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1 叶绿体中色素的提取 “叶绿体中色素的提取和分离”是高中生物的重要实验之一。笔者认为,实验中保证色素提取液的浓度和纯度是使实验成功的前提。课本上介绍用研磨过滤的方法提取色素,滤液中往往混有细小的叶渣和石英颗粒,从而堵塞毛细玻璃管;又因学生使用研钵不够熟练,丙酮挥发却较快,故往往所得的滤液浓度小,实验结果不够理想。
1 Extraction of Pigments in Chloroplasts “Extraction and isolation of pigments in chloroplasts” is one of the most important experiments for high school organisms. The author believes that ensuring the concentration and purity of the pigment extract in the experiment is a prerequisite for the success of the experiment. Textbook describes the use of grinding and filtering methods to extract pigments, the filtrate is often mixed with small leaf residue and quartz particles, thus blocking the capillary glass tube; and because the students use the mortar is not skilled enough, acetone volatilization is faster, it is often obtained filtrate The concentration is small and the experimental results are not ideal.