梵净山白茶营养成分分析与评价

【目的】分析梵净山白茶营养成分并评价其营养价值,为梵净山白茶开发利用提供参考依据。【方法】根据国家检测标准测定梵净山白茶的一般营养成分、氨基酸和游离氨基酸含量、矿物质元素及重金属含量,与相关文献报道的其他茶类进行对比分析,并应用氨基酸评分法进行营养价值评价。【结果】梵净山白茶富含人体所需的营养物质,其中,维生素C(Vc)含量为19.32±0.01 mg/100 g,蛋白质含量为27.82±0.07 g/100 g,氨基酸总量为25.322 g/100 g,必需氨基酸总量为10.446 g/100 g,游离氨基酸总量为2.179 g/100 g;重金属含量符合食品安全国家标准;第一限制性氨基酸为甲硫氨酸+半胱氨酸,第二限制性氨基酸为苏氨酸。【结论】梵净山白茶含有人体所需的维生素、蛋白质、多种氨基酸及微量元素等,可作为优质营养保健茶开发利用。

Analysis and evaluation on nutritional components of white tea from Fanjing mountain

Objective]The nutritive composition and nutritional value of white tea from Fanjing mountain were ana-lyzed and evaluated, in order to provide reference for development and utilization of white tea from Fanjing mountain.Method]According to the related national standards, some of common nutritional components in white tea from Fanjing mountain, including amino acid content, free amino acid(FAA) content, mineral element content, heavy metal element content were determined to analyze its superiority, compared with relevant literature, and the nutritional value was esti-mated based on amino acid score. Result]White tea from Fanjing mountain was rich in essential nutrient. Moreover , the contents of vitamin C, protein, total amino acid, essential amino acids(EAA), FAA were 19.32±0.01 mg/100 g, 27.82± 0.07 g/100 g, 25.322 g/100 g, 10.446 g/100 g, 2.179 g/100 g, respectively. Furthermore, contents of heavy metal ele-ments met national food safety standards. Methionine and cysteine were the first limiting amino acids , threonine was the second limiting amino acids. Conclusion]The white tea from Fanjing mountain contains rich nutrients which are essential to human body, such as vitamins, proteins, amino acids, trace elements, etc.. Therefore, the white tea from Fanjing mountain should be developed and utilized as high-quality nutritional health tea.