Abstract
Starch containing wastewaters from the food and feed industry have been identified as potential cheap carbon sources for the production of microbial lipids. Due to its high potential lipid content the oleaginous yeast Rhodotorula glutinis is often used for fermentations in this field. Moreover it is investigated in the context of microbial carotenoid production, which also requires a cheap source of carbon. Thus, the ability of R. glutinis (ATCC 15125TM) to degrade and utilize soluble starch for the production of lipids has been assessed in this study. While glucose and fructose were readily consumed from the medium, starch was only slightly reduced in one treatment. The yield of fatty acid methyl esters (FAME) was graduated corresponding to the initial sugar contents, with the highest FAME yield (1.5 g·L-1) at the highest initial sugar content. In the treatment that contained starch as single carbon source, no FAME production was realized. Accordingly, if starchy wastewaters should be used for microbial cultivation with R. glutinis, an enzymatic or chemical pretreatment for starch hydrolysis should be applied, to increase the availability of this carbon source.
Highlights
Worldwide, renewable biofuels such as bioethanol and biodiesel contribute a significant share to the overall fuel consumption [1]
Starch containing wastewaters from the food and feed industry have been identified as potential cheap carbon sources for the production of microbial lipids
While glucose and fructose were readily consumed from the medium, starch was only slightly reduced in one treatment
Summary
Renewable biofuels such as bioethanol and biodiesel contribute a significant share to the overall fuel consumption [1]. Research and industry strived to find alternative oil sources for the transesterification into biodiesel In this context the utilization of oils produced by oleaginous microorganisms has been identified and investigated as one possible approach. In terms of microbial lipid production, the red yeast Rhodotorula glutinis has been studied due to its high potential oil content of up to 72% [4] It has been investigated for its ability to produce high value carotenoids, namely β-carotene, torulene and torularhodin, which can be utilized as natural colorants or as ingredients of pharmaceutical products due to their antioxidant and pro-vitamin A properties. A lot of these substrates contain starch as a JSBS
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