为评价不同采集时间及制作方式对同一地点洞庭碧螺春茶活性成分的影响,采用国标法及常用实验方法对常规活性成分、矿质元素及氨基酸进行测定和分析评价.结果表明:在水分含量上,明前茶与明后茶相差不大;可溶性蛋白含量明前茶显著高于明后茶,而在鲜叶与炒制茶之间差异不显著;灰分含量最高的是明后鲜叶,最低的是明前炒制茶.维生素C、有机酸和灰分含量,鲜叶显著高于炒制茶,其中明后鲜叶含量最高.四种碧螺春茶中粗脂肪含量差异显著,炒制茶显著高于鲜叶,其中明后炒制茶含量最高.六种矿质元素在明后茶中的含量显著高于明前茶,同时在鲜叶中的含量也要高于相应的炒制茶中.氨基酸测定结果表明,明前茶的总氨基酸含量及风味氨基酸含量显著高于明后茶,鲜叶与相应炒制茶之间的总氨基酸及风味氨基酸含量差异不大.

To analysis and evaluate nutrient quality of abandoned branches and leaves of Biluochun (ABLB), using the na-tional standard methods and some other methods, total anthocyanin contents, total polyphenols, total flavonoids, mineral ele-ments and some other nutritional components were determined. And total antioxidant capacity (T－AOC) of ABLB was investigat-ed. The results indicated that there are many kinds of nutrients in ABLB. And contents of anthocyanin , polyphenol and flavnoid were 0.77 mg cyanidin 3－galactoside／g(DW), 165.22 mg gillic acid／g(DW) and 52.62 mg rutin／g(DW), respectively. The contents of moisture,ash,crude fat,crude fiber,total soluble protein and total soluble sugar in ABLB were 76.77%,4.80%, 3.66%,0.16%,2.99% and 3.86%. The ABLB had 18 kinds of amino acids, total amino acid and essential amino acid were 55.8 mg／g and 20.53 mg／g, respectively. The amino acids of Thr, Val, Leu, Phe+Tyr and Lys were higher than that in the pattern of FAO／WHO and Leu, Lys were higher than the pattern of egg. The extract of ABLB had good antioxidant activity and the content of ABLB was positively correlated with antioxidant capacity. So, the ABLB appear to have a good prospect of exploitation and application. And it is worth our in－depth development and utilization.