Abstract
Incessant research on single cell oils (SCO) has revealed it as a vital sustainable source of rare fatty acids and high value lipids. India is one of the largest global producer of paddy and generates around 130 MT of energy dense lignocellulosic straw, which can be converted into myriad of high-value products. In this context present work demonstrates conversion of rice straw into nutritionally important caprylic-acid rich SCO with concomitant recycling of residual broth for increasing product to effluent discharge ratio along with co-production of singe-cell protein (SCP). Oleaginous yeast isolates Geotrichum candidum NBT-1 and Pichia kudriavzevii NBT-13 employed in the work exhibited co-utilization and simultaneous consumption of glucose and xylose (pre-dominant sugars in lignocellulosic hydrolysates). G. candidum displayed higher lipid titre (5.745 g/L) and biomass concentration (14.88 g/L) in 1:1 combination of non-detoxified rice straw liquid hydrolysate (NDLH) and synthetic media compared with titre (4.32 g/L) and biomass concentration (8.61 g/L) obtained in synthetic media (control). P. kudriavzevii could not endure NDLH and kinetics revealed initiation of lipid-turnover after 168th h. Residual broth was 100% recycled without fresh carbon supplementation resulting in additional lipid titre and yield of 2.45 g/L and 8.12% from G. candidum, in two consecutive fermentations. Defatted biomass from both isolates was 48.66 (NBT-1) and 37.11% (NBT-13) protein rich, a suitable SCP candidate as food or feed supplement. Derived SCO were 70–90% predominant in medium chain fatty acid-caprylic acid, recognized for its ever-increasing nutraceutical and medical benefits with concomitant production of SCP biomass.
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Authors acknowledge SICART Gujarat for conducting GC analysis and BioRaj laboratories, Nagpur for conduction total N, P & K analysis of Biomass.
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Conceptualization, formal analysis, project administration of research have been done by Batul Diwan, first author and Dr. Pratima Gupta, corresponding author together. B Diwan did the data curation, experimental investigation. Dr. P Gupta, corresponding author, supervised and validated the work. Original draft was written by B Diwan, reviewed by Dr. P Gupta and edited by both the authors.
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Diwan, B., Gupta, P. Conversion of Rice straw to caprylic acid-rich microbial oils by oleaginous yeast isolates. Biomass Conv. Bioref. 12, 5901–5914 (2022). https://doi.org/10.1007/s13399-020-01039-8
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DOI: https://doi.org/10.1007/s13399-020-01039-8