Photo- and radiation chemical induced degradation of lignin model compounds

Lanzalunga, Osvaldo; Bietti, Massimo

doi:10.1016/s1011-1344(00)00054-3

Cited by 161 publications

(115 citation statements)

References 112 publications

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“…In general, lignin has a high resistance to microbial enzymes, but it is sensitive to different wavelengths of ultraviolet radiation (Rozema et al 1997). It seemed possible that lignin decomposed into watersoluble species without relevant gas emission (Gould 1982;Lanzalunga and Bietti 2000;Henry et al 2008). During UV-A exposure, straw lignocellulosic components decreased to different extents (Fig.…”

Section: Straw Chemical Compositionmentioning

confidence: 99%

The Effects of UV-A on Dry Rice Straw Decomposition under Controlled Laboratory Conditions

Li¹,

Huang²,

Wu³

et al. 2016

BioResources

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In arid and semi-arid areas, organic matter decomposition is stimulated by ultraviolet radiation. In this paper, the association between straw decomposition and UV-A exposure was evaluated. Oven-dried rice straw samples were chronically exposed to UV-A radiation and examined periodically for up to 90 days at room temperature. Scanning electron microscopy (SEM) showed that noticeable disintegration of the fiber structure occurred on the irradiated sample surface in comparison to the control. At the end of the UV-A treatment period, straw mass had decreased by 5%, and dissolved organic carbon (DOC) increased by 18%. The content of cellulose, hemicellulose, and lignin of the irradiated straw decreased by 29.3%, 14.4% and 49.3%, respectively. The marked loss of nitrogen and potassium in the exposed straw were also observed. Thermogravimetric analysis (TGA) showed that treatment with UV-A radiation tended to decrease the mass loss rate and the thermal degradation temperature of the straw biomass from 220 °C to 208 °C. Infrared spectrometric analysis (ATR-FTIR) showed that functional groups, e.g., C-OH and C-O-C, were disrupted obviously due to UV-A exposure. These results suggest that ultraviolet-A irradiation facilitates straw decomposition by direct photochemical degradation.

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Section: Straw Chemical Compositionmentioning

confidence: 99%

The Effects of UV-A on Dry Rice Straw Decomposition under Controlled Laboratory Conditions

Li¹,

Huang²,

Wu³

et al. 2016

BioResources

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“…The derivatives of the syringyl components (e.g., syringic acid, syringyl aldehyde) are considered as tracers for hardwood burning (Simoneit et al, 2002(Simoneit et al, , 1993. Albeit relative amounts of various phenolic compounds can be used as tracers for the type of biomass burned, the long-range stability of the individual pyrolysis products in the atmosphere is questionable (Simoneit, 2002;Lanzalunga and Bietti, 2000;Kjällstrand et al, 2001a).…”

mentioning

confidence: 99%

Diel and seasonal variations in the chemical composition of biomass burning aerosol

Hoffer

Gelencsér²,

Blazsó

et al. 2006

Atmos. Chem. Phys.

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Abstract. Fine aerosol particles were collected separately during daytime and nighttime at a tropical pasture site in Rondônia, Brazil, during the burning and dry-to-wet transition period in 2002. Total carbon (TC) and water-soluble organic carbon (WSOC) were measured by evolved gas analysis (EGA). Based on the thermochemical properties of the fine aerosol, the relative amounts of the volatile and refractory compounds were estimated. It was found that the thermally refractory (possibly higher molecular weight) compounds dominated the TC composition. Their contribution to TC was higher in the daytime than in the nighttime samples. The relative share of WSOC also showed a statistically significant diel variation as did its refractory fraction. Anhydrosugars and phenolic acids were determined by GC-MS and their diel variation was studied. Based on the decrease of their relative concentrations between the biomass burning and transition periods and their distinctly different diel variations, we suggest that the phenolic acids may undergo chemical transformations in the aerosol phase, possibly towards more refractory compounds (humic-like substances, HULIS), as has been suggested previously. These conclusions are supported by the results of the thermally assisted hydrolysis and methylation gas chromatography-mass spectrometry of the same filter samples.

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“…In general, lignin is considered to be resistant to environmental microorganisms during biodegradation, but it is susceptible to ultraviolet (UV) radiation with diverse wavelengths. Much early research suggests that many functional groups in lignin, e.g., carboxide, phenylbenzene, aldehyde group, and conjugated double bonds are capable of absorbing ultraviolet radiation and reacting with active oxygen as the main promoter of photodegradation (Lanzalunga and Bietti 2000;Austin and Ballaré 2010;Rosu et al 2010). In addition, a free radical mechanism of photo-induced oxidation of lignocellulosic materials was shown to involve a chain reaction in the liquid phase (Malešič et al 2005).…”

Section: Introductionmentioning

confidence: 99%

“…However, few researchers have examined the degradation behavior of lignocellulosic material under different levels of relative air humidity (RH). Additionally, the action mechanism of biodegradation and photodegradation of biomass materials in moist conditions with UV supplementation has not been fully understood (Rozema et al 1997;Lanzalunga and Bietti 2000).…”

Section: Introductionmentioning

confidence: 99%

Straw Degradation Behaviors under Different Conditions of Relative Air Humidity and Ultraviolet-A Irradiation

Huang

et al. 2016

BioResources

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In this study, straw was degraded continuously for 150 days under one of three levels of relative air humidity (RH) (90%, 60%, or 30%) to estimate the effect of humidity on straw biodegradation. Moreover, straw was treated with ultraviolet (UV)-A irradiation + 90% RH for 180 days to evaluate the interaction between photodegradation and biodegradation. The effects of 30% and 60% RH on straw degradation was inconspicuous. Straw mass losses at 90% RH and UV-A + 90% RH were 18.5% and 39.1%, respectively. BIOLOG analysis showed that filamentous fungi played a major role in straw biodegradation. Thermogravimetric analysis showed that treatment with UV-A + 90% RH tended to increase the maximum pyrolysis rate and decreased the initial pyrolysis temperature. Compared with 90% RH, infrared spectra analysis showed that functional groups of UV-A + 90% RH treatment, e.g., -CH, -C=O, and the benzene ring structure, clearly decreased. Strawdegrading bacteria were observed by scanning electron microscopy at the beginning and end of UV-A + 90% RH treatment. Results highlight the role of humidity in the degree of straw biodegradation by filamentous fungi. Straw degradation is accelerated by the combined action of photodegradation and biodegradation under high UV-A irradiation and high humidity.

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Photo- and radiation chemical induced degradation of lignin model compounds

Cited by 161 publications

References 112 publications

The Effects of UV-A on Dry Rice Straw Decomposition under Controlled Laboratory Conditions

The Effects of UV-A on Dry Rice Straw Decomposition under Controlled Laboratory Conditions

Diel and seasonal variations in the chemical composition of biomass burning aerosol

Straw Degradation Behaviors under Different Conditions of Relative Air Humidity and Ultraviolet-A Irradiation

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