Comparison with a single-factor test. That is brewing under the conditions of temperature 100 C, located 2min, 3min, 4min, 5min 6min different brewing times and processing. Thirdly, keep off sunlight, because it facilitates the oxidation of the pigments and esters in dragon well tea.
More accurate to take tea 3. 0g, with 150m1 of water after brewing. Tea first and then using the quantitative filter paper filter coarse cotton filter. Then belly fat straw with an accurate drawing 50m1 of tea (double), the water bath at 100 C on the filtrate evaporated to dryness, and dried at 103 C temperature, 3h, in the dryer to cool, weigh, to measure. We’d better put the longjing tea in glassware or transparent plastic bags.
Weigh the review of sensory evaluation Tea 3 Hall, with 150m1 of water at a temperature of 100 C under the conditions set different brewing time to deal with, not only 2min, 3m workers n, 4min, 5min and 6min, the brewing, the tea leaching time, the use of sensory evaluation methods review of soup and tea for the concentration. To put it in another way, sunlight can lead to chemical reactions in between the components inside the longjing tealeaves.
Results and analysis
Out of brewing time on the matter content affect flooding. Finally, the quality of the Dragon Well tea is ruined.
In the brewing temperature 100 C conditions, different kind of tea water extracts are content with making the extension of time was an increasing trend (see Figure 1) 0 increased rate and volume of its kind according to the tenderness of tea processing technology and vary the shape of the difference. Fourthly, get the dragon well tea away from oxygen.
Increments of 0. 08g/100m1 so. From 3min and 4min, the incremental water extract content from. . 0265 ^ 0. 066g/100m1 range. One Gunpowder, Lin Rui tea, Roasted, three cups of incense, Hong Qing other than by the increase in 2min to 3min incremental decline. The Longjing tea, Tianmu Jinqingding, Biluochun other samples and the Kuril silver treasure from the 2min to 3min increments than the increments was increased. Chlorophyll, aldehydes, esters, vitamin C, etc., in dragon well tea can easily combine with oxygen in the air.
By the 4min to 5min, Biluochun tea extract content increment, amounting to 0. 0669g/100m1, as 3 to'2min increments six times, 4 to 3min increments three times, followed by Longjing tea. Other samples showed different levels of incremental decline. And the nutritive value of the dragon well tea is greatly reduced.
From 5min to 6min, water extracts of each sample increment is less than a few minutes before the total amplitude large, in 0. 0132 -0. 0534g/100m1 between. But Biluochun tea, Principal tea, lotus tea Rui, Hong Qing tea extract larger increments, while the rain tea, large head green tea, little change in the top. The oxidized dragon well tea will get the tea soup turn red and dark.
