WO2017163341A1 - イムノクロマト法検査デバイスの試料添加部の形成方法及びイムノクロマト法検査デバイス - Google Patents
イムノクロマト法検査デバイスの試料添加部の形成方法及びイムノクロマト法検査デバイス Download PDFInfo
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- WO2017163341A1 WO2017163341A1 PCT/JP2016/059218 JP2016059218W WO2017163341A1 WO 2017163341 A1 WO2017163341 A1 WO 2017163341A1 JP 2016059218 W JP2016059218 W JP 2016059218W WO 2017163341 A1 WO2017163341 A1 WO 2017163341A1
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- sample addition
- test device
- sample
- surfactant
- addition part
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Images
Classifications
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- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
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- G01N33/54393—Improving reaction conditions or stability, e.g. by coating or irradiation of surface, by reduction of non-specific binding, by promotion of specific binding
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- G01N33/52—Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper and including single- and multilayer analytical elements
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Definitions
- the present invention relates to a method for forming a sample addition portion of an immunochromatography test device and an immunochromatography test device having a sample addition portion formed by the method.
- simple test reagents and kits have been developed that perform various tests in a short time, such as the presence or absence of pathogen infections such as viruses and bacteria, and the presence or absence of pregnancy.
- Pathogen components, human chorionic gonadotropins, and the like are targets for detection or quantification.
- Many of the simple test reagents have the feature that they do not require special equipment, are easy to operate and are inexpensive, and for example, simple test reagents for pregnancy diagnosis are sold at general pharmacies.
- simple test reagents for testing pathogen infection are widely used in general hospitals and clinics in addition to large hospitals and medical test centers. These facilities are often the first medical institutions visited by patients, and if the presence or absence of infection is identified on the spot for samples collected from patients, treatment measures can be taken at an early stage. The importance in medicine is increasing.
- an immunoassay method using an antigen-antibody reaction is generally known as a simple test method.
- Immunochromatography is a method of detecting / quantifying the label by forming a complex of a capture body (capture substance) that specifically binds to the target substance and a labeled body that specifically binds to the target object. Detecting (measuring or quantifying) an object to be detected.
- the immunochromatography method is widely used for detecting a wide variety of objects to be detected because of its simple measuring device and excellent cost.
- a detection part in which an antibody that specifically binds to a detection target is immobilized on a membrane strip such as nitrocellulose as a capture substance, and a label that specifically binds to the detection target A specimen sample containing a detection object is dropped on a test device having a label body portion containing, and is developed while forming a complex of the detection object-label body, and the detection portion captures this complex.
- the label is detected or quantified by using (for example, Patent Document 1 and Patent Document 2).
- the reagent impregnated in the sample addition part may cause a concentration difference in the sample addition part due to drying unevenness or the like.
- the impregnated reagent and the sample are not mixed well, and the sample sample may not be smoothly spread on the membrane.
- the measurement speed becomes slow because the specimen sample is not rapidly developed on the membrane, and the background becomes high because the specimen sample stays on the membrane.
- an object of the present invention is to improve the above-mentioned problems, and to detect or quantify the presence of an object to be detected more quickly and with higher sensitivity than conventional measurement methods, and an immunochromatographic test device and a sample thereof It is to provide a method for forming an addition portion.
- the present inventors use a test device having a sample addition part that improves the recovery of the reagent impregnated in the sample addition part in an immunochromatography method using a porous substrate such as a nitrocellulose membrane.
- a porous substrate such as a nitrocellulose membrane.
- the present invention provides the following.
- a method for forming a sample addition part of an immunochromatography test device which comprises applying a normal white powdery surfactant to the sample addition part and drying it.
- the surfactant is an anionic, nonionic or amphoteric surfactant having a molecular weight of 200 to 900.
- the surfactant is at least one selected from the group consisting of deoxycholic acid and salts thereof and cholic acid and salts thereof.
- the surfactant is sodium deoxycholate.
- An immunochromatographic test device including a sample addition portion formed by the method according to any one of (1) to (4).
- the sample sample and the reagent impregnated in the sample addition portion are mixed well, and the sample sample is rapidly developed on the membrane. Therefore, the background is low, there are few false positives, and the measurement can be performed quickly and with high sensitivity.
- the sample addition part is a part to which a specimen sample is added in an immunochromatography test device.
- the sample addition part is made by placing a pad made of a porous substrate such as a nonwoven material such as sponge or glass fiber on a porous substrate such as a nitrocellulose membrane constituting the device body. It is formed.
- the pad can be called a sample addition pad.
- the sample addition part is preferably provided at one end on the test piece.
- a reagent necessary for the antigen-antibody reaction can be applied in advance to the sample addition part.
- a surfactant can be applied so that non-specific components in the specimen sample do not participate in the antigen-antibody reaction, or a hemolytic agent can be applied when measuring a blood specimen.
- the specimen sample is often suspended in the suspension in advance and then added to the sample addition part.
- the analyte is diluted by diluting the specimen sample, which impairs the detection sensitivity. It will be. Therefore, a buffer, a surfactant, various proteins, salts, and saccharides that are components of the sample suspension can be applied in advance.
- a surfactant in the form of a white powder in a normal state it is necessary to apply a surfactant in the form of a white powder in a normal state to the sample addition part.
- the present inventors have found that in this immunochromatography method, the specimen sample is rapidly developed on the membrane, and the detection object can be detected with high sensitivity. It came.
- the term “normally white powder” means that the surfactant is in the form of white powder when present alone at normal temperature (25 ° C.) and normal pressure (1 atm). If a surfactant in the form of liquid, paste, or wax is used as the other surfactant, drying may be insufficient, there may be a problem with the stability of the sample addition section, or the sample may be added.
- the rapid penetration effect is not sufficient and is not suitable for the present invention.
- the surfactant is usually dissolved in an aqueous medium and applied to the porous substrate, one having excellent water solubility is preferable.
- white powdery surfactants surfactants having a molecular weight of 200 to 900 are preferable in that they are excellent in water solubility and stability and can provide the effects of the present invention.
- deoxycholic acid and its salt and cholic acid and its salt which are anionic.
- sodium cholate and sodium deoxycholate are: It is more preferable because it has good water solubility and is inexpensive.
- a method of applying the surfactant to the sample addition part a method of adding a surfactant solution, preferably an aqueous solution containing water or an aqueous buffer as a solvent, by impregnation or dropping is preferable.
- concentration of the surfactant in the surfactant solution is usually 0.005% by mass to 5% by mass, preferably 0.05% by mass to 2% by mass.
- the amount of the surfactant added to the sample addition part is usually about 0.0013 mg to 10 mg, preferably about 0.005 mg to 4 mg.
- the effect of containing the surfactant is that when the suspension is applied to the porous substrate and dried, the surfactant is present in the sample addition portion as a fine crystalline state as the water molecules evaporate. This is probably because the specimen sample penetrates into the sample addition part without unevenness and is rapidly developed on the membrane.
- the reagent necessary for the antigen-antibody reaction is applied to the sample addition part in advance, the concentration unevenness and self-aggregation during drying of the reagent necessary for the antigen-antibody reaction are remarkably prevented.
- the surfactant is normally powdery, it can be kept in a dry state, has good storage stability, and is easy to handle. Furthermore, since it is white, it does not interfere with the determination of the inspection result by visual inspection.
- specimen samples include pharyngeal or nasal wipes, nasal aspirate, pharyngeal or nasal wash, saliva, serum, plasma, whole blood, stool suspension, urine, culture fluid and those diluted with buffer or diluted Can be used as is.
- An object to be detected is not limited at all, and may be any substance to be detected.
- virus antigens such as influenza virus, adenovirus, RS virus, HAV, HBs, HIV, norovirus, MRSA, group A streptococcus, group B streptococcus, bacterial antigens such as Legionella, toxins produced by bacteria
- virus antigens such as influenza virus, adenovirus, RS virus, HAV, HBs, HIV, norovirus, MRSA, group A streptococcus, group B streptococcus, bacterial antigens such as Legionella, toxins produced by bacteria
- examples include hormones such as mycoplasma, chlamydia trachomatis, human chorionic gonadotropin, C-reactive protein, myoglobin, cardiac troponin, various tumor markers, pesticides, environmental hormones, and other antigens. Mention may be made of antibodies.
- the present invention also provides an immunochromatographic test device including a specimen addition site formed as described above.
- the configuration of the inspection device itself may be a well-known one as described in, for example, Patent Document 1 and Patent Document 2, except that a surfactant that is in the form of a white powder is applied to the sample adding portion.
- a surfactant that is in the form of a white powder is applied to the sample adding portion.
- a nitrocellulose membrane (1) having two detection portions (3) formed on a plastic plate (6), an absorbent pad portion (5) formed of filter paper, and formed by the above method.
- the labeled part (2) and the sample addition part (4) formed of a glass fiber filter are laminated. And as shown in the figure, one end region of the absorbent pad portion (5), one end region of the nitrocellulose membrane (1), the other end region of the nitrocellulose membrane (1), and the labeling body portion One end region of (2), the other end region of the marker part (2), and one end region of the sample addition part (4) are respectively overlapped.
- a flow path is formed.
- a specimen sample in which a specimen is suspended / extracted in a specimen suspension / extraction buffer is prepared.
- a stabilized dry labeled body pad formed by the above-described method in which an antibody that reacts with an object to be antigen-antibody reacted with a colored latex particle is included.
- the sample addition section (4) of the test device further includes a labeling section (2), and further includes a detection section (3) that is solid-phased in a line using an antibody that reacts with an object to be detected as an antigen antibody. Drop the specimen sample. The specimen sample containing the detection object develops the label while moving horizontally on the membrane.
- the detection unit (3) is an antibody or antigen-binding agent that reacts with the substance to be detected and can bind to the detected substance simultaneously with the antibody on the colored latex particles or the antigen-binding fragment thereof. This is a region in which sex fragments are immobilized in a line. Other components not involved in the reaction are absorbed by the absorbent pad portion (5). In the example shown in FIG.
- detection units (3) there are two detection units (3).
- two detection units (3) such as influenza A virus and influenza B virus are used. This is for capturing each detected object.
- By providing a plurality of such detection units (3) it is possible to perform immunoassay on a plurality of types of detection objects at the same time.
- the test device of the present invention that uses latex particles to which an antibody or antigen-binding fragment thereof that reacts with an object to react with an antigen or an antigen-binding fragment is used as a stabilized dry label, the object to be detected can be measured quickly and easily.
- Influenza A virus antigens were immunized to BALB / c mice, and the spleen was removed from mice bred for a certain period of time, and the method of Keller et al. , Nature, vol, 256, p495-497 (1975)) and fused with mouse myeloma cells (P3 ⁇ 63). The obtained fused cells (hybridoma) were maintained in a 37 ° C.
- Anti-B influenza virus NP antibody Two types of purified anti-B influenza virus NP antibodies were obtained in the same manner as in (1) using influenza B virus antigen.
- An inspection device having the same configuration as that shown in FIG. 1 was used.
- a nitrocellulose membrane is cut into a 2cm x 20cm size and backed with a plastic plate with an adhesive, and an anti-influenza A virus antibody (approx. 20 cm each of another antibody) solution and anti-type B influenza virus antibody (another antibody) solution were applied and dried well under warm air to immobilize the antibody (detector).
- a filter paper having a size of 3 cm ⁇ 20 cm was stacked 5 mm on the upper end of the nitrocellulose membrane to provide an absorbent pad portion.
- a label body part was provided by overlapping the label body pad by 2 mm on the lower end of the nitrocellulose membrane, and the sample addition pad was overlapped at a position 7 mm away from the upper end of the label body pad to provide a sample addition section.
- an inspection device integrated by cutting with a cutter into a strip having a width of 5 mm was produced.
- test Example 1 and Comparative Example 1 First, the sample addition part of the test device produced as described above was impregnated with a sample developing component (100 mM Tris-HCl (pH 8.0), 1% Tween20, 0.5% BSA) and an edible red pigment (concentration 0.1%) ( Comparative Example 1). Further, the sample addition part was impregnated with a solution further containing 0.2% by mass of sodium deoxycholate (DOC) (Example 1). As a sample, physiological saline was dropped on the sample addition part, and the state of release of the food dye immediately after the sample was dropped and the state of the sample addition part after the test was observed.
- DOC sodium deoxycholate
- Example 2 and Comparative Example 2 A test device having a sample addition portion containing the sample developing component and sodium deoxycholate in the same manner as in Example 1 and Comparative Example 1 except that the solution impregnated in the sample addition portion does not contain a red food dye.
- a test device (Comparative Example 2) having (Example 2) and a sample addition portion containing only the sample developing component was produced. In each of these, an immunochromatographic test was performed using an influenza virus type B antigen, and variations in signal intensity were measured with an immunochromatographic reader (manufactured by Hamamatsu Photonics) (each n 10).
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Abstract
Description
(1) 試料添加部に常態で白色粉末状である界面活性剤を施し乾燥させることを含む、イムノクロマト法検査デバイスの試料添加部の形成方法。
(2) 前記界面活性剤が、分子量200~900の陰イオン性、非イオン性又は両性界面活性剤である(1)記載の方法。
(3) 前記界面活性剤が、デオキシコール酸及びその塩並びにコール酸及びその塩から成る群より選ばれる少なくとも1種である(1)記載の方法。
(4) 前記界面活性剤が、デオキシコール酸ナトリウムである(3)記載の方法。
(5) (1)~(4)のいずれか1項に記載の方法により形成された試料添加部を含むイムノクロマト法検査デバイス。
コール酸ナトリウム、
デオキシコール酸ナトリウム、
ラウリル硫酸ナトリウム、
スクロースモノコレート、
β-D-フラクトピラノシル-α-D-グルコピラノシドモノドデカノエート、
β-D-フラクトピラノシル-α-D-グルコピラノシドモノデカノエート、
n-オクタノイル-N-メチルグルカミド、
n-ノナノイル-N -メチルグルカミド、
n-デカノイル-N-メチルグルカミド、
n-オクチル-β-D-チオグルコピラノシド、
n-オクチル-β-D-マルトピラノシド、
n-オクチル-β-D-グルコピラノシド、
n-ノニル-β-D-チオマルトピラノシド、
n-ドデシル-β-D-マルトピラノシド、
n-デシル-β-D-マルトピラノシド、
N,N-ビス(3-D-グルコンアミドプロピル)コラミド、
N,N-ビス(3-D-グルコンアミドプロピル) デオキシコラミド、
3-[(3-コラミドプロピル)ジメチルアンモニオ]プロパンスルホン酸、
3-[(3-コラミドプロピル)ジメチルアンモニオ]-2-ヒドロキシプロパンスルホン酸、
ツビッタージェント (ZWITTERGENT )3-10デタージェント (商品名) カルビオケム製、
ツビッタージェント 3-12デタージェント (商品名) カルビオケム製、
ツビッタージェント 3-14デタージェント (商品名) カルビオケム製。
これらの界面活性剤の中でも、陰イオン性である、デオキシコール酸及びその塩並びにコール酸及びその塩から成る群より選ばれる少なくとも1種が好ましく、特に、コール酸ナトリウム、デオキシコール酸ナトリウムは、水溶解性が良く、安価であるのでより好ましい。
1.抗インフルエンザウイルスモノクローナル抗体の作製
(1)抗A型インフルエンザウイルスNP抗体
A型インフルエンザウイルス抗原をBALB/cマウスに免疫し、一定期間飼育したマウスから脾臓を摘出し、ケラーらの方法(Kohler et al., Nature, vol, 256, p495-497(1975))によりマウスミエローマ細胞(P3×63)と融合した。得られた融合細胞(ハイブリドーマ)を、37℃インキュベーター中で維持し、A型インフルエンザウイルスNP抗原を固相したプレートを用いたELISAにより上清の抗体活性を確認しながら細胞の純化(単クローン化)を行った。取得した該細胞2株をそれぞれプリスタン処理したBALB/cマウスに腹腔投与し、約2週間後、抗体含有腹水を採取した。得られた腹水からプロティンAカラムを用いたアフィニティークロマトグラフィーにより、それぞれIgGを精製し、2種類の精製抗A型インフルエンザウイルスNP抗体を得た。
B型インフルエンザウイルス抗原を用い、(1)と同様の方法で、2種類の精製抗B型インフルエンザウイルスNP抗体を得た。
精製抗A型インフルエンザウイルスNP抗体及び精製抗B型インフルエンザウイルスNP抗体のうちそれぞれ1種類ずつを使用した。青色ラテックス粒子に抗A型インフルエンザウイルス抗体を共有結合させ、浮遊液に懸濁し、ソニケーションを行って充分に分散浮遊させた抗A型ラテックス浮遊液を調製した。また、同様に抗B型インフルエンザウイルス抗体を共有結合させた抗B型ラテックス浮遊液を調製した。抗A型ラテックス浮遊液と抗B型ラテックス浮遊液とを混合し、大きさが20cm×1cmのガラス繊維に塗布し、温風下で良く乾燥させて、乾燥混合物を形成した標識体パッドを作製した。
大きさが2.0cm×20cmのガラス繊維を使用した。
検査デバイスは、図1に示すものと同様の構成のものを用いた。ニトロセルロースメンブランを2cm×20cmの大きさに裁断し接着剤がついたプラスチック板でバッキングした、下端から 0.6cmと1.0cmの位置に約1mm幅になる量の抗A型インフルエンザウイルス抗体(上記と別の抗体)液、並びに抗B型インフルエンザウイルス抗体(上記と別の抗体)液を各々20cm塗布し、温風下で良く乾燥させて抗体を固相化した(検出部)。次に、3cm×20cmの大きさの濾紙をニトロセルロースメンブランの上端に5mm重ねて吸収パッド部を設けた。更に、標識体パッドをニトロセルロースメンブランの下端に2mm重ねて標識体部を設け、更に、試料添加パッドを標識体パッドの上端から7mm離れた位置に合わせて重ね、試料添加部を設けた。次いで、カッターで幅5mmの短冊に裁断して一体化された検査デバイスを作製した。
実施例1及び比較例1
まず、上記のとおり作製した検査デバイスの試料添加部に、検体展開成分(100mM Tris-HCl(pH8.0)、1%Tween20、 0.5%BSA)および食用赤色色素(濃度0.1%)を含浸した(比較例1)。また、これらに0.2質量%のデオキシコール酸ナトリウム(DOC)をさらに含む溶液を試料添加部に含浸させた(実施例1)。試料として生理食塩水を試料添加部に滴下し、試料滴下直後の食用色素の放出の様子と、試験終了後の試料添加部の様子を観察した。その結果、試験直後の色素の放出は、デオキシコール酸ナトリウム含有の試料添加部を持つ検査デバイスで明らかに放出量が多かった(図2)。また試験終了後の試料添加部においても、デオキシコール酸ナトリウム含有サンプルでは色素の色残りが少なかった(図3)。以上からデオキシコール酸ナトリウムが検体添加部に含有されることで検体展開成分の放出が改善し、それに伴い食用色素の放出も改善したものと推察される。なお、図面は白黒なので差がわかりにくいかもしれないが、カラー写真であれば、図2及び図3における実施例1と比較例1の差異は肉眼で明瞭に理解できる。
試料添加部に含浸させた溶液が、赤色食用色素を含まないことを除き、実施例1及び比較例1と同様にして、上記検体展開成分とデオキシコール酸ナトリウムを含む試料添加部を有する検査デバイス(実施例2)と、検体展開成分のみを含む試料添加部を有する検査デバイス(比較例2)を作製した。これらのそれぞれにて、インフルエンザウイルスB型の抗原を使用してイムノクロマト試験を行い、シグナル強度のばらつきをイムノクロマトリーダー(浜松フォトニクス社製)で測定した(各n=10)。
Claims (5)
- 試料添加部に常態で白色粉末状である界面活性剤を施し乾燥させることを含む、イムノクロマト法検査デバイスの試料添加部の形成方法。
- 前記界面活性剤が、分子量200~900の陰イオン性、非イオン性又は両性界面活性剤である請求項1記載の方法。
- 前記界面活性剤が、デオキシコール酸及びその塩並びにコール酸及びその塩から成る群より選ばれる少なくとも1種である請求項1記載の方法。
- 前記界面活性剤が、デオキシコール酸ナトリウムである請求項3記載の方法。
- 請求項1~4のいずれか1項に記載の方法により形成された試料添加部を含むイムノクロマト法検査デバイス。
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WO2024122616A1 (ja) * | 2022-12-07 | 2024-06-13 | デンカ株式会社 | イムノクロマト法検査デバイスの試料展開部の形成方法およびイムノクロマト法検査デバイス |
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CN109073643A (zh) | 2018-12-21 |
EP3435081A1 (en) | 2019-01-30 |
KR20180123511A (ko) | 2018-11-16 |
US20190101532A1 (en) | 2019-04-04 |
KR20240031431A (ko) | 2024-03-07 |
MY191701A (en) | 2022-07-08 |
EP3435081A4 (en) | 2019-10-23 |
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