Purpose In order to study the composition changes and antioxidant activities of volatile components in Yunnan Arabica coffee beans during baking.
Method The change of volatile components in coffee beans during the roasting degree was determined by simultaneous-dist extraction and gas chromatography-mass spectrometry. The different volatile oils of coffee beans were evaluated by 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing power (FRAP) methods. The relationship between the antioxidant activity and the content of main volatile components were analyzed.
Result The contents of heterocyclic compounds increased distinctively during the roasting. Compared with the beginning of roast, the scavenging activities on DPPH and the antioxidant activity of FRAP were increased gradually.
Conclusion The antioxidant activity was highly correlated with the content of pyrrole, pyrazine, furan and phenol compounds.