The difference of the interaction between phenolic compounds and protein with diverse polymerization degrees in different red wines was investigated to find out the key components of astringency for improving the wine-making process and selecting grape varieties.Using the different varieties of red wines as material,the phenolic substances of wine were divided into three parts by C18 solid phase extraction column:monophenols,oligomers and polymers.The contents of total phenols and total flavanols were deter...