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17O-NMR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,普洱荼茶汤中茶多酚含量、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95.5 nm,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113 Hz减小至53 Hz.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.
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