Effects of metal ions (Cu2+, Fe2+ and Fe3+) on HPLC analysis of catechins

Yasuda, Midori; Matsuda, Chika; OHSHIRO, Ayumi; Inouye, Kuniyo; Tabata, Masaaki

doi:10.1016/j.foodchem.2012.01.018

Cited by 19 publications

(8 citation statements)

References 26 publications

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“…Mossion et al [18] reported that the higher the mineral content in the water, the lower the extraction yield of total polyphenols in tea infusion. Yasuda et al [29] studied the HPLC peaks of catechins in the absence and presence of metal cations (Cu 2+ , Fe 2+ , and Fe 3+ ) and found that HPLC intensities of esterified catechins reduced markedly with the increasing of metal ions.…”

Section: Effect Of Different Water Samples On Catechins Concentration and Antioxidant Capacity Of Green Tea Infusionmentioning

confidence: 99%

Effect of Brewing Water on the Antioxidant Capacity of Green Tea Infusion with DPPH Assay

Cao

Zhang

et al. 2022

Journal of Chemistry

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Brewing water plays a crucial role in flavor and potential healthy functions of tea infusion. In this study, seven water samples with different physicochemical properties were selected to brew green tea. Results showed that the brewing water with higher minerals level and pH value would reduce the yield of catechins in tea infusion, which in turn caused the decrease of antioxidant activity to a large extent. Besides, it was found that EGCG, as a major contributor to the antioxidant activity of green tea infusion, was influenced differently by different metal ions, among which Ca2+/Mg2+ could enhance the antioxidant activity of EGCG solutions with different concentration through synergistic effect, particularly Ca2+, and the effect was more markable at a higher EGCG concentration. These results offered theoretical direction to the selection of tea brewing water for consumers and gave a new sight to the effects of metal ions on the antioxidant capacity of EGCG.

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Section: Effect Of Different Water Samples On Catechins Concentration and Antioxidant Capacity Of Green Tea Infusionmentioning

confidence: 99%

Effect of Brewing Water on the Antioxidant Capacity of Green Tea Infusion with DPPH Assay

Cao

Zhang

et al. 2022

Journal of Chemistry

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“…This combination of methods has appeared helpful in formulating hypotheses in cases of hormesis, redox homeodynamic equilibrium (homeostasis), and other biological phenomena [4,5,7]. Electrospray mass spectrometry has contributed to the stoichiometry clarification of transition metal coordination complexes in which natural polyphenols serve as ligands [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous investigations, this combination of methods proved very efficient [57]. Fe-catechin coordination complexes have been investigated repeatedly [10,[44][45][46]. These studies suggest that the coordination complexes of catechin are primarily formed with the o-dihydroxy group of ring B. Catechin lacks a 4-keto group that, together with the 5-hydroxy group, may serve as a second coordination center [33,46].…”

Section: Introductionmentioning

confidence: 99%

(±)-Catechin—A Mass-Spectrometry-Based Exploration Coordination Complex Formation with FeII and FeIII

Kubicová

Bachmann

Weckwerth

et al. 2022

Cells

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Catechin is an extensively investigated plant flavan-3-ol with a beneficial impact on human health that is often associated with antioxidant activities and iron coordination complex formation. The aim of this study was to explore these properties with FeII and FeIII using a combination of nanoelectrospray-mass spectrometry, differential pulse voltammetry, site-specific deoxyribose degradation assay, FeII autoxidation assay, and brine shrimp mortality assay. Catechin primarily favored coordination complex formation with Fe ions of the stoichiometry catechin:Fe in the ratio of 1:1 or 2:1. In the detected Fe–catechin coordination complexes, FeII prevailed. Differential pulse voltammetry, the site-specific deoxyribose degradation, and FeII autoxidation assays proved that coordination complex formation affected catechin’s antioxidant effects. In situ formed Fe–catechin coordination complexes showed no toxic activities in the brine shrimp mortality assay. In summary, catechin has properties for the possible treatment of pathological processes associated with ageing and degeneration, such as Alzheimer’s and Parkinson’s diseases.

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“…It was found that EGCG in phosphate buffer solution (PBS, pH 7.4) was completely degraded after storage at room temperature for 6 hr (Su, Leung, Huang, & Chen, ). Some metal ions, such as Fe 2+ was able to oxidize or catalyze the oxidation of EGCG by dissolved oxygen (Yasuda, Matsuda, Ohshiro, Inouye, & Tabata, ). In addition, EGCG degraded faster when the dissolved oxygen concentration (Zimeri & Tong, ) or temperature (Su et al, ; Wang, Zhou, & Wen, ) increased, and when exposed to light (Bianchi, Marchetti, & Scalia, ).…”

Section: Introductionmentioning

confidence: 99%

Binding affinity and antioxidant activity of the complex of (‐)‐epigallocatechin‐3‐gallate and whey protein isolate: Effect of ultrasound pretreatment

Chen

Wang

et al. 2019

J Food Process Engineering

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The binding affinity of whey protein isolate (WPI) for (-)-epigallocatechin-3-gallate (EGCG) and the antioxidant activity of the formed complexes as influenced by ultrasound pretreatment were investigated. After treated by ultrasound at 200 W for 20 min, the apparent binding constant and the number of binding sites could be increased by 10.92 times and 23.05%, respectively. This indicated that ultrasound pretreatment did enhance the binding interaction between WPI and EGCG. Ultrasound pretreatment could increase the random coil content, cause the molecular unfolding and expose more hydrophobic groups inside the molecules to be exposed to the surface. These ultrasound-induced conformational changes observed in WPI might account for its enhanced binding affinity for EGCG. Moreover, complexing with WPI could protect EGCG antioxidant activity and better protection was observed for that of ultrasound pretreated WPI. This study confirmed that ultrasound pretreatment could help the design of WPI based delivery system for EGCG. Practical applicationsDue to its good ligand-binding properties, whey protein isolate (WPI) have great potential being used as a protective carrier for (-)-epigallocatechin-3-gallate (EGCG) via the formation of WPI-EGCG complexes. As a relatively low-cost, nonhazardous, and ecofriendly technique, ultrasound has been widely applied in the modification of WPI. However, the interaction between WPI and EGCG as influenced by ultrasound pretreatment is still unknown. In this study, the effects of ultrasound pretreatment on binding capacity of WPI for EGCG and the antioxidant activity of the formed complex were investigated. The results showed that the binding interaction between WPI and EGCG could be enhanced by ultrasound pretreatment. Moreover, complexing with WPI could provide preservation of EGCG antioxidant activity and better protection were obtained by complexing EGCG with ultrasound pretreated WPI.These results were helpful for the utilization of WPI as a protective vehicle for EGCG and other polyphenols in food industry.

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Effects of metal ions (Cu2+, Fe2+ and Fe3+) on HPLC analysis of catechins

Cited by 19 publications

References 26 publications

Effect of Brewing Water on the Antioxidant Capacity of Green Tea Infusion with DPPH Assay

Effect of Brewing Water on the Antioxidant Capacity of Green Tea Infusion with DPPH Assay

(±)-Catechin—A Mass-Spectrometry-Based Exploration Coordination Complex Formation with FeII and FeIII

Binding affinity and antioxidant activity of the complex of (‐)‐epigallocatechin‐3‐gallate and whey protein isolate: Effect of ultrasound pretreatment

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