Abstract:
:Interactions between transition metal ions and polyphenols can result in complexation, redox or polymerization, but the relative importance of these reactions is unclear. The present paper reports results from the reaction of gallic acid (GA) with Cu(II) using electron paramagnetic resonance (EPR) and UV/visible spectroscopy for various relative concentrations and pH values. Reduction of Cu(II) by GA does not occur under strongly acidic or strongly alkaline conditions. Di- or polymerization reactions between Cu(II) and carboxylate groups of GA dominate the results at acidic pH, whereas mononuclear complexes increase in importance at higher pH and GA concentrations. There was no evidence for any redox reaction between Cu(II) and GA and free radical formation from GA at high pH was shown to be the consequence of auto-oxidation, which was inhibited by Cu(II). Serious questions are thus raised about the existence of the frequently assumed redox reactions between Cu(II) and polyphenols.
journal_name
Free Radic Resjournal_title
Free radical researchauthors
Severino JF,Goodman BA,Reichenauer TG,Pirker KFdoi
10.3109/10715762.2010.515220subject
Has Abstractpub_date
2011-02-01 00:00:00pages
115-24issue
2eissn
1071-5762issn
1029-2470journal_volume
45pub_type
杂志文章abstract::8-Oxoguanine (8-oxoG) is the most common DNA base modification in the mammalian genome, associated with oxidative stress. Here we analysed the alterations in the distribution of 8-oxoG across the entire murine genome, before and after an elevation of oxidative stress by the use of ferric nitrilotriacetate (Fe-NTA) as ...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715762.2020.1733548
更新日期:2020-04-16 00:00:00
abstract::The protecting ability of the Piper betle leaves-derived phenol, allylpyrocatechol (APC) against AAPH-induced membrane damage of human red blood cells (RBCs) was investigated. Compared to control, AAPH (50 mM) treatment resulted in significant hemolysis (55%, p < 0.01), associated with increased malondialdehyde (MDA) ...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2013.816847
更新日期:2013-09-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
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journal_title:Free radical research
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1080/10715769900300341
更新日期:1999-04-01 00:00:00
abstract::Coenzyme Q10 (CoQ10) is an essential cofactor of the electron transport gene as well as an important antioxidant, which is particularly effective within mitochondria. A number of prior studies have shown that it can exert efficacy in treating patients with known mitochondrial disorders. We investigated the potential u...
journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.1080/10715760290021315
更新日期:2002-04-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.3109/10715762.2013.815347
更新日期:2013-08-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760802069462
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2015.1011153
更新日期:2015-04-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2013.783210
更新日期:2013-05-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
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更新日期:2009-03-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.3109/10715762.2011.611509
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journal_title:Free radical research
pub_type: 杂志文章
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更新日期:2019-10-01 00:00:00
abstract::Asthma is an allergic inflammation driven by the Th2 immune response with release of cytokines such as IL-4 and IL-13, which contribute to the airflow limitations and airway hyperresponsiveness (AHR). The involvement of oxidative stress in this process is well-established, but the specific role of the superoxide anion...
journal_title:Free radical research
pub_type: 杂志文章
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更新日期:2017-07-01 00:00:00
abstract::The present study was designed to determine whether hydroxymethylglutaryl-CoA reductase inhibitors (statins) modulate the NO production via iNOS in adipocytes stimulated by lipopolysaccharide (L) and tumour necrosis factor-alpha (T). Well-differentiated 3T3-L1 adipocytes significantly produced NO by LT-treatment. Pre-...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760701534368
更新日期:2007-09-01 00:00:00
abstract::Macrophages produce reactive oxygen species such as O2-, H2O2 and *OH that contribute to the pathogenesis of diseases such as inflammation and atherosclerosis. The cells have multiple defense systems against those reactive oxygen species, and we describe here such an oxidative stress-inducible defense system. Upon exp...
journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.1080/10715769900300921
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760290025906
更新日期:2002-05-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715769709097807
更新日期:1997-03-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760701286159
更新日期:2007-06-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.1080/10715762.2016.1248961
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journal_title:Free radical research
pub_type: 杂志文章,评审
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715769809065799
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715769709097838
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abstract::The impact of classic cardiovascular risk factors on oxidative stress status in a high-risk cardiovascular Mediterranean population of 527 subjects was estimated. Oxidative stress markers (malondialdehyde, 8-oxo-7'8'-dihydro-2'-deoxyguanosine, oxidized/reduced glutathione ratio) together with the activity of antioxida...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715760903247231
更新日期:2009-12-01 00:00:00
abstract::We have here investigated possible occurrence of bicarbonate-dependent, carbonate radical anion (CO(3)(•-))-driven tocopherol-mediated human LDL peroxidation (TMP) in vitro and in vivo. CO(3)(•-), generated in vitro by the SOD1/H(2)O(2)/bicarbonate system, readily promoted TMP, which was dependent on α-tocopherol and ...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2012.719613
更新日期:2012-11-01 00:00:00
abstract::The potential protective effect of the dietary antioxidant curcumin (120 mg/Kg/day for 6 days) against the renal injury induced by maleate was evaluated. Tubular proteinuria and oxidative stress were induced by a single injection of maleate (400 mg/kg) in rats. Maleate-induced renal injury included increase in renal v...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2014.954109
更新日期:2014-11-01 00:00:00
abstract::To solve the problems faced in clinical use of hypocrellins, a water-soluble preparation of Hypocrellin B (HB), HB-Triton X-100 (TX-100) micelles, was prepared. To evaluate the photodynamic activity, the free radicals (*OH and HB*-) and singlet oxygen (1O2) generated via photosensitization of the preparation in aqueou...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760310001601056
更新日期:2003-10-01 00:00:00
abstract::We investigated whether oxidant status and antioxidant enzyme activities during ageing of mouse brain are regulated in sex-dependent manner. In the homogenate from the brain of 1, 4, 10 and 18 months old male and female CBA mice, lipid peroxidation (LPO), total superoxide dismutase (tSOD), catalase (CAT) and glutathio...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/1071576031000102178
更新日期:2003-07-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2014.960410
更新日期:2014-12-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760100300411
更新日期:2001-05-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760903137101
更新日期:2009-10-01 00:00:00