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Valorization of crude glycerol as carbon source for the bioconversion of L‐phenylamine to 2‐phenylethanol by Yarrowia species
Author(s) -
Braga Adelaide,
Freitas Bruna,
Cordeiro Ana,
Belo Isabel
Publication year - 2021
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6849
Subject(s) - yarrowia , bioconversion , glycerol , chemistry , biotransformation , carbon source , yeast , bioreactor , food science , yeast extract , fermentation , organic chemistry , biochemistry , enzyme
BACKGROUND 2‐Phenylethanol (2‐PE) is an aromatic alcohol with a delicate fragrance of rose petals that is widely used in perfumes, cosmetics, foods, beverages, and pharmaceutical industries. The yeast Yarrowia can produce 2‐PE through L‐Phenylalanine (L‐Phe) biotransformation. However, it has not been properly explored in this field, despite its interesting characteristics for this process, such as the Crabtree negative trait. RESULTS This study explored the potential of different Yarrowia species ( Y. lipolytica W29, CH 1/5, and CH 3/4, as well as Y. divulgata M 445/4) for 2‐PE production. It was observed that all strains were inhibited by 2‐PE concentrations above 2 g L −1 , but only Y. lipolytica W29 was inhibited by 15 g L −1 L‐Phe. It was also confirmed that all strains were able to produce 2‐PE, with concentrations ranging from 1 to 2.2 g L −1 . Afterwards, crude glycerol was used as an alternative carbon source for 2‐PE production. All strains grew and produced 2‐PE on this carbon source, but CH 1/5 strain was selected for further studies because it allowed the highest 2‐PE throughput. The production of 2‐PE with CH 1/5 was further studied in bioreactor batch cultures, where a low accumulation of 2‐PE was observed. However, a step‐wise fed‐batch culture allowed an increase in the production of 2‐PE to 3.2 g L −1 . CONCLUSION To the best of the authors' knowledge, this value corresponds to the highest titer of 2‐PE obtained to date with Y. lipolytica . In this study, Y. lipolytica CH 1/5 is, for the first time, described as a good natural producer for 2‐PE. © 2021 Society of Chemical Industry (SCI).