As each extraction procedure used the same bu†ers for the extraction of non-glutenin fractions, few di†erences were observed between the amount of albumins- globulins, amphiphilic proteins and gliadins (Table 1). Triton X114 was employed because it has been shown previously that its incorporation allowed the extraction of lipids and lipid binding proteins together with albu- mins and globulins. Furthermore, the fraction extracted with 70% ethanol contained only traces of glutenins (Blochet et al 1991). On the experiments carried out on Gabo, a wheat cultivar with a high protein content (17É8% DWB), the gliadin fraction was the combined step of an extraction with 30 ml of 70% ethanol and a rinse of the pellet with 10 ml of 70% ethanol. With cultivars of medium protein content (about 10% DWB), no signiÐcant di†erence was found between the gliadin content obtained with or without a rinse (data not shown). The rinsing step was thus omitted from the analysis method for the 45 culti- vars.