Evaluation of agro-food byproducts for gluconic acid production by Aspergillus niger ORS-4.410

O. V. Singh, N. Kapur, R. P. Singh

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Certain cost-effective carbohydrate sources in crude as well as after purification were utilized as the sole sources of carbon for gluconic acid production using Aspergillus niger ORS-4.410 under submerged fermentation. Crude grape must (GM) and banana-must (BM) resulted into significant levels of gluconic acid production i.e. 62.6 and 54.6 g/l, respectively. The purification of grape and banana-must led to a 20-21% increase in gluconic acid yield. Molasses as such did not favour gluconate production (12.0 g/l) but a significant increase in production (60.3 g/l) was observed following hexacyanoferrate (HCF) treatment of the molasses. Rectified grape must (RGM) appeared to be best suitable substrate which after 144 h resulted in 73.2 g of gluconic acid/l with 80.6% yield followed by the yield obtained from the rectified banana must (RBM) (72.4%) and treated cane molasses (TM) (61.3%). Abundant growth of mould A. niger ORS-4.410 was observed with crude grape (0.131 g/l/h) and banana must (0.132 g/l/h).

Original languageEnglish (US)
Pages (from-to)519-524
Number of pages6
JournalWorld Journal of Microbiology and Biotechnology
Issue number4
StatePublished - Jun 2005


  • Aspergillus niger
  • Banana-must
  • Batch fermentation
  • Gluconic acid
  • Grape-must
  • Molasses

ASJC Scopus subject areas

  • Biotechnology
  • Physiology
  • Applied Microbiology and Biotechnology


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