Vol. 32 No. 2 (2019): Revista ION
Articles

Evaluation of hydrolyzed whey proteins as a nitrogen source in the lactic fermentation of lactose

Paula Andrea Duarte-Manchego
Universidad Industrial de Santander
Juan Carlos González-Téllez
Universidad Industrial de Santander
Carlos Jesús Muvdi Nova
Universidad Industrial de Santander

Published 2019-11-12

Keywords

  • Hydrolysates,
  • Whey Protein,
  • Fermentation,
  • Lactobacillus Casei ATCC 393,
  • Lactic Acid,
  • Yeast Extract.
  • ...More
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How to Cite

Duarte-Manchego, P. A., González-Téllez, J. C., & Muvdi Nova, C. J. (2019). Evaluation of hydrolyzed whey proteins as a nitrogen source in the lactic fermentation of lactose. Revista ION, 32(2), 15–27. https://doi.org/10.18273/revion.v32n2-2019002

Abstract

A strategy for the utilization and valorization of whey proteins resulting from curd manufacturing process out of sour milk was evaluated. The stages of precipitation (thermal and acid denaturation) and enzymatic hydrolysis were considered for later use as a nitrogen source in lactose fermentation to obtain lactic acid. Tests were carried out modifying the hydrolysis pH and Temperature, finding a molecular size lower than 6.5kDa for the hydrolysates at a pH of 10 and 60°C. Such hydrolysates were used in lactic acid fermentation with Lactobacillus casei ATCC 393, at concentrations of 1% w/w and 7% w/w, using 1% w/w yeast extract as reference. Microbial growth (3.0*109 & 1.7*109 CFU/cm3), product/substrate yield (0.78 & 0.76 g/g) and productivity (0.41 & 0.30g/dm3.h) were similar for media with yeast extract and hydrolysate at 1%w/w, respectively, while hydrolysate at 7% w/w showed some inhibition, possibly related to high total nitrogen content in the medium, which was appreciated in the response variables already mentioned (5*108 CFU/cm3, 0.53g/g & 0.18g/dm3.h). These primary results show the potential use of this by-product in lactic fermentation.

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