Bioconversion of potato-processing wastes into an industrially-important chemical lactic acid

Juliana de Oliveira, Luciana Porto de Souza Vandenberghe, Priscilla Zwiercheczewski de Oliveira, Ariane Fátima Murawski de Mello, Cristine Rodrigues, Poonam Singh - Nee Nigam, Vincenza Faraco, Carlos Ricardo Soccol

Research output: Contribution to journalArticlepeer-review


Lactic acid (LA) is an important biomolecule applied in food, pharmaceutical and chemical areas, mainly to
produce biodegradable polymers, such as poly–lactic acid (PLA). In this work, an efficient fermentative process
for LA production was developed using potato processing waste (PPW) hydrolysate with Lactobacillus pentosus.
After optimization and kinetics studies, LA production reached 150 g/L with a productivity of 1.6 g/L.h in
Erlenmeyer flasks. LA production was also conducted in STR where 110 g/L were reached with a productivity of
2.4 g/L.h. LA recovery consisted of a clarification step, with powdered activated carbon, with further precipitation
at low temperature and acidification of calcium lactate for conversion to LA. The process was effective for
contaminants’ removal and clarification, and LA concentration to 416 g/L. Good perspectives for LA production,
recovery and clarification were observed. Future studies will be carried out for LA purification and polymerization
for PLA synthesis.
Original languageEnglish
Article number100698
Number of pages7
JournalBioresource Technology Reports
Publication statusPublished - 16 Apr 2021


  • potato processing waste ; lactic acid; Lactobacillus pentosus; calcium lactate; stirred tank reactor
  • lactic acid
  • Lactobacillus pentosus
  • stirred tank reactor
  • calcium lactate


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