Ionotrope Gele von Polyuronsäuren

Thiele, Heinrich; Andersen, Geert

doi:10.1007/bf01521087

Cited by 1 publication

(2 citation statements)

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“…However, alginate is known to interact strongly with divalent cations. 55 Even though the prior treatment of the cotton itself should remove such contaminations, it cannot be ruled out that traces are still present on the cotton or in the alginate. Adsorbed divalent cations would then mediate the adsorption of the anionic polyelectrolyte (see Figure S5 (Supporting Information) for the influence of CaCl 2 on the adsorption of alginate).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…As the CHEC does not bind much in a cooperative fashion, its amounts adsorbed are already relatively high for low concentrations (as evidenced by the low c 1/2 value), while for alginate (and to a lesser extent for MHEC) much higher polymer concentrations are required to see substantial adsorption. However, alginate is known to interact strongly with divalent cations . Even though the prior treatment of the cotton itself should remove such contaminations, it cannot be ruled out that traces are still present on the cotton or in the alginate.…”

Section: Resultsmentioning

confidence: 99%

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Adsorption Isotherms of Cellulose-Based Polymers onto Cotton Fibers Determined by Means of a Direct Method of Fluorescence Spectroscopy

et al. 2012

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We present a novel method for the measurement of polymer adsorption on fibers by employing fluorescently labeled polymers. The method itself can be used for any compound that either shows fluorescence or can be labeled with a fluorescent dye, which renders it ubiquitously applicable for adsorption studies. The main advantage of the method is that the choice of adsorbent is not limited to flat surfaces, thereby allowing the investigation of fibrous and porous systems. As an example of high interest for application we determined the adsorption isotherms of various polysaccharide-based polymers with different charges and different substituents on cotton fibers. These experiments show that the extent of adsorption depends not only on the charge conditions but also very much on the specific interactions between the polymer and fiber. For instance, the cationic hydroxyethyl cellulose can become bound to an extent similar to that of the anionic alginate, while the anionic carboxymethyl cellulose of similar charge density adsorbs much less under these conditions. This shows that the adsorption of polymers depends subtly on the details of the interaction between the polymer and fiber but can be determined with good precision with our direct fluorescence method.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%