Cationic cellulose hydrogels: kinetics of the cross-linking process and characterization as pH-/ion-sensitive drug delivery systems

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

“…In the majority of cases, Na-CMC-based hydrogels are obtained through chemical cross-linking as a result of reaction with bifunctional cross-linking agents (for example: epichlorohydrin (Chang et al 2010), diepoxy (Rodriguez et al 2003;Kono et al 2013), dicarboxylic acid (Gorgieva and Kokol 2011;Akar et al 2012), aldehydes (Patenaude and Hoare 2012) and polyethylene glycol (Kono 2014). Also, the synthesis of multi-component hydrogels based on carboxymethyl cellulose have been reported (Maswal et al 2015).…”

Effect of Cellulose Nanocrystals Content and pH on Swelling Behaviour of Gelatin Based Hydrogel

“…The environment sensitive hydrogels are also called 'smart' hydrogels. The physical stimuli include temperature (Jagadeeshbabu et al 2011;Zhang et al 2009), electric fields ( Li et al 2004;Murdan 2003), light (Qiu & Park 2012), pressure (Qiu & Park 2012) and magnetic fields (Liu et al 2006;Paulino et al 2012), while the chemical stimuli include pH ( Frutos et al 2010;Karlsson & Gatenholm 1999) and ions (Rodrı́guez et al 2003). A number of studies had focused to broaden the applications of these kind of hydrogel in various field (Lindblad et al 2007;Wu et al 2008), including controlled drug delivery , tissue engineering (Hou et al 2010), gene transfection (Gojgini et al 2011) and sensors (Frisk et al 2007).…”

Synthetic Approaches to Flexible Fluorescent Conjugated Polymers

“…To accomplish this, it was hypothesized that if the aryl halides are relatively inactive (i.e., electronically deactivated aryl bromides) under modified Sonogashira reaction conditions with high copper content, the alkyne homocoupling will be predominant with a minor incorporation of Sonogashira reaction product. [30][31] This concept is the opposite of PPE synthesis, in which the cross coupling between alkynes and aryl halides is predominant, with minor incorporation of homocoupling products.…”

“…Photon absorption leads to the excitation of an electron from the valence band to the conduction band, forming an exciton, i.e., an electrostatically bound electronhole pair. 30 The migration of this exciton species along the conjugated backbone forms the basis of the use of CPs in photovoltaics and as fluorescence sensors. Exciton deactivation through radiative processes and non-radiative relaxation then returns the electron back to the ground state with or without the emission of a photon.…”

“…There is no apparent correlation between the proportion of flexible linker and the measured degree of cell emerging use in the design of controlled-release drug delivery systems. 30 Cationic oligo pphenyleneethynylenes (OPEs) with short conjugated segment lengths (up to n = 7) have been shown to exhibit unique self-assembly properties upon complexation with CMC. Changes in ionic and hydrophobic interactions of the OPEs upon CMC complexation contributed to dramatic shifts in absorbance and fluorescence maxima due to increased planarization of the phenyleneethynylene backbone.…”