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The foamy substances cover foam protein, polypeptide, isohumulone, melanoid, metal ions, amylase, alcohol and barm etc. 使啤酒形成泡沫的物質有泡沫蛋白和多肽、異葎草酮、類黑素、金屬離子、多糖、酒精、二氧化碳及酵母等。