Abstract
Orange peel waste (OPW), the primary byproduct of the juice extraction process, is annually generated in massive amounts (21 Mton), and its aqueous extraction in biorefining operations yields a liquid fraction, referred to as orange peel extract (OPE). Although OPE contains significant amounts of easily assimilable carbohydrates, such as fructose, glucose, and sucrose, no investigations have been conducted yet to assess its possible use in biodiesel production by oleaginous yeasts. Consequently, the objective of the present study was to assess whether OPE might act as the basis of a liquid medium for microbial lipid production. A screening conducted with 18 strains of oleaginous yeasts in shaken flask on the OPE-based medium showed that Rhodosporidium toruloides NRRL 1091 and Cryptococcus laurentii UCD 68-201 gave the best results in terms of lipid production (5.8 and 4.5 g L−1, respectively) and accumulation (77 and 47% on a dry matter basis, respectively). The subsequent scale transfer of the process to a 3-L STR operated in batch mode halved the time required to reach the lipid peak with the ensuing increase in volumetric productivities in R. toruloides NRRL 1091 (3646 mg L−1 day−1) and C. laurentii UCD 68-201 (2970.7 mg L−1 day−1). The biodiesel yields from the lipids of the former and the latter strain were 36.9 and 31.9%, respectively. Based on multivariate analysis of fatty acid methyl ester compositions, the lipids from the former and the latter strain were highly resembling those of Jatropha and palm oils, two commonly used feedstocks for biodiesel manufacturing.
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Funding
This study was funded by the Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR) within the project “Piano Operativo Nazionale Biofeedstock” (grant no. ARS01_00985).
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Carota, E., Petruccioli, M., D’Annibale, A. et al. Orange peel waste–based liquid medium for biodiesel production by oleaginous yeasts. Appl Microbiol Biotechnol 104, 4617–4628 (2020). https://doi.org/10.1007/s00253-020-10579-y
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DOI: https://doi.org/10.1007/s00253-020-10579-y