Chemical modification of the natural flavonoid myricetin

Polyakov, V. V.

doi:10.1007/bf02238204

Cited by 19 publications

(9 citation statements)

References 3 publications

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“…3b). These indicated that the B-ring structure made myricetin more sensitive to thermal condition than kaempferol or quercetin, and which might be favor of the interaction between EGCG and myricetin during the thermal treatment (Polyakov 1999). Because of focusing on color changes, HPLC chromatograms of K, Q and M alone were monitored at 480 nm, there was no peak before and after thermal treatment, more attention was paid to compare EGCG and mixed model solutions.…”

Section: Hplc Analysis Of Model Solutionmentioning

confidence: 99%

Effect of interaction of epigallocatechin gallate and flavonols on color alteration of simulative green tea infusion after thermal treatment

Dai

et al. 2017

J Food Sci Technol

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Epigallocatechin gallate (EGCG) and flavonols are important phenolic compounds in green tea. These compounds are sensitive to thermal condition and their structural alteration results in making browning the green tea infusion. This study aimed to research the interaction between EGCG and flavonols during thermal infusion. EGCG and flavonols model solutions were prepared based on concentration in green tea infusion, and their colors appearance and attributes were analyzed in 10 h by thermal treatment. Results showed that kaempferol, quercetin, and myricetin accelerated the oxidation of EGCG and made the model solution browning. HPLC analysis revealed there was an obvious shift of a broaden peak in the mixed model solution of EGCG and flavonols after thermal treatment. This broaden peak was further purified on HPLC and solid phase extraction methods to yield colored complexes. The complexes showed the maximal absorption around 424, 442, and 482 nm. MS/MS analysis revealed that the complexes possessed of three components those were consisted of the interaction between EGCG and myricetin. These results indicated that the interaction between EGCG and flavonols might form complexes during thermal treatment, The complexes were contributed to make green tea infusion browning.

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Section: Hplc Analysis Of Model Solutionmentioning

confidence: 99%

Effect of interaction of epigallocatechin gallate and flavonols on color alteration of simulative green tea infusion after thermal treatment

Dai

et al. 2017

J Food Sci Technol

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“…NMR spectra were recorded on Bruker WM 250 (250 ( 1 H) and 63 MHz ( 13 C)) and Bruker AC 200 instruments (200 ( 1 H) and 50 MHz ( 13 C)) in DMSO d 6 . Chemical shifts are given on the δ scale with reference to SiMe 4 .…”

Section: Methodsmentioning

confidence: 99%

“…1- 6 In the last few years, functionalized chromenes have found increasingly frequent use in biomedicinal chemistry. 7-10 For example, 4H chromenes containing the cyano group (especially (4H chromen 4 yl)malononitriles) are em ployed for treatment of inflammatory arthritis and some kinds of cancers.…”

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confidence: 99%

Electrocatalytic chain transformation of salicylaldehyde and CH acids into substituted 4H-chromenes

et al. 2008

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“…Chromene derivatives have attracted great interest due to biological and pharmacological activities such as anti-coagulant, anti-cancer, spasmolytic, diuretic, anti-anaphylatic, etc. Furthermore, the chromene derivatives are widely found in natural alkaloids, flavonoids, tocopherols, and anthocyanins [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A green approach to electrosynthesis of chromeno[3’,4’:5,6] pyrano [2,3-d] pyrimidines

Kazemi-Rad¹

2018

Anal. Method Environ. Chem. J.

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Eletrochemistry is a broad, useful, and selective technique method in many research fields. Among them, the investigation of performance of electrochemical methods in determination, synthesis and selective reduction/oxidation of different elements and molecules have attracted growing attention due their intrinsic advantages such as selectivity, low cost, and high yield of synthesis. Moreover, electrocatalytic synthesis of organic molecules is known as a green and environmentally benign method. In the present form, electrocatalytic multicomponent transformation of barbituric acid, aromatic aldehydes, and 4-hydroxycumarin was carried out. The electrocatalytic transformation was done in alcohols in the presence of tetrabutylammounium flouride as an electrolyte in an undivided cell containing an iron electrode as the cathode and a Pt electrode as the anode at a constant current leads to substituted chromeno[3’,4’:5,6] pyrano[2,3-d] pyrimidines in good to high yields (54-92%) at room temperature. The yield of reaction was obtained by gravimetric analysis and calculated upon theoretical conversion.

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Chemical modification of the natural flavonoid myricetin

Cited by 19 publications

References 3 publications

Effect of interaction of epigallocatechin gallate and flavonols on color alteration of simulative green tea infusion after thermal treatment

Effect of interaction of epigallocatechin gallate and flavonols on color alteration of simulative green tea infusion after thermal treatment

Electrocatalytic chain transformation of salicylaldehyde and CH acids into substituted 4H-chromenes

A green approach to electrosynthesis of chromeno[3’,4’:5,6] pyrano [2,3-d] pyrimidines

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