EurekAlert -- Chemists are reporting a major advance toward developing a safer, fully-synthetic version of heparin, the widely used blood thinner now produced from pig intestines. The U. S. Food and Drug Administration last spring linked contaminated batches of the animal-based product, imported from China, to more than 80 deaths and hundreds of allergic reactions among patients exposed to the drug for kidney dialysis and other conditions. Described here today at the ACS’s 236th National Meeting, the purer, non-animal version could improve the drug’s safety and bolster regulatory control of its manufacture, the researchers say. Scientists expect demand for heparin, which prevents blood clots, to increase in the future due to rising rates of diabetes, heart disease, and other health complications linked to sedentary lifestyles. Global heparin sales total about $4 billion annually.