Abstract:
:In this study, the carotenoids produced by the extremophile microorganisms Halococcus morrhuae, Halobacterium salinarium and Thermus filiformis were separated and identified by high-performance liquid chromatography connected to a diode array detector and a tandem mass spectrometer. The in vitro scavenging capacity of the carotenoid extracts against radical and non-radical species was evaluated. In halophilic microorganisms, the following carotenoids were identified: bacterioruberin, bisanhydrobacterioruberin, trisanhydrobacterioruberin and their derivatives. In the thermophilic bacterium, the carotenoids all-trans-zeaxanthin, zeaxanthin monoglucoside, thermozeaxanthins and thermobiszeaxanthins were identified. The antioxidant capacities of the carotenoid extracts of H. morrhuae (trolox equivalent antioxidant capacity = 5.07 and IC(50) = 0.85 μg mL(-1)) and H. salinarium (trolox equivalent antioxidant capacity = 5.28 and IC(50) = 0.84 μg mL(-1)) were similar and higher than those of the bacterium T. filiformis (trolox equivalent antioxidant capacity = 2.87 and IC(50) = 2.41 μg mL(-1)). This difference is related to the presence of acyclic carotenoids with both large numbers of conjugated double bounds and of hydroxyl groups in the major carotenoid of the halophilic microorganisms.
journal_name
World J Microbiol Biotechnoljournal_title
World journal of microbiology & biotechnologyauthors
Mandelli F,Miranda VS,Rodrigues E,Mercadante AZdoi
10.1007/s11274-011-0993-ysubject
Has Abstractpub_date
2012-04-01 00:00:00pages
1781-90issue
4eissn
0959-3993issn
1573-0972journal_volume
28pub_type
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