Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 111, Issue 29, Pages 8373-8378Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp070261w
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The release of double-stranded DNA from its interpolyelectrolyte complex with positively charged poly(allylamine hydrochloride) via exchange reaction with added polyanion, poly(sodium styrenesulfonate), is directly observed by fluorescence microscopy. It is shown that the pathways of DNA release depend essentially on the amount of added low-molecular-weight salt. At low salt content, the DNA release proceeds via the formation of an intermediate beads-on-string structure, whereas at high salt content the release goes directly from globule to coil states without any intermediate structures. The reasons for different character of DNA release are discussed.
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