Yes, we offer two zinc ion quantitation kits: Amplite^® Fluorimetric Zinc Ion Quantitation Kit and Amplite^® Colorimetric Zinc Ion Quantitation Kit. Both kits provide a convenient and robust method for detecting zinc ion concentration in different types of biological samples; e.g. serum, plasma and urine. Our fluorimetric kit utilizes Metal Fluor^™ Zn 520 (Ex/Em = 485/525 nm). Upon binding to zinc, Metal Fluor^™ Zn 520 exhibits a significant fluorescence enhancement, greater than 200-300 folds. Our colorimetric kit utilizes Zn-620^™. In a zinc-free solution, the absorbance of Zn-620^™ is at 480 nm. When bound to zinc, Zn-620^™ enhances its absorption to 620 nm. Both probes have high Zn²⁺-specificity with little responses to other metals, including Ca^2+, Mg^2+, Mn^2+, and Cu²⁺.