Antioxidative Capacity of the Degradation Products of Glucuronic and Galacturonic Acid from Subcritical Water Treatment

Subcritical water treatment has received considerable attention due to its cost effectiveness and environmentally friendly properties. In this investigation, Chinese quince fruits were submitted to subcritical water treatment (130, 150, and 170 °C), and the influence of treatments on the structure of milled wood lignin (MWL) was evaluated. Structural properties of these lignin samples (UL, L130, L150, and L170) were investigated by high-performance anion exchange chromatography (HPAEC), FT-IR, gel permeation chromatography (GPC), TGA, pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), 2D-Heteronculear Single Quantum Coherence (HSQC) -NMR, and 31P-NMR. The carbohydrate analysis showed that xylose in the samples increased significantly with higher temperature, and according to molecular weight and thermal analysis, the MWLs of the pretreated residues have higher thermal stability with increased molecular weight. The spectra of 2D-NMR and 31P-NMR demonstrated that the chemical linkages in the MWLs were mainly β-O-4′ ether bonds, β-5′ and β-β′, and the units were principally G- S- H- type with small amounts of ferulic acids; these results are consistent with the results of Py-GC/MS analysis. It is believed that understanding the structural changes in MWL caused by subcritical water treatment will contribute to understanding the mechanism of subcritical water extraction, which in turn will provide a theoretical basis for developing the technology of subcritical water extraction.

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Antioxidant Characteristics of Extracts from Cereal Residues by Their Subcritical Water Treatment

Journal of Oleo Science ◽

10.5650/jos.61.465 ◽

2012 ◽

Vol 61 (9) ◽

pp. 465-468 ◽

Cited By ~ 1

Author(s):

Yusuke Murayama ◽

Jintana Wiboonsirikul ◽

Pramote Khuwijitjaru ◽

Takashi Kobayashi ◽

Shuji Adachi

Keyword(s):

Water Treatment ◽

Subcritical Water ◽

Antioxidant Characteristics ◽

Cereal Residues

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Hydrolysis of bamboo biomass by subcritical water treatment

Bioresource Technology ◽

10.1016/j.biortech.2015.05.010 ◽

2015 ◽

Vol 191 ◽

pp. 244-252 ◽

Cited By ~ 55

Author(s):

Mood Mohan ◽

Tamal Banerjee ◽

Vaibhav V. Goud

Keyword(s):

Water Treatment ◽

Subcritical Water ◽

Hydrolysis Of

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Utilization of Plant-Based Agricultural Waste by Subcritical Water Treatment

Japan Journal of Food Engineering ◽

10.11301/jsfe.17.33 ◽

2016 ◽

Vol 17 (2) ◽

pp. 33-39 ◽

Cited By ~ 10

Author(s):

Pramote KHUWIJITJARU

Keyword(s):

Water Treatment ◽

Subcritical Water ◽

Agricultural Waste

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d-Galacturonic Acid: A Highly Reactive Compound in Nonenzymatic Browning. 2. Formation of Amino-Specific Degradation Products

Journal of Agricultural and Food Chemistry ◽

10.1021/acs.jafc.5b01121 ◽

2015 ◽

Vol 63 (28) ◽

pp. 6457-6465 ◽

Cited By ~ 10

Author(s):

Steffen Wegener ◽

Maria-Anna Bornik ◽

Lothar W. Kroh

Keyword(s):

Galacturonic Acid ◽

Degradation Products ◽

Nonenzymatic Browning ◽

Reactive Compound ◽

Specific Degradation

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Perfluorooctane sulphonate and perfluorooctanoic acid in drinking and environmental waters

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2009.0109 ◽

2009 ◽

Vol 367 (1904) ◽

pp. 4119-4136 ◽

Cited By ~ 70

Author(s):

Paul C. Rumsby ◽

Clare L. McLaughlin ◽

Tom Hall

Keyword(s):

Drinking Water ◽

Activated Carbon ◽

Water Treatment ◽

Degradation Products ◽

Drinking Water Treatment ◽

Perfluorooctanoic Acid ◽

Consumer Products ◽

Environmental Waters ◽

Perfluorinated Chemicals ◽

Low Levels

Perfluorooctane sulphonate (PFOS) and perfluorooctanoic acid (PFOA) are chemicals that have been used for many years as surfactants in a variety of industrial and consumer products. Owing to their persistent, bioaccumulative and toxic (PBT) characteristics, PFOS has been phased out by its principal producer and the use of PFOA has been reduced. This PBT potential and a number of pollution incidents have led in recent years to an increase in studies surveying the concentrations of PFOS and PFOA in environmental waters worldwide. This paper reviews the results of these studies, as well as the monitoring that was conducted after the pollution incidents. The results of surveys suggest that PFOS and PFOA are found in environmental waters worldwide at low levels. In general, these levels are below health-based values set by international authoritative bodies for drinking water. There have been limited measurements of these chemicals in drinking water, but again these are below health-based values, except in some cases following pollution incidents. Monitoring studies suggested that where PFOS and PFOA were detected, they were at similar levels in both source and drinking water, suggesting that drinking water treatment does not remove these chemicals. However, new data show that PFOS and PFOA are effectively removed by granular activated carbon absorbers in practice. Further research is required on the newer perfluorinated chemicals that appear to be safer, but their degradation products have not as yet been fully studied.

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