Aqueous Behaviour of Chitosan

Abstract

Chitosan, a versatile biopolymer, finds numerous applications in textile processing unit operations such as preparation, dyeing, printing, and finishing. However, the accessibility of this biopolymer by the textile material depends on the viscosity of its solution which in turn is a function of its molecular weight. In this work, therefore, the effect of molecular weight, storage life, presence of electrolyte, and particle size of chitosan on its viscosity was investigated. Chitosan of different molecular weights was synthesized by nitrous acid hydrolysis of parent chitosan solution. The synthesized low molecular weight products were analysed by FTIR spectroscopy. Chitosan of nanoconfiguration was prepared by Ionotropic gelation method and characterized by particle size analyzer. The viscosity of different chitosan solutions was determined using Ubbelohde capillary viscometer. As an extension to this study, the chelation property of chitosan was also evaluated.

The Effect of β-Glycerophosphate Crosslinking on Chitosan Cytotoxicity and Properties of Hydrogels for Vaginal Application

“…A decrease in mechanical properties may be associated with higher ionic strength resulted from introduction higher amount of β-GP ions in formulation F4. This observation is consistent with literature wherein the addition of ions was one of the crucial parameters responsible for loosening the CS hydrogels' structure and decreasing the viscosity [37,43].…”

“…The observed ability to gradually recover It was found that ion crosslinked CS formulations F3 and F4 displayed lower viscosities compared with unmodified CS hydrogels (Table 3). A significant drop (almost 2-fold) in viscosity of hydrogel F4 (in comparison to F2) was probably affected by greater ionic strength resultant from addition of higher amount of β-GP [37]. The rheological behavior was found to be comparable between the samples investigated at room and body temperature.…”

Fabrication and characterization porous carbon rod-shaped from almond natural fibers for environmental applications

“…The powdered sample was finally sieved to obtain a sample with a particle size of 30-100 mm and was stored. To prepare chitosan solution, 1 g of chitosan (medium molecular weight) was dissolved in 1.5 ml acetic acid (96%) and 10 ml distillated water at temperature 30 C [17]. The mixture was stirred for 24 h to reach a homogeneous mixture.…”

Viscous Degradation of Acidic Chitosan Solutions and its Ionic Probe Study

“…[3]. Впоследствии его объясняли либо кислотным гидролизом гликозидных связей (деструкцией) [2,[4][5][6][7][8], либо другими причинами: медленным образовани-ем внутримолекулярных водородных связей с уплотнением клубков [9,10], компактизацией макромолекул хитозана [11], снижением степе-ни структурированности растворов [12], пере-стройкой надмолекулярной структуры раствора [13], процессами структурной перестройки [14,15], агрегации [16], биодеградации [17]. Одна-ко авторы работы [2] замечают, что изменение конформаций макромолекул и степени структу-рирования не может приводить к практически полному разжижению концентрированных рас-творов полимера при длительном хранении.…”