(R) - (-) -1,2-Propanediol (Standard) is the analytical standard of (R) - (-) -1,2-Propanediol. This product is intended for research and analytical applications. (R) - (-) -1,2-Propanediol is a (R) -enantiomer of 1,2-Propanediol that produced from glucose in Escherichia coli expressing NADH-linked glycerol dehydrogenase genes[1].