title: Agroindustrial residues and energy crops for the production of hydrogen and poly-β-hydroxybutyrate via photofermentation.
abstract: The present study was aimed at assessing the biotransformation of dark fermented agroindustrial residues and energy crops for the production of hydrogen and poly-β-hydroxybutyrate (PHB), in lab-scale photofermentation. The investigation on novel substrates for photofermentation is needed in order to enlarge the range of sustainable feedstocks. Dark fermentation effluents of ensiled maize, ensiled giant reed, ensiled olive pomace, and wheat bran were inoculated with Rhodopseudomonas palustris CGA676, a mutant strain suitable for hydrogen production in ammonium-rich media. The highest hydrogen producing performances were observed in wheat bran and maize effluents (648.6 and 320.3mLL(-1), respectively), both characterized by high initial volatile fatty acids (VFAs) concentrations. Giant reed and olive pomace effluents led to poor hydrogen production due to low initial VFAs concentrations, as the original substrates are rich in fiber. The highest PHB content was accumulated in olive pomace effluent (11.53%TS), ascribable to magnesium deficiency.
authors.affiliation: Institute of Life Sciences, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, 56127 Pisa, Italy.
authors.forename: Elisa
authors.initials: E
authors.lastname: Corneli
authors.affiliation: Institute of Chemistry of Organometallic Compounds (ICCOM), CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy; Department of Agrifood Production and Environmental Sciences, University of Florence, via Maragliano 77, 50144 Firenze, Italy. Electronic address: alessandra.adessi@unifi.it.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Adessi
authors.affiliation: Institute of Life Sciences, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, 56127 Pisa, Italy.
authors.forename: Federico
authors.initials: F
authors.lastname: Dragoni
authors.affiliation: Institute of Life Sciences, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, 56127 Pisa, Italy; CRIBE - Centro di Ricerche Interuniversitario Biomasse da Energia, Via Vecchia Livornese 748, 56122 Pisa, Italy.
authors.forename: Giorgio
authors.initials: G
authors.lastname: Ragaglini
authors.affiliation: Institute of Life Sciences, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, 56127 Pisa, Italy; CRIBE - Centro di Ricerche Interuniversitario Biomasse da Energia, Via Vecchia Livornese 748, 56122 Pisa, Italy.
authors.forename: Enrico
authors.initials: E
authors.lastname: Bonari
authors.affiliation: Institute of Chemistry of Organometallic Compounds (ICCOM), CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy; Department of Agrifood Production and Environmental Sciences, University of Florence, via Maragliano 77, 50144 Firenze, Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: De Philippis
mesh_terms: D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D018556:Crops, Agricultural / Q000737:chemistry / Q000378:metabolism*; D004043:Dietary Fiber / Q000378:metabolism; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005285:Fermentation; D006859:Hydrogen / Q000378:metabolism*; D006885:Hydroxybutyrates / Q000378:metabolism*; D008274:Magnesium / Q000378:metabolism; D011091:Polyesters / Q000378:metabolism*; D011422:Propionates / Q000378:metabolism; D012241:Rhodopseudomonas / Q000378:metabolism*; D014866:Waste Products; D003313:Zea mays / Q000378:metabolism; D000094122:Polyhydroxybutyrates
chemical_list: D004043:Dietary Fiber; D005232:Fatty Acids, Volatile; D006859:Hydrogen; D006885:Hydroxybutyrates; D008274:Magnesium; D011091:Polyesters; D011422:Propionates; D014866:Waste Products; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates; C029658:propionic acid
keywords: Biological hydrogen production; Giant reed; Maize; Olive pomace; Poly-β-hydroxybutyrate; Wheat bran