Membrane strip biosensor system for point-of-care testing
First Claim
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1. A membrane strip biosensor system comprising:
- (a) a first group of membrane pads comprising;
(i) a first membrane pad for sample application,(ii) a second membrane pad for release of a detection binding component, said second membrane pad comprises a tracer-linked binding component specific for and able to bind to an analyte in said sample to form an analyte/binding component complex,(iii) a third membrane pad that is a signal generation membrane pad with an immobilized binding component specific for and able to capture said analyte/binding component complex,(iv) a fourth membrane pad for absorption of flow medium;
(b) a second group of membrane pads comprising;
(vi) a fifth membrane pad for the supply of a substrate solution,(vii) a sixth membrane pad for absorption of excess substrate solution, and(c) substrate solution;
wherein the system has a cross-arrangement of the two groups of membrane pads;
said first group of membrane pads is arranged in a first flow direction wherein said first membrane pad is partially superimposed and fixed at an end of said second membrane pad, and said second membrane pad and said fourth membrane pad are partially superimposed and fixed one at each end of the third membrane pad, and wherein said sample is applied to said first membrane pad and flows laterally along said second and third membrane pads to said fourth membrane pad to comprise a first flow reaction; and
said second group of membrane pads is arranged in a second flow direction perpendicular to the first flow direction, wherein said fifth and sixth membrane pads are partially superimposed and fixed at both lateral sides of the third membrane pad to form a pathway for a second flow reaction.
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Abstract
The present invention relates to a biosensor for point-of-care testing (POCT) whose detection sensitivity was remarkably improved by introducing to membrane strip chromatographic assay system a successive cross-flow procedure for immune reaction and enzymatic reaction. The present invention relates to a membrane strip biosensor system that comprises
- (a) a membrane pad (10) for sample application,
- (b) a membrane pad (20) for release of detection binding component, wherein the membrane pad (20) contains label-linked binding component for detection in a dry state,
- (c) a signal generation membrane pad (30) with immobilized binding component for capture,
- (d) a membrane pad (40) for absorption of vertical flow medium,
- (e) a membrane pad (50) for the supply of substrate solution for enzyme,
- (f) a membrane pad (60) for absorption of horizontal flow medium and
- (g) substrate solution,
wherein the system has a cross-arrangement of two groups of the membrane pads,- (I) one group of vertically arranged pads, wherein the pad (10) is partially superimposed and fixed in length at the end of the pad (20), and the pad (20) and the pad (40) are partially superimposed and fixed in length at the both ends of the signal generating membrane pad (30), respectively; and
- (II) the other group of horizontally arranged pads, wherein the pad (50) and pad (60) are, at the time of signal generation, partially superimposed and fixed at the both lateral sides of the signal generation membrane pad (30), respectively.
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Citations
15 Claims
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1. A membrane strip biosensor system comprising:
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(a) a first group of membrane pads comprising; (i) a first membrane pad for sample application, (ii) a second membrane pad for release of a detection binding component, said second membrane pad comprises a tracer-linked binding component specific for and able to bind to an analyte in said sample to form an analyte/binding component complex, (iii) a third membrane pad that is a signal generation membrane pad with an immobilized binding component specific for and able to capture said analyte/binding component complex, (iv) a fourth membrane pad for absorption of flow medium; (b) a second group of membrane pads comprising; (vi) a fifth membrane pad for the supply of a substrate solution, (vii) a sixth membrane pad for absorption of excess substrate solution, and (c) substrate solution; wherein the system has a cross-arrangement of the two groups of membrane pads; said first group of membrane pads is arranged in a first flow direction wherein said first membrane pad is partially superimposed and fixed at an end of said second membrane pad, and said second membrane pad and said fourth membrane pad are partially superimposed and fixed one at each end of the third membrane pad, and wherein said sample is applied to said first membrane pad and flows laterally along said second and third membrane pads to said fourth membrane pad to comprise a first flow reaction; and said second group of membrane pads is arranged in a second flow direction perpendicular to the first flow direction, wherein said fifth and sixth membrane pads are partially superimposed and fixed at both lateral sides of the third membrane pad to form a pathway for a second flow reaction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A biosensor membrane strip system having a plurality of membrane pads in fluid communication, said system comprising:
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(a) an immuno-strip comprising (1) a sample application membrane pad; (2) a detection reagent-releasing membrane pad positioned to receive sample from said sample application membrane pad, said detection reagent-releasing membrane pad comprising a mobilizable labeled specific binding reagent for binding to an analyte in said sample to form an analyte/detection reagent complex, wherein said mobilizable labeled detection reagent is freely soluble or dispersible in said sample and is free to move with said sample along said detection reagent-releasing membrane pad, whereby it is transported by said sample from said detection reagent-releasing membrane pad to a signal generation membrane pad; (3) a signal generation membrane pad downstream of said detection reagent-releasing membrane pad, said signal generation membrane pad comprising an immobilized capture reagent for binding to said analyte/detection reagent complex; and (4) a first absorbent membrane pad downstream of said signal generation membrane pad; wherein said sample application membrane pad, detection reagent-releasing membrane pad and signal generation membrane pad overlap at their adjacent ends to provide effective contact between the pads thereby forming a first flow path; and (b) an enzyme substrate solution flow strip comprising; (5) a substrate solution membrane pad; and (6) a second absorbent membrane pad, wherein said substrate solution membrane pad and said second absorbent membrane pads, when brought into fluid communication with said signal generation membrane pad of said immunostrip, form a second flow path that is different from the first flow path. - View Dependent Claims (14, 15)
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Specification