A novel class of surface-active carbohydrate esters is prepared by a two-step strategy that takes advantage of the selectivity of enzymatic catalysis and the versatility of the thiol-Michael addition reaction. The surfactant performance of the produced aliphatic, fluorinated and silicon based sugar esters are evaluated by surface tension measurements. The novel thiolated mannose, made available in this work, appears as a powerful building block for the incorporation of unprotected sugar moieties into complex molecules.
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http://dx.doi.org/10.1016/j.carres.2011.07.011 | DOI Listing |
J Am Chem Soc
December 2024
Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States.
Cyclopentachromone, distinguished by its 6/6/5 heterotricyclic ring structure, is a key building block in many bioactive natural products, yet its enzymatic origin remains unclear. We identified a new class of cyclopentachromone-containing compounds, termed isochromosulfines, characterized by unique C-S bonds. A distinct FAD-dependent monooxygenase, IscL, was identified to catalyze the formation of the 6/6/5 cyclopentadiene intermediate, 2-remisporine A, from a 6/6/6 xanthone precursor via benzene ring contraction.
View Article and Find Full Text PDFCarbohydr Polym
January 2025
College of Life Science and Technology, Gansu Agricultural University, Lanzhou 730070, China; State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China. Electronic address:
In this study, an alginate/PEG hydrogel was developed via a thiol-Michael addition reaction between oxidized quinone of catechols on dopamine-grafted sodium alginate (SA-DA) and sulfhydryl groups of 4-arm polyethylene glycol tetra-thiol (4-arm PEG-SH) under mildly basic conditions. Through the formation of thiol-terminated catechol groups, the accompanying oxidized catechols are reduced, significantly strengthening the internal network structure of the hydrogel and improving tissue adhesion. Meanwhile, the hydrogels have excellent self-healing properties due to the dynamic non-covalent bonds between the groups.
View Article and Find Full Text PDFJ Biomed Mater Res A
January 2025
Department of Biological Systems Engineering, Virginia Tech, Blacksburg, Virginia, USA.
Nanoparticles are increasingly being used in the development of vaccines for disease prevention or treatment. Recent research has demonstrated that conjugating a protein onto the surface of nanoparticles can significantly increase its immunogenicity. Considering various pathogens that threaten human health, multivalent vaccines are often desirable.
View Article and Find Full Text PDFMar Drugs
September 2024
MARE-Marine and Environmental Sciences Centre/ARNET-Aquatic Research Network, ESTM, Politécnico de Leiria, 2520-614 Peniche, Portugal.
Sphaerococcenol A is a cytotoxic bromoditerpene biosynthesized by the red alga . A series of its analogues (-) was designed and semi-synthesized using thiol-Michael additions and enone reduction, and the structures of these analogues were characterized by spectroscopic methods. Cytotoxic analyses (1-100 µM; 24 h) were accomplished on A549, DU-145, and MCF-7 cells.
View Article and Find Full Text PDFInt J Biol Macromol
September 2024
School of Stomatology, Jiangxi Medical College, Nanchang University, Nanchang 330006, China; School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, China; Jiangxi Province Key Laboratory of Oral Disease, Nanchang 330006, China; Jiangxi Province Clinical Research Center for Oral Disease, Nanchang 330006, China. Electronic address:
Bacterial infections is one of the main factors delaying the wound healing, which has become a serious challenge for healthcare systems. Zinc oxide nanoparticles (ZnO NPs), which show broad-spectrum and excellent antibacterial activity, tend to aggregate easily and therefore hardly penetrate into bacterial biofilms, showing limited anti-biofilm properties. Herein,alginate (ALG) modified ZnO NPs (ZnO@ALG) were prepared via the combination of mussel-inspired method and "thiol-Michael" click reaction, which showed excellent dispersion and biocompatibility.
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