eactions can occur. The total volatile compounds in fresh and frozen-thawed radish samples are shown in Table 2. At the end of process, more than 50 volatile compounds were detected in the radish samples, including alcohols, aldehydes, ketones, esters and sulfurs and other compounds. The major volatiles identified in the present study were sulfur compounds in both fresh and thawed radish samples, which was also reported by Gao et al. The most abundant sulfur compound in the red radish was 4-isothiocyanato-1-(methylthio)-1-Butene. From Table 2, the most heavily affected compound was also 4-isothiocyanato-1-(methylthio)-1-Butene during freezing–thawing process.