Records of Natural Products
A scientific open access journal in the field of natural products.LATEST ARTICLES
Bromophenols from the Marine Red Alga Symphyocladia latiuscula and Their Radical Scavenging Activity

A new (1) and five known (2-6) bromophenols were isolated from the organic extract of the marine red alga Symphyocladia latiuscula. Their structures were assigned by interpretation of NMR and MS data, and these compounds were determined as 2,3,5′-tribromo-3′,4,4′,5-tetrahydroxy-diphenylmethane (1), 2-methoxy-3-bromo-5-hydroxymethylphenol (2), 5-(2,3-dihydroxybenzyl)-3,4-dibromobenzene-1,2-diol (3), 5-(2-bromo-3,4-dihydroxy-6-(methoxymethyl)benzyl)-3,4-dibromobenzene-1,2-diol(4), methyl 2-(3,5-dibromo-4-hydroxybenyl) acetate (5), and 3,4-dibromo-5-(methoxymethyl)benzene-1,2-diol (6). All these compounds were evaluated for DPPH radical scavenging activity, and they displayed potent antioxidant activity with IC50 values ranging from 9.6 to 31.5 μM. These compounds also showed moderate ABTS radical scavenging activity with TEAC value ranging from 2.1 to 3.0 mM. The results suggested that these bromophenols or the marine red alga S. latiuscula may have potential application in food as natural antioxidants.
DOI http://doi.org/10.25135/rnp.394.2304.2764 Keywords Symphyocladia latiuscula bromophenols secondary metabolites antioxidant activity Available online: May 17, 2023 DETAILS DOWNLOAD PDF © ACG Publications. All rights reserved.
Protective Effect of Syzygium jambos (L.) Leaf Extract and Its Constituents Against LPS-induced Oxidative Stress

Oxidative stress is one of the leading causes that contribute to the pathogenesis of chronic diseases based on the imbalance between free radicals and the antioxidant defense system. Here, Syzygium jambos (L.) Aston, a traditional herb used to treat various diseases, was evaluated using RAW264.7 macrophages with lipopolysaccharide (LPS)-stimulation to demonstrate its effects and find a new therapy for oxidative stress. This study proved that Syzygium jambos leaf extract exerted its ability to protect cells against oxidative stress via activating the nuclear factor erythroid 2-related factor 2/heme oxygenase-1 (Nrf2/HO-1) pathway to suppress reactive oxygen species (ROS) production. Moreover, the extract also attenuated the nitric oxide (NO) production and the nitric oxide synthase (iNOS) expression, suggesting an anti-inflammatory response. In addition, four active compounds, including gallic acid, quercetin, myricetin, and caffeic acid, were isolated from ethyl acetate fraction using column chromatography. The structure of compounds was analyzed based on one-dimensional nuclear magnetic resonance (1D-NMR) and compared to literature data. Their biological activity was confirmed by promoting the induction of HO-1. Hence, this study provides the initial evidence of Syzygium jambos leaves protective effects and highlights its potential as an antioxidant agent.
DOI http://doi.org/10.25135/rnp.393.2303.2730 Keywords macrophage cell nuclear factor erythroid 2-related factor 2 oxidative stress Syzygium jambos (L.) Aston Available online: May 17, 2023 DETAILS DOWNLOAD PDF © ACG Publications. All rights reserved.A New Isobenzofuranone Derivative from Arctic Fungus Gyoerffyella sp. CPCC 401434











A new isobenzofuranone derivative, (R)-3-acetyl-[5,7]-dimethoxy-3H-isobenzofuran-l-one (1), together with six known compounds, (R)-3-acetyl-7-hydroxy-5-methoxy-3H-isobenzofuran-l-one (2), banksialactone D (3), (3R,4S)-3,8-dihydroxy-3-hydroxymethyl-6-methoxy-4,5-dimethyl-isochroman-1-one (4), 1-O-[α-L-rhamnopyranosyl]-2,5-dimethyl-3-phenol (5), p-hydroxybenzaldehyde (6), 2-(4-hydroxyphenyl) ethanol (7), were isolated from Arctic fungus Gyoerffyella sp. CPCC 401434. Their structures and absolute configurations were elucidated by the analysis of spectroscopic data, electronic circular dichroism, and comparison with reported literature data. Herein, all compounds were reported for the first time from the genus Gyoerffyella and their cytotoxic and antibacterial activities.
DOI http://doi.org/10.25135/rnp.392.2211.2629 Keywords Arctic fungus Gyoerffyella isobenzofuranone cytotoxicity Available online: May 16, 2023 DETAILS DOWNLOAD PDF © ACG Publications. All rights reserved.Penicisepene, A New Sesquiterpenoid from the Fungus Penicillium sp. LPFH-Q3

The secondary metabolites of the strain Penicillium sp. LPFH-Q3 isolated from the sea sediment were investigated. A new eremophilane sesquiterpene, named penicisepene (1), along with seven known compounds (2-8) was obtained. The structures of the metabolites were elucidated based on spectroscopic analysis including 1H NMR, 13C NMR, 1H-1H COSY, HSQC, HMBC, NOESY, and the MS data. The absolute configuration of 1 was established via comparison of the experimental and density functional theory predicted ECD data. Compound 1, an eremophilane sesquiterpene containing a hexenic acid, was scarcely found in nature. Besides, the NMR data of 3 and 4 in methanol-d4 were reported for the first time. Biological evaluation showed that compounds 1, 3, and 4 showed inhibitory activity comparable to the positive control quercetin (16.7 uM) on NO production in LPS-activated RAW 264.7 macrophages with IC50 values of 13.2, 10.6, 17.9 uM, respectively.
DOI http://doi.org/10.25135/rnp.390.2303.2747 Keywords Penicillium sp. marine fungus sesquiterpene NO production Available online: May 11, 2023 DETAILS DOWNLOAD PDF © ACG Publications. All rights reserved.