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Surface Discoloration Analysis and Lignin Degradation Fragments Identification of UV-Irradiated Moso Bamboo (Phyllostachys pubescens Mazel)

Articles

Journal/Conference:

BIORESOURCES

Language:

English

Author:

Yu Haixia; Yang Liu; Fang Chongrong; Xu Manping

Experts:

Yu Wenji

Year:

2015

Volume:

10

Issue:

1

Pages:

1617-1626

Keywords:

Bamboo; UV irradiation; Lignin; Photolysis; Kubelka-Munk; GC-MS

Color changes caused by artificial UV radiation of Moso bamboo (Phyllostachys pubescens Mazel) were recorded as a function of exposure time to obtain the maximum absorption trend by the Kubelka-Munk (K-M) spectra. Lignin photolysis into smaller molecules was evaluated using spectrophotometry and gas chromatography-mass spectrometry (GC-MS) analysis. Results showed that the K-M absorption peak increased in the yellow and red regions (360 to 500 nm) when compared with the untreated sample, which was in accordance with the yellow-red shift by visual observation. The maximum absorption of the KM spectra from UVB phototreated bamboo was in the UV region. GC-MS analysis showed that benzene carbonyls, organic acid, and esters were the major types of photolysized molecules of bamboo lignin, which were derived from the C-C bonds adjacent to the alpha-carbonyl. UV irradiation (295 to 400 nm) resulted in the breakdown of carbonyl and unsaturated C-C groups conjugated to aromatic ring at the C-alpha., which partly contributed to the quick discoloration at the initial 100 h of UV irradiation.