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Neurosporaxanthin Overproduction by and Evaluation of Its Antioxidant Properties. | LitMetric

AI Article Synopsis

Article Abstract

Neurosporaxanthin (NX) is a carboxylic carotenoid produced by some filamentous fungi, including species of the genera and . NX biosynthetic genes and their regulation have been thoroughly investigated in , an industrial fungus used for gibberellin production. In this species, carotenoid-overproducing mutants, affected in the regulatory gene , exhibit an upregulated expression of the NX pathway. Based on former data on a stimulatory effect of nitrogen starvation on carotenoid biosynthesis, we developed culture conditions with mutants allowing the production of deep-pigmented mycelia. With this method, we obtained samples with ca. 8 mg NX/g dry mass, in turn the highest concentration for this carotenoid described so far. NX-rich extracts obtained from these samples were used in parallel with -complemented NX-poor extracts obtained under the same conditions, to check the antioxidant properties of this carotenoid in in vitro assays. NX-rich extracts exhibited higher antioxidant capacity than NX-poor extracts, either when considering their quenching activity against [O()] in organic solvent (singlet oxygen absorption capacity (SOAC) assays) or their scavenging activity against different free radicals in aqueous solution and in liposomes. These results make NX a promising carotenoid as a possible feed or food additive, and encourage further studies on its chemical properties.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7346100PMC
http://dx.doi.org/10.3390/antiox9060528DOI Listing

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