Dry analytical element for immunoassay

• US 20030054429A1
• Filed: 09/03/2002
• Published: 03/20/2003
• Est. Priority Date: 09/07/2001
• Status: Abandoned Application

• Current Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Nakamura, Kentaro, Kawasaki, Kazuya, Seshimoto, Osamu
• Application Number:
  US10/234,541
• Publication Number:
  US 20030054429A1
• Time in Patent Office: Days
• US Class Current: 435/14
• CPC Class Codes: G01N 33/558 using diffusion or migration of antigen or antibody immunochromatographic test strips G01N33/54387
• CPC Class Codes: G01N 33/66 involving blood sugars, e.g. galactose

Abstract

A dry analytical element for immunoassay that is not affected by maltose internally caused by a test sample and has high accuracy is provided. In the analytical element, either (1) fragmentation speed of the maltose to glucose is made larger (a first aspect) or (2) the maltose is removed before it reaches a reagent layer (a second aspect).

Claims

1. A dry analytical element for immunoassay provided with at least a reagent layer containing an enzyme that decomposes maltose to glucose, a water permeable substrate layer containing a non-diffusible substrate, an immunoreactive layer containing a kind of molecule necessary for immunoreaction on a support in this order, wherein a content of the enzyme that decomposes maltose to glucose is an amount capable of decomposing maltose internally caused by a test sample to glucose within less than three minutes.

2. A dry analytical element for immunoassay provided with at least a reagent layer containing an enzyme that decomposes maltose to glucose, a water permeable substrate layer containing a non-diffusible substrate, an immunoreactive layer containing a kind of molecule necessary for immunoreaction on a support in this order, wherein a layer that removes maltose internally caused by a test sample is further provided on upside of the reagent layer.