Physicochemical Characterization and Antioxidant Activity of Humic Acids Isolated from Peat of Various Origins; Molecules; Vol. 23, iss. 4

Physicochemical Characterization and Antioxidant Activity of Humic Acids Isolated from Peat of Various Origins; Molecules; Vol. 23, iss. 4

Detalhes bibliográficos
Parent link:Molecules
Vol. 23, iss. 4.— 2018.— [753, 15 p.]
Autor Corporativo: Национальный исследовательский Томский политехнический университет Исследовательская школа химических и биомедицинских технологий (ИШХБМТ)
Outros Autores: Zykova M. V. Maria, Schepetkin (Shchepyotkin) I. A. Igor Aleksandrovich, Belousov M. V. Mikhail Valerievich, Krivoshchekov S. V. Sergey Vladimirovich, Logvinova L. A. Lyudmila, Bratishko K. A. Kristina, Yusubov M. S. Mekhman Suleiman-Ogly (Suleimanovich), Romanenko S. V. Sergey Vladimirovich, Quinn M. T. Mark
Resumo:Title screen
Although humic acids (HAs) from peat exhibit various therapeutic properties, there is little information available concerning their physicochemical and antioxidant properties. To address this issue, nine different types of peat, including oligotrophic, mesotrophic, and minerotrophic peat samples, were used for isolation of HA fractions by basic (HAb) and pyrophosphate (HAp) extractions. Physical parameters of the HAs were analyzed by UV-Vis, fluorescent, infrared (IR), and electron paramagnetic resonance (EPR) spectroscopy. Average Mr of the fractions ranged from 17.2 to 39.7 kDa, while their humification index (HIX) varied from 0.49 to 1.21. HAp fractions had a higher content of aromatic structures compared to HAb fractions. Moreover, HAp fractions had a significantly higher content of phenolic OH groups (3.6 ± 0.5 mmol/g) versus HAb (3.1 ± 0.5 mmol/g). All HA fractions exhibited antioxidant activity in radical scavenging and electrochemical assays, and their EPR signal had a single line with g = 2.0035, which is consistent with semiquinone type radicals. Furthermore, the HIX was found to be important in determining the number of semiquinone-type free radicals in the HA structures. Overall, these data provide a molecular basis to explain at least part of the beneficial therapeutic properties of peat-derived HAs.
Idioma:inglês
Publicado em: 2018
Assuntos:
труды учёных ТПУ
электронный ресурс
peat
humic acid
antioxidant
ethnopharmacology
semiquinone
natural products
торф
гуминовые кислоты
антиоксиданты
семихиноны
Acesso em linha:https://dx.doi.org/10.3390/molecules23040753
Formato: Recurso Eletrônico Capítulo de Livro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=659571

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