Polyhydroxyacids

Thus, an alkene can be considered as a masked ketone that can be unmasked by ozonolysis. This is illustrated by the synthesis of N-acetylneuraminic acid via the ozonolysis of the precursor acrylic acid in THF/aqueous media (Eq. 3.22). The use of aqueous media facilitated the solubility of the polyhydroxyacids.92... 

Organic acids are added to some foods in order to prevent sedimentation or darkening thus, citric, malic, phosphoric, and ascorbic acid are used to reduce or delay enzymatic browning. Melanin formation following production of a quinone is a pH-dependent process (the rate of the former process increases with increasing pH) (8). Polyhydroxyacids such as citric and malic acid... 

Gogolewski, S., Jovanovic, M., Perren, S.M., Dillon, J.G., Hughes, M.K., 1993. Tissue response and in vivo degradation of selected polyhydroxyacids polylactides (PLA), poly(3-hydroxybutyrate) (PHB), and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB/HV). Journal of Biomedical Materials Research 27, 1135—1148. 

Another new family of biodegradable polyesters containing a hydroxyacid repetitive unit is that of the long chain polyhydroxyacid or polyhydroxyfattyacid. 

The polymer synthesis of long chain polyhydroxyacids can be performed either in bulk via condensation reactions or by the ring-opening polymerisation of lactones/ macrolactones obtained by co-hydroxyfattyacid cyclisation [30]. 

The Effect of Melt-Processing on the Degradation of Selected Polyhydroxyacids - Polylactides, Polyhydroxybutyrate, and... 

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