Carrier, process for producing same, bioreactor, and chip for surface plasmon resonance analysis

Abstract

A carrier comprises a base plate, a polymeric film, which has been bound on a surface of the base plate, and a ligand, which has been bound with the polymeric film. The ligand has been bound with the polymeric film at a density falling within the range of 1.0×1016 pieces / mm3 to 3.3×1018 pieces / mm3. The carrier is produced with a process, comprising the steps of: causing the polymeric film to bind on the base plate, and causing the ligand to bind with the polymeric film, the step of causing the ligand to bind with the polymeric film being performed in an organic solvent.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to a carrier adapted for fixation of a physiologically active substance, and a process for producing the carrier. This invention also relates to a bioreactor comprising the carrier. This invention further relates to a chip for surface plasmon resonance analysis.[0003]2. Description of the Related Art[0004]Various analyses utilizing intermolecular interactions, such as immune reactions, have heretofore been performed in the fields of clinical examinations, and the like. Among others, several kinds of techniques, which do not require complicated operations and labeling substances and which are capable of detecting alterations in binding quantities of analyzed substances with a high sensitivity, have heretofore been used. Examples of the techniques described above include surface plasmon resonance (SPR) analysis techniques, quartz crystal oscillator microbalance (QCM) analysis techniques, and analysi...

AI Technical Summary

Benefits of technology

[0013]The primary object of the present invention is to provide a carrier, which is capable of reliably fixing a physiologically active substance.

[0053]Therefore, with the carrier in accordance with the present invention, the physiologically active substance is capable of being fixed by the ligand at multiple points. Accordingly, the physiologically active substance is capable of being fixed reliably.

[0058]Therefore, with the process for producing a carrier in accordance with the present invention, the ligand is capable of being bound at a high density with the polymeric film.

[0069]Therefore, with the chip for surface plasmon resonance analysis in accordance with the present invention, the fixation of each of the histidine units, which the physiologically active substance has, and the metal ion with each other and the fixation of the metal ion and the ligand with each other are capable of being performed at multiple points. Accordingly, the physiologically active substance is capable of being fixed reliably.

Problems solved by technology

However, with the amine coupling technique, since an arbitrary amino group on the surface of the protein is modified due to the fixation, it often occurs that the orientation of fixed protein is not capable of coinciding with a predetermined orientation, or it often occurs that the binding of the protein and the substrate with each other is obstructed by the position of the modified amino group, and that the activity of the protein becomes low.

Therefore, in the cases of a protein which undergoes denaturation under the conditions described above, the problems occur in that the fixation of the protein is not capable of being performed with the activity of the protein being kept.

However, since the combination of the His-tag protein and the NTA-Ni(II) complex with each other has been developed for the purposes of the purification with the affinity column, the binding between the His-tag protein and the NTA-Ni(II) complex is not sufficiently strong, and the problems with regard to dissociation equilibrium are encountered.

Therefore, the problems occur in that the His-tag protein having been fixed via the NTA-Ni(II) complex onto the analysis chip undergoes dissociation little by little from the analysis chip.

Accordingly, the combination of the His-tag protein and the NTA-Ni(II) complex with each other is not capable of being applied directly to the use applications for biosensors, and the like.

However, with the disclosed fixation techniques, the problems often occur, depending upon the oxidation rate and the kind of the oxidizing agent, in that deactivation of the protein arises.

However, with the attempt for improving the binding by the utilization of triNTA, it is not always possible to obtain practically sufficient fixation.

1096-1105, 2005, since the ligands close to each other are rigid and are not capable of moving flexibly, the problems are encountered in that the metal is not always capable of coordinating at multiple points with the protein, and in that actually it is not always possible to fix the protein reliably at multiple points.

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