Patent Application
20080312104
1. Field of the Invention
The present invention relates to a preparation chip for extracting DNA from a sample solution as a biological material for conducting a gene test and to a preparation chip system using the same.
2. Description of the Related Art
To test a living body with a DNA sequencer, a DNA chip, and the like at a gene level, it is necessary to extract DNA from a biological material. A method is known, to separate a desired analyte from a fluid sample, of using a chamber, a storage chamber, and a cartridge obtained by assembling a detecting process region or the like on a fine fluid chip and leading the flow, particularly, the diversion of a sample solution, a reagent, a waste solution, and the like by using a diverter including a capillary or a hydrophobic film. Such a method is described in, for example, Japanese Patent Application National Publication Laid-Open No. 2001-527220.
In the conventional technique, to divert a waste solution, a diverter for passing a solution simply in the case where limit back pressure is generated is used. In the case of applying the conventional technique to the case where the number of branches is large such as a case of sequentially passing a plurality of regents, a plurality of limit back pressures have to be set and it is difficult to reliably pass the regents.
An object of the present invention is to provide a biological material preparation chip and a preparation chip system with a simpler configuration, realizing reliable flow of solutions, with improved reliability, and realizing prompt processing also in the case where a plurality of reagents have to be fed like in a preparation of extracting DNA from a sample solution.
To solve the problem of the conventional technique, the present invention provides a preparation chip system, in order to extract DNA from a biological material, for injecting a sample solution into a preparation chip, mixing the sample solution with a dissolving solution to expose DNA, passing the dissolved sample solution through a carrier part to adsorb the DNA on the surface of a carrier, passing a cleaning solution through the carrier part to wash away the sample solution remaining on the surface, passing an eluting solution through the carrier part to elute the adsorbed DNA, and taking out the eluting solution containing the DNA. The system includes: a sample chamber in which the sample is injected; a dissolving solution chamber containing the dissolving solution; a cleaning solution chamber containing the cleaning solution; an eluting solution chamber containing the eluting solution; a mixing passage connected to the sample chamber and the dissolving solution chamber and mixing the sample and the dissolving solution with each other; a carrier part connected to the mixing passage; a waste chamber connected to the carrier part via a holding passage; a collection chamber connected to the waste chamber and holding the eluting solution passed through the carrier part; and a plurality of resistive materials forming a passage resistor disposed in a first passage connecting the cleaning solution chamber with both the mixing passage and the carrier part. The eluting solution is passed through the carrier part by pressure from a pressure source.
According to the invention, the passage for passing the cleaning solution and the eluting solution is ramified while a passage resistor being set by using a plurality of resistive materials. Therefore, also in the case where a plurality of reagents have to be fed like in a preparation of extracting DNA from a sample solution, a simpler configuration, reliable flow of the solutions, and improved reliability can be realized.
Referring to
A preparation chip 100 has a sample chamber 110 in which a sample containing a biological material is injected, a dissolving solution chamber 111 containing a dissolving solution, cleaning solution chambers 112 and 113 containing cleaning solution, an eluting solution chamber 114 containing an eluting solution, a passage 120 for mixing the sample with the eluting solution, a carrier part 130 made of a plurality of carriers as substances for adsorbing DNA in the sample thereon and effectively performing chemical/physical operation of a small amount of an element and compound, a holding passage 121 for temporarily holding the sample, the dissolving solution, the cleaning solution, and the eluting solution passed through the carrier part 130, a waste chamber 115 for holding the sample, the dissolving solution, and the cleaning solution passed through the carrier part 130, and a collection chamber 116 for holding the eluting solution passed through the carrier part 130.
The chambers 110 to 116 are connected to ports 190 to 196 via port passages 180 to 186, respectively. Further, between the both of the mixing passage 120 and the carrier part 130 and the group consisting of the first and second cleaning solution chambers 112, 113 and the eluting solution chamber 114, resistance parts 160 to 164 made from a plurality of resistive materials 169 are provided, with connection passages being interposed among them.
The resistance part 162 is disposed in a first passage connecting the first cleaning solution chamber 112 with both the mixing passage 120 and the carrier part 130. The resistance part 163 is disposed in a second passage connecting the carrier part side of the first passage and the second cleaning solution chamber 113.
The resistance part 164 is disposed between the eluting solution chamber 114 and the carrier part 130, the resistance part 161 is disposed between the resistance parts 163, 164 and the carrier part 130, and the resistance part 160 is disposed between the resistance parts 161, 162 and the both of the passage 120 and the carrier part 130. A suitable carrier has the surface made of a glass material such as glass beads, glass wool, glass sintered body, porous glass, since such material efficiently adsorbs DNA.
The magnitude relations of the passage resistances between the passage 120, the carrier part 130, and the resistance parts 160 to 164 are as follows.
Passage 120<carrier part 130<resistance part 160
Resistance part 160<resistance part 161
Resistance part 160<resistance part 162
Resistance part 160+resistance part 161<resistance part 163
Resistance part 160+resistance part 161<resistance part 164
As the resistive material, it is preferable to use the same material as that of the carrier. Accordingly, to set the passage resistance to a proper value, it is sufficient to set the number of carriers. As compared with the case of setting passage resistance and the like by a single resistive material, not only the value itself but variations of the quality and the like are smaller. Thus, it is easier to assure reliability.
Outline of the preparing procedure will be described with reference to
First, a sample solution is injected into the chip and mixed with a dissolving solution in the chip to dissolve the biological material and expose DNA (dissolving process). Next, the dissolved sample solution is passed through the carrier part where the DNA is adsorbed on the surface of the carrier (adsorbing process).
A cleaning solution is passed through the carrier part to wash away the sample solution remaining on the surface of the carrier (cleaning process). An eluting solution is passed through the carrier part to elute the DNA adsorbed on the surface of the carrier (eluting process). Finally, the eluting solution containing the DNA is taken out.
The procedure of performing the above-described preparing process in the chip will be described.
In the initial state, reagents are contained in the chip. Specifically, the dissolving solution chamber 111 is filled with the dissolving solution, the cleaning solution chamber 112 is filled with a cleaning solution, the cleaning solution chamber 113 is filled with another cleaning solution, and the eluting solution chamber 114 is filled with the eluting solution.
A sample solution is injected from the port 190 into the chip in the initial state to fill the sample chamber 110. At this time, the ports 191, 192, 193, and 194 are closed. At least one of the ports 195 and 196 is open to inject the sample solution from the port 190.
The sample solution in the sample chamber 110 and the dissolving solution in the dissolving solution chamber 111 are fed to the passage 120 where they are mixed. In this instance, the ports 192, 193, and 194 are closed, at least one of the ports 195 and 196 is opened, and air is injected from the ports 190 and 191. As necessary, the mixture of the sample and the dissolving solution may be heated in the chip.
The mixture of the sample solution and the eluting solution is fed from the passage 120 via the carrier part 130 to the passage 121. In this instance, the ports 192, 193, and 194 are closed, at least one of the port 195 and 196 is opened, and air is injected from the port 190 or 191. Since the passage resistance in the carrier part 130 is lower than that in the resistance part 160, the mixture from the passage 120 flows to the carrier part 130.
In the case of passing the mixture in the passage 121 via the carrier part 130 to the passage 120, the ports 192, 193, and 194 are closed, at least one of the ports 190 and 191 is opened, and air is injected from the port 195 or 196. Since the passage resistance in the passage 120 is lower than that in the resistance part 160, the mixture from the carrier part 130 flows to the passage 120. When the mixture passes through the carrier part 130, DNA in the mixture is adsorbed on the surface of the carrier. In the case of passing the mixture in the passage 121 to the waste chamber 115, the ports 192, 193, 194, and 196 are closed, the port 195 is opened, and air is injected from the port 190 or 191. In such a manner, the mixture is held in the waste chamber 115.
The cleaning solution is once fed from the cleaning solution chamber 112 to the passage 120. The ports 193, 194, 195, and 196 are closed, at least one of the ports 190 and 191 is opened, and air is injected from the port 192. Since the passage resistance in the resistance part 160 is lower than that in the resistance part 161, the cleaning solution from the cleaning solution chamber 112 flows to the resistance part 160. Since the passage resistance in the passage 120 is lower than that in the carrier part 130, the cleaning solution from the resistance part 160 flows to the passage 120. The cleaning solution is temporarily held in the passage 120.
The cleaning solution is fed from the passage 120 via the carrier part 130 to the passage 121. The ports 192, 193, and 194 are closed, at least one of the ports 195 and 196 is opened, and air is injected from the port 190 or 191. Since the number of carriers in the carrier part 130 is smaller than that in the resistance part 160 and the passage resistance is lower, the cleaning solution from the passage 120 flows to the carrier part 130. In the case of passing the cleaning solution in the passage 121 via the carrier part 130 to the passage 120, the ports 192, 193, and 194 are closed, at least one of the ports 190 and 191 is opened, and air is injected from the port 195 or 196. Since passage resistance in the passage 120 is lower than that in the resistance part 160, the cleaning solution from the carrier part 130 flows to the passage 120.
When the cleaning solution passes through the carrier part 130, components other than the DNA on the carrier surface are washed out. In the case of passing the cleaning solution in the passage 121 to the waste chamber 115, the ports 192, 193, 194 and 196 are closed, the port 195 is opened, and air is injected from the port 190 or 191. In such a manner, following the mixture, the cleaning solution is held in the waste chamber 115.
The cleaning solution is once fed from the cleaning solution chamber 113 to the passage 120. The ports 192, 194, 195, and 196 are closed, at least one of the ports 190 and 191 is opened, and air is injected from the port 193. Since the passage resistance in the resistance part 161 is lower than that in the resistance part 164, the cleaning solution from the cleaning solution chamber 113 flows to the resistance part 161.
Since the passage resistance in the resistance part 160 is lower than that in the resistance part 162, the cleaning solution from the resistance part 161 flows to the resistance part 160. Since the passage resistance in the passage 120 is lower than that in the carrier part 130, the cleaning solution from the resistance part 160 flows to the passage 120. The cleaning solution is temporarily held in the passage 120.
The cleaning solution is fed from the passage 120 via the carrier part 130 to the passage 121. The ports 192, 193, and 194 are closed, at least one of the ports 195 and 196 is opened, and air is injected from the port 190 or 191. Since the passage resistance in the carrier part 130 is lower than that in the resistance part 160, the cleaning solution from the passage 120 flows to the carrier part 130.
In the case of passing the cleaning solution in the passage 121 via the carrier part 130 to the passage 120, the ports 192, 193, and 194 are closed, at least one of the ports 190 and 191 is opened, and air is injected from the port 195 or 196. Since passage resistance in the passage 120 is lower than that in the resistance part 160, the cleaning solution from the carrier part 130 flows to the passage 120. When the cleaning solution passes through the carrier part 130, the components other than DNA on the carrier surface are further washed.
In the case of passing the cleaning solution in the passage 121 to the waste chamber 115, the ports 192, 193, 194, and 196 are closed, the port 195 is opened, and air is injected from the port 190 or 191. Following the mixture and the cleaning solution, the cleaning solution is held in the waste chamber 115.
The eluting solution is once fed from the eluting solution chamber 114 to the passage 120. The ports 192, 193, 195, and 196 are closed, at least one of the ports 190 and 191 is opened, and air is injected from the port 194. Since the passage resistance in the resistance part 161 is lower than that in the resistance part 163, the eluting solution from the eluting solution chamber 114 flows to the resistance part 161. Since the passage resistance in the resistance part 160 is lower than that in the resistance part 162, the eluting solution from the resistance part 161 flows to the resistance part 160.
Further, since the passage resistance in the passage 120 is lower than that in the carrier part 130, the eluting solution from the resistance part 160 flows to the passage 120. The eluting solution is temporarily held in the passage 120.
The eluting solution is fed from the passage 120 via the carrier part 130 to the passage 121. The ports 192, 193, and 194 are closed, at least one of the ports 195 and 196 is opened, and air is injected from the port 190 or 191. Since the passage resistance in the carrier part 130 is lower than that in the resistance part 160, the eluting solution from the passage 120 flows to the carrier part 130. In the case of passing the eluting solution in the passage 121 via the carrier part 130 to the passage 120, the ports 192, 193, and 194 are closed, at least one of the ports 190 and 191 is opened, and air is injected from the port 195 or 196. Since passage resistance in the passage 120 is lower than that in the resistance part 160, the eluting solution from the carrier part 130 flows to the passage 120. When the eluting solution passes through the carrier part 130, the DNA is eluted from the carrier surface and is retained in the eluting solution.
In the case of passing the eluting solution in the passage 121 to the collection chamber 116, the ports 192, 193, 194 and 195 are closed, the port 196 is opened, and air is injected from the port 190 or 191. In such a manner, the eluting solution retaining the DNA is held in the collection chamber 116.
Finally, the eluting solution held in the collection chamber 116 is taken out from the port 196, and the preparation is finished. The eluting solution retaining the DNA after the preparation is amplified as necessary and used for a test of a living body at a gene level using a DNA sequencer, a DNA chip, and the like.
As described above, the resistance parts 160 to 164 are disposed between the both of the passage 120 and the carrier part 130 and the group consisting of the cleaning solution chambers 112, 113 and the eluting solution chamber 114, and the magnitude relations of the passage resistances between the passage 120, the carrier part 130, and the resistance parts 160 to 164 can be set according to the number of carriers. Therefore, it is easy to dispose the components in such a state that setting of the passage resistance is flexible.
Also in the case of changing the passage resistance in accordance with fluid properties, the passage resistance can be set by adjusting the number of resistive materials. Further, by changing the arrangement of the resistive materials, the flow direction control can be changed without forming a new chip.
A preparation chip system (apparatus) of
The preparation chip apparatus can extract DNA from a biological material in order to conduct a gene test. A preparation chip is inserted from the chip receiving window 201.
In the preparation chip, regents are filled, and a sample containing a biological material is injected. The preparation chip is carried by the movement stage 203 to the preparation stage 204. In the preparation stage 204, the sample solution containing the biological material is mixed with the dissolving solution to dissolve the biological material and expose DNA, in the preparation chip.
The dissolved sample solution is fed through the carrier part to adsorb the DNA on the carrier surface. The cleaning solution is passed through the carrier part to wash away the sample solution remaining on the carrier surface. The eluting solution is passed through the carrier part to elute the DNA adsorbed on the carrier surface.
The preparation process is performed automatically in the preparation chip apparatus, and the preparation chip is carried by the movement stage 203 to the chip receiving window 201 and is taken out. It is sufficient to load the preparation chip in the preparation chip apparatus and it is unnecessary to accurately control the amount of a solution passed.
