the effect of moisture content on the progress of the Maillard reaction, caramelization and generation of heat induced contaminants. the concentration of HMF was highly affected by the residual moisture content of a bread slice. In addition pointed out that the water activity of 0.4 is critical, since it reflects a stage in baking where temperature begins to rise above 100 C, which greatly accelerates HMF formation. In our study, the moisture content decreased rapidly during heating. Residual moisture content of 6.48% was reached within 50 s of heating at 110 C