2014
DOI: 10.1021/jp4091816
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Entropy Contribution toward Micelle-Driven Deintercalation of Drug–DNA Complex

Abstract: Micelle-assisted "deintercalation" of intercalated drug/mutagen molecules from DNA is a well-established phenomenon; however, the driving energy cost for such a process is still not properly understood. In the present contribution, we have estimated the various energetic parameters for the SDS micelle-assisted deintercalation of a model DNA intercalator phenosafranine (PSF) using isothermal titration calorimetry (ITC) measurement. Both steady-state and picosecond-resolved fluorescence measurements provide stro… Show more

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Cited by 25 publications
(45 citation statements)
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References 45 publications
(94 reference statements)
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“…The large negative value of enthalpy shows that the migration of PIP to SAIL micelle involved the disruption of water structure at micellar surface which provides a more hydrophobic environment to PIP than its previous state. 3,32 This result is in good agreement with our spectroscopic results. The binding of PIP with ctDNA was also governed through the exothermic process (Δ H 0 = −71.80 kcal mol –1 ) with a large negative entropy contribution ( T Δ S 0 = −64.96 kcal mol –1 ).…”
Section: Resultssupporting
confidence: 92%
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“…The large negative value of enthalpy shows that the migration of PIP to SAIL micelle involved the disruption of water structure at micellar surface which provides a more hydrophobic environment to PIP than its previous state. 3,32 This result is in good agreement with our spectroscopic results. The binding of PIP with ctDNA was also governed through the exothermic process (Δ H 0 = −71.80 kcal mol –1 ) with a large negative entropy contribution ( T Δ S 0 = −64.96 kcal mol –1 ).…”
Section: Resultssupporting
confidence: 92%
“…A similar observation was previously reported in cases of PSF and SDS systems. 3 The overall absorption and emission spectroscopy result suggested that the microenvironment around the fluorophore molecule is different when compared to its native environment, and PIP is introduced to the micellar region of SAIL. The emission spectral change of PIP in the presence of SAIL was further utilized to determine the penetration of PIP in the SAIL micelle.…”
Section: Resultsmentioning
confidence: 99%
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“…Absorption and circular dichroism spectroscopy, and thermal denaturation studies have shown that the presence of SDS micelles induces the exclusion of intercalated mitoxantrone monomer from DNA and further their encapsulation in micelles [69]. This deintercalation process of intercalated drug molecules from DNA in the presence of surfactant micelles and their transfer inside of micelles was observed for different ligands [71,72,73,74,75,76]. Considering that amphiphilic molecules are present in real biological systems (i.e., phospholipids in the cell membranes, polyamines in nucleus, bile salts in the bile), this deintercalation process induced by micelles may have significant importance in biological processes [71].…”
Section: Uv-vis Absorption Studiesmentioning
confidence: 99%
“…Patra et al also reported that SDS micelles do not give the structure effect on ctDNA. 56 This result supported that we can use SDS micellar systems as the carrier of drugs for their safe delivery to the target, DNA.…”
Section: Resultsmentioning
confidence: 57%