六堡茶的理化分析研究

 研究六堡茶散茶和砖茶(2006年产)的主要功能化学成分的含量及其光谱学特性。采用高效液相色谱法、分光光度法及色差分析等方法，分析六堡茶的理化特性，六堡茶散茶和砖茶的主要化学功能成分分析中，游离氨基酸含量分别为（29.81±0.073）和（2.37±0.011）mg/g，未检测出茶氨酸；水溶性糖含量分别为：(38.45±1.03)和(47.55±1.19)mg/g；游离蛋白质含量为13.28±0.53)和(11.41±1.71)mg/g；没食子酸含量分别为：(4.24±0.063)和(2.37±0.011)mg/g；咖啡碱含量分别为：(28.30±0.10)和(29.28±0.059)mg/g；茶多酚含量分别为：(131.09±8.41)和(95.61±0.58)mg/g，儿茶素类单体分别有8和7种检出，并分析了其含量；水浸出物含量分别为：(335.68±9.22)和(305.22±7.76)mg/g。用L*a*b*表色系分析了六堡茶和普洱茶茶汤的色差。紫外可见吸收光谱分析表明六堡茶茶汤在205nm和272nm处近有特征吸收峰。得出结论：六堡茶的理化特性呈现典型的黑茶特征。

Studies on physical and chemical properties of Liubao tea

This research studied the main physical and chemical properties of casual tea and brick tea of Liubao tea (producing date:2006). HPLC, spectrophotometry and chromatic aberration were adopted to investigate physical and chemical properties of Liubao tea The main functional chemicals in Liubao casual tea and brick tea were analysed, The free amino acid contents were (29.81±0.073)and (2.37±0.011)mg/g. The theanine was not detected. The water-soluble saccharide contents were (38.45±1.03)and (47.55±1.19)mg/g. The free protein contents were (13.28±0.53) and (11.41±1.71)mg/g. The gallic acid contents were (4.24±0.063) and (2.37±0.011)mg/g. The caffeine contents were (28.30±0.10) and (29.28±0.059) mg/g. The tea polyphenols contents were (131.09±8.41) and (95.61±0.58) mg/g, and then the numbers of catechin compositions detected were 8 and 7, and their contents were determined.The water extracts were (335.68±9.22) and (305.22±7.76)mg/g. chromatic aberration of tea liquor were analyzed by L*a*b* table color system. UV-Vis spectra showed that there were absorption peak at about 205 and 272 nm. Liubao tea has typical characteristics of Heicha.