JP2010256309A - Conjugate pad and external diagnostic product - Google Patents

Conjugate pad and external diagnostic product Download PDF

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JP2010256309A
JP2010256309A JP2009110014A JP2009110014A JP2010256309A JP 2010256309 A JP2010256309 A JP 2010256309A JP 2009110014 A JP2009110014 A JP 2009110014A JP 2009110014 A JP2009110014 A JP 2009110014A JP 2010256309 A JP2010256309 A JP 2010256309A
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conjugate pad
membrane
water absorption
pad
test
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Seiichi Amano
整一 天野
Takayuki Ogawa
小川  貴之
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Asahi Kasei Corp
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Asahi Kasei Fibers Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a conjugate pad that improves the flowability of liquid and shortens the inspection time without reducing the function of binding an antigen to a labeling antibody. <P>SOLUTION: In the conjugate pad made of synthetic fiber nonwoven fabric and used in the external diagnostic product, basis weight is 30-200 g/m<SP>2</SP>, water absorption speed is 0.3-3 cm/second, and water absorption magnification is within a range of 1-5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、体外診断薬に使用されるコンジュゲートパッドおよびそれを用いた体外診断薬に関するものであり、特に、ラテラルフロー法の簡易検査薬に使用されるコンジュゲートパッドに関する。   The present invention relates to a conjugate pad used for an in-vitro diagnostic agent and an in-vitro diagnostic agent using the same, and particularly to a conjugate pad used for a simple test agent of the lateral flow method.

体外診断薬、特に、簡易検査薬が使用される検査においては、抗原抗体反応を用いる免疫学的な検査が採られることが一般的である。
その方法としては、ラテラルフロー式メンブレンアッセイ法が一般的であり、被測定物を含む溶液を、被測定物に対する検出用物質が塗布された膜に垂直方向に通過させることで、呈色により検出あるいは定量測定を行う。
In a test using an in-vitro diagnostic agent, particularly a simple test agent, an immunological test using an antigen-antibody reaction is generally employed.
As the method, the lateral flow membrane assay method is generally used, and a solution containing an object to be measured is detected by coloration by passing the solution containing the substance to be measured vertically through a film coated with a detection substance for the object to be measured. Alternatively, quantitative measurement is performed.

つまり、被測定物を含む溶液を滴下するサンプルパッドと呼ばれる受液部、サンプルパッドから供給された液を検出部に保持されるように反応させるコンジュゲートパッド、コンジュゲートパッドから液を垂直方向に流すメンブレン膜、液を吸い取り保持する吸液パッドから構成される。このような診断薬吸収体の性能試験をするために用いる検査キットの構成例を図1に示す。   In other words, a liquid receiving part called a sample pad for dropping a solution containing an object to be measured, a conjugate pad for reacting the liquid supplied from the sample pad so as to be held by the detection part, and the liquid from the conjugate pad in the vertical direction It consists of a membrane membrane that flows and a liquid-absorbing pad that sucks and holds the liquid. An example of the configuration of a test kit used for performing a performance test of such a diagnostic agent absorber is shown in FIG.

具体的には、酵素、貴金属コロイド、着色ラテックス、色素などの呈色識別物質で抗体を標識した標識抗体液を、あらかじめコンジュゲートパッドに含浸および乾燥させておき、血液、尿、痰、鼻汁、細胞などの検体を含んだ検査液をサンプルパッドからコンジュゲートパッドに展開させ、抗原と標識抗体とを反応させながら、メンブレン膜に流し、予め抗原を捕捉する抗抗体を塗布したメンブレン上の検出部に捕捉、呈色することで、呈色程度を目視あるいは光学的な変化として測定し、検査液中の抗原の定性測定または定量測定を行う。   Specifically, a labeled antibody solution obtained by labeling an antibody with a color discriminating substance such as an enzyme, a precious metal colloid, a colored latex, or a dye is impregnated and dried in advance in a conjugate pad, and blood, urine, sputum, nasal discharge, A detection solution on the membrane coated with an anti-antibody that preliminarily captures the antigen by spreading a test solution containing specimens such as cells from the sample pad to the conjugate pad, allowing the antigen and labeled antibody to react and flowing through the membrane. By capturing and coloring, the degree of coloration is measured visually or as an optical change, and the qualitative measurement or quantitative measurement of the antigen in the test solution is performed.

上記の検査方法を応用することで、ウイルス感染の有無、妊娠の判定、疾病の確認などを簡易且つ迅速に検査・診断することができ、また、そのための器具及びさまざまな簡易体外診断薬が開発され市販されている。
このような検査・診断においては、コンジュゲートパッドとしての機能は、標識抗体の含浸性、および、検体液をサンプルパッドから受け取り標識抗体と結びつけメンブレン膜に流す液流れ性が必要になる。
By applying the above inspection methods, it is possible to easily and quickly inspect and diagnose the presence or absence of virus infection, determination of pregnancy, confirmation of disease, etc., and the development of instruments and various simple in vitro diagnostics for that purpose And are commercially available.
In such examination / diagnosis, the function as a conjugate pad requires the impregnation property of the labeled antibody and the fluid flow property of receiving the specimen liquid from the sample pad and linking the labeled antibody to the membrane membrane.

コンジュゲートパッドとしては、従来、吸水紙、ろ紙、ガラス繊維不織布、合成繊維不織布、再生セルロース不織布などが使用されている(例えば、特許文献1、特許文献2等参照)。しかし、これらはコンジュゲートパッドとしての機能は十分とは言えず、さらに優れた機能を有するコンジュゲートパッドが求められている。   Conventionally, water absorbent paper, filter paper, glass fiber nonwoven fabric, synthetic fiber nonwoven fabric, regenerated cellulose nonwoven fabric and the like have been used as the conjugate pad (see, for example, Patent Document 1 and Patent Document 2). However, these cannot be said to have a sufficient function as a conjugate pad, and there is a demand for a conjugate pad having a more excellent function.

特に、簡易な体外診断では、判定までの時間を短くすることが要望されている。例えばインフルエンザの判定などでは、検診後、検査を開始するため、結果が出るまでに15〜20分程度を要する。したがって、一度患者を待合室に戻し、結果が判明してから再度検診するため、時間だけでなく、医者にも負担がかかる。   In particular, in a simple in-vitro diagnosis, it is desired to shorten the time until determination. For example, in the case of determination of influenza, since examination is started after examination, it takes about 15 to 20 minutes until the result is obtained. Therefore, since the patient is once returned to the waiting room and the examination is performed again after the result becomes clear, not only the time but also the doctor is burdened.

そのため、検体液、吸水パッド、メンブレン膜など各種の部材で、検査時間短縮の検討がなされている。しかしながら、コンジュゲートパッドに関しては、判定時間への影響が少ないと考えられており、サンプルパッドからの吸い上げが重視されているため、親水性材料のガラス繊維不織布、再生セルロース不織布、濾紙などが使用されているのが現状である。   For this reason, examination of shortening the examination time has been made with various members such as a specimen liquid, a water absorbing pad, and a membrane film. However, the conjugate pad is considered to have little influence on the judgment time, and since the suction from the sample pad is important, hydrophilic fiberglass nonwoven fabric, regenerated cellulose nonwoven fabric, filter paper, etc. are used. This is the current situation.

一方、サンプルパッドからの吸い上げを改良するために、コンジュゲートパッドの親水性を上げると、サンプルパッドからの吸い上げは早くなるが、メンブレン膜への移行が遅くなるだけでなく、標識抗体のリリース性が不十分となり、呈色にも影響することになる。また、比較的吸液速度の早いガラス繊維不織布は、割れやすく、取り扱い性の点や皮膚障害などの点も問題にされている。   On the other hand, increasing the hydrophilicity of the conjugate pad to improve the uptake from the sample pad speeds up the uptake from the sample pad, but not only slows the transfer to the membrane membrane, but also releases the labeled antibody. Will be insufficient and will affect the coloration. Moreover, the glass fiber nonwoven fabric having a relatively high liquid absorption rate is easily broken, and has problems in handling and skin problems.

以上のように、現在、検査時間の短縮を目指した簡易診断薬用のコンジュゲートパッドとして、満足できるものは提案されていないのが現状である。   As described above, at present, satisfactory conjugate pads for simple diagnostic drugs aiming at shortening the examination time have not been proposed.

特許3304214号公報Japanese Patent No. 3304214 特開2006−194785号公報JP 2006-194785 A

本発明は、抗原と標識抗体を結合する機能が低下することなく、液の流動性を高めることで、検査時間を短縮できるコンジュゲートパッドを提供することを目的とする。更に詳しくは、特定範囲の保液性を有する極細不織布を使用することで、毛細管現象により液の流動性を高め、且つ、残液が少ない構成とすることで、サンプルパッドからメンブレン膜に短時間で検体液を受け渡せるコンジュゲートパッドを提供することを目的とする。   An object of this invention is to provide the conjugate pad which can shorten test | inspection time by improving the fluidity | liquidity of a liquid, without reducing the function which couple | bonds an antigen and a labeled antibody. More specifically, by using an ultra-fine nonwoven fabric with a specific range of liquid-retaining properties, the fluidity of the liquid is increased by capillary action, and the remaining liquid is reduced, so that a short time can be applied from the sample pad to the membrane membrane. It is an object of the present invention to provide a conjugate pad that can deliver a sample liquid.

本発明者らは、上記課題を解決するために検討した結果、保液の少ない極細の合成繊維不織布を使用することで、毛細管現象により検査液を吸い取り、メンブレン膜に素早く受け渡せることに着目し、特定範囲の目付け、吸水速度、吸水倍率の合成繊維不織布をコンジュゲートパッドにすることで、正確かつ短時間の検査が可能となることを見出し、本発明をなすに至った。   As a result of investigations to solve the above-mentioned problems, the present inventors have paid attention to the fact that by using an ultrafine synthetic fiber nonwoven fabric with little liquid retention, the test liquid can be absorbed by the capillary phenomenon and quickly transferred to the membrane film. The inventors have found that by using a synthetic fiber nonwoven fabric having a specific weight per unit area, a water absorption speed, and a water absorption ratio as a conjugate pad, an accurate and short-time inspection can be performed, and the present invention has been made.

即ち、本発明は下記の通りである。
1.目付けが30〜200g/m、吸水速度が0.3〜3cm/秒、吸水倍率が1〜5の範囲である合成繊維不織布からなることを特徴とする体外診断薬に使用されるコンジュゲートパッド。
That is, the present invention is as follows.
1. A conjugate pad used for an in vitro diagnostic agent, characterized by comprising a synthetic fiber nonwoven fabric having a basis weight of 30 to 200 g / m 2 , a water absorption rate of 0.3 to 3 cm / second, and a water absorption ratio of 1 to 5. .

2.前記合成繊維不織布の平均繊維径が0.5〜3.0μmであって、空孔率が60〜85%であることを特徴とする上記1に記載のコンジュゲートパッド。
3.上記1または2に記載されているコンジュゲートパッドに、標識抗体が含浸されてなることを特徴とする体外診断薬。
2. 2. The conjugate pad according to 1 above, wherein the synthetic fiber nonwoven fabric has an average fiber diameter of 0.5 to 3.0 [mu] m and a porosity of 60 to 85%.
3. An in vitro diagnostic agent, wherein the conjugate pad described in 1 or 2 above is impregnated with a labeled antibody.

本発明のコンジュゲートパッドは、毛細管現象を利用し、特定の目付け、吸水速度、吸水倍率にすることで、検体液と標識抗体との結合およびメンブレン膜への移動が迅速に行われ、少量の検体液でも正確かつ短時間で検査あるいは評価ができるものである。   The conjugate pad of the present invention utilizes capillary action, and has a specific basis weight, water absorption speed, water absorption magnification, so that the binding between the sample liquid and the labeled antibody and the movement to the membrane membrane are performed rapidly, and a small amount of Even a sample liquid can be examined or evaluated accurately and in a short time.

診断薬用吸収体の性能試験をするために用いる検査キットの一例を概略的に示す図である(なお、上は側面図、下は平面図である)。It is a figure which shows roughly an example of the test | inspection kit used in order to perform the performance test of the absorber for diagnostic agents (Note that the upper part is a side view and the lower part is a plan view).

以下、本発明について詳述する。
体外診断薬用コンジュゲートパッドにおいて、親液性が強いとメンブレン膜にリリースし難くなり、検査時間が長くなる。また、標識抗体との結びつきが強すぎると、検体液が流れてきても標識抗体のリリース性(色抜け性)が不十分となり、検出部での呈色濃度が低くなってしまい、検査が曖昧になる。保液量が多くなると、検査液および標識抗体が残るため、検査液や標識抗体量を増やす必要があるだけでなく、検査液と標識抗体の結びつきの点でも問題になる。
Hereinafter, the present invention will be described in detail.
In the in vitro diagnostic drug conjugate pad, if the lyophilic property is strong, it is difficult to release it to the membrane membrane, and the test time becomes longer. In addition, if the binding with the labeled antibody is too strong, even if the sample liquid flows, the release property (color loss) of the labeled antibody becomes insufficient, the color density at the detection unit becomes low, and the test is ambiguous. become. If the amount of the retentate increases, the test solution and the labeled antibody remain, so it is not only necessary to increase the amount of the test solution and the labeled antibody, but also a problem in terms of the connection between the test solution and the labeled antibody.

上記のような問題に鑑み、本発明のコンジュゲートパッドは、特定の目付け、吸水速度、吸収倍率を有することで、サンプルパッドからの吸い上げ、メンブレン膜へのリリース性を満足し、検査残液も残りにくいという優れた特徴を有する。   In view of the above problems, the conjugate pad of the present invention has a specific basis weight, a water absorption speed, and an absorption magnification, so that it absorbs from the sample pad and releases to the membrane membrane, and the test residual liquid is also It has an excellent feature that it is difficult to remain.

本発明において、コンジュゲートパッドの目付けは、30〜200g/mである。目付けは、コンジュゲートパッドの大きさや検体液量、検査種類等により適宜変えることができるが、目付けが30g/m未満であると、標識抗体を付着させる加工時に問題になるだけでなく、取り扱いの点でも好ましくない。また、目付けが200g/mを超えると、検査液の吸収量が大きくなるため好ましくない。目付けは、好ましくは50〜150g/mである。 In the present invention, the basis weight of the conjugate pad is 30 to 200 g / m 2 . The basis weight can be appropriately changed depending on the size of the conjugate pad, the amount of sample liquid, the type of test, etc. If the basis weight is less than 30 g / m 2 , it will not only be a problem during processing to attach the labeled antibody, but also be handled. This is also not preferable. On the other hand, if the basis weight exceeds 200 g / m 2 , the amount of the test solution absorbed increases, which is not preferable. The basis weight is preferably 50 to 150 g / m 2 .

コンジュゲートパッドの吸水速度は、JIS−L1907で規定されるバイレッグ吸水法により、コンジュゲートパッドが検査液の流れる方向に合わせて、10cmの高さまで要する時間を測定し、評価を行う。本発明においては、吸水速度が0.3〜3cm/秒であることが検査時間短縮のために必要である。0.3cm/秒未満であると、検査液のメンブレン膜への移行が遅くなりすぎ、メンブレン膜上での検査液の流れも遅くなり、検査時間が遅くなり好ましくない。また、3cm/秒を超えると、検査種類にもよるが、標識抗体と検査液との結びつきが不十分になりやすく、また、メンブレン膜上の移動が律速となるため、検査時間短縮の効果が少なくなるため好ましくない。吸水速度は、好ましくは1〜2cm/秒である。   The water absorption speed of the conjugate pad is evaluated by measuring the time required for the conjugate pad to reach a height of 10 cm in accordance with the bileg water absorption method defined in JIS-L1907 in accordance with the direction in which the test solution flows. In the present invention, a water absorption speed of 0.3 to 3 cm / second is necessary for shortening the inspection time. If it is less than 0.3 cm / sec, the transfer of the test solution to the membrane film becomes too slow, the flow of the test solution on the membrane film also becomes slow, and the test time becomes slow, which is not preferable. If it exceeds 3 cm / sec, depending on the type of test, the connection between the labeled antibody and the test solution tends to be insufficient, and the movement on the membrane membrane is rate-limiting, resulting in an effect of shortening the test time. Since it decreases, it is not preferable. The water absorption rate is preferably 1 to 2 cm / second.

コンジュゲートパッドの吸水倍率は1〜5であり、好ましくは2〜3である。コンジュゲートパッドの吸水倍率が1未満であると、サンプルパッドからの吸い上げが不十分になりやすく、標識抗体の含浸も難しくなり、好ましくない。また、5を超えると、検査液および標識抗体が残るため、検査液や標識抗体量を増やす必要があるだけでなく、検査液と標識抗体の結びつきの点でも問題になり好ましくない。   The water absorption capacity of the conjugate pad is 1-5, preferably 2-3. When the water absorption ratio of the conjugate pad is less than 1, it is not preferable because the absorption from the sample pad tends to be insufficient and impregnation with the labeled antibody becomes difficult. On the other hand, if the number exceeds 5, the test solution and the labeled antibody remain, so that it is not only necessary to increase the amount of the test solution and the labeled antibody, but it is also undesirable in terms of the connection between the test solution and the labeled antibody.

本発明のコンジュゲートパッドは、合成繊維不織布で構成されており、好ましくは、平均繊維径が0.5〜3.0μm、より好ましくは0.5〜2.0μmであって、空孔率が60〜85%である極細繊維からなる合成繊維不織布が好ましい。   The conjugate pad of the present invention is composed of a synthetic fiber nonwoven fabric, preferably having an average fiber diameter of 0.5 to 3.0 μm, more preferably 0.5 to 2.0 μm, and a porosity of A synthetic fiber nonwoven fabric composed of 60 to 85% ultrafine fibers is preferred.

本発明のコンジュゲートパッドの吸水速度および吸水倍率を達成するためには、毛細管現象で吸い上げる必要がある。平均繊維径が3.0μmより大きい場合や、空隙率が85%を超えると、毛細管現象が見られず、吸水速度が上がらず、サンプルパッドからの吸い上げが不十分になる傾向がある。また、繊維径が0.5μmを下回る場合は、検査液の固形物により詰まる可能性や機械強度が弱くなる傾向がある。空孔率が60%を下回る場合も、固形物のつまりや標識抗体の含浸性の点で問題となる傾向がある。   In order to achieve the water absorption rate and the water absorption rate of the conjugate pad of the present invention, it is necessary to suck up by capillary action. When the average fiber diameter is larger than 3.0 μm or when the porosity exceeds 85%, capillary action is not observed, the water absorption speed does not increase, and suction from the sample pad tends to be insufficient. Moreover, when a fiber diameter is less than 0.5 micrometer, there exists a tendency for possibility that it will be clogged with the solid substance of a test solution, and mechanical strength to become weak. Even when the porosity is less than 60%, there is a tendency to become a problem in terms of solid matter clogging or labeled antibody impregnation.

合成繊維としては、上記コンジュゲートパッドの物性を満足すれば限定されないが、例えば、ポリオレフィン系、ポリエステル系、ポリアミド系、アクリル系等が挙げられ、これらの一種又は二種以上を用いてもよい。不織布の製法としては、スパンボンド法、メルトブロー法、フラッシュスパン法、抄造法などが挙げられ、更に、それぞれの方法を組み合わせた不織布、例えば、スパンボンド/メルトブロー/スパンボンド(SMS)などや、上記不織布を熱処理やバインダーによる接着によって複合しても良い。   Synthetic fibers are not limited as long as the physical properties of the conjugate pad are satisfied, and examples thereof include polyolefins, polyesters, polyamides, acrylics, and the like, and one or more of these may be used. Examples of the method for producing the nonwoven fabric include a spunbond method, a melt blow method, a flash span method, a papermaking method, and the like, and further, a nonwoven fabric combining the respective methods, for example, a spun bond / melt blow / spun bond (SMS), etc. The nonwoven fabric may be combined by heat treatment or adhesion with a binder.

本発明のコンジュゲートパッドのサイズについては、必要な物性を満足すれば限定されないが、例えば、液流れ方向については、検体液からの結びつき性や検査時間を考慮すると、長さ3〜15mm程度であることが好ましい。巾(液流れに対し垂直)方向については、メンブレン膜やサンプルパッドの巾より小さければ問題はない。巾が広すぎると、メンブレン膜の裏面に検査液が裏回りしまう可能性がある。   The size of the conjugate pad of the present invention is not limited as long as necessary physical properties are satisfied. For example, the liquid flow direction is about 3 to 15 mm in length in consideration of the connection from the sample liquid and the test time. Preferably there is. There is no problem as long as the width (perpendicular to the liquid flow) direction is smaller than the width of the membrane film or the sample pad. If the width is too wide, there is a possibility that the test solution will be behind the membrane film.

上記合成繊維不織布の親水性、撥水性、吸水倍率をコントロールするため、各種薬剤や粉体を、抗体抗原反応や標識抗体との結びつきに影響しない範囲で含有させても良い。例えば、界面活性剤、撥水剤、繊維を固定するための樹脂、抗菌剤、防腐剤、酸化防止剤などを含有させることができる。   In order to control the hydrophilicity, water repellency, and water absorption of the synthetic fiber nonwoven fabric, various chemicals and powders may be contained within a range that does not affect the antibody antigen reaction or the binding with the labeled antibody. For example, a surfactant, a water repellent, a resin for fixing fibers, an antibacterial agent, an antiseptic, an antioxidant, and the like can be contained.

本発明において、使用される希釈検体液、検査キット形状、サンプルパッド、吸水パッド、メンブレン膜、標準抗体、呈色識別物質は、公知のものが使用でき、限定されるものでない。また、希釈検体液は、標識抗体の他に、薄め液、各種界面活性剤、塩分等を添加する場合もあり、滴下前に、検体採取時の固形物や標準抗体に含まれるコンタミ成分等を除去するため、ガラス繊維や濾紙フィルターなどで濾過して使用しても良い。   In the present invention, known diluted specimen liquids, test kit shapes, sample pads, water absorbing pads, membrane membranes, standard antibodies, and color identification substances can be used and are not limited. In addition to the labeled antibody, the diluted sample solution may contain a dilute solution, various surfactants, salt content, etc., and before dropping, remove solids at the time of sample collection, contamination components contained in the standard antibody, etc. In order to remove it, it may be used after being filtered with glass fiber or a filter paper filter.

以下、実施例により本発明をさらに説明するが、本発明はこれら実施例により何ら限定されるものではない。
まず、本発明の実施例の評価に使用される部材、検査液等について説明する。
EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited at all by these Examples.
First, members, test solutions and the like used for evaluation of the examples of the present invention will be described.

(a)抗体固定化メンブレン膜
ニトロセルロースメンブレン膜(ポアサイズ60μm)上に、マウス抗インフルエンザA型ウィルス抗体液を、巾2mmの線状になるように塗布して乾燥を行い、マリアリムAFB−1521およびトリス塩酸緩衝液によりブロッキングし、抗体固定化メンブレン膜を得た。得られた抗体固定化メンブレン膜を、巾5mm、長さ30mmになるようにサンプリングした。抗体固定化位置は流れ方向に垂直となり、長さ20mmの位置になった。
(A) Antibody-immobilized membrane membrane A mouse anti-influenza A virus antibody solution was applied onto a nitrocellulose membrane membrane (pore size 60 μm) so as to form a line with a width of 2 mm, dried, and Marialim AFB-1521 and The membrane was blocked with a Tris-HCl buffer to obtain an antibody-immobilized membrane. The obtained antibody-immobilized membrane was sampled to have a width of 5 mm and a length of 30 mm. The antibody immobilization position was perpendicular to the flow direction and was 20 mm long.

(b)標識抗体
およそ60nmの金コロイドと、上記抗体固定化メンブレン膜に使用した抗体とは別のエピトープを認識する抗体を、ホウ酸緩衝液(PH9.0)中で混合した後、BSA10%水溶液を添加してブロッキングを行った後、遠心分離により標識抗体を得た。
(B) Labeled antibody A colloidal gold of about 60 nm and an antibody recognizing an epitope different from the antibody used for the antibody-immobilized membrane membrane were mixed in a borate buffer (PH 9.0), and then BSA 10% After blocking by adding an aqueous solution, a labeled antibody was obtained by centrifugation.

(c)発色用希釈検査液
上記標識抗体を、0.2%Tween20、1%スクロースおよび0.2BSAを含むPBSに混合し、A型インフルエンザ精製抗原(Kitakyusyu/159/93株由来)を含む希釈検体液(ウィルスをTCID50/test単位で1×10の濃度)を添加し、調整した。
(C) Dilution test solution for color development The above labeled antibody is mixed with PBS containing 0.2% Tween20, 1% sucrose and 0.2BSA, and diluted containing influenza A purified antigen (Kitakyusyu / 159/93 strain) A sample solution (virus concentration of 1 × 10 6 in TCID50 / test unit) was added and adjusted.

(d)コンジュゲートパッドへの標識抗体含浸
コンジュゲートパッド(5mm×5mm)に上記(b)の標識抗体を10μlを含浸し、凍結乾燥を実施し、標識抗体を含浸したコンジュゲートパッドを得た。
(D) Impregnation of labeled antibody into conjugate pad The conjugate pad (5 mm × 5 mm) was impregnated with 10 μl of the labeled antibody of (b) above, and lyophilized to obtain a conjugate pad impregnated with the labeled antibody. .

(e)性能試験をするために用いる検査キット
図1に示すような、台紙5の上にメンブレン膜1を貼り付け、メンブレン膜の端部にコンジュゲートパッド2を置き、もう一方の端部に吸水パッド4(5mm巾、長さ20mm、メンブレン膜との重なり5mm:No526(アドバンテック社製))を置いた。コンジュゲートパッド2に重なるようにサンプルパッド3(5mm巾、長さ15mm、コンジュゲートパッドの重なり5mm:ベンリーゼNE107(旭化成社製))を配置し、最後に透明なテープで上部から台紙を覆うように貼り付けて固定した。
(E) Inspection kit used for performance test As shown in FIG. 1, the membrane film 1 is pasted on the mount 5, the conjugate pad 2 is placed on the end of the membrane film, and the other end is placed. A water absorbing pad 4 (5 mm wide, 20 mm long, 5 mm overlap with membrane membrane: No526 (manufactured by Advantech)) was placed. Sample pad 3 (5 mm wide, 15 mm long, 5 mm overlap of conjugate pad: Benlyse NE107 (manufactured by Asahi Kasei Co., Ltd.)) is placed so as to overlap with conjugate pad 2, and finally the mount is covered with a transparent tape from above. Affixed to and fixed.

測定方法、評価方法等は下記の通りである。
(1)厚み(mm)
ピーコック厚み計を用いて、接圧20g/cmの条件で測定を実施した。
Measurement methods, evaluation methods, etc. are as follows.
(1) Thickness (mm)
Using a peacock thickness meter, the measurement was performed under the condition of a contact pressure of 20 g / cm 2 .

(2)目付け(g/m
0.5m以上の面積の不織布を、105℃で一定重量になるまで乾燥し、20℃、65%RHの恒温室に16時間以上放置後、その重量を測定し、不織布の単位面積当たりの重量(g/m)を求めた。
(2) Weight per unit area (g / m 2 )
A non-woven fabric having an area of 0.5 m 2 or more is dried to a constant weight at 105 ° C., left in a temperature-controlled room at 20 ° C. and 65% RH for 16 hours or more, and then the weight is measured. The weight (g / m 2 ) was determined.

(3)空孔率
上記(1)および(2)で測定した厚み、目付けおよび使用した各素材の比重より、下記式で算出した。
空孔率(%)={1−目付け(g/m)/比重(g/cm)/厚み(mm)/1000}}×100
(3) Porosity Calculated by the following formula from the thickness, basis weight, and specific gravity of each material used in (1) and (2) above.
Porosity (%) = {1−weight per unit area (g / m 2 ) / specific gravity (g / cm 3 ) / thickness (mm) / 1000}} × 100

(4)吸水倍率
吸収体を、20℃、65%RHに制御された室内に15時間放置して調湿し、10cm角に切断したサンプルを秤量した(W1(g)とする)。次いで、線径0.5mm、10メッシュの金網上にサンプルを置き、金網ごと20℃の水中へ30秒浸漬した。その後、サンプルを金網上で水平に保ったまま空中で10分間放置して水切りを行い、再度、秤量し(W2(g)とする)、下記式で吸水倍率を求めた。
吸水倍率=(W2−W1)/W1
(4) Water Absorption Magnification The absorber was left in a room controlled at 20 ° C. and 65% RH for 15 hours to adjust the humidity, and a sample cut into 10 cm square was weighed (referred to as W1 (g)). Next, the sample was placed on a wire mesh of wire diameter 0.5 mm and 10 mesh, and the wire mesh was immersed in water at 20 ° C. for 30 seconds. Thereafter, the sample was left in the air for 10 minutes while being kept horizontal on the wire mesh, drained, weighed again (referred to as W2 (g)), and the water absorption ratio was determined by the following formula.
Water absorption magnification = (W2-W1) / W1

(5)吸水速度
JIS−L1907で規定されるバイレッグ吸水法により、コンジュゲートパッドが検査液の流れる方向に合わせて、10cmの高さまで要する時間を測定し、評価を行った。
試料は、200mm(長さ)×25mm(巾)とし、20℃、65%RHに制御された室内に15時間放置し調湿した後、測定を実施した。
吸水速度(cm/秒)=10cm/(10cm高さ到達時間(秒))
(5) Water absorption speed By the bi-leg water absorption method prescribed | regulated by JIS-L1907, the time required to the height of 10 cm was measured according to the direction through which a conjugate pad flows, and evaluation was performed.
The sample was 200 mm (length) × 25 mm (width), and the sample was allowed to stand for 15 hours in a room controlled at 20 ° C. and 65% RH.
Water absorption speed (cm / sec) = 10 cm / (10 cm height arrival time (sec))

(6)コンジュゲートパッドの色抜け性及び呈色終了時間
上記の部材および検査液を使用し、発色性の指標および検査時間を、以下の方法で評価を行った。上記(e)の検査キットを使用し、サンプルパッドに発色用希釈検査液を抗体液塗布面に3滴(90μl相当)滴下し、コンジュゲートパッドの色抜け性および抗体固定化メンブレン膜の塗布部での呈色までの時間を測定した。
(6) Color loss of conjugate pad and coloration end time Using the above-mentioned members and test solution, the color development index and test time were evaluated by the following methods. Using the test kit of (e) above, 3 drops (equivalent to 90 μl) of the color developing dilution test solution are dropped onto the sample pad on the surface of the antibody solution, and the color of the conjugate pad and the coating part of the antibody-immobilized membrane membrane are applied. The time until coloration was measured.

(色抜け性)
滴下後、3分後の状態および塗布部で規定の呈色濃度になった際の色抜け性を下記の基準で評価した。
○:白色(標識抗体未処理の状態)又は殆ど着色がない状態
△:着色が薄くなっているか、あるいは、部分的に着色がわかる
×:着色が殆ど薄くなっていない
(Color loss)
After dropping, the state after 3 minutes and the color loss at the time when the color density reached the prescribed level in the coated part were evaluated according to the following criteria.
○: White (the state in which the labeled antibody has not been treated) or almost no coloration Δ: The coloration is faint, or the coloration is partially recognized ×: The coloration is hardly lightened

(呈色終了時間)
抗体固定化メンブレン膜の塗布部の呈色が一定濃度(限度見本との比較)以上になるまでの時間(分)を測定した。
(Coloring end time)
The time (minutes) until the color of the application part of the antibody-immobilized membrane film became equal to or higher than a certain concentration (compared to the limit sample) was measured.

[実施例1〜3]
メルトブロー方式を用いて、表1に示す物性の不織布を作成した。
この不織布をコンジュゲートパッドとして用いて検査キットを作成し、コンジュゲートパッドの色抜け性と呈色時間について評価を行った。その結果を表2に示す。
[Examples 1 to 3]
Non-woven fabrics having the physical properties shown in Table 1 were prepared using the melt blow method.
A test kit was prepared using this nonwoven fabric as a conjugate pad, and the color loss and coloration time of the conjugate pad were evaluated. The results are shown in Table 2.

[比較例1及び2]
メルトブロー方式を用いて、表1に示す物性の不織布を作成した。実施例1と同様に評価を行った結果を表2に示す。
[Comparative Examples 1 and 2]
Non-woven fabrics having physical properties shown in Table 1 were prepared using a melt-blowing method. Table 2 shows the results of evaluation in the same manner as in Example 1.

[比較例3]
スパンボンド方式で製造した「エルタス」E05100(旭化成せんい社製)を用いた。表1にその物性を示す。実施例1と同様に評価を行った結果を表2に示す。
[Comparative Example 3]
“Eltas” E05100 (manufactured by Asahi Kasei Fibers) manufactured by a spunbond method was used. Table 1 shows the physical properties. Table 2 shows the results of evaluation in the same manner as in Example 1.

[比較例4]
湿式スパンボンド方式で製造された「ベンリーゼ」NE107(旭化成せんい社製)を用いた。表1にその物性を示す。実施例1と同様に評価を行った結果を表2に示す。
[Comparative Example 4]
“Benlyse” NE107 (manufactured by Asahi Kasei Fibers) manufactured by a wet spunbond method was used. Table 1 shows the physical properties. Table 2 shows the results of evaluation in the same manner as in Example 1.

[比較例5]
ガラス繊維濾紙BF/A(ワットマン社製)を用いた。表1にその物性を示す。実施例1と同様に評価を行った結果を表2に示す。
[Comparative Example 5]
Glass fiber filter paper BF / A (manufactured by Whatman) was used. Table 1 shows the physical properties. Table 2 shows the results of evaluation in the same manner as in Example 1.

本発明(実施例1〜3)のコンジュゲートパッドは、コンジュゲートパッドからの色抜け性が良好であった。つまり、標識抗体のリリース性も適正であり、コンジュゲートパッド内での検査液の残液が少ないことが判る。その結果、従来品(比較例5)と比較して、検査時間が大幅に短縮できることが判る。   The conjugate pad of the present invention (Examples 1 to 3) had good color loss from the conjugate pad. That is, it can be seen that the release property of the labeled antibody is also appropriate, and there is little residual liquid of the test solution in the conjugate pad. As a result, it can be seen that the inspection time can be greatly reduced as compared with the conventional product (Comparative Example 5).

比較例1では、吸水速度が遅いため、コンジュゲートパッド内での移行速度が遅く、呈色終了時間が遅いことがわかる。
比較例2では、空孔率が小さいため、毛細管現象が起こりにくく、サンプルパッドからの吸い上げも不十分となり、コンジュゲートパッドからの色抜け性および呈色終了時間とも不十分であった。
In Comparative Example 1, since the water absorption speed is slow, it can be seen that the transition speed in the conjugate pad is slow and the coloration end time is slow.
In Comparative Example 2, since the porosity was small, the capillary phenomenon hardly occurred, the suction from the sample pad was insufficient, and the color loss from the conjugate pad and the color completion time were insufficient.

比較例3では、繊維径が太く、毛細管現象が発生しないため、吸水速度が遅く、サンプルパッドからの吸い上げも不十分となり、コンジュゲートパッドからの色抜け性および呈色終了時間とも不十分であった。
比較例4では、吸収倍率が高く、メンブレン膜への移行が遅く、検査液の残液も多くなってしまうため、不十分な結果であった。

Figure 2010256309
Figure 2010256309
In Comparative Example 3, since the fiber diameter is large and capillary action does not occur, the water absorption rate is slow, the suction from the sample pad is insufficient, and the color loss from the conjugate pad and the coloration end time are insufficient. It was.
In Comparative Example 4, the absorption ratio was high, the transition to the membrane film was slow, and the residual liquid of the test solution was increased.
Figure 2010256309
Figure 2010256309

本発明のコンジュゲートパッドは、毛細管現象を利用し、特定の目付け、吸水速度、吸水倍率にすることで、検体液と標識抗体との結びつけおよびメンブレン膜に移動を迅速に行い、正確かつ検査時間短縮に寄与できるものであり、各種のラテラルフロー方式の検査キットに使用することが可能となる。   The conjugate pad of the present invention makes use of capillary action and has a specific basis weight, water absorption speed, water absorption magnification, quickly linking the sample liquid to the labeled antibody and moving to the membrane membrane, accurately and testing time. It can contribute to shortening and can be used for various lateral flow type inspection kits.

1 メンブレン膜
1a 塗布部(呈色箇所)
2 コンジュゲートパッド
3 サンプルパッド
4 吸水パッド
5 台紙
1 Membrane membrane
1a Application part (colored part)
2 Conjugate pad 3 Sample pad 4 Water absorbing pad 5 Mount

Claims (3)

目付けが30〜200g/m、吸水速度が0.3〜3cm/秒、吸水倍率が1〜5の範囲である合成繊維不織布からなることを特徴とする体外診断薬に使用されるコンジュゲートパッド。 A conjugate pad used for an in vitro diagnostic agent, characterized by comprising a synthetic fiber nonwoven fabric having a basis weight of 30 to 200 g / m 2 , a water absorption rate of 0.3 to 3 cm / second, and a water absorption ratio of 1 to 5. . 前記合成繊維不織布の平均繊維径が0.5〜3.0μmであって、空孔率が60〜85%であることを特徴とする請求項1に記載のコンジュゲートパッド。   2. The conjugate pad according to claim 1, wherein the synthetic fiber nonwoven fabric has an average fiber diameter of 0.5 to 3.0 μm and a porosity of 60 to 85%. 請求項1または2に記載されているコンジュゲートパッドに、標識抗体が含浸されてなることを特徴とする体外診断薬。   An in vitro diagnostic agent, wherein the conjugate pad according to claim 1 or 2 is impregnated with a labeled antibody.
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Publication number Priority date Publication date Assignee Title
JP2012189355A (en) * 2011-03-09 2012-10-04 Furukawa Electric Co Ltd:The Lateral flow test strip
US10473656B2 (en) 2014-02-28 2019-11-12 Ricoh Company, Ltd. Testing device including resin layer, testing kit, transfer member, testing device fabrication method, and testing method
US10138344B2 (en) 2015-03-19 2018-11-27 Ricoh Company, Ltd. Particulate polyamide, and method for preparing the particulate polyamide
US10323134B2 (en) 2015-03-19 2019-06-18 Ricoh Company, Ltd. Particulate polyamide, and method for preparing the particulate polyamide
JP2020056590A (en) * 2018-09-28 2020-04-09 旭化成株式会社 Immunochromatographic diagnostic kit
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WO2020158750A1 (en) * 2019-01-31 2020-08-06 旭化成株式会社 Absorbent pad for immunochromatographic diagnosis kit
KR20210106525A (en) * 2019-01-31 2021-08-30 아사히 가세이 가부시키가이샤 Absorbent Pad for Immunochromato Diagnostic Kit
JPWO2020158750A1 (en) * 2019-01-31 2021-10-28 旭化成株式会社 Absorption pad for immunochromatographic diagnostic kit
JP7128911B2 (en) 2019-01-31 2022-08-31 旭化成株式会社 Absorbent pad for immunochromatography diagnostic kit
KR102601382B1 (en) 2019-01-31 2023-11-10 아사히 가세이 가부시키가이샤 Absorbent pad for immunochromatography diagnostic kit

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