Update on trimethylamine N-oxide (TMAO) as a piezolyte and cryoprotectant: its role in a depth limit for marine fishes and loss from hadal fish during capture حسب Paul Yancey (14354982)

"…Xu et al. used both TFA and ion-exchange steps. However, the exchange resin and pH are not described, and effect of the resin plus TFA on TMAO recovery is not known to my knowledge.…"