. The rheological properties of the fermentation broth including pellets were analyzed. The control demonstrated non-Newtonian pseudoplastic behaviour due to more filamentous growth. However, in treatment supplemented with inducer (methanol), pellet form was observed during fermentation with less viscous non-Newtonian broths. The power law model was followed with good confidence of fit (77. 8-88. 9%) throughout the fermentation in treatment with MeOH as an inducer. However, power law was followed with moderate fit of confidence (65. 3-75. 9%) at the beginning of fermentation until 48 h and later followed a good confidence of fit (75. 9-88. 2%) until 144 h of fermentation in control. Important rheological changes occurred in the broth during maximal CA production phase along with increase in biomass in the pelleted mycelium form.

Type de document:
Mots-clés libres: apple pomace ultrafiltration sludge; aspergillus niger; non-Newtonian behaviour; rheology; submerged fermentation
Centre: Centre Eau Terre Environnement
Date de dépôt: 05 déc. 2016 20:42
Dernière modification: 11 janv. 2017 20:36
URI: http://espace.inrs.ca/id/eprint/3418

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