纳米材料对普洱茶浸提特性的影响

Effects of Nano-materials on Pu-erh Tea Extraction Characteristic

研究了纳米材料对普洱茶浸提特性的影响规律。首先,对纳米材料的平均粒径及分布进行了表征;对比研究了加入纳米材料前后蒸馏水的阴阳离子组成与浓度、pH值和可溶解性固体总量(TDS)及不同水样的17 ONMR半高峰宽等物化性能;其次,在室温(25℃)考察了不同纳米材料添加量下,普洱茶茶汤中茶多酚含量、氨基酸含量和水浸出物含量随浸提时间的变化关系。实验结果表明:纳米材料平均粒径为95.5nm,阳离子组成主要为Ca2+。加入纳米材料后,蒸馏水的17 O-NMR半高峰宽由113Hz减小至53Hz。加入纳米材料后,茶多酚、氨基酸和水浸出物含量较未加入纳米材料显著提高,且浸出速率明显增加,快速达到动态平衡。

Effects of nano-materials on Pu-erh tea extraction characteristics were investigated. Firstly, the average particle size and distribution of nano-materials were characterized, meanwhile, the ions, pH values, total dissolved solids （TDS） and 170-NMR line-width of distilled water with and without adding nano-materials were also tested. Then, The relationship between the chemical constituents of Pu-erh tea and extraction time in different nano-materials dosages at the room temperature （25 ~C ） was analyzed. The experimental results showed that the nano-materials with the average particle size of 95.5 nm were mainly composed of calcium. The 170-NMR line-width of distilled water decreased from 113 Hz to 53 Hz after adding nano-materials. The content of tea polyphones, amino acids and water extracts in the tea infusion prepared by distilled water adding nano-materials dramatically increased compared to distilled water without nano-materials, which indicated a high extraction rate and swift dynamic balance.