Recent advances in the biological valorization of citrus peel waste into fuels and chemicals

Deokyeol Jeong, Heeyoung Park, Byeong Kwan Jang, Ye Bin Ju, Min Hye Shin, Eun Joong Oh, Eun Jung Lee, Soo Rin Kim

Research output: Contribution to journalReview articlepeer-review

66 Scopus citations

Abstract

In the quest to reduce global food loss and waste, fruit processing wastes, particularly citrus peel waste (CPW), have emerged as a promising and sustainable option for biorefinery without competing with human foods and animal feeds. CPW is largely produced and, as recent studies suggest, has the industrial potential of biological valorization into fuels and chemicals. In this review, the promising aspects of CPW as an alternative biomass were highlighted, focusing on its low lignin content. In addition, specific technical difficulties in fermenting CPW are described, highlighting that citrus peel is high in pectin that consist of non-fermentable sugars, mainly galacturonic acid. Last, recent advances in the metabolic engineering of yeast and other microbial strains that ferment CPW-derived sugars to produce value-added products, such as ethanol and mucic acid, are summarized. For industrially viable CPW-based biorefinery, more studies are needed to improve fermentation efficiency and to diversify product profiles.

Original languageEnglish
Article number124603
JournalBioresource Technology
Volume323
DOIs
StatePublished - Mar 2021

Keywords

  • Autohydrolysis
  • Galacturonic acid
  • Meso-galactaric acid
  • Pectin-rich biomass
  • Saccharomyces cerevisiae

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