Shelf-stable milk calibration standards
AssigneeFlockton Analytical Management Inc.
InventorJeffrey D. Turner
Life of this patent
Estimating the term…
Abstract
A calibration standard for calibrating machines which count the somatic cells in a milk sample, comprises an aqueous dispersion of microbeads bearing a fluorescent dye, a suspending agent, and an electrolyte; the dye has an excitation wavelength below 580 nm and a fluorescence emission wavelength in the range of 550 to 660 nm, with the excitation wavelength being at least 10 nm below the emission wavelength; the microbeads are present in a predetermined number per unit volume of dispersion; typically the standard contains 1.times.10.sup.5 to 9.times.10.sup.5 beads/ml.
Claims8
A shelf-stable milk calibration standard of non-milk origin comprising an aqueous dispersion of microbeads bearing a fluorescent dye, a suspending agent effective to maintain said microbeads in a dispersed state in said dispersion and an electrolyte in an amount to provide the dispersion with an electrical conductivity which is substantially at least that of milk said dye having an excitation wavelength below 580 nm and having a fluorescence emission wavelength in the range of 550 to 660 nm, with said excitation wavelength being at least 10 nm below said emission wavelength, and said microbeads being present in a predetermined number per unit volume of the dispersion.
Dependencies are inferred from the claim text.