LC-ESI-MS/MS Characterization of Concentrated Polyphenolic Fractions from and Their Anti-Inflammatory and Antioxidant Activities

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2022 Feb 15

PMID 35164090

Authors

Lena Lyko

Marta Olech

Renata Nowak

Affiliations

Soon will be listed here.

Abstract

The high biological potential of polyphenols encourages the search for new natural sources of and biomedical applications for these compounds. Sweet was previously reported to contain pharmaceutically active polyphenols. The present research investigates the polyphenolic fractions in leaves, including a determination of the free and bound phenolic acid and flavonoid contents and their anti-inflammatory and antioxidant activities. LC-ESI-MS/MS (liquid chromatography/electrospray ionization triple quadrupole mass spectrometry) analysis revealed a great abundance of free (e.g., 5--caffeoylquinic acid, ferulic acid, protocatechuic acid, catechin, and dihydromyricetin) and bound (e.g., caffeic acid, -coumaric, protocatechuic acid, myricetin, quercetin) phenolics. The samples exhibited high anti-inflammatory potential in lipoxygenase (IC: 0.33 ± 0.01-2.96 ± 0.06 mg dry extract (DE)/mL) and hyaluronidase (IC: 78.76 ± 2.09 - 429.07 ± 31.08 µg DE/mL) inhibition capacity assays. Some samples also had the ability to inhibit cyclooxygenase 1 (IC: 311.8 ± 10.95 µg DE/mL) and cyclooxygenase 2 (IC: 53.40 ± 5.07; 608.09 ± 14.78 µg DE/mL). All fractions showed excellent antioxidant activity in the Oxygen Radical Absorbance Capacity (ORAC) assay (5.76-221.81 g Trolox/g DE), ABTS radical scavenging ability (0.62 ± 0.03 - 5.09 ± 0.23 g Trolox/g DE), and moderate ion (Fe) chelating power. This paper expands our knowledge of the phytochemistry and pharmacological activity of polyphenols. It reveals, for the first time, the presence of dihydromyricetin, afzelin, and laricitrin in the plant material. It indicates biologically active polyphenolic fractions that should be further investigated or which could be efficiently used in pharmaceutical, cosmetic, or nutraceutical applications.

Citing Articles

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