Solvation dynamics of DCM in a polypeptide-surfactant aggregate: gelatin-sodium dodecyl sulfate

Halder, Arnab ; Sen, Pratik ; Burman, Anupam Das ; Bhattacharyya, Kankan (2004) Solvation dynamics of DCM in a polypeptide-surfactant aggregate: gelatin-sodium dodecyl sulfate Langmuir, 20 (3). pp. 653-657. ISSN 0743-7463

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Official URL: http://pubs.acs.org/doi/abs/10.1021/la035647m?prev...

Related URL: http://dx.doi.org/10.1021/la035647m

Abstract

Solvation dynamics of 4-(dicyanomethylidene)-2-[p-(dimethylamino)styryl]-6-methyl-4H-pyran (DCM) is studied in a polypeptide-surfactant aggregate consisting of gelatin and sodium dodecyl sulfate (SDS) in potassium dihydrogen phosphate (KP) buffer. The average solvation time τs in gelatin-SDS aggregate at 45°C is found to be 1780 ps, which is about 13 times slower than that in 15 mM SDS in KP buffer at the same temperature. The fluorescence anisotropy decay in gelatin-SDS aggregate is also different from that in SDS micelles in KP buffer. DCM displays negligible emission in the presence of gelatin in aqueous solution. Thus the solvation dynamics in the presence of gelatin and SDS is exclusively due to the probe (DCM) molecules at the gelatin-micelle interface. The slow solvation dynamics is ascribed to the restrictions imposed on the water molecules trapped between the polypeptide chain and micellar aggregates. The critical association concentration (cac) of SDS for gelatin is determined to be 0.5 ± 0.1 mM.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:5339
Deposited On:18 Oct 2010 08:48
Last Modified:23 Jan 2011 04:51

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