ellagitannin and proanthocyanidin

ellagitannin has been researched along with proanthocyanidin* in 2 studies

Other Studies

2 other study(ies) available for ellagitannin and proanthocyanidin

Article	Year
Separation of Ellagitannin-Rich Phenolics from U.S. Pecans and Chinese Hickory Nuts Using Fused-Core HPLC Columns and Their Characterization. Journal of agricultural and food chemistry, 2017, Jul-19, Volume: 65, Issue:28 U.S. pecans and Chinese hickory nuts possess a wide array of phenolic constituents with potential health benefits including phenolic acids and proanthocyanidins. Only limited information is available, however, on their compositions. The present study optimized the separation performance and characterized the low-molecular-weight phenolic fractions of these nuts with C18 and pentafluorophenyl (PFP) fused-core LC columns by employing a kinetic approach. Although both types of reversed-phase columns demonstrated similar performance in general, the PFP column furnished greater plate numbers and superior peak shapes for the low-molecular-weight fractions as well as overall separations of ellagic acid derivatives. The high-molecular-weight fraction of pecans, analyzed by a 3-μm HILIC column, possessed more proanthocyanidins than the Chinese hickory nuts with dimers and trimers (31.4 and 18.34 mg/g crude extract, respectively) being present at the greatest levels. Chinese hickory nuts had lower proanthocyanidin content but possessed tetramers and pentamers at 4.46 and 4.01 mg/g crude extract, respectively. Topics: Carya; China; Chromatography, High Pressure Liquid; Hydrolyzable Tannins; Nuts; Phenols; Plant Extracts; Proanthocyanidins; United States	2017
Chemical studies of proanthocyanidins and hydrolyzable tannins. Antioxidants & redox signaling, 2001, Volume: 3, Issue:6 We investigated a number of natural polyphenols representing flavan-3-ols, gallotannins, and ellagitannins with regard to their antioxidant potential. For this purpose we used pulse radiolysis to determine scavenging rate constants with hydroxyl radicals and decay rates of the respective aroxyl radicals and EPR spectroscopy to identify the radicals after in situ oxidation. Using NMR spectroscopy, we could confirm phenolic coupling reactions of epigallocatechin gallate and pentagalloyl glucose after radical-induced oxidation. Topics: Anthocyanins; Antioxidants; Catechin; Dimerization; Electron Spin Resonance Spectroscopy; Hydrogen Peroxide; Hydrolysis; Hydrolyzable Tannins; Hydroxyl Radical; Magnetic Resonance Spectroscopy; Models, Chemical; Oxygen; Phenol; Proanthocyanidins; Tannins; Time Factors	2001

Article

Year

Separation of Ellagitannin-Rich Phenolics from U.S. Pecans and Chinese Hickory Nuts Using Fused-Core HPLC Columns and Their Characterization.

Journal of agricultural and food chemistry, 2017, Jul-19, Volume: 65, Issue:28

U.S. pecans and Chinese hickory nuts possess a wide array of phenolic constituents with potential health benefits including phenolic acids and proanthocyanidins. Only limited information is available, however, on their compositions. The present study optimized the separation performance and characterized the low-molecular-weight phenolic fractions of these nuts with C18 and pentafluorophenyl (PFP) fused-core LC columns by employing a kinetic approach. Although both types of reversed-phase columns demonstrated similar performance in general, the PFP column furnished greater plate numbers and superior peak shapes for the low-molecular-weight fractions as well as overall separations of ellagic acid derivatives. The high-molecular-weight fraction of pecans, analyzed by a 3-μm HILIC column, possessed more proanthocyanidins than the Chinese hickory nuts with dimers and trimers (31.4 and 18.34 mg/g crude extract, respectively) being present at the greatest levels. Chinese hickory nuts had lower proanthocyanidin content but possessed tetramers and pentamers at 4.46 and 4.01 mg/g crude extract, respectively.

Topics: Carya; China; Chromatography, High Pressure Liquid; Hydrolyzable Tannins; Nuts; Phenols; Plant Extracts; Proanthocyanidins; United States

2017

Chemical studies of proanthocyanidins and hydrolyzable tannins.

Antioxidants & redox signaling, 2001, Volume: 3, Issue:6

We investigated a number of natural polyphenols representing flavan-3-ols, gallotannins, and ellagitannins with regard to their antioxidant potential. For this purpose we used pulse radiolysis to determine scavenging rate constants with hydroxyl radicals and decay rates of the respective aroxyl radicals and EPR spectroscopy to identify the radicals after in situ oxidation. Using NMR spectroscopy, we could confirm phenolic coupling reactions of epigallocatechin gallate and pentagalloyl glucose after radical-induced oxidation.

Topics: Anthocyanins; Antioxidants; Catechin; Dimerization; Electron Spin Resonance Spectroscopy; Hydrogen Peroxide; Hydrolysis; Hydrolyzable Tannins; Hydroxyl Radical; Magnetic Resonance Spectroscopy; Models, Chemical; Oxygen; Phenol; Proanthocyanidins; Tannins; Time Factors

2001