Figure 3 shows the formation of pyrazine compounds during the roasting process.All of these pyrazines identified are correlated with sensory attributes,such as roasty,nutty,popcorn-like,earthy,and potato-like(Maga and Sizer 1973;Maga 1992)that consequently contribute significantly to the typical aroma notes of roasted peanuts and therefore of ARPO.A total of 50 min of roasting time led to a significant increase in the formation of all these pyrazine compounds.