Pharmaceutical

synthetic heparin in development

Robert Linhardt, a scientist at Troy, New York-based Rensselaer Polytechnic Institute, is leading a team of researchers who have developed a fully synthetic version of the blood thinner heparin. While the group has only produced a few milligrams of the substance, it is the first step in eliminating the risk of contamination currently associated with the drug, which is manufactured primarily from pig intestines.

Linhardt was among the researchers who discovered the source of tainted heparin that was responsible for at least 149 deaths since the beginning of 2007. Manufacturer Baxter International, which supplies about half of the heparin used in the U.S., recalled its supplies of heparin made in China after more than 80 patients suffered serious allergic reactions and death following its use.

According to a report by Bloomberg News Service, Chinese pig farms that provide source material for heparin are not monitored by the U.S. Food & Drug Administration, which increases the risk for contamination. Continued use of traditional heparin products manufactured in these facilities leaves the door open for another contamination event, Linhardt says in the Bloomberg report.

In addition to Baxter’s product, a smaller scale contamination problem was reported with the Lovenox heparin medicine manufactured by Sanofi-Aventis, according to a report by Reuters.

Linhardt presented his team’s synthetic heparin results at the recent American Chemical Society meeting, according to Reuters, where he told those in attendance that today’s heparin manufacturing methods are “simply unsafe.”

Scientists are working on creating larger quantities of the synthetic heparin, which Linhardt hopes will reach human clinical trials in five years, Reuters reports.