中文摘要：

参照美国谷物化学家协会标准方法（AACC22—85），以L—DOPA为底物，测定了22份小麦样品其籽粒的PPO活性，发现测定结果的重复性较差。在籽粒PPO活性测定原理的基础之上，优化了测定参数，改进、完善了一种评价小麦全粉PPO活性的新方法，其操作简便、快速，实验结果的重复性好、稳定性高，与籽粒PPO活性的测定结果极显著相关。

英文摘要：

According to an approved method of the American Association of Cereal Chemists （AACC 22-85）, polyphenol oxidase （PPO） levels in wheat kernels （L-DOPA substrate） of 22 varieties were evaluated with low repeatability. Based on the principle of the whole-seed method, a simple and convenient assay for PPO activity in whole-wheat flour was developed, the repeatability and distinguishability were greatly improved in comparison with the whole-seed method. There was a strong linear relationship between the two above mentioned methods.