Discoloration and Degradation of Bamboo under Ultraviolet Radiation

Table 1

The main degraded products identified by GC-MS from UV-aged Moso bamboo.

No.	CAS	Molecular formula	English name	Group area	Structural formula
1	123-08-0	C7H6O2	p-Hydroxybenzaldehyde	4,922,530.60
2	621-59-0	C8H8O3	Isovanillin	6,593,258.99
3	99-93-4	C8H8O2	4-Hydroxyacetophenone	1,547,854.13
4	498-02-2	C9H10O3	4-Hydroxy-3-methoxyacetophenone	2,313,156.21
5	645-08-9	C8H8O4	3-Hydroxy-4-methoxybenzoic acid	3,395,412.37
6	98-29-3	C10H14O2	4-tert-Butylcatechol	2,177,054.12
7	1132-21-4	C9H10O4	3,5-Dimethoxybenzoic acid	1,371,235.46
8	134-96-3	C9H10O4	Syringaldehyde	6,275,856.42
9	2478-38-8	C10H12O4	Acetosyringone	2,351,205.43
10	530-57-4	C9H10O5	Syringic acid	3,341,287.46
11	2196-18-1	C10H12O4	β-Hydroxypropiovanillone	6,170,213.55
12	39151-19-4	C10H12O3	3,5-Dimethoxyacetophenone	144,588.51