During blanching, the WSP content of BSS increased initially and then decreased gradually, reaching the highest value at 3 min. This may be caused by decomposition of some PP into WSP during the initial blanching. However, with the progressing of blanching, WSP in BSS was dissolved into boiling water gradually, thus decreasing its content gradually. Canet et al. (2005) studied the effect of blanching on total pectin and WSP contents in Green beans, finding that Green beans heated at 70 °C exhibited a reduction in the WSP fraction and a slight increase in esterification in 2.5 min. This indicated that the pectin components in vegetables indeed can be changed by blanching treatment