Carbohydrates are naturally occurring compounds that are biocompatible, biodegradable and offers good opportunities for chemical modifications. Also, it holds significant importance in numerous biological processes including immune response, growth regulation,...

Amphiphiles in action: self-assembled nanostructures for drug delivery and imaging.

The aim of the present study is to compare the synthesized dendritic architectures in terms of self-assembly and transport potential for hydrophobic guest molecules.

A new series of oligo-glycerol based amphiphiles have been synthesized for drug delivery.

Graphene oxide supported Cu (II) ligand complex (GO@AP/L‐Cu) has been synthesized and characterized by FT‐IR, Raman, PXRD, UV–Visible, TGA, XPS, FESEM, TEM, EDAX, Elemental mapping, BET, CHNS and AAS analysis. The complex has been found to be efficient and reusable heterogeneous catalyst for the N‐arylation and C‐H activation reactions, both the catalytic reactions were found to be simple, cleaner and give high yields (~ 90%) of product. The catalyst can be easily filtered out from the reaction mixture and reused up to four times without significant loss of catalytic activity. The reported method is economical and novel in the sense that aqueous medium was used for both the reactions and for the stability of the catalyst. All isolated organic products were fully characterized on the basis of their physical and spectral data.

Herein, we report on the synthesis of a new class of novel non-ionic amphiphiles using triglycerol as a core, which is further functionalized with hydrophilic units poly(ethylene glycol) monomethyl ether (M n : 350 and 550) and a pair of hydrophobic alkyl chains (C 18 or C 15 ) via chemo-enzymatic approach. Fluorescence measurements and dynamic light scattering studies showed that all of the synthesized amphiphilic systems spontaneously self-assemble in aqueous solution, which is further confirmed by the transmission electron microscopy. Encapsulation of hydrophobic moieties like Nile red and nimodipine was studied using ultraviolet-visible (UV-vis) and fluorescence spectrometer techniques. A cytotoxicity study of the amphiphiles using A549, HeLa, and MCF7 cell, which showed that all of the synthesized nanocarriers are well tolerated at the concentrations studied. The release profile of encapsulated Nile red in synthesized amphiphilic system was studied in the presence of the immobilized enzyme (Novozym 435).amphiphile, cytotoxicity, encapsulation, self-assembly 1 | INTRODUCTION Molecular self-assembly, the spontaneous process of forming ordered aggregates without external intervention is gaining attention by researchers from different disciplines because of its widespread applications. The phenomenon is derived mostly by various noncovalent interactions such as hydrophobic, ionic, π-π stacking, and electrostatic interaction adopting the minimal Gibbs free energy and thermodynamic stability. 1-4 The natural self-assembly phenomenon, for example, polypeptide chains folding into proteins or conformational changes of nucleic acids into their different functional forms etc, have inspired the scientific community to mimic the process using newly designed molecules. 5,6 Self-assembly of amphiphilic macromolecules provide a unique and newer opportunity for designing novel material for advanced applications in biomedicine and bionanotechnology. 7-11 Among the diverse and various promising applications of amphiphilic macromolecules, the area of drug delivery is challenging because of the limited aqueous-solubility and short circulation half-life of most clinically used drugs. [12][13][14] Carrier-mediated drug delivery not only can maximize the bioavailability but also allow targeting the active site in the body while minimizing the side effects.Amphiphiles can self-assemble into a variety of nano and microscale structures in the aqueous medium, where the majorly known 3-D structures include vesicles, micelles, and molecular gels. [15][16][17] Micelles vary in diameter in the range of 5 to 100 nm and may consist of spheres, discs, and wormlike assemblies, 18 whereas vesicles are found in hollow, spherical, and lamellar type morphologies within the diameter range of 20 nm to micrometer. 19 Since micelles formed by small molecules have simple synthesis, high loading capacity, and low toxicity, they may be able to target many cancer tissues and ensure the accumulation within the small vasculatures of tumors. 20,21 However, o...

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Palladium nanoparticles immobilized on Schiff base-functionalized graphene-oxide (GOÀ Pd) has been synthesized and characterized by FT-IR, Raman, PXRD, UV-Visible, TGA, XPS, FE-SEM, TEM, EDAX, Elemental mapping, BET, AAS and ICP MS analysis. The GOÀ Pd showed promising catalytic activity for the Suzuki-Miyaura, Hiyama and Heck-Mizoroki coupling reactions with higher yields (up to 95%). GOÀ Pd can be easily filtered out from the reaction mixture and reused up to six times without significant loss of catalytic activity. All of the synthetic products obtained were fully characterized from their spectral data.