Abstract
BackgroundContemporary biotechnology focuses on many problems related to the functioning of developed societies. Many of these problems are related to health, especially with the rapidly rising numbers of people suffering from civilization diseases, such as obesity or diabetes. One factor contributing to the development of these diseases is the high consumption of sucrose. A very promising substitute for this sugar has emerged: the polyhydroxy alcohols, characterized by low caloric value and sufficient sweetness to replace table sugar in food production.ResultsIn the current study, yeast belonging to the Yarrowia clade were tested for erythritol, mannitol and arabitol production using crude glycerol from the biodiesel and soap industries as carbon sources. Out of the 13 tested species, Yarrowia divulgata and Candida oslonensis turned out to be particularly efficient polyol producers. Both species produced large amounts of these compounds from both soap-derived glycerol (59.8–62.7 g dm−3) and biodiesel-derived glycerol (76.8–79.5 g dm−3). However, it is equally important that the protein and lipid content of the biomass (around 30% protein and 12% lipid) obtained after the processes is high enough to use this yeast in the production of animal feed.ConclusionsThe use of waste glycerol for the production of polyols as well as utilization of the biomass obtained after the process for the production of feed are part of the development of modern waste-free technologies.
Highlights
Contemporary biotechnology focuses on many problems related to the functioning of developed societies
We investigated the abilities of Yarrowia clade yeasts to use raw glycerol derived from the soap and biodiesel industries for biosynthesis of mannitol, arabitol and erythritol
Many of the aforementioned problems are related to health, especially with the spiraling numbers of people suffering from civilization diseases, such as obesity or diabetes
Summary
Contemporary biotechnology focuses on many problems related to the functioning of developed societies. Assimilation of different carbon sources (sugars, free fatty acids, triacylglycerols) and production of lipids by Yarrowia clade members have been investigated [34, 36]. The important advantage of SCP production using yeast is the utilization of waste or byproducts from other industries and simultaneous production of high value-added compounds [8]. Apart from potential biosynthesis of SCP, single cell oil (SCO) can be produced. Yeast can accumulate 20% to 80% of lipids inside the cell under nutrient-limiting conditions (nitrogen or phosphorus) with simultaneous excess of carbon source [9, 28]. Searching for new microorganisms and improvement of existing polyol biosynthesis methods lowering the production costs are of high interest
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