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Clinical Chemistry 24: 1343-1350, 1978;
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Clinical Chemistry, Vol 24, 1343-1350, Copyright © 1978 by American Association for Clinical Chemistry

Multilayer film elements for clinical analysis: applications to representative chemical determinations

RW Spayd, B Bruschi, BA Burdick, GM Dappen, JN Eikenberry, TW Esders, J Figueras, CT Goodhue, DD LaRossa, RW Nelson, RN Rand and TW Wu

Using the general concept of a dry multilayer analytical element, we can change chemical procedures and configurations to assay several blood components. In the assay of serum urea nitrogen, urease in the reagent layer catalyzes the hydrolysis of urea. A semipermeable membrane excludes aqueous base, but allows ammonia to diffuse to an underlying indicator layer. For the amylase determination, the enzyme hydrolyzes a dyed-starch substrate coated on top of the spreading layer; this produces small fragments, which diffuse to a registration layer. The increase of absorbance at 540 nm is correlated with amylase activity. Bilirubin complexes with a cationic polymer at the interface between the spreading and reagent layers. The direct reading at 460 nm allows determination of total bilirubin in the range 1 to 500 mg/liter. Tirglycerides are hydrolyzed in the spreading layer, and the resulting soluble glycerol readily diffuses into the reagent layer, where it is phosphorylated and subsequently oxidized by glycerophosphate oxidase to yield dihydroxyacetone phosphate and hydrogen peroxide. Peroxidase catalyzes production of a color commensurate with the hydrogen peroxide produced.


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