Mytiloxanthin and isomytiloxanthin, two novel acetylenic carotenoids

Structure of New Carotenoids with a 3,4-Dihydroxy-.BETA.-End Group from the Oyster Crassostrea gigas

“…Treatment of 1 with 5% KOH/C 2 H 5 OH showed reversible hypsochromic shift 15 nm and reduction of 1 with NaBH 4 gave a pentaol, having absorption maxima at 405, 429, and 465 nm. These visible spectral properties were in agreement with the presence of a mytiloxanthin type chromophore 6,16) in 1. The 1 H-NMR data for 1 indicated the presence of a 3,4-(cis)-dihydroxy-b-end group (C-1 to C-6 including C-16, 17, and 18), 10,17) an 6-oxo-3-hydroxy-k-end group (C-1Ј to C-6Ј including C-16Ј, 17Ј, and 18Ј), and a polyene chain containing an enolic group (d 16.3, s, H-8Ј).…”

Isolation and Identification of Amarouciaxanthin A from the Bivalve Paphia euglypta (Sudaregai in Japanese)

“…These data were superimposable with those of amaroucia xanthin A isolated from A. pliciferum. Furthermore, (1) did not separate from authentic amarouciaxanthin A on mixed TLC and high performance liquid chro matography [Sumipax OA-2000 as stationary phase, n-hexane-CH2C12-ethanol (48: 16: 2) as mobile phase].8) Therefore, based on these results described above (1) has been shown to be identical with amarouciaxanthin A. This is the first report of the occurrence of amarouciaxanthin A in shellfishes.…”

“…(3: 7). (1) showed absorption maxima at 230, 269, and 455-460 nm (in ether). MS m/z 614 (M+, C40145405, 1%), 596 (M+-18, 2 %), 578 (M+-18-18, 4%), 560 (M+-18-18-18, 1%), and 444 (M+-170, base peak).…”

A Review of Pigments Derived from Marine Natural Products

“…It was reported that mytiloxanthin was converted from fucoxanthin through a pinacol‐like rearrangement. Mytiloxanthin presents as yellow and the maximum UV‐VIS absorption values of the mytiloxanthin is 484 nm . Takashi Maoka et al.…”

“…Mytiloxanthin presents as yellow and the maximum UV-VIS absorption values of the mytiloxanthin is 484 nm. [22] Takashi Maoka et al synthesized mytiloxanthin and studied its anti-oxidative activities and found that the compound showed excellent scavenging activity for hydroxyl radicals. [23] Caroline Utermann et al isolated an Alloxanthin analogue (8) from mussels (Mytilus spp.)…”