Phytochemical investigation of the leaf extract of Roxb. ex Hornem led to the isolation and identification of two new highly oxygenated cyclohexenes, uvariagrandols A () and B (), together with seven known compounds (-). Their structures were elucidated by spectroscopic methods as well as comparisons made from the literature. The (1,2,3,6) absolute configuration of uvariagrandols A and B was established by the comparison of the experimental and calculated electronic circular dichroism (ECD). (+)-Grandifloracin () displayed cytotoxicity against SW480 and K562 cell lines with IC values of 154.9 and 60.9 μM, respectively. 6-Methoxyzeylenol () had -glucosidase inhibitory activity with the IC value of 34.1 μM.
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http://dx.doi.org/10.1016/j.heliyon.2024.e41326 | DOI Listing |
Nano Lett
January 2025
Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.
Solar-powered electrochemical NH synthesis offers the benefits of sustainability and absence of CO emissions but suffers from a poor solar-to-ammonia yield rate (SAY) due to a low NH selectivity, large bias caused by the sluggish oxygen evolution reaction, and low photocurrent in the corresponding photovoltaics. Herein, a highly efficient photovoltaic-electrocatalytic system enabling high-rate solar-driven NH synthesis was developed. A high-performance Ru-doped Co nanotube catalyst was used to selectively promote the nitrite reduction reaction (NORR), exhibiting a faradaic efficiency of 99.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Northeast Forestry University, Chemical Engineering and Resource Utilization, CHINA.
Electrochemical 5-hydroxymethylfurfural (HMF) oxidation reaction (HMFOR) offers a promising route to transform biomass into value-added chemicals. However, the competing oxygen evolution reaction (OER) greatly limits the HMFOR selectivity. Herein, we report a facile doping strategy to engineer oxygen intermediates adsorption on amorphous NiFe alloys to boost highly selective electrochemical HMF oxidation to produce 2,5-furandicarboxylic acid (FDCA), among which, amorphous Mn-doped NiFeB alloy displays a low HMFOR onset potential of 1.
View Article and Find Full Text PDFAdv Mater
January 2025
School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
Developing highly efficient catalysts to accelerate sluggish electrode reactions is critical for the deployment of sustainable aqueous electrochemical technologies, yet remains a great challenge. Rationally integrating functional components to tailor surface adsorption behaviors and adsorbate dynamics would divert reaction pathways and alleviate energy barriers, eliminating conventional thermodynamic constraints and ultimately optimizing energy flow within electrochemical systems. This approach has, therefore, garnered significant interest, presenting substantial potential for developing highly efficient catalysts that simultaneously enhance activity, selectivity, and stability.
View Article and Find Full Text PDFSci Rep
January 2025
Department of Chemistry, Yazd University, Yazd, Iran.
A new humic acid-based nanomagnetic copper(II) composite was prepared and used as an eco-friendly recoverable catalyst for synthesizing 1,4-disubstituted 1,2,3-triazoles. The synthesis was done via the three-component click reaction of alkyl halide, sodium azide, and terminal alkyne with good to excellent yield. A simple magnetic copper acetate composite, FeO@HA-Cu(OAc), was prepared using humic acid and characterized by SEM, TEM, XRD, EDX, EDS-mapping, VSM, TGA, AAS, and FT-IR.
View Article and Find Full Text PDFPLoS One
January 2025
Institute of Natural Antioxidants and Anti-Inflammation, Dali University, Dali, Yunnan, China.
Oxidative damage, oxidative inflammation, and a range of downstream diseases represent significant threats to human health. The application of natural antioxidants and anti-inflammatory agents can help prevent and mitigate these associated diseases. In this study, we aimed to investigate the effectiveness of walnut green husk (WNGH) as an antioxidant and anti-inflammatory agent in an in vitro setting.
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