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This is the first account of the kinetics of free radical scavenging by bacterioruberin obtained from cells of  Haloferax alexandrinus  GUSF-1(KF796625), grown at optimum conditions of 25% NaCl, pH 7, 42 °C, 150 rpm in NaCl Tryptone yeast extract medium and light. Bacterioruberin separated from methanolic extract displayed characteristics absorption peaks at 368, 386, 463, 492 and 525 nm and gave an  m / z  value of 740.4 (C 50 H 76 O 4 ) in Liquid Chromatography-Mass Spectroscopy validating its purity. Bacterioruberin (13 µM) decolorized and decayed 0.2 mM 1,1-diphenyl-2-picrylhydrazyl radicals (DPPH • ) monitored at 517 nm and reached a steady state within 30 min. An EC 50  of 6.50 µM ± 0.27 (4.81 µg/mL ± 0.2) was deduced for the 0.2 mM DPPH • -bacterioruberin reaction using the GraphPad Prism 9 statistical software and employing the right-angled triangle technique. The study also revealed a comprehensive information of the total kinetic activity of bacterioruberin with DPPH • : the antioxidant activity index was 16.38 ± 0.67; time needed to reach the steady state with the added EC 50 —30 min; the antiradical power 30.77 ± 1.27 and the antiradical efficiency of 54.7 × 10 –3  ± 2.24, thus reflecting  the strong antioxidant nature of bacterioruberin. Scavenging of DPPH •  by bacterioruberin was a pseudo-first-order reaction with a rate constant  k  2  of 2.76 × 10 –5  ± 0.001 µM −1  s −1  calculated at  t  = 0 or initial time and  t  = 30 min. The knowledge of the kinetics of bacterioruberin to scavenge DPPH •  adds to its effective application as an antioxidant in medicinal use, pharmaceutical products and others. Additionally, the use of simple conventional method of DPPH •  free radical scavenging, monitored using  an easily available laboratory spectrophotometer, will certainly help in the effective use of any antioxidant compound.

Kinetics of DPPH• scavenging by bacterioruberin from Haloferax alexandrinus GUSF-1 (KF796625)