Extraction Efficiency of Different Solvents and LC-UV Determination of Biogenic Amines in Tea Leaves and Infusions

Table 1

Main characteristics of tea samples.

Sample	Kind of tea	Origin	Cultivation	Caffeine content (w/w%)
1	Black	Kenia	Conventional	1.5
2	Black	China	Conventional	1.7
3	Black	China	Conventional	1.5
4	Black	Tanzania	Conventional	1.6
5	Black	Tanzania	Conventional	1.5
6	Black	China	Conventional	1.8
7	Black	India	Conventional	1.6
8	Black	Sri Lanka	Organic	1.9
9	Black	Kenia	Conventional	≤0.1%
10	Black	India	Conventional	≤0.1%
11	Black	India	Conventional	≤0.1%
12	Black	China	Conventional	≤0.1%
13	Black	China	Conventional	≤0.1%
14	Black	Kenia	Organic	1.7
15	Green	China	Conventional	2.0
16	Green	Tanzania	Conventional	≤0.1%
17	Green	India	Conventional	1.8
18	Green	Sri Lanka	Conventional	≤0.1%
19	Green	Sri Lanka	Conventional	2.0
20	Green	India	Organic	1.6
21	Green	Kenia	Organic	1.7