title: Production of Poly (3-Hydroxybutyric Acid) by Ralstonia eutropha in a Biocalorimeter and its Thermokinetic Studies.
abstract: Bioplastic production from microbial sources is an emerging area which provides opportunities even to convert the wastes into bioplastics. Poly (3-hydroxybutyric acid), commonly called as PHB, is a bioplastic, which is stored as intracellular cytoplasmic inclusions in microorganisms. The objectives of this study are to calorimetrically monitor the PHB production and evaluate the thermokinetic data in a bioreaction calorimeter (BioRC1e). Thus, a well-known PHB-producing bacteria Ralstonia eutropha was selected for batch process in a bioreaction calorimeter. The metabolic heat generated was found to be correlated with the biomass, substrate consumption, oxygen uptake rate (OUR), carbon dioxide evolution rate (CER) and PHB production. The OUR pattern explained the oxidative metabolism of the strain R. eutropha. The heat yields due to biomass and glucose consumption during PHB production were found to be 12.56 and 13.56 kJ/g, respectively. The oxycalorific value obtained for the PHB production was 443.80 kJ/mol of O2. The concentration of PHB obtained in BioRC1e was 4.33 g/L with a production rate of 0.09 g/L/h. The chemical structure of the extracted PHB by R. eutropha was confirmed using fourier transform infrared spectroscopy (FT-IR) and (1)H and (13)C nuclear magnetic resonance (NMR) analysis.
authors.affiliation: Chemical Engineering Department, Central Leather Research Institute (CLRI), Adyar, Chennai, Tamil Nadu, India.
authors.forename: Subramanian Mohanakrishnan
authors.initials: SM
authors.lastname: Anusha
authors.affiliation: Chemical Engineering Department, Central Leather Research Institute (CLRI), Adyar, Chennai, Tamil Nadu, India.
authors.forename: Santharam
authors.initials: S
authors.lastname: Leelaram
authors.affiliation: Chemical Engineering Department, Central Leather Research Institute (CLRI), Adyar, Chennai, Tamil Nadu, India. msuri1@vsnl.com.
authors.forename: Mahadevan
authors.initials: M
authors.lastname: Surianarayanan
mesh_terms: D020155:3-Hydroxybutyric Acid / Q000096:biosynthesis* / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry*; D018533:Biomass; D019149:Bioreactors; D002151:Calorimetry; D020118:Cupriavidus necator / Q000201:enzymology / Q000378:metabolism*; D005947:Glucose / Q000737:chemistry; D007700:Kinetics; D011091:Polyesters / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; D005947:Glucose; D020155:3-Hydroxybutyric Acid
keywords: Bioplastic; Bioreaction calorimeter; Oxycalorific value; Poly (3-hydroxybutyric acid) (PHB); Ralstonia eutropha