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Applications of fluorescence correlation spectroscopy: Measurement of size–mass relationship of native and denatured schizophyllan
Author(s) -
Leng Xiaojing,
Starchev Konstantin,
Buffle Jacques
Publication year - 2001
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/1097-0282(20011005)59:4<290::aid-bip1025>3.0.co;2-u
Subject(s) - chemistry , fluorescence correlation spectroscopy , hydrodynamic radius , random coil , analytical chemistry (journal) , dynamic light scattering , radius of gyration , rhodamine 6g , persistence length , two dimensional nuclear magnetic resonance spectroscopy , fluorescence , fluorescence spectroscopy , macromolecule , crystallography , circular dichroism , chromatography , polymer , molecule , stereochemistry , nanotechnology , organic chemistry , nanoparticle , biochemistry , materials science , physics , quantum mechanics , copolymer
Diffusion dynamics of a polysaccharide, schizophyllan has been studied by fluorescence correlation spectroscopy (FCS). Several different sizes of nondenatured and denatured schizophyllan have been labeled with rhodamine 6G in borate buffer. The length of the nondenatured schizophyllan was calculated from FCS data by using the Broersma's relationship for rod‐like macromolecules. The obtained length was close to that obtained by atomic force microscopy (AFM) measurements. Denatured schizophyllan possesses a random coil conformation. Its hydrodynamic radius R h was measured by FCS. The relationship between R h and the molecular mass M has been studied and the scaling relationship R h ∼ M 0.59 has been obtained, which is in agreement with the random coil model with excluded volume effect. The persistence length q denat of the denatured schizophyllan was determined by Hearst's relationship, to be equal to 5.16 ± 0.75 (nm). The work demonstrates the utility of FCS method for dynamics investigations of biopolymers especially in diluted regime (concentration lower than 10 −8 M could be measured) where other techniques could not be used. © 2001 John Wiley & Sons, Inc. Biopolymers 59: 290–299, 2001