3-hydroxy Decanoic acid is a hydroxy fatty acid and the predominant monomer in methyl-branched poly(3-hydroxyalkanoate) (PHA) polymers produced by P. putida CA-3. It is present in LPS from the H. pylori strain SS1 and in the lipid A component of clinical isolates of P. aeruginosa isolated from patients with cystic fibrosis but not the environment or patients with other conditions. 3-hydroxy Decanoic acid inhibits mitotic progression of O. virens pollens via impairment of plasma membrane function. It also induces a reversible shape change of the membrane crenation in human erythrocytes. [Matreya, LLC. Catalog No. 1727]