Corrigendum to "Scaffolds of bioactive glass (Bioglass®) combined with recombinant human bone morphogenetic protein -9 (rhBMP-9) for tooth extraction site preservation" [Heliyon 8 (1) (January 2022) e08796].

[This corrects the article DOI: 10.1016/j.heliyon.2022.e08796.].

Dissolved-oxygen feedback control fermentation for enhancing ß-carotene in engineered Yarrowia lipolytica.

The DO-stat fed-batch fermentation was carried out to explore the volumetric productivity of ß-carotene in engineered Yarrowia lipolytica C11 strain. Using DO-stat fed-batch fermentation, we achieved 94 g/L biomass and 2.01 g/L ß-carotene. Both biomass and ß-carotene were about 1.28-fold higher than that in fed-batch fermentation. The ATP, NADP+/NADPH, and gene expression levels of tHMG, GGS1, carRA, and carB were promoted as compared to that in fed-batch fermentation. As for as the kinetic parameters in DO-stat fed-batch fermentation, µm', Yx/s', and Yp/s' was 0.527, 0.353, and 0.158, respectively. The µm' was elevated 4.66-fold than that in fed-batch fermentation. These data illustrate that more dissolved oxygen increased the biomass. The Yx/s' and Yp/s' were increased 1.15 and 22.57-fold, which suggest that the DO-stat fed-batch fermentation reduced the Crabtree effect and improved the utilization rate of glucose. Therefore, DO-stat fed-batch fermentation is a promising strategy in the industrialized production of ß-carotene.