Colorimetric Detection of Copper in Water Samples Using Dopamine Dithiocarbamate-Functionalized Au Nanoparticles

This paper describes the sensing application of water-dispersible dopamine dithiocarbamate decorated gold nanoparticles (DDTC-Au NPs) as sensors for the colorimetric detection of Cu²⁺ ions in water samples. Dopamine dithiocarbamate (DDTC) molecules were successfully attached on the surfaces of Au NPs and were characterized by using UV-visible, FT-IR, proton NMR, TEM, and DLS (dynamic light scattering). The color of DDTC-Au NPs was changed from purple to blue by the addition of Cu²⁺ ions at pH 9.0 by using Tris-tricine buffer. These changes were measured by UV-visible spectrometry and DLS. The method was linear in the range of 1–10 mM with correlation coefficient (<i>R</i>²) 0.999. As a result, the present approach allows the detection of Cu²⁺ ions at 14.9 × 10^–6 M. DDTC-Au NPs were effectively used as colorimetric sensors for the detection of Cu²⁺ ions in real samples (tap water)

Multifunctional ionic hydrogel based transdermal delivery of 5-fluorouracil for the breast cancer treatment

Transdermal drug delivery systems (TDDS) are a promising and innovative approach for breast cancer treatment, offering advantages such as non-invasiveness, potential for localized and prolonged drug delivery while minimizing systemic side effects through avoiding first-pass metabolism. Utilizing the distinctive characteristics of hydrogels, such as their biocompatibility, versatility, and higher drug loading capabilities, in the present work we prepared ionic hydrogels through synergistic interaction between ionic liquids (ILs), Choline Alanine ([Cho][Ala]) and Choline Proline ([Cho][Pro]) with oleic acid (OA). ILs used in the study are biocompatible and enhance the solubility of 5-Fluorouracil (5-FU), whereas OA is a known chemical penetration enhancer. Concentration dependent (OA) change in morphological aggregates, i.e. from cylindrical micelles to worm-like micelles to hydrogels was formed with both ILs and were characterized by SANS measurement, whereas the interactions involved were confirmed by FTIR spectroscopy. The hydrogels owes excellent mechanical properties, studied by rheology and its morphology through FE-SEM analysis. The in vitro skin permeation study revealed that both hydrogels penetrated 255 times ([Cho][Ala]) and 250 times ([Cho][Pro]) more as compared to PBS after 48 h. Those ionic hydrogels exhibited the capability to change the lipid and keratin arrangements within the skin layer, thereby enhancing the transdermal permeation of the 5-FU. Both ionic hydrogels exhibit excellent biocompatibility with normal cell lines (L-132 cells), as well as cancerous cell lines (MCF-7 cells), demonstrating over 92 % cell viability after 48 h in both cell lines. In vitro, cytotoxicity of the 5-FU loaded hydrogels was evaluated on MCF-7 and HeLa cell lines. These results indicate that the investigated biocompatible and non-toxic ionic hydrogels enable the transdermal delivery of hydrophilic drugs, making them a viable option for effectively treating breast cancer

Bio-ionic liquid based self healable and adhesive ionic hydrogel for the on-demand transdermal delivery of chemotherapeutic drug

The non-invasive nature and potential for sustained release makes transdermal drug administration an appealing treatment option for cancer therapy. However, the strong barrier of the stratum corneum (SC) poses a challenge for the penetration of hydrophilic chemotherapy drugs such as 5-Fluorouracil (5-FU). Due to their biocompatibility and capacity to increase drug solubility and permeability especially when paired with chemical enhancers, as in oleic acid (OA) used in this work, choline glycinate ([Cho][Gly]), has emerged as a potential class of substances for transdermal drug delivery. In this work, we examined the possibility of transdermal delivery of 5-FU for the treatment of breast cancer using an ionic hydrogel formulation consisting of [Cho][Gly] with OA. Small angle neutron scattering, rheological analysis, field emission scanning electron microscopy, and dynamic light scattering analysis were used to characterize the ionic hydrogel. Non-covalent interactions present between [Cho][Gly] and OA were investigated by computational simulations and FTIR spectroscopic methods. When subjected to the in vitro drug permeation using goat skin in Franz diffusion cell, the hydrogel demonstrated sustained release of 5-FU and effective permeability in the order: [Cho][Gly]-OA gel > [Cho][Gly] > PBS (control). The hydrogel also demonstrated 92% cell viability after 48 hours for the human keratinocyte cell line HaCaT cells as well as the normal human cell line L-132. Breast cancer cell lines MCF-7 and cervical cancer cell line HeLa were used to study in vitro cytotoxicity that was considerably affected by the 5-FU-loaded hydrogel. These results indicate the potential of the hydrogel as a transdermal drug delivery vehicle for the treatment of breast cancer