  Improving effect of metal and oxide nanoparticles encapsulated in porous silica on fermentative biohydrogen production by Clostridium butyricum.Beckers, Laurent  ; Hiligsmann, Serge ; Lambert, Stéphanie et alin Bioresource Technology (2013), 133C This paper investigated the enhancement effect of nanometre-sized metallic (Pd, Ag and Cu) or metallic oxide (Fe(x)O(y)) nanoparticles on fermentative hydrogen production from glucose by a Clostridium ... [more ▼] This paper investigated the enhancement effect of nanometre-sized metallic (Pd, Ag and Cu) or metallic oxide (Fe(x)O(y)) nanoparticles on fermentative hydrogen production from glucose by a Clostridium butyricum strain. These nanoparticles (NP) of about 2-3nm were encapsulated in porous silica (SiO(2)) and were added at very low concentration (10(-6)molL(-1)) in batch hydrogen production test. The cultures containing iron oxide NP produced 38% more hydrogen with a higher maximum H(2) production rate (HPR) of 58% than those without NP or with silica particles only. The iron oxide NP were used in a 2.5L sequencing-batch reactor and showed no significant effect on the yields (established at 2.2mol(hydrogen)mol(glucose)(-1)) but an improvement of the HPR (+113%, reaching a maximum HPR of 86mL(hydrogen)L(-1)h(-1)). These results suggest an improvement of the electron transfers trough some combinations between enzymatic activity and inorganic materials. [less ▲] Detailed reference viewed: 34 (5 ULg) Influence of steam explosion on physico-chemical properties and hydrolysis rate of pure cellulose fibersJacquet, Nicolas ; Vanderghem, Caroline ; Danthine, Sabine et alin Bioresource Technology (2012), 121(221-227), The aim of the present study is to compare the effect of different steam explosion treatments on physicochemical properties and hydrolysis rate of a pure bleached cellulose. The results showed that ... [more ▼] The aim of the present study is to compare the effect of different steam explosion treatments on physicochemical properties and hydrolysis rate of a pure bleached cellulose. The results showed that moderate steam explosion treatments (severity factor below 5.2) did not improve the enzymatic hydrolysis rate of the cellulose fibers. The characterization of the obtained samples showed an increase of the cellulose accessibility coupled with an increase of the overall crystallinity of the substrate. In these conditions, the higher accessibility is counterbalanced by the increased crystallinity. Indeed, a greater proportion of the substrat is accessible by only a fraction of the enzymatic complex (exo-glucanases) activities. When the severity factor reached 5.2, a decrease of the cellulose enzymatic hydrolysis rate was observed. In this case, TGA analysis showed an increase of the char level at the end of the pyrolysis which traduced an important thermal degradation of the samples. The thermal degradation of cellulose lead to an important change in substrate composition, which induced a decrease of the cellulose ratio available for hydrolysis and caused a decrease of the hydrolysis yields. [less ▲] Detailed reference viewed: 45 (16 ULg)Study of the interactive effect of temperature and pH on exopolysaccharide 3 production by Enterobacter A47 using multivariate statistical analysis; ; et al in Bioresource Technology (2012) Detailed reference viewed: 3 (0 ULg)Comparative study of biological hydrogen production by pure strains and consortia of facultative and strict anaerobic bacteriaHiligsmann, Serge ; Masset, Julien ; Hamilton, Christopher et alin Bioresource Technology (2011), 102 In this paper, a simple and rapid method was developed in order to assess in comparative tests the production of binary biogas mixtures containing CO2 and another gaseous compound such as hydrogen or ... [more ▼] In this paper, a simple and rapid method was developed in order to assess in comparative tests the production of binary biogas mixtures containing CO2 and another gaseous compound such as hydrogen or methane. This method was validated and experimented for the characterisation of the biochemical hydrogen potential of different pure strains and mixed cultures of hydrogen-producing bacteria (HPB) growing on glucose. The experimental results compared the hydrogen production yield of 19 different pure strains and sludges : facultative and strict anaerobic HPB strains along with anaerobic digester sludges thermally pre-treated or not. Significant yields variations were recorded even between different strains of the same species by i.e. about 20% for three Clostridium butyricum strains. The pure Clostridium butyricum and pasteurianum strains achieved the highest yields i.e. up to 1,36 mol H2/mol glucose compared to the yields achieved by the sludges and the tested Escherichia and Citrobacter strains. [less ▲] Detailed reference viewed: 81 (39 ULg)Isolation of bioactive peptides from tryptone that modulate lipase production in Yarrowia lipolytica; ; et al in Bioresource Technology (2009), 100 Detailed reference viewed: 11 (2 ULg)Dietary fibre components and pectin chemical features of peels during ripening in banana and plantain varieties.Happi Emaga, Thomas ; ; Ronkart, Sébastien et alin Bioresource Technology (2008), 99(10), 4346-4354 Detailed reference viewed: 43 (16 ULg) |
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