JP4174630B2 - Autosampler - Google Patents

Autosampler Download PDF

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JP4174630B2
JP4174630B2 JP2004083021A JP2004083021A JP4174630B2 JP 4174630 B2 JP4174630 B2 JP 4174630B2 JP 2004083021 A JP2004083021 A JP 2004083021A JP 2004083021 A JP2004083021 A JP 2004083021A JP 4174630 B2 JP4174630 B2 JP 4174630B2
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needle
cleaning
sample
tank
cleaning liquid
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JP2005265808A (en
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愛明 前田
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Shimadzu Corp
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Shimadzu Corp
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本発明は、液体クロマトグラフに試料を導入するオートサンプラに関し、特に、オートサンプラにおいて試料を注入するニードルの洗浄手段に関する。   The present invention relates to an autosampler that introduces a sample into a liquid chromatograph, and more particularly to a means for cleaning a needle that injects a sample in the autosampler.

液体クロマトグラフ分析においてオートサンプラを用いた試料の導入は、まず、試料を収めた試料容器にニードルを挿入し、所定量の試料を吸引してニードル内およびニードルに連結されたサンプルループ等に保持する。次に、このニードルをインジェクションポートに移動し、保持していた試料を注入する。この過程で、前回注入した試料の残渣がニードルに付着しているとクロスコンタミネーションにより測定が妨害を受けるので、注入操作の前にニードルを洗浄する。洗浄は、特許文献1に従来技術として記載されているように、洗浄液を洗浄槽(洗浄ポートとも呼ばれる)に貯留して、この洗浄液にニードルを浸漬することにより行われる。洗浄槽内の洗浄液は1回の注入操作ごとにポンプにより自動的に入れ換えるように構成されるのが普通である。   In the introduction of a sample using an autosampler in liquid chromatographic analysis, a needle is first inserted into a sample container containing a sample, and a predetermined amount of sample is sucked and held in a sample loop or the like connected to the needle. To do. Next, the needle is moved to the injection port, and the held sample is injected. In this process, if the residue of the previously injected sample adheres to the needle, the measurement is disturbed by cross contamination, so the needle is washed before the injection operation. Cleaning is performed by storing a cleaning liquid in a cleaning tank (also referred to as a cleaning port) and immersing a needle in the cleaning liquid, as described in Patent Document 1 as a conventional technique. Generally, the cleaning liquid in the cleaning tank is configured to be automatically replaced by a pump for each injection operation.

従来のオートサンプラにおける洗浄槽の一例を図4に示す。
同図において、1は洗浄槽であって、頂部には洗浄されるニードル2を挿入するための開口11を有し、底部には洗浄液を導入するための導入口12が設けられる。また、上部の側面から横下方向に向けて洗浄液をオーバフローさせて排出させる排出口13が設けられ、これにより槽内の液面はほぼ一定レベルに保たれる。
洗浄槽1の材質としては、耐薬品性を考慮し、また導入口12や排出口13を密封溶接で取り付ける便宜上からステンレス鋼が用いられてきた。
An example of a cleaning tank in a conventional autosampler is shown in FIG.
In the figure, reference numeral 1 denotes a cleaning tank, which has an opening 11 for inserting a needle 2 to be cleaned at the top and an inlet 12 for introducing a cleaning liquid at the bottom. Further, a discharge port 13 is provided for allowing the cleaning liquid to overflow and discharge from the upper side surface in the laterally downward direction, whereby the liquid level in the tank is maintained at a substantially constant level.
As a material for the cleaning tank 1, stainless steel has been used in consideration of chemical resistance and for the convenience of attaching the inlet 12 and the outlet 13 by sealing welding.

この洗浄槽1によるニードル2の洗浄は特許文献1に詳述されているが、大略以下の如くである。
まず、バルブその他の流路部品を介して導入口12に接続されているポンプ(いずれも図示せず)を作動させて導入口12から洗浄液を洗浄槽1に送り込む。これにより洗浄槽1内の使用済み洗浄液は排出口13から排出され、槽内は新しい洗浄液に置換される。
次に、ニードル2を移動させて頂部の開口11から洗浄槽1内に挿入し、槽内の洗浄液に浸漬させることでニードル2の外側が洗浄される。ニードル2の内側は、別途に内側に洗浄液を流して洗浄されるが、本発明には直接関係しないので、内部の洗浄に関してはここでは省略する。
以後、前述の通り、ニードル2を移動させて、試料容器から試料を吸引し、インジェクションポートに注入する。
The cleaning of the needle 2 by the cleaning tank 1 is described in detail in Patent Document 1, but is generally as follows.
First, a pump (not shown) connected to the introduction port 12 is operated via a valve and other flow path components to feed the cleaning liquid from the introduction port 12 into the cleaning tank 1. As a result, the used cleaning liquid in the cleaning tank 1 is discharged from the discharge port 13, and the inside of the tank is replaced with a new cleaning liquid.
Next, the needle 2 is moved and inserted into the cleaning tank 1 through the opening 11 at the top, and the outside of the needle 2 is cleaned by being immersed in the cleaning liquid in the tank. The inside of the needle 2 is separately cleaned by flowing a cleaning liquid inside, but since it is not directly related to the present invention, the internal cleaning is omitted here.
Thereafter, as described above, the needle 2 is moved to suck the sample from the sample container and inject it into the injection port.

通常は上記のように、ニードル2の洗浄は溜め置いた洗浄液に浸漬するだけであるが、洗浄液を送り込むタイミングの設定次第で洗浄液を流しながら洗浄することも可能であり、その方が洗浄効果が高い。
また、上記のように試料を吸引する前にニードル2を洗浄することは欠かせないが、さらに試料を吸引した後で、ニードル2内部に試料を保持した状態で洗浄を行うこともある。これは、ニードル2を次にインジェクションポートに挿入する際に、インジェクションポート周辺を試料で汚染することを極力避けるためである。
Normally, as described above, the cleaning of the needle 2 is only performed by immersing it in the stored cleaning liquid. However, depending on the setting of the timing at which the cleaning liquid is fed, the cleaning can be performed while flowing the cleaning liquid. high.
In addition, it is indispensable to wash the needle 2 before sucking the sample as described above. However, after the sample is further sucked, the needle 2 may be washed with the sample held inside. This is to avoid contamination of the periphery of the injection port with the sample as much as possible when the needle 2 is next inserted into the injection port.

特開平9−127078号公報Japanese Patent Application Laid-Open No. 9-127078

図4に示すような洗浄槽1を用い、洗浄液を流しながら試料吸引後に洗浄を行う場合、1つの問題がある。それは、洗浄液が底から導入されるため、ニードル2の先端に下向きに開口する針穴に向かって洗浄液が流れることになり、ニードル2内の試料の一部が洗い流される恐れがあることである。
また、別の問題として、洗浄槽1内壁のステンレスに試料成分が吸着している場合、それが洗浄液に再溶解し、溶解した試料成分が次回のニードル洗浄時にニードル2に再吸着することでクロスコンタミネーションを招く可能性もある。
これらはいずれも分析結果の定量性、再現性に悪影響を及ぼす問題である。
本発明は、このような事情に鑑みてなされたものであり、上記問題を解決して、定量性、再現性を一段と高めたオートサンプラを提供することを目的とする。
When the cleaning tank 1 as shown in FIG. 4 is used and cleaning is performed after sample suction while flowing the cleaning liquid, there is one problem. That is, since the cleaning liquid is introduced from the bottom, the cleaning liquid flows toward the needle hole that opens downward at the tip of the needle 2, and there is a possibility that a part of the sample in the needle 2 may be washed away.
As another problem, when the sample component is adsorbed on the stainless steel on the inner wall of the cleaning tank 1, it is re-dissolved in the cleaning liquid, and the dissolved sample component is re-adsorbed on the needle 2 at the next needle cleaning. There is also the possibility of incurring contamination.
These are problems that adversely affect the quantitativeness and reproducibility of analysis results.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an autosampler that solves the above-described problems and further enhances quantitativeness and reproducibility.

本発明は、上記課題を解決するために、洗浄槽の側面に洗浄液の導入口を設け、送り込まれた洗浄液の流れがニードルの先端に直接当たらないようにした。また、洗浄槽の材質として、化学的に安定で試料成分を吸着することが少ないPEEK(ポリエーテル・エーテル・ケトン)樹脂を用いた。これにより、洗浄液を流しながら試料吸引後にニードルを洗浄する場合、ニードル先端から試料の一部が流失することが抑えられ、また、洗浄槽内壁への試料成分の吸着とニードルへの再吸着をさらに低減することができる。
In order to solve the above problems, the present invention is provided with a cleaning liquid inlet on the side surface of the cleaning tank so that the flow of the cleaning liquid fed does not directly hit the tip of the needle. In addition, a PEEK (polyether ether ketone) resin that is chemically stable and hardly adsorbs sample components was used as the material of the cleaning tank. As a result, when the needle is washed after the sample is aspirated while flowing the washing liquid, it is possible to prevent part of the sample from being washed away from the tip of the needle, and to further adsorb the sample component to the inner wall of the washing tank and to re-adsorb the needle. Can be reduced.

本発明によれば、洗浄槽内への洗浄液の送り込みを側面方向から行うようにしたので、洗浄液を流しながら試料吸引後にニードルを洗浄する場合に、ニードル先端から試料の一部が流失することを抑制でき、また、洗浄槽の材質を化学的に安定なPEEK(ポリエーテル・エーテル・ケトン)樹脂としたことにより、洗浄槽内壁への試料成分の吸着とニードルへの再吸着を防ぐことができ、分析結果の定量性と再現性を向上できる。   According to the present invention, since the cleaning liquid is fed into the cleaning tank from the side, when the needle is cleaned after the sample is sucked while flowing the cleaning liquid, a part of the sample is washed away from the tip of the needle. In addition, by using a chemically stable PEEK (polyether, ether, ketone) resin as the cleaning tank material, it is possible to prevent sample components from adsorbing to the inner wall of the cleaning tank and re-adsorbing to the needle. Quantitative and reproducible analysis results can be improved.

図1に本発明の一実施形態を示す。同図において、図4と同一の構成要素には同符号を付してあるので再度説明しない。3は洗浄液の供給源となる洗浄液槽、4は洗浄液を送液するポンプ、5は、ポンプ4から洗浄液を洗浄槽1に供給するための洗浄液流路であって、途中に図示しないバルブ等の流路部品が介在する場合もある。   FIG. 1 shows an embodiment of the present invention. In the figure, the same components as those in FIG. 4 are denoted by the same reference numerals and will not be described again. 3 is a cleaning liquid tank serving as a supply source of the cleaning liquid, 4 is a pump for feeding the cleaning liquid, and 5 is a cleaning liquid flow path for supplying the cleaning liquid from the pump 4 to the cleaning tank 1. There may be a case where a flow path component is interposed.

図1に示す実施形態の動作は基本的には図4に示した従来例と同じであって、洗浄液槽3からポンプ4により洗浄液が洗浄液流路5を経由して送液され、導入口12から洗浄槽1に送り込まれる。従来と異なる点は、導入口12が洗浄槽1の側面に設けられているため、洗浄液は洗浄を受けるニードル2の側面に当るように流れ、ニードル2の先端の針穴に直接当らないから、ニードル2の内部に保持された試料を洗い出す作用が抑えられる。導入口12の位置は、挿入されたニードル2の先端よりも少し上の高さが最も効果的であるが、導入口12の高さに対応してニードル2の挿入位置を設定することもできるから、導入口12の位置をさほど厳密に定める必要はない。   The operation of the embodiment shown in FIG. 1 is basically the same as the conventional example shown in FIG. 4, and the cleaning liquid is sent from the cleaning liquid tank 3 via the cleaning liquid flow path 5 by the pump 4, and the introduction port 12. To the washing tank 1. Since the introduction port 12 is provided on the side surface of the cleaning tank 1, the cleaning liquid flows so as to contact the side surface of the needle 2 to be cleaned and does not directly contact the needle hole at the tip of the needle 2. The action of washing the sample held inside the needle 2 is suppressed. The position of the introduction port 12 is most effective at a height slightly higher than the tip of the inserted needle 2, but the insertion position of the needle 2 can be set corresponding to the height of the introduction port 12. Therefore, it is not necessary to determine the position of the inlet 12 so strictly.

本実施形態では、洗浄槽1およびこれに付随する導入口12、排出口13等の材質としてPEEK(ポリエーテル・エーテル・ケトン)樹脂を用いて構成した。この樹脂は切削加工のほか成形加工も可能であり、導入口12、排出口13等を含めて一体構造に製作できる。PEEK樹脂の特性として、液体クロマトグラフで取り扱う多くの化学物質に対して安定で吸着性も少ないので、洗浄過程での吸着に起因するクロスコンタミネーションを抑えることができる。   In this embodiment, PEEK (polyether-ether-ketone) resin is used as the material for the cleaning tank 1 and the inlet 12 and outlet 13 associated therewith. This resin can be molded in addition to cutting, and can be manufactured in an integrated structure including the inlet 12, the outlet 13, and the like. As a characteristic of PEEK resin, since it is stable and less adsorbable with respect to many chemical substances handled in the liquid chromatograph, it is possible to suppress cross-contamination caused by adsorption in the washing process.

図2及び図3は、本発明になる洗浄槽1の変形例を示した。
図2は、ニードル2を洗浄槽1により深く挿入して洗浄可能範囲を大きくとるために、導入口12をやや傾けて設けた例である。このように構成したことにより、深く挿入されたニードル2の先端より少し上の部分に洗浄液の流れを当てやすくなる。
また、図3は他の変形例である洗浄槽1の横断面を示したものである。図に示すように、導入口12と排出口13を、洗浄槽1の中心線からオフセットさせて設けたものである。このように構成することで、洗浄液の流れはニードル2の針先に直接当たることがなく、しかも、洗浄液がスムーズに槽内を流れるので、液の置換が早くなり、洗浄効果が向上する。
2 and 3 show a modification of the cleaning tank 1 according to the present invention.
FIG. 2 is an example in which the introduction port 12 is provided with a slight inclination in order to insert the needle 2 deeper into the cleaning tank 1 to increase the washable range. With this configuration, the flow of the cleaning liquid can be easily applied to a portion slightly above the tip of the needle 2 inserted deeply.
Moreover, FIG. 3 shows the cross section of the washing tank 1 which is another modification. As shown in the drawing, the inlet 12 and the outlet 13 are provided offset from the center line of the cleaning tank 1. With this configuration, the flow of the cleaning liquid does not directly hit the needle tip of the needle 2, and the cleaning liquid smoothly flows in the tank, so that the replacement of the liquid is accelerated and the cleaning effect is improved.

本発明の一実施形態を示す図である。It is a figure which shows one Embodiment of this invention. 本発明の他の実施形態を示す図である。It is a figure which shows other embodiment of this invention. 本発明の他の実施形態を示す図である。It is a figure which shows other embodiment of this invention. 従来のオートサンプラにおける洗浄槽の一例を示す図である。It is a figure which shows an example of the washing tank in the conventional autosampler.

符号の説明Explanation of symbols

1 洗浄槽
2 ニードル
3 洗浄液槽
4 ポンプ
5 洗浄液流路
11 開口
12 導入口
13 排出口
DESCRIPTION OF SYMBOLS 1 Cleaning tank 2 Needle 3 Cleaning liquid tank 4 Pump 5 Cleaning liquid flow path 11 Opening 12 Inlet 13 Outlet

Claims (2)

複数の試料容器からニードルを介して液体試料を逐次採取して液体クロマトグラフに導入するオートサンプラであって、試料を採取後、液体クロマトグラフに導入する前に前記ニードルを自動的に洗浄する洗浄手段を備え、前記洗浄手段は、頂部に前記ニードルを挿入するための開口を有する洗浄槽と前記洗浄槽に洗浄液を導入するための送液手段とを備えて成るものにおいて、前記洗浄液を導入するための導入口を前記洗浄槽の側面に設け、前記導入口からの洗浄液の流れが前記ニードルの先端に直接当たらないように前記ニードルを洗浄槽内の洗浄液に浸漬することを特徴とするオートサンプラ。 An autosampler that sequentially collects a liquid sample from a plurality of sample containers through a needle and introduces the sample into a liquid chromatograph, and automatically cleans the needle after collecting the sample and before introducing the sample into the liquid chromatograph And the cleaning means includes a cleaning tank having an opening for inserting the needle at the top and a liquid feeding means for introducing the cleaning liquid into the cleaning tank, and introduces the cleaning liquid. An autosampler characterized in that an introduction port is provided on a side surface of the cleaning tank, and the needle is immersed in the cleaning liquid in the cleaning tank so that the flow of the cleaning liquid from the introduction port does not directly hit the tip of the needle . 前記洗浄槽がポリエーテル・エーテル・ケトン樹脂を用いて構成されることを特徴とする請求項1に記載するオートサンプラ。 2. The autosampler according to claim 1, wherein the washing tank is configured using a polyether / ether / ketone resin.
JP2004083021A 2004-03-22 2004-03-22 Autosampler Expired - Lifetime JP4174630B2 (en)

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Publication number Priority date Publication date Assignee Title
JPH059355Y2 (en) * 1987-01-16 1993-03-08
JPH01189382A (en) * 1988-01-21 1989-07-28 Kurita Water Ind Ltd Cleaning apparatus
JPH0560736A (en) * 1991-09-02 1993-03-12 Jasco Corp Washing method of needle of autosampler for hplc
JPH08254538A (en) * 1995-03-16 1996-10-01 Olympus Optical Co Ltd Cleaner for medical analyzer
JPH09127078A (en) * 1995-10-31 1997-05-16 Shimadzu Corp Sample injecting device of liquid chromatograph
JP4207361B2 (en) * 2000-04-26 2009-01-14 株式会社島津製作所 Sample injection device
JP2002228668A (en) * 2001-01-31 2002-08-14 Shimadzu Corp Automatic sampler
JP2002277450A (en) * 2001-03-22 2002-09-25 Shimadzu Corp Automatic sampler
JP2003088812A (en) * 2001-09-20 2003-03-25 Furuno Electric Co Ltd Nozzle cleaning device
JP2003294773A (en) * 2002-04-04 2003-10-15 A & T Corp Clinical examination automatic analyzer, cleaning method for clinical examination automatic analyzer

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