TY - GEN
T1 - Antioxidant activity of peat humic acids
AU - Chukhareva, N. V.
AU - Voronova, O. A.
PY - 2017
Y1 - 2017
N2 - The article presents the study on the effect of thermal and acidic hydrolysis treatment on the antioxidant activity of humic acids. It clarifies the changes in macromolecule structure resulted from the variations in periphery/nucleus ratio. Using the differential-thermal analysis, kinetic parameters of humic acid thermal-oxidative destruction were determined. The studied samples of humic acids were divided into three groups: humic acids extracted from air-dried fen and terrestrial fuscum peat, humic acids subjected to the two-stage hydrolysis with 10% solutions of HCl and HF, humic acids thermally treated in decomposing gases of fen and terrestrial fuscum peat and subjected to the two-stage acidic hydrolysis. The relationship between DSC, DTG, TG curves characteristic parameters and peculiarities resulted from the treatment of humic acid macromolecule was established. The kinetic parameters of thermal-oxidative destruction within two temperature regions were defined: low-temperature region 150-380 °С and high-temperature region 380-700 °С. Z coefficient that allowed defining the number of low-molecular fractions in humic acid macromolecule was calculated. It was proved that treatment of humic acid increases its antioxidant activity.
AB - The article presents the study on the effect of thermal and acidic hydrolysis treatment on the antioxidant activity of humic acids. It clarifies the changes in macromolecule structure resulted from the variations in periphery/nucleus ratio. Using the differential-thermal analysis, kinetic parameters of humic acid thermal-oxidative destruction were determined. The studied samples of humic acids were divided into three groups: humic acids extracted from air-dried fen and terrestrial fuscum peat, humic acids subjected to the two-stage hydrolysis with 10% solutions of HCl and HF, humic acids thermally treated in decomposing gases of fen and terrestrial fuscum peat and subjected to the two-stage acidic hydrolysis. The relationship between DSC, DTG, TG curves characteristic parameters and peculiarities resulted from the treatment of humic acid macromolecule was established. The kinetic parameters of thermal-oxidative destruction within two temperature regions were defined: low-temperature region 150-380 °С and high-temperature region 380-700 °С. Z coefficient that allowed defining the number of low-molecular fractions in humic acid macromolecule was calculated. It was proved that treatment of humic acid increases its antioxidant activity.
KW - Antioxidant activity
KW - Humic acids
KW - Macromolecule
KW - Thermal-oxidative destruction
KW - Treatment
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U2 - 10.5593/sgem2017/32/S13.003
DO - 10.5593/sgem2017/32/S13.003
M3 - Conference contribution
AN - SCOPUS:85032392376
SN - 9786197408263
T3 - International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM
SP - 19
EP - 26
BT - Education and Accreditation in Geosciences; Environmental Legislation, Multilateral Relations And Funding Opportunities
PB - International Multidisciplinary Scientific Geoconference
T2 - 17th International Multidisciplinary Scientific Geoconference, SGEM 2017
Y2 - 29 June 2017 through 5 July 2017
ER -