Abstract: There is disclosed a dry analytical element for .alpha.-amylase in a fluid sample which comprises the analytical element including a starch capable of forming a complex with iodine, an iodine compound and an oxidizing agent, and the iodine compound and the oxidizing agent are disposed in the element so that iodine may be liberated therefrom when the fluid sample is brought into contact with the analytical element.The analytical element of this invention enables an easy, prompt and accurate dry quantitative analysis of a component in a fluid sample, especially a biological fluid sample by the use of visible light with the aid of a spectrophotometer.

Abstract: There is disclosed an analytical element comprising a support; a reagent layer which is positioned on one side of the support and contains a reagent reactive with a component in a fluid sample; and a porous spreading layer which is positioned on the reagent layer on the opposite side to that of the support for permitting the component in the fluid sample to permeate into the reagent layer; wherein at least one layer contains 5% by weight or more of a polymer formed by, (i) a copolymerizable ethylenically unsaturated acid with (ii) a copolymerizable ethylenically unsaturated monomer.The analytical element according to the present invention can determine a component in a fluid sample quantitatively.

Abstract: An analytical element for use in analysis of a component in an aqueous fluid, comprising(a) a light-transmissive support;(b) a reagent layer; and(c) a porous spreading layer,being characterized in that the reagent layer contains a substantially water-dispersible copolymer obtained by copolymerization of at least one copolymerizable monomer, which is water soluble and has a nonionizable group in the side chain, with at least one copolymerizable hydrophobic monomer.The analytical element of this invention is good with less formation of fogging, higher in color forming density and indicating higher sensitivity.