Neomeris annulata, Dickie, 1874

Kurth, Caroline, Welling, Matthew & Pohnert, Georg, 2015, Sulfated phenolic acids from Dasycladales siphonous green algae, Phytochemistry 117, pp. 417-423 : 418

2.3. Sulfated metabolites of N. annulata

In N. annulata we detected two closely eluting metabolites, with identical pseudomolecular ions of [M–H] – = 259 and each with a fragment of [M–H–80] –. These metabolites were not detectable anymore shortly after wounding. Molecular weight and MS/MS spectra would be in accordance with a mono sulfated dihydroxycinnamic acid, such as caffeic acid or a positional isomer. We therefore synthesized the sulfated 3,4-, 2,3-, 2,4- and 2,5 dihydroxycinnamic acid derivatives, but despite very similar retention times and MS/MS fragmentation patterns identity to the natural products could not be confirmed.