2 an oxidized electron donor + 2 H2O + β-carotene → 2 a reduced electron donor + isozeaxanthin
oxygen + β-carotene → 2 all-trans-retinal
a reduced electron donor + oxygen + β-carotene → an oxidized electron donor + β-carotene 15,15' epoxide + H2O
oxygen + β-carotene → 11-cis-retinal + all-trans-retinal
2 oxygen + β-carotene → 2 β-ionone + 4,9-dimethyldodeca-2,4,6,8,10-pentaene-1,12-dial
NADH + H+ + oxygen + β-carotene → β-cryptoxanthin + H2O + NAD+
2 NADH + 2 H+ + 2 oxygen + β-carotene → 2 H2O + 2 NAD+ + zeaxanthin
oxygen + β-carotene → β-ionone + all-trans-10'-apo-β-carotenal
2 oxygen + 4 a reduced ferredoxin [iron-sulfur] cluster + 4 H+ + β-carotene → 2 H2O + 4 an oxidized ferredoxin [iron-sulfur] cluster + zeaxanthin
2 an oxidized electron donor + β-carotene → 2 a reduced electron donor + 3,4,3',4'-tetradehydro-β,β-carotene
2 an oxidized electron donor + β-carotene → 2 a reduced electron donor + β,χ-carotene
a reduced electron donor + oxygen + β-carotene → an oxidized electron donor + isocryptoxanthin + H2O
2 a reduced ferredoxin [iron-sulfur] cluster + 2 H+ + oxygen + β-carotene → 2 an oxidized ferredoxin [iron-sulfur] cluster + β-cryptoxanthin + H2O
2 NADH + 2 H+ + 2 oxygen + β-carotene → 2 H2O + 2 NAD+ + (2R,2'R)-dihydroxy-all-trans-β-carotene
2 H2O + β-carotene → zeaxanthin
2 an oxidized electron donor + β-carotene → 2 a reduced electron donor + β-isorenieratene
2 a reduced electron donor + 2 oxygen + β-carotene → 2 an oxidized electron donor + 3 H2O + echinenone