After the eluate was concentrated by Nanofilter membrane, it was passed through a column packed with the resin of Amberlite IRA67, a weakly basic ion-exchange resin on which DAC was adsorbed.

• 在经纳滤膜浓缩后；通过弱碱性离子交换树脂Amberlite IRA67吸附；以0.；5mol/L醋酸钠缓冲液洗脱；得到DAC纯度95%25；含量大于30g/L的去乙酰头孢菌素C的钠盐溶液；收率在90~95%25。