The characterization of complexes is particularly critical for quality control and development of gene delivery systems. Here, the method of capillary zone electrophoresis （CZE） for the characterization of DNA and p...The characterization of complexes is particularly critical for quality control and development of gene delivery systems. Here, the method of capillary zone electrophoresis （CZE） for the characterization of DNA and polyoL-lysine （MW 28 500） or DNA and poly-L-lysine modified with polyethylene glycol （MW10 000） complexes at various charge ratios in phosphate buffer is described firstly. During the characterization, DNA complexes can be separated into various components with different charge-to-mass ratio, i.e, components with single physicochemical property. And also the size and zeta potential of complexes were characterized by using photon correlation spectroscopy. This method is useful to characterize various complexes formed by DNA and polycations, and has the potential to separate complexes into homogeneous component for better transfection efficiency in vitro and in vivo in future.展开更多
In this letter, the technique of laser self-mixing effect is employed for nano-particle size analysis. In contrast to the photon correlation spectroscopy （PCS） and photon cross correlation spectroscopy （PCCS）, the...In this letter, the technique of laser self-mixing effect is employed for nano-particle size analysis. In contrast to the photon correlation spectroscopy （PCS） and photon cross correlation spectroscopy （PCCS）, the main advantages of this technique are sensitive, compact, low-cost, and simple experimental setup etc. An improved Kaczmarz projection method is developed in the inversion problem to extract the particle size distribution. The experimental results prove that nano-particle size can be measured reasonably by using the self-mixing effect technique combined with the improved projection algorithm.展开更多
文摘The characterization of complexes is particularly critical for quality control and development of gene delivery systems. Here, the method of capillary zone electrophoresis （CZE） for the characterization of DNA and polyoL-lysine （MW 28 500） or DNA and poly-L-lysine modified with polyethylene glycol （MW10 000） complexes at various charge ratios in phosphate buffer is described firstly. During the characterization, DNA complexes can be separated into various components with different charge-to-mass ratio, i.e, components with single physicochemical property. And also the size and zeta potential of complexes were characterized by using photon correlation spectroscopy. This method is useful to characterize various complexes formed by DNA and polycations, and has the potential to separate complexes into homogeneous component for better transfection efficiency in vitro and in vivo in future.
基金supported by the Nano-Project of Shanghai Science and Technology Commission under Grant No.0452nm029.
文摘In this letter, the technique of laser self-mixing effect is employed for nano-particle size analysis. In contrast to the photon correlation spectroscopy （PCS） and photon cross correlation spectroscopy （PCCS）, the main advantages of this technique are sensitive, compact, low-cost, and simple experimental setup etc. An improved Kaczmarz projection method is developed in the inversion problem to extract the particle size distribution. The experimental results prove that nano-particle size can be measured reasonably by using the self-mixing effect technique combined with the improved projection algorithm.
