TY - JOUR
T1 - Recent advances in the biological valorization of citrus peel waste into fuels and chemicals
AU - Jeong, Deokyeol
AU - Park, Heeyoung
AU - Jang, Byeong Kwan
AU - Ju, Ye Bin
AU - Shin, Min Hye
AU - Oh, Eun Joong
AU - Lee, Eun Jung
AU - Kim, Soo Rin
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/3
Y1 - 2021/3
N2 - 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.
AB - 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.
KW - Autohydrolysis
KW - Galacturonic acid
KW - Meso-galactaric acid
KW - Pectin-rich biomass
KW - Saccharomyces cerevisiae
UR - http://www.scopus.com/inward/record.url?scp=85099663466&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2020.124603
DO - 10.1016/j.biortech.2020.124603
M3 - Review article
C2 - 33406467
AN - SCOPUS:85099663466
SN - 0960-8524
VL - 323
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 124603
ER -