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作者因工作需要,曾对湖南产茶区制茶废液干渣进行了初步的分析与提取实驗。此項干渣經作者採用昇华法、紫尿酸銨反应、熔点法等加以試驗,証明其中含有咖啡因。为便于測定样品中咖啡因的含量,作者並用干燥法测定了样品的水分,同时又进行了样品的灰分測定,此外尚作了含量测定与提取的实驗,方法如下: 含量测定:精密秤取样品粉末约10克,置500毫升燒杯中,加蒸溜水400毫升,时时攪拌,加热煮沸一小时,再加入新沉淀的Fe(OH)_3約3—5克,温浸半小时,冷却后移
Based on the needs of the work, the author conducted preliminary analysis and extraction experiments on the dry residue from the production of tea waste from tea production areas in Hunan. The dry residue was tested by the authors using the sublimation method, ammonium uronic acid reaction, and melting point method to prove that it contains caffeine. In order to facilitate the determination of caffeine content in the sample, the author used a dry method to determine the moisture content of the sample, and at the same time carried out the determination of the ash content of the sample. In addition, an experiment for content determination and extraction was also performed. The method is as follows: Determination of content: precision weighing sample About 10 grams of powder, set in a 500 ml beaker, add distilled water 400 ml, stirring at all times, heating and boiling for one hour, and then add about 3-5 g of freshly precipitated Fe(OH)3, warm immersed for half an hour, cooling the back