factor in Japanese and Korean soy sauces has clarified 25 key aroma compounds in five different types of Japanese soy sauces, and found that some key aroma-active compounds showed significantly different contributions to these five types of soy sauce has reported that alcohols and pyrazine were the intense aroma-active compounds in fermented and acid-hydrolysed Korean soy sauce, respectively. Fifty-six key odorants were detected in all and 16 odorants were found in both types of soy sauce, whereas 21 and 19 compounds were detected only in Japanese and Korean soy sauces, respectively The number of aroma-active pyrazines in Korean soy sauce is higher than those in Japanese soy sauce, while the esters might be the characteristic key odorants in Japanese soy sauce. Different sampling techniques have been developed to collect
aroma prior to GC-O analysis. SPME is a quick, solvent-free, and quite simple technique that requires very little sample manipulation. SPME-AEDA has been applied to the analysis of aroma compounds on many different kinds of foods, such as roasted pistachio and soybean paste. Furthermore, SPME-AEDA has been demonstrated to be a good alternative to obtain representative aroma extracts with a wide range of odorant