Abstract: A stable triglyceride assay solution for use with a chromogen system is comprised of a solution buffered with a Zwitterionic buffering agent and/or TRIS and stabilized with sortibol, gelatin, and ammonium sulfate. Solution pH is in the range of from 6.8 to 8.0. The functional enzymes are lipase, glyercol kinase, and glycerol phosphate oxidase. The preferred chromogen system is based on the inclusion of 4-aminoantipyrine for use in combination with oxidase to yield a detectable chromogen compound.

Abstract: There is provided an assay method for determining the concentration of magnesium ions in biological fluids. The method comprises the introduction of a sample of biological fluid to a magnesium-free assay solution containing at least one reactant and an enzyme capable of catalyzing a reaction with at least one reactant wherein the enzyme activity, and hence the rate of reaction, is partially or totally dependent on and correlatable to the concentration of magnesium that is present. The rate of reaction is measured by monitoring the loss of a detectable reactant or the formation of a detectable product.

Abstract: A method is disclosed for preparing a soluble stable enzyme. The method comprises the steps of reacting in a liquid media an enzyme with a polymer having pendant groups capable of covalently bonding with pendant groups on the enzyme. The enzyme and polymer are mixed with at least one composition which affects the activity of the enzyme. Such a composition can be selected from the enzyme substrate, product of the enzyme substrate reaction, an activator for the enzyme and/or inhibitor for the enzyme. In addition, a composition can be added which can also competitively react with the available pendant groups of the polymer.