Commercial PHB and the extracted polymer from Calothrix scytonemicolo TISTR 8095 analyzed by nuclear magnetic resonance (NMR): ^-NMR (BRUKER, chemical shift 0-14 ppm) (Verlinden, Hill et al. 2011) and 13C-NMR (BRUKER, chemical shift 0-230 ppm) (Khardenavis, Vaidya et al. 2009) were conducted by Department of Chemistry, Faculty of Science, Chulalongkorn University.