【摘要】 研究了提高落叶松树皮单宁抽出率的方法。实验结果表明:用氢氧化钠和乙醇作添加剂浸提落叶松树皮可获得大量提取物,单宁的数量和浸提液的质量也有明显的提高。通过正交实验得出落叶松树皮单宁的最佳浸提条件为占绝干树皮1.5％的氢氧化钠和35％的乙醇水溶液,温度90℃,时间5h。提取物和单宁抽出率比水浸提分别提高了11.4％和12.7％,浸提液的纯度提高了11.48％。更多还原

【Abstract】 Extraction methods of Larch bark for better tannin recovery are studied. A lot of Tannin has been achieved by extracting with certain additives. The experimental results Showed that extraction with chemical additives, such as sodium hydroxde, ethanol, removed a great amount of extractives from larch bark than did with water. The quantity and quality of tannin extract also greatly improved. The optimal conditions of the extraction were determined by crossed test. The most suitable conditions for recovery tannin extract from larch bark are 1.25 percent of sodium hydroxide based on dry weight of bark and 35 percent ethanol—water solution, temperature 90℃, 5 hours. The extraction rate of extractives and tannin have increased by 11.4 percent and 12.7 percent respectively as compared with water. The purity of tannin extract has increased by 11.48 percent.更多还原