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EPA Approves XDS-CALUX(R) as Alternate Dioxin Test Method 4435
Date:5/30/2008

DURHAM, N.C., May 30 /PRNewswire/ -- Dr. George C. Clark of Xenobiotic Detection Systems (XDS) and Dr. Michael Denison at the University of California Davis, with support from the Superfund Basic Research Program, have developed a rapid and inexpensive recombinant cell bioassay system for the detection and relative quantification of dioxin-like chemicals. Dioxin-like chemicals are some of the most toxic chemicals known.

The CALUX(R) by XDS (Chemical Activated LUciferase Gene Expression) system has recently been published and is posted under "New Methods" on the SW-846 website. In March 2008, the EPA's Office of Solid Waste (OSW) Organic Methods Workgroup formally reviewed and approved Method 4435 for inclusion into Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, also known as SW-846. The XDS-CALUX system consists of a unique sample processing method linked with a sensitive gene expression cell bioassay detection system providing unique sensitivity and selectivity for quantifying dioxin-like chemicals.

The XDS-CALUX(R) bioassay costs are 40%-70% lower than the traditional High Resolution Gas Chromatography/Mass Spectrometry (HR GC/MS) that was the old singular analysis standard. Xenobiotic Detection Systems Method 4435 provides an excellent screening tool to rapidly detect and quantify these ubiquitous and toxic environmental contaminants.

"This approval exemplifies the assay's versatility and is another major step for XDS," says President of XDS, Dr. George Clark. "Having been certified in the European Union since 2002 to primarily monitor feed and food it is wonderful to receive accreditation here in the U.S. Our screening analysis method is faster, far more affordable, and in many cases even more sensitive than the traditional HR GC/MS. The EPA's approval will allow us to better serve our clients and safeguard the environment from these toxic contaminants."

Research Institutes Worldwide using XDS-CALUX(R) Technology includes the United States: US FDA and University of California Davis. Asia: Hiyoshi Corporation of Japan, Cheng-Shiu University, Taiwan. Europe: Scientific Institute of Public Health, Brussels, Belgium, Federal Feed Laboratory, Tervuren, Belgium, and the National Veterinary Research Institute, Pulawy, Poland.

Development of the XDS-CALUX(R) technology was funded in part by Superfund Basic Research Program Grant (ES04699), and by Small Business Innovation Research Grants from the National Institute of Environmental Health Sciences (ES 08372-01 and ES 08372-02).

Additional information: XDS (http://www.dioxins.com) or call 1-888-D-I-O-X-I-N-S

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