Table 2.

Effects of light sources on catechins, polyphenols and soluble sugar content of tea (mean ± SD)

Treatment	GC (mg/g)	EGC (mg/g)	C (mg/g)	EGCG (mg/g)	EC (mg/g)	ECG (mg/g)	Total tea catechins (mg/g)	Polyphenols (mg/g)	Soluble sugar (%)
Dark	5.43 ± 0.19bc	3.74 ± 0.07bcd	0.47 ± 0.001	1.57 ± 0.01bcd	0.57 ± 0.12bc	1.25 ± 0.02de	13.03 ± 0.36 cd	83.71 ± 3.42	4.41 ± 0.04c
Ultraviolet light	6.50 ± 0.69ab	4.34 ± 0.42ab	0.50 ± 0.02	1.99 ± 0.15ab	0.88 ± 0.06ab	1.60 ± 0.17ab	15.82 ± 1.55ab	87.73 ± 1.64	4.45 ± 0.25bc
Yellow light	7.45 ± 0.78a	3.51 ± 0.16 cd	0.47 ± 0.01	2.26 ± 0.20a	0.73 ± 0.06abc	1.77 ± 0.16a	16.18 ± 1.51a	87.18 ± 2.62	4.79 ± 0.15a
Blue light	6.97 ± 0.69ab	3.84 ± 0.37bc	0.51 ± 0.07	1.77 ± 0.06bcd	0.77 ± 0.07abc	1.59 ± 0.04ab	15.45 ± 1.38abc	88.92 ± 2.04	4.52 ± 0.20abc
Purple light	5.93 ± 0.56abc	3.42 ± 0.21cd	0.54 ± 0.04	1.62 ± 0.08bcd	0.67 ± 0.05abc	1.44 ± 0.10bcd	13.62 ± 1.23bcd	85.87 ± 2.22	4.64 ± 0.16abc
White light	5.48 ± 0.53bc	3.12 ± 0.09d	0.59 ± 0.06	1.37 ± 0.07d	0.55 ± 0.04c	1.20 ± 0.11e	12.31 ± 1.17d	84.72 ± 0.44	4.47 ± 0.26bc
Orange light	7.40 ± 0.71a	3.41 ± 0.21cd	0.52 ± 0.06	1.69 ± 0.11bcd	0.90 ± 0.03a	1.39 ± 0.13bcde	15.30 ± 1.19abc	84.21 ± 1.17	4.62 ± 0.09abc
Red light	5.49 ± 0.21bc	3.67 ± 0.23cd	0.52 ± 0.07	1.79 ± 0.05bc	0.47 ± 0.00c	1.53 ± 0.07bc	13.47 ± 0.11bcd	85.63 ± 4.78	4.80 ± 0.03a
Cyan light	5.50 ± 0.57bc	3.64 ± 0.35cd	0.53 ± 0.03	1.54 ± 0.04cd	0.50 ± 0.05c	1.38 ± 0.12bcde	13.09 ± 1.26 cd	84.62 ± 2.44	4.73 ± 0.10ab
Green light	4.67 ± 0.05c	4.72 ± 0.14a	0.53 ± 0.03	1.44 ± 0.03cd	0.49 ± 0.03c	1.34 ± 0.05cde	13.18 ± 0.09 cd	84.41 ± 3.62	4.52 ± 0.02abc
Significance	*	**	Ns	**	*	**	**	Ns	*

SD standard deviation

^*, ^** indicate p < 0.05, and 0.01, respectively; Ns means not significant; each value was the average of three different samples; mean values with the same lowercase letters in the same column indicate no significant difference at p = 0.01 or 0.05