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Related Concept Videos

Urea Cycle01:23

Urea Cycle

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The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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Indirect-acting cholinergic agonists, or anticholinesterases, enhance the body's cholinergic activity by inhibiting acetylcholine's breakdown. They are categorized as reversible or irreversible agents based on their mechanism of action. They are further classified into short-acting, intermediate-acting, and long-acting agents based on their duration of action.
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Direct-acting cholinergic agonists, such as synthetic choline esters and naturally occurring alkaloids, exert their effects by enhancing the actions of acetylcholine and stimulating the parasympathetic nervous system. Synthetic choline esters share structural similarities with acetylcholine. For example, they have a positively charged quaternary ammonium or onium group, contributing to their hydrophilic characteristics. As a result, they are poorly absorbed in the body through oral...
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Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method
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Kinetic study on urea uptake with chitosan based sorbent materials.

Chen Xue1, Lee D Wilson1

  • 1Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada.

Carbohydrate Polymers
|October 11, 2015
PubMed
Summary

This study shows that cross-linked chitosan materials exhibit enhanced urea uptake and adsorption capacity compared to pristine chitosan. These findings support the development of advanced chitosan sorbents for effective urea removal in aquatic environments.

Keywords:
AdsorptionChitosan–copper complexChitosan–glutaraldehyde polymerOne-pot methodUptake kineticsUrea

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Chemical Engineering

Background:

  • Urea contamination in aquatic environments poses ecological risks.
  • Chitosan, a biopolymer, shows potential for pollutant adsorption.
  • Optimizing chitosan structure is key to enhancing its adsorption capabilities.

Purpose of the Study:

  • To investigate the kinetic uptake of urea using various chitosan-based sorbents.
  • To evaluate the impact of cross-linking and metal complexation on urea adsorption.
  • To determine the optimal chitosan material for urea removal.

Main Methods:

  • Kinetic uptake studies of urea with pristine chitosan, glutaraldehyde cross-linked chitosan (C-1, C-2), and a Cu(II) complex of cross-linked chitosan (C-3).
  • Analysis of kinetic data using pseudo-first order (PFO) and pseudo-second-order (PSO) models.
  • Characterization of sorbent properties using scanning electron microscopy (SEM).

Main Results:

  • The pseudo-first order (PFO) model best described the urea uptake kinetics for all tested sorbents.
  • Urea uptake rate increased with higher glutaraldehyde content and Cu(II) complexation (HMW chitosan < C-1 < C-2 ≈ C-3).
  • Sorption capacity (qe) followed the order: HMW chitosan (48.1) ≈ C-1 (44.7) < C-2 (51.3) < C-3 (66.4 mg/g), with cross-linked materials showing superior performance.

Conclusions:

  • Cross-linked chitosan sorbents demonstrate significantly improved urea uptake rates and capacities compared to pristine chitosan.
  • Surface accessibility and pore structure modifications in cross-linked chitosan enhance urea adsorption.
  • Rational design of chitosan-based materials offers a promising strategy for controlled urea removal in aquatic systems.