Cleavage of 14C-labeled glycine and its polycondensation with pyrogallol as catalyzed by birnessite

Wang, M.C.; Huang, P. M.

doi:10.1016/j.geoderma.2004.06.006

Cited by 22 publications

(7 citation statements)

References 17 publications

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“…As shown in Table 2, the C/N atomic ratios for the presence of control and allophanic soil were 21.78 and 14.32, respectively. This is due to the degradation of CT and Gly through cleavage and to the subsequent decarboxylation of CO 2 released by the catalytic power of allophanic soil [2][3][4][5]. This evidently resulted in a dramatic decrease of the C/N atomic ratio in the presence of allophanic soil.…”

Section: Discussionmentioning

confidence: 99%

Effect of an allophanic soil on humification reactions between catechol and glycine: Spectroscopic investigations of reaction products

Fukushima

Miura

Sasaki

et al. 2009

Journal of Molecular Structure

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Section: Discussionmentioning

confidence: 99%

Effect of an allophanic soil on humification reactions between catechol and glycine: Spectroscopic investigations of reaction products

Fukushima

Miura

Sasaki

et al. 2009

Journal of Molecular Structure

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“…Biological catalysts include polyphenol oxidase, peroxidase, and laccase enzymes produced by fungi, which mediate the electron transfer from the polyphenol to molecular oxygen (Sjoblad andBollag 1981, Tate 1992). Other substances in soils either catalyze the reaction -e.g., amorphous silica, charcoal, iron-sorbed smectite (Amonette et al 2003a(Amonette et al , b, 2004Booth et al 2004) -or serve as oxidants -e.g., oxides and hydroxides of manganese and iron, smectites (Amonette et al 2000;Naidja et al 1998;Shindo and Huang 1984;Wang and Huang 2005). Recent evidence suggests the overall reaction rate increases synergistically when both biological and inorganic catalysts are present (Amonette et al 2000(Amonette et al , 2003a.…”

Section: Condensation/polymerizationmentioning

confidence: 99%

Mechanisms controlling soil carbon turnover and their potential application for enhancing carbon sequestration

2006

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In addition to increasing plant C inputs, strategies for enhancing soil C sequestration include reducing C turnover and increasing its residence time in soils. Two major mechanisms, (bio)chemical alteration and physicochemical protection, stabilize soil organic C (SOC) and thereby control its turnover. With (bio)chemical alteration, SOC is transformed by biotic and abiotic processes to chemical forms that are more resistant to decomposition and, in some cases, more easily retained by sorption to soil solids. With physicochemical protection, biochemical attack of SOC is inhibited by organomineral interactions at molecular to millimeter scales. Stabilization of otherwise decomposable SOC can occur via sorption to mineral and organic soil surfaces, occlusion within aggregates, and deposition in pores or other locations inaccessible to decomposers and extracellular enzymes. Soil structure is a master integrating variable that both controls and indicates the SOC stabilization status of a soil. One potential option for reducing SOC turnover and enhancing sequestration, is to modify the soil physicochemical environment to favor the activities of fungi. Specific practices that could accomplish this include manipulating the quality of plant C inputs, planting perennial species, minimizing tillage and other disturbances, maintaining a near-neutral soil pH and adequate amounts of exchangeable base cations (particularly calcium), ensuring adequate drainage, and minimizing erosion. In some soils, amendment with micro-and mesoporous sorbents that have a high specific surface -such as fly ash or charcoal -can be beneficial.

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“…Inorganic mineral materials including metallic oxides, which often coexist with organic waste, can be used as Lewis acids, making small organic molecules form humus macromolecules by catalytic oxidation [2] and accepting electrons from humic precursors [3,4]. Polycondensation of small organic molecules enhanced by metallic oxides such as Si, Al, Fe and Mn oxides has been well documented [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Role of ferric oxide in abiotic humification enhancement of organic matter

Zhang

Yue

Lu³

et al. 2015

J Mater Cycles Waste Manag

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The significance of humification pathway as promoted by metallic oxides has previously been well investigated using a model system containing humus precursors. Metallic oxides, co-existing with organic matter in nature, are capable of promoting humification of organic matter to different degrees. This study is an investigation into the role of ferric oxide in the process of humification, based on the degree of darkening for humus precursors. Glucose (Glu), glycine (Gly) and catechol (Cat) were introduced as humification model precursors, and the role of ferric oxide in different periods of humification was discussed by characterizing humification degree in terms of dissolved organic carbon, ratio of Fulvic acids (FA) to Humic acids (HA), and E 600 . Valence changes of Fe were analyzed using X-ray photoelectron spectroscopy. The results showed that ferric oxide was effective on the conversion from FA to HA, and the effectiveness grew as the ferric oxide concentration increased. A higher pH value was more conducive to form dark substances. Amounts of Fe with various valences changed remarkably after humification, suggesting that ferric oxide was involved in the humification reaction.

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Cleavage of 14C-labeled glycine and its polycondensation with pyrogallol as catalyzed by birnessite

Cited by 22 publications

References 17 publications

Effect of an allophanic soil on humification reactions between catechol and glycine: Spectroscopic investigations of reaction products

Effect of an allophanic soil on humification reactions between catechol and glycine: Spectroscopic investigations of reaction products

Mechanisms controlling soil carbon turnover and their potential application for enhancing carbon sequestration

Role of ferric oxide in abiotic humification enhancement of organic matter

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