Reactive oxygen species responsible for beta-glucan degradation

Faure, Audrey M.; Werder, Julia; Nyström, Laura

doi:10.1016/j.foodchem.2013.02.096

Cited by 37 publications

(19 citation statements)

References 25 publications

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“…In previous studies, we observed that the formation of hydroxyl radical could be sustained for up to a week in beta-glucan treated with solely iron(II). We assumed that beta-glucan has the ability to reduce iron(III) (Faure et al, 2013). Here, too, we may speculate that betaglucan acts as a reducing agent.…”

Section: Discussionmentioning

confidence: 98%

“…lactones, carboxylic acids, ketones and aldehydes) on the beta-glucan residues. Several studies have also reported that the treatment of beta-glucan solutions with ascorbic acid and iron(II) leads to a drastic loss of viscosity of the solutions, which demonstrates a degradation of the polysaccharide (Faure et al, 2012a;Faure, Münger, & Nyström, 2012b;Faure, Werder, & Nyström, 2013;Kivela, Gates, & Sontagstrohm, 2009;Kivelä, Nyström, Salovaara, & Sontag-Strohm, 2009). This degradation was directly related to the generation of hydroxyl radicals promoted by the presence of the system ascorbic acid/iron(II) (Faure et al, 2012a).…”

Section: Introductionmentioning

confidence: 99%

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Iron(II) binding by cereal beta-glucan

Faure¹,

Koppenol²,

Nyström³

2015

Carbohydrate Polymers

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Iron(II) binding by cereal beta-glucan

Faure¹,

Koppenol²,

Nyström³

2015

Carbohydrate Polymers

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“…Duan and Kasper, (2011) determined that • OH was the most powerful ROS, implicating it in the oxidative harm of a large group of biological molecules that included carbohydrates. Evidently, H 2 O 2 contributes to • OH production, to which polysaccharide decrease is attributed; autooxidation and accumulation of • OH also results in further reductions in β-glucan (Faure et al, 2013). Liu et al, (2005) obtained data that confirmed peroxidase activity in the presence of polysaccharides.…”

Section: Biochemical Estimationmentioning

confidence: 88%

“…These free radicals are shown to attack the polysaccharide chain by abstracting the carbon-bound hydrogen. Obviously, • OH has a high degree of reactivity along with the ROS species, O 2 •− and H 2 O 2 (Faure et al, 2013). Duan and Kasper, (2011) determined that • OH was the most powerful ROS, implicating it in the oxidative harm of a large group of biological molecules that included carbohydrates.…”

Section: Biochemical Estimationmentioning

confidence: 99%

Accumulation of antioxidants in rice callus (Oryza sativa L.) induced by β-glucan and salt stress

Alhasnawi¹,

Zain²,

Kadhimi³

et al. 2017

Aust J Crop Sci

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Salinity stress causes a considerable reduction in callus growth. Mushroom polysaccharides (β-glucan) are the most promising groups of antioxidant compounds. An in vitro experiment was conducted to evaluate the potential function of exogenously applied β-glucan in alleviating the accumulation of antioxidants in rice callus. In this study, morphological, chemical, and biochemical parameters of an embryogenic callus of the rice variety, MR269, were investigated under 200mM NaCl stress conditions after pre-treatment with (0, 0.5, 1 and 1.5 mg/L) β-glucan in culture media. The present study sought to evaluate chemical, biochemical, and callus growth characterization. The results revealed that callus exposed to stressful media exhibited a significant decrease in callus growth and contents of K + and Ca +2. In addition, significant accumulation of Na + and Na + /K + was found, as well as an enhanced enzymatic antioxidant system and elevated proline activities under NaCl conditions. Furthermore, exogenous addition of β-glucan at 0.5-1.5mg/L under NaCl stress induced a pronounced, significant increase of callus growth, K + and Ca +2 contents, and enzymatic antioxidant and proline activities. In contrast, a significant decrease was found in the levels of Na + and Na + /K + , particularly in callus treated with NaCl. β-Glucan ameliorates the adverse effects of NaCl stress, and the extent of amelioration depends on the type of β-glucan agent as well as treatment duration (three months). The changes mentioned are important for determining the morphological, chemical, and biochemical parameters of salinity tolerance in callus. This study demonstrated that exogenous β-glucan exhibits alleviation of the harmful effects of salt stress and increases salinity resistance in callus rice.

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“…Despite the stereo effects limiting the formation of carbohydrate radicals, a vast number of oxidation products can be formed during carbohydrate oxidation induced by HO • , as previously observed for the mannosyl and galactomannosyl oligosaccharides submitted to conditions of Fenton reaction (Fe 2+ /H 2 O 2 ) . However, previous studies have reported the carbohydrate oxidation with HO • generated simply by the presence of Fe 2+ . The most reported mechanism by which Fe 2+ is involved in formation of HO • includes three reactions .…”

Section: Introductionmentioning

confidence: 99%

Neutral and acidic products derived from hydroxyl radical-induced oxidation of arabinotriose assessed by electrospray ionisation mass spectrometry

et al. 2014

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The oxidation of α-(1 → 5)-L-arabinotriose (Ara3), an oligosaccharide structurally related to side chains of coffee arabinogalactans, was studied in reaction with hydroxyl radicals generated under conditions of Fenton reaction (Fe(2+)/H2O2). The acidic and neutral oxidation products were separated by ligand exchange/size-exclusion chromatography, subsequently identified by electrospray ionisation mass spectrometry (ESI-MS) and structurally characterised by tandem MS (ESI-MS/MS). In acidic fraction were identified several oxidation products containing an acidic residue at the corresponding reducing end of Ara3, namely arabinonic acid, and erythronic, glyceric and glycolic acids formed by oxidative scission of the furanose ring. In neutral fractions were identified derivatives containing keto, hydroxy and hydroperoxy moieties, as well as derivatives resulting from the ring scission at the reducing end of Ara3. In both acidic and neutral fractions, beyond the trisaccharide derivatives, the corresponding di- and monosaccharide derivatives were identified indicating the occurrence of oxidative depolymerisation. The structural characterisation of these oxidation products by ESI-MS/MS allowed the differentiation of isobaric and isomeric species of acidic and neutral character. The species identified in this study may help in detection of roasting products associated with the free radical-mediated oxidation of coffee arabinogalactans.

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Reactive oxygen species responsible for beta-glucan degradation

Cited by 37 publications

References 25 publications

Iron(II) binding by cereal beta-glucan

Iron(II) binding by cereal beta-glucan

Accumulation of antioxidants in rice callus (Oryza sativa L.) induced by β-glucan and salt stress

Neutral and acidic products derived from hydroxyl radical-induced oxidation of arabinotriose assessed by electrospray ionisation mass spectrometry

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