The composition and content of flavor precursor compounds in green coffee beans from Dehong, Baoshan, Lincang, and Pu-erh were analyzed using one-way analysis of variance(ANOVA) and principal component analysis(PCA). Thus, the differences in green coffee beans from different geographical origins were studied interms of flavor precursor compounds. The highest and lowest levels of total amino acid content were found in Dehong coffee(10.31%) and Baoshan coffee(9.07%), respectively, while the protein and amino ...