Occurrence of dicarboxylic (dioic) acids in some Mediterranean nuts

A GC–MS method was developed for the determination of 26 minor dicarboxylic (dioic) acids (from 1.87 to 7.79%) in seven species of Mediterranean nuts growing in Israel. The occurrence of hydroxy, methoxy, branched, and unsaturated dioic acids in nuts has been studied. Together with known acids (C3:0–C22:0), unusual dicarboxylic acids were identified by gas chromatography/mass spectrometry.