摘要:
A liquid chromatography apparatus with stationary and mobile phase temperature controls suitable for polynucleotide separations by MIPC and DMIPC processes. The apparatus includes heater means with a temperature control system; a matched ion polynucleotide chromatography separation column having an inlet end; a coil of capillary tubing having an inlet end and an outlet end. The outlet end of the capillary tubing is connected with the inlet end of the separation column. The inlet end of the capillary tubing comprising means for receiving process liquid, the tubing having a length of from 6 to 400 cm having a linear tubing length of heating means. The separation column and the coil of capillary tubing are enclosed in the heater means. The capillary tubing preferably is PEEK or titanium. The heater means can be an air batch oven. Preferably, it is a heat-conducting block having a first heat transfer surface, a separation column receptacle, and a capillary coil receptacle. A separation column is positioned within the separation column receptacle in heat conducting relationship with an inner wall thereof. A coil of capillary tubing is positioned in the capillary coil receptacle, the outer extremities of the coil being in heat conducting relationship with an inner wall of the capillary coil receptacle. Optimally, the heating means is a Peltier heating and cooling unit in heat conducting relationship with a heat transfer surface of the heating block.
摘要:
A liquid chromatography apparatus with stationary and mobile phase temperature controls suitable for polynucleotide separations by MIPC and DMIPC processes. The apparatus includes heater means with a temperature control system; a matched ion polynucleotide chromatography separation column having an inlet end; a coil of capillary tubing having an inlet end and an outlet end. The outlet end of the capillary tubing is connected with the inlet end of the separation column. The inlet end of the capillary tubing comprising means for receiving process liquid, the tubing having a length of from 6 to 400 cm having a linear tubing length of heating means. The separation column and the coil of capillary tubing are enclosed in the heater means. The capillary tubing preferably is PEEK or titanium. The heater means can be an air batch oven. Preferably, it is a heat-conducting block having a first heat transfer surface, a separation column receptacle, and a capillary coil receptacle. A separation column is positioned within the separation column receptacle in heat conducting relationship with an inner wall thereof. A coil of capillary tubing is positioned in the capillary coil receptacle, the outer extremities of the coil being in heat conducting relationship with an inner wall of the capillary coil receptacle. Optimally, the heating means is a Peltier heating and cooling unit in heat conducting relationship with a heat transfer surface of the heating block.
摘要:
A Matched Ion Polynucleotide Chromatography method and system for size-based segregation of a mixture of RNA molecules. The method includes applying the mixture to a polymeric separation medium having non-polar surfaces and eluting the RNA molecules with a mobile phase which includes counterion reagent and an organic component. The preferred surfaces are characterized by being substantially free from multivalent cations which are free to interfere with RNA segregation. The elution is preferably performed at a temperature sufficient to denature the RNA. The method can be used in segregating RNA molecules having lengths in the range of about 100 to 20,000 nucleotides. Improved segregation is obtained using a chromatography column having an ID greater than about 5 mm. Examples of separation media include beads and monolithic columns.
摘要:
Non-polar polymeric separation media, such as beads or monoliths, are suitable for chromatographic separation of mixtures of polynucleotides when the surfaces of the media are unsubstituted or substituted with a hydrocarbon group having from one to 1,000,000 carbons and when the surfaces are substantially free from mutivalent cation contamination. The polymeric media provide efficient separation of polynucleotides using Matched Ion Polynucleolide Chromatography. Methods for maintaining and storing the polymeric media include treatment with multivalent cation binding agents.
摘要:
A method and apparatus for representing double stranded nucleic acid fragments which have been separated by a chromatographic process as an array of bands which can be accurately quantified, optimized and stored. Using, for example, a Matched Ion Polynucleotide Chromatography (MIPC) process, an analog output from a UV detector is digitized and input to a computer. The digitized signal is converted to a linear array of bands which may be displayed on a video display terminal. The intensity and/or color of a band may correlate to the amount of double stranded nucleic acid in the respective fraction or the respective double stranded nucleic acid fragment above a user selected threshold level at a corresponding point in the digitized signal. The calculated base pair length, concentration, and retention time of each band in the array of bands may be displayed in alphanumeric form.
摘要:
Mixtures of dsDNA fragments are separated by Matched Ion Polynucleotide Chromatography (MIPC) using an isocratic mobile phase to elute polynucleic acid from an MIPC column. The use of isocratic elution conditions provides a marked improvement in the separation of dsDNA fragments compared to gradient elution conditions. Isocratic elution can also be used to effect an improved separation of heteroduplex and homoduplex mixtures when the chromatography is performed under partially denaturing conditions. In addition, dsDNA fragments are bound to the stationary phase under isocratic conditions until a solvent concentration is reached which releases fragments of a particular base pair length range. This separation process is different from the equilibrium partitioning process observed under gradient elution conditions.
摘要:
Nonporous beads having an average diameter of about 0.5-100 microns are suitable for chromatographic separation of mixtures of polynucleotides when the beads comprise a nonporous particle which are coated with a polymer or which have substantially all surface substrate groups endcapped with a non-polar hydrocarbon or substituted hydrocarbon group. The beads provide efficient separation of polynucleotides using Matched Ion Polynucleotide Chromatography.
摘要:
Nonporous beads having an average diameter of about 0.5-100 microns are suitable for chromatographic separation of mixtures of polynucleotides when the beads comprise a nonporous particle which are coated with a polymer or which have substantially all surface substrate groups endcapped with a non-polar hydrocarbon or substituted hydrocarbon group. The beads provide efficient separation of polynucleotides using Matched Ion Polynucleotide Chromatography.
摘要:
Non-polar polymeric separation media, such as beads or monoliths, are suitable for chromatographic separation of mixtures of polynucleotides when the surface of the media are unsubstituted or substituted with a hydrocarbon group having from one to 1,000,000 carbons and when the surfaces are substantially free from multivalent cation contamination. The polymeric media provide efficient separation of polynucleotides using Matched ion Polynucleotide Chromatography. Methods for maintaining and storing the polymeric media include treatment with multivalent cation binding agents.
摘要:
Non-polar polymeric separation media, such as beads or monoliths, are suitable for chromatographic separation of mixtures of polynucleotides when the surfaces of the media are unsubstituted or substituted with a hydrocarbon group having from one to 1,000,000 carbons and when the surfaces are substantially free from mutivalent cation contamination. The polymeric media provide efficient separation of polynucleotides using Matched Ion Polynucleotide Chromatography. Methods for maintaining and storing the polymeric media include treatment with multivalent cation binding agents.