Antioxidant Capacity of Carotenoid Extracts from the Haloarchaeon <i>Halorhabdus utahensis</i>
Herein, we report on the production, characterization, and antioxidant power assessment of carotenoids from the haloarchaeon <i>Halorhabdus utahensis</i>. It was grown at 37 °C and 180 rpm agitation in halobacteria medium supplemented with glucose, fructose, and xylose, each at concentra...
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| Main Authors: | , , , , , , |
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| Format: | Book |
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MDPI AG,
2023-10-01T00:00:00Z.
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| Summary: | Herein, we report on the production, characterization, and antioxidant power assessment of carotenoids from the haloarchaeon <i>Halorhabdus utahensis</i>. It was grown at 37 °C and 180 rpm agitation in halobacteria medium supplemented with glucose, fructose, and xylose, each at concentrations of 0.2%, 1%, and 2%, and the carotenoid yield and composition were investigated. The microorganism produced the carotenoids under all the conditions tested, and their amount followed the order glucose < xylose < fructose. The highest yield was achieved in 2% fructose growth medium with 550.60 ± 7.91 μg/g dry cell and 2428.15 ± 49.33 μg/L. Separation and identification of the carotenoids were performed by RP-HPLC and HPLC/APCI-ITMS<sup>n</sup>. Bacterioruberin was the main carotenoid detected and accounted for 60.6%, 56.4%, and 58.9% in 2% glucose, 1% xylose, and 2% fructose extracts, respectively. Several geometric isomers of bacterioruberin were distinguished, and representatives of monoanhydrobacterioruberin, and bisanhydrobacterioruberin were also detected. The assignment to <i>cis</i>-isomers was attempted through analysis of the UV/Vis spectra, intensity of <i>cis</i> peaks, and spectral fine structures. The extracts exhibited superoxide scavenging activity higher than butylhydroxytoluene, ascorbic acid, and Trolox, selected as antioxidant references. The anti-hyaluronidase capacity was investigated, and the 2% fructose extract showed the highest activity reaching 90% enzyme inhibition with 1.5 μg. The overall data confirm that <i>Hrd. utahensis</i> can be regarded as an interesting source of antioxidants that can find applications in the food and cosmetic sectors. |
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| Item Description: | 10.3390/antiox12101840 2076-3921 |