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    Item type:Publication,
    Phenylthiadiazole-Based Schiff Base Fluorescent Chemosensor for the Detection of Al3+ and Zn2+ Ions
    (MDPI AG, 2025-08-08) ;
    Ariana Fiallos-Ayala
    ;
    Amanda Cevallos-Vallejo
    Aluminum (Al) and zinc (Zn) are two of the most widely used metals in industry, and their excessive accumulation in the body has been linked to serious diseases like Alzheimer’s, Parkinson’s, and cancer. This highlights the need for effective ways to detect and measure them. In this study, we synthesized the fluorescent chemosensor 1, which contains a Schiff base and a 1,3,4-thiadiazole ring in its structure, and evaluated its fluorescent response in the presence of various metal ions. The chemosensor enabled the selective quantification of Al3+ and Zn2+ ions through excitations at different wavelengths, yielding differentiated fluorescent emissions. For Al3+, excitation at 370 nm generated a strong emission at 480 nm, whereas for Zn2+, excitation at 320 nm led to a new small broad emission at 560 nm. We established detection limits of 2.22 × 10−6 M for Al3+ and 1.62 × 10−5 M for Zn2+; their binding stoichiometry was found to be 1:1 for Al3+ and 2:1 for Zn2+, based on Job’s plot analysis. These results show that chemosensor 1 is a promising tool for detecting Al3+ and Zn2+.
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    Item type:Publication,
    Experimental and computational studies of Schiff bases derived from 4-aminoantipyrine as potential antibacterial and anticancer agents
    (Springer Science and Business Media LLC, 2025-01-31) ; ;
    Saskya E. Carrera Pacheco
    ;
    Cristina Rodríguez-Pólit
    ;
    Carlos Barba-Ostria
    Schiff bases are organic compounds recognized for their biological activities, including antiviral, antibacterial, antifungal, and anticancer properties, making them promising candidates in medicinal chemistry. In this studio, a series of Schiff bases derived from 4-aminoantipyrine and substituted cinnamaldehydes were evaluated in vitro against liver (HepG2) and thyroid (THJ29T) cancer cells, Gram-positive and Gram-negative multidrug-resistant bacteria, and biofilm-forming pathogens. Six compounds demonstrated anticancer activity, though some exhibited toxicity to non-tumor cells. Compounds showed notable anticancer potential, while also exhibited strong antibacterial effects, with being the most effective against multidrug-resistant bacteria strains. These Schiff bases also inhibit biofilm formation, suggesting their potential for treating biofilm-related infections. analyses of their ADME properties, global reactivity descriptors, and binding affinities corroborated these findings. The Schiff base has a strong binding affinity for DNA gyrase and vitamin D receptor, suggesting potential mechanisms for its antibacterial and anticancer activities.