Application of Cu2+-based electron spin resonance spectroscopy in measurement of antioxidant capacity of fruits

Tian, Sizhu; Li, Xuwen; Jiang, Jia; Wang, Kun; Zhang, Hanqi; Yu, Aimin; Zhang, Ziwei

doi:10.1007/s00216-019-02041-4

Cited by 6 publications

(3 citation statements)

References 44 publications

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“…DMPO was used as the sensitive spin-trapping agent to identify the reactive radical species of •O 2− in methanol and •OH in H 2 O. TEMP and TEMPO were applied for the detection of 1 O 2 and h + in aqueous dispersion, respectively. The g-tensors of the ESR signals were corrected by setting 2.004 g of DPPH as [77].…”

Section: Characterization Methodsmentioning

confidence: 99%

Photocatalytic Properties of Core-Shell Structured Wool-TiO2 Hybrid Composite Powders

Zhang

et al. 2020

Catalysts

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In this study, a special core–shell structured wool-TiO2 (WT) hybrid composite powder also having TiO2 nanoparticles incorporated inside cortical cells was reported. The wool pallets were pulverized from wool fibers using vibration-assisted ball milling technique and the WT powders having mesopores and macropores were produced in hydrothermal process. Experimental results indicated that the infiltrated TiO2 nanoparticles were amorphous structure, while the coated TiO2 nanoparticles were anatase phase structure. The crystallized TiO2 nanoparticles were grafted with wool pallets by the N−Ti4+/S−Ti4+/O−Ti4+ bonds. The BET surface area was measured as 153.5 m2/g and the particle sizes were in the 600–3600 nm and 4000–6500 nm ranges. The main reactive radical species of the WT powders were holes, and •O2−, 1O2, and •OH were also involved in the photodegradation of MB dye under visible light irradiation. The experimental parameters for photodegradation of MB dye solution were optimized as follows: 0.25 g/L of WT powders was added in 40 mL of 3 mg/L MB dye solution containing 50 mL/L H2O2, which resulted in the increases of COD value of degraded MB dye solution up to 916.9 mg/L at 120 min. The WT powders could be used for repeatedly photodegradation of both anionic and cationic dyes.

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Section: Characterization Methodsmentioning

confidence: 99%

Photocatalytic Properties of Core-Shell Structured Wool-TiO2 Hybrid Composite Powders

Zhang

et al. 2020

Catalysts

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“…All of the experiments were carried out in triplicate, and the results were all expressed as mean ± SD (standard deviation). The Pearson correlation matrix was used to evaluate the relationship among TPC, TAC, antioxidant capacity, α‐amylase inhibitory activity, and tyrosinase inhibitory activity (Tian et al., 2019).…”

Section: Methodsmentioning

confidence: 99%

α‐Amylase and tyrosinase inhibitory activities, phenolic contents, and antioxidant capacities of wild and cultivated blueberries

Tian

Zang

et al. 2020

J Food Process Preserv

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The phenolic compound contents, antioxidant capacities, and α‐amylase and tyrosinase inhibitory activities of 10 wild and 19 cultivated blueberries grown in northeast China were evaluated. The results showed that the α‐amylase inhibitory activities of the blueberries represented, by 1/IC50, correlated with their total phenolic contents (TPCs). Moreover, the tyrosinase inhibitory activities correlated with the total anthocyanin contents (TACs). High‐performance liquid chromatography and electrospray mass spectrometry were conducted to determine and identify seven phenolic acids. The average caffeic acid contents of the cultivated and wild blueberries were 277.37 and 17.71 μg/g, respectively. The total phenolic, anthocyanin, and flavonoid contents were determined. Wild blueberries have higher TPCs, α‐amylase inhibitory activities, and antioxidant capacities. Cultivated blueberries have higher TACs and exhibit tyrosinase inhibitory activities similar to those of the wild ones. Practical applications This study revealed that wild blueberries have high α‐amylase inhibitory activities and are effective as natural α‐amylase inhibitors for the treatment of diabetes. In addition, wild blueberries were found to be rich in phenolics and have high antioxidant capacities. Thus, because of these properties, wild blueberry products with antidiabetic and antioxidant potential can be developed for use in biomedical and pharmaceutical industries.

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“…High correlation between EPR spectroscopy and UV-VIS spectrophotometry was found even in quantifying the antioxidant capacity of different types of compounds and substrates. [55][56][57] Decline of ABTS * + concentration caused by the antioxidant action of test substances was recalculated in TEAC EPR values ( [29,42] TEAC EPR values were significantly lower compared to TEAC UV (p < 0.05). Ubiquinol reacts even with reactive nitrogen species in vivo produced in oxidation process of mitochondria.…”

Section: Abtsmentioning

confidence: 99%

Antioxidant Efficacy of Natural Ubiquinol Compared to Synthetic References – In Vitro Study

et al. 2021

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There are many studies dealing with the oxidized form (Ubiquinone) of coenzyme Q10, but only a little of its reduced form (Ubiquinol). Two yeast-based Ubiquinols (UQH 2 _S, Sigma-Aldrich; UQH 2 _K, Kaneka) were investigated for in vitro antioxidant efficacy compared to synthetic antioxidants. The antioxidant efficacy of UQH2_S and UQH2_K by the 2,2-diphenyl-1picrylhydrazyl' (DPPH) assay as well as by the 2,2'-azino-bis(3ethylbenzthiazoline-6-sulfonic) acid' (ABTS) assay was almost identical (IC50 DPPH/ABTS 0.387/0.226-0.219 mM, respectively). The values were higher (p < 0.05) than that of α-tocopherol, Gallic acid, Butylhydroxyanisole, Butylhydroxytoluene. Ferric Reducing Antioxidant Power' values for Ubiquinols (0.05-0.3 mM) were higher (p < 0.05) than for the other antioxidants, except Gallic acid. According to the Electron paramagnetic resonance assay, the antioxidant activity of α-tocopherol/UQH 2 _S mixture was higher compared to the individual antioxidant only in specific combinations.

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Application of Cu2+-based electron spin resonance spectroscopy in measurement of antioxidant capacity of fruits

Cited by 6 publications

References 44 publications

Photocatalytic Properties of Core-Shell Structured Wool-TiO2 Hybrid Composite Powders

Photocatalytic Properties of Core-Shell Structured Wool-TiO2 Hybrid Composite Powders

α‐Amylase and tyrosinase inhibitory activities, phenolic contents, and antioxidant capacities of wild and cultivated blueberries

Antioxidant Efficacy of Natural Ubiquinol Compared to Synthetic References – In Vitro Study

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