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Sionex Corporation Granted Radioactive Device Approval

BEDFORD, Mass., November 21, 2005 - Sionex Corporation, a high technology company focused on commercializing breakthrough chemical and biological sensor chips and systems based on its proprietary microDMx™ detection technology, today announced that its SVAC (Sionex Value Added Component) product family containing the microDMx™ sensor chip has been approved as an approved radioactive device allowing the distribution to end-users and customers not holding any radioactive license.

"This will now allow Sionex to sell its SVAC products, including its technology demonstrator and evaluation system, to anybody interested in incorporating our microDMx technology into their end-user products without the requirement to hold any radioactive license." said Anthony D. Bashall vice president of marketing and business development at Sionex, furthermore, "This will allow Sionex to expand its range of customers beyond the chemical/biological threat and explosive detection markets already served."

Sionex's microDMx technology consists of a micro-fabricated chip that operates at atmospheric pressure and acts as a programmable chemical filter. This allows specific chemical and biological compounds to be detected and identified.

Sionex has microDMx evaluation units with a number of major OEM manufacturers and institutions who are looking at its potential use for process control, building security, chemical and biological threat detection as well as medical diagnostics and life science applications.

About Sionex Corporation
Sionex Corporation is a high technology company focused on commercializing breakthrough chemical and biological sensor chips and systems based on its proprietary microDMx™ detection technology. Sionex maintains its worldwide headquarters and laboratories in Bedford, Massachusetts, close to Boston with its commercial, technology and communications infrastructure. The Company is privately held and was founded in 2001 with patented technology exclusively licensed from The Charles Stark Draper Laboratory. For addition information contact Sionex at www.sionex.com or by calling +1 (781) 457-5400 or fax to +1 (781) 457-5399.

EDITORIAL CONTACTS:
Eric Kirleis
(781) 457-5416
ekirleis@sionex.com

Agency Contact:
Doug Forsyth, Alchymia Communications® LLC
(541) 482-8744
df@alchymiacomm.com

microDMx™ is a trademark of Sionex Corporation