Study on Polyphenol Oxidase Activity and Total Phenol Content of Docynia indica

[Objectives] To study the polyphenol oxidase (PPO) activity and total phenol content of Docynia indica .[Methods] The tender branches and petioles of the medicinal and edible plant D. indica were used as experimental materials, and the annual changes of total phenol content and polyphenol oxidase (PPO) activity were analyzed.[Results] pH 7.0 was the optimum value of polyphenol oxidase activity in D. indica plants;the best substrate was catechol with the concentration of 0.15 mol/L;the optimum temperature was 25 ℃.[Conclusions] The total phenol content of D. indica plants was the lowest in April, May and September of each year. The polyphenol oxidase activity of D. indica plants at flowering and fruiting stage was significantly higher than that at pre-flowering stage.

冠突散囊菌固态发酵对栘(木衣)茶品质和成分影响的研究

通过人工接种冠突散囊菌固态发酵栘(木衣)茶,探究栘(木衣)茶发酵前后感官品质和化学成分的变化。栘(木衣)茶经冠突散囊菌发酵7 d,通过感官评价可知发酵后茶汤滋味醇厚回甘,颜色橙黄明亮,具有独特的"菌花香",并通过电子舌进一步证明栘(木衣)茶发酵前后感官品质存在差异。采用全自动氨基酸分析仪对主要氨基酸进行分析,结果发酵后氨基酸总量下降,但是呈味氨基酸和人体必需氨基酸质量分数升高。采用高效液相色谱仪对发酵前后化学成分的组成与主要指标成分进行含量分析,结果 HPLC指纹图谱比较显示其化学成分组成与含量均发生了明显的变化,其中主要化学成分根皮苷质量分数由251.87 mg/g下降为198.25 mg/g,根皮素作为根皮苷的降解产物,其质量分数由2.4943 mg/g升高到19.619 mg/g。因此,通过发酵栘茶,可以改善其感官品质和化学成分,具有较大的开发与应用价值。

云南丽江栘果成分分析

本文对云南丽江木多木衣果内宏量营养成份、常量及微量营养元素和氨基酸组成进行了较为全面的分析 ,木多木衣果中粗蛋白含量及钙、磷、钾、脯氨酸、天冬氨酸的含量比一般水果中的含量要高。