梵净山黑茶营养成分分析

Analysis of Nutritional Components of Fanjingshan Dark Tea

该研究以梵净山黑茶为研究对象,对梵净山黑茶基本营养成分、氨基酸、矿物质、重金属等进行测定,并对其营养价值进行评价。结果表明:梵净山黑茶蛋白质、灰分、粗纤维、总糖、还原糖和维生素C含量分别为11.17、4.18、18.91、7.59、2.96 g/100 g和40.49 mg/100 g。梵净山黑茶有17种氨基酸,氨基酸总量为14.875 g/100 g,必需氨基酸与氨基酸总量的比值为48.50%,必需氨基酸与非必需氨基酸的比值为94.19%,符合联合国粮农组织/世界卫生组织(Food and Agriculture Organization of the United Nations/World Health Organization,FAO/WHO)的理想模式;梵净山黑茶中含药效氨基酸9种,占氨基酸总量的64.34%。经氨基酸评分(amino acid score,AAS)和化学评分(chemical score,CS),梵净山黑茶第一限制性氨基酸为蛋氨酸、半胱氨酸,必需氨基酸指数为105.114;游离氨基酸的总量为0.561 g/100 g,精氨酸含量最高达0.381 g/100 g;梵净山黑茶矿物元素丰富,其中微量元素硒含量高达4.61 mg/kg;汞、铅、镉、砷均符合国家卫生限量标准。综上可知,梵净山黑茶营养成分丰富,药效氨基酸含量丰富,是一种优质蛋白来源且富硒的茶叶资源。

In this study,the basic nutritional components,amino acids,minerals and heavy metals of Fanjingshan dark tea were determined and its nutritional value was evaluated.The results showed that the protein,ash,crude fiber,total sugar,reducing sugar and vitamin C of Fanjingshan dark tea were 11.17,4.18,18.91,7.59,2.96 g/100 g and 40.49 mg/100 g,respectively.There were 17 kinds of amino acids in Fanjingshan dark tea,the total amount of amino acids was 14.875 g/100 g,the ratio of essential amino acids to total amino acids(EAA/TAA)was 48.50%,the ratio of essential amino acids to nonessential amino acids(EAA/NEAA)was 94.19%,which conformed to the ideal mode of Food and Agriculture Organization of the United Nations/World Health Organization(FAO/WHO).There were 9 kinds of effective amino acids in Fanjingshan dark tea,accounted for 64.34%.According to the amino acid score(AAS)and chemical score(CS),the first limiting amino acid of Fanjingshan dark tea was methionine and cysteine,and the index of essential amino acid was 105.114;the total amount of free amino acid was 0.561 g/100 g,and the arginine content was the highest,which was 0.381 g/100 g;the mineral elements of Fanjingshan dark tea were rich,in which the content of trace element selenium was up to 4.61 mg/kg;mercury,lead,cadmium and arsenic were all consistent meet the national health limit standard.In conclusion,Fanjingshan dark tea was rich in nutrients and amino acids.It was a high-quality protein source and selenium rich tea resource.