Water‐soluble arsenic residues from several arsenolipids occurring in the tissues of the starspotted shark Musterus manazo

Alkali‐labile and alkali‐stable arsenolipid fractions were prepared from 12 tissues of the starspotted shark Musterus manazo and analyzed by high‐performance liquid chromatography–inductively coupled mass spectrometry. At least six arsenolipids were found in the shark. Two major alkali‐labile arsenolipids (a dimethylated arsenic‐containing lipid and an arsenocholine‐containing lipid) were shown in ordinary muscle, dark muscle, heart, bone, skin and stomach, whereas a single major arsenolipid, the dimethylated arsenic‐containing lipid, was shown in the intestine, liver, kidney, spleen and brain. Besides these lipids, four other minor alkali‐labile arsenolipids were present. On the other hand, as for the alkali‐stable arsenolipids, a dimethylated arsenic‐containing lipid and an arsenocholine‐containing lipid were also found in dark muscle, skin, stomach and intestine, whereas only dimethylated arsenic‐containing lipid was found in the liver.