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Open AccessArticle

Biodiesel-Derived Glycerol Obtained from Renewable Biomass—A Suitable Substrate for the Growth of Candida zeylanoides Yeast Strain ATCC 20367

1
Institute of Life Sciences, Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, Calea Mănăștur 3-5, 400372 Cluj-Napoca, Romania
2
Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Calea Mănăștur 3-5, 400372 Cluj-Napoca, Romania
3
CENCIRA Agrofood Research and Innovation Centre, 6/66 Ion Meșter Street, 400650 Cluj-Napoca, Romania
*
Authors to whom correspondence should be addressed.
Microorganisms 2019, 7(8), 265; https://doi.org/10.3390/microorganisms7080265
Received: 6 August 2019 / Revised: 14 August 2019 / Accepted: 15 August 2019 / Published: 16 August 2019
(This article belongs to the Section Microbial Biotechnology)
Used kitchen oil represents a feasible and renewable biomass to produce green biofuels such as biodiesel. Biodiesel production generates large amounts of by-products such as the crude glycerol fraction, which can be further used biotechnologically as a valuable nutrient for many microorganisms. In this study, we transesterified used kitchen oil with methanol and sodium hydroxide in order to obtain biodiesel and crude glycerol fractions. The crude glycerol fraction consisting of 30% glycerol was integrated into a bioreactor cultivation process as a nutrient source for the growth of Candida zeylanoides ATCC 20367. Cell viability and biomass production were similar to those obtained with batch cultivations on pure glycerol or glucose as the main nutrient substrates. However, the biosynthesis of organic acids (e.g., citric and succinic) was significantly different compared to pure glycerol and glucose used as main carbon sources. View Full-Text
Keywords: renewable biomass; used kitchen oil; crude glycerol; organic acids; Candida zeylanoides; fermentations renewable biomass; used kitchen oil; crude glycerol; organic acids; Candida zeylanoides; fermentations
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MDPI and ACS Style

Mitrea, L.; Ranga, F.; Fetea, F.; Dulf, F.V.; Rusu, A.; Trif, M.; Vodnar, D.C. Biodiesel-Derived Glycerol Obtained from Renewable Biomass—A Suitable Substrate for the Growth of Candida zeylanoides Yeast Strain ATCC 20367. Microorganisms 2019, 7, 265.

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