Solid-state hydrolysis of postconsumer polyethylene terephthalate after plasma treatment

2012 ◽  
Vol 127 (3) ◽  
pp. 1989-1996 ◽  
Author(s):  
Sandro Donnini Mancini ◽  
Alex Rodrigues Nogueira ◽  
Elidiane Cipriano Rangel ◽  
Nilson Cristino da Cruz
Keyword(s):  
Solid State ◽  
Plasma Treatment ◽  
Polyethylene Terephthalate ◽  
Hydrolysis Of

47,49Ti NMR in Metals, Inorganics, and Gels

2000 ◽  
Vol 55 (1-2) ◽  
pp. 291-297 ◽  
Author(s):  
T. J. Bastow
Keyword(s):  
Solid State ◽  
Titanium Oxide ◽  
Recent Progress ◽  
Titanium Isopropoxide ◽  
Metallic State ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrolysis Of ◽  
C Nmr

Some recent progress in solid state 47,49Ti NMR is described and reviewed. The metallic-state work described covers metals such as hep titanium, TiB2 , a number of intermetallics such as TiAl2 and TiAl3· The inorganic work covers the various titanium oxide based materials including the TiO2 polymorphs, anatase, rutile and brookite. The gel work covers the evolution of crystalline titania from gels formed by hydrolysis of titanium isopropoxide. Some complementary data from 17O and 13C NMR and powder X-ray diffraction is also included.

Production of Thermostable Lipase by Thermomyces lanuginosus on Solid-State Fermentation: Selective Hydrolysis of Sardine Oil

2014 ◽  
Vol 174 (5) ◽  
pp. 1859-1872 ◽  
Author(s):  
Nayeli Ávila-Cisneros ◽  
Susana Velasco-Lozano ◽  
Sergio Huerta-Ochoa ◽  
Jesús Córdova-López ◽  
Miquel Gimeno ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Fermentation ◽  
Thermomyces Lanuginosus ◽  
Selective Hydrolysis ◽  
Thermostable Lipase ◽  
Sardine Oil ◽  
Hydrolysis Of

scholarly journals Fungal cellulases: production by solid-state cultivation in packed-bed bioreactor using solid agro-industrial by-products as substrates and application for hydrolysis of sugarcane bagasse

2020 ◽  
pp. 2097-2116 ◽  
Author(s):  
Priscila Aparecida Casciatori Frassatto ◽  
Fernanda Perpétua Casciatori ◽  
João Cláudio Thoméo ◽  
Eleni Gomes ◽  
Maurício Boscolo ◽  
...  
Keyword(s):  
Solid State ◽  
Sugarcane Bagasse ◽  
Enzyme Production ◽  
Packed Bed ◽  
Aeration Rate ◽  
Hydrolysis Time ◽  
Enzymatic Extract ◽  
Packed Bed Bioreactor ◽  
High Concentrations ◽  
Hydrolysis Of

Cellulases are essential for the hydrolysis of lignocellulosic materials in the production of second generation ethanol. Solid-state cultivation is a process that provides high concentrations of enzymes that can be used in this hydrolysis. The objectives of this work were to produce cellulases by cultivating the fungus Myceliophthora thermophila I-1D3b in a packed bed bioreactor with sugarcane bagasse (SCB) and wheat bran (WB) as substrate and to evaluate the efficiency of the enzymatic extract in the hydrolysis of SCB in natura (BIN) and pretreated with ozone, alkali and ultrasound (BOU). The conditions for enzyme production in the bioreactor were SCB:WB at a ratio of 2.3:1 (w/w), 75 % moisture content; 45 ºC; aeration rate 240 L h-1 and 96 h. The enzyme production was evaluated by endoglucanase, xylanase, filter paper (FPU) and ?-glycosidase activities. For the application of the enzymes, a central composed response surface design with 5 repetitions of the central point was used, taking enzyme volume and hydrolysis time as factors. Such cultivation yielded the following enzymatic activities: 723 U gss-1 of endoglucanases, 2024 U gss-1 of xylanase, 12.6 U gss-1 of FPU and 41 U gss-1 of ?-glucosidase. The results of the application tests indicated the best conditions as 7.0 ml of the enzyme extract (4.2 FPU) and 6 hours for BIN and BOU. The best cellulose-glucose conversions were obtained for BOU, reaching 32.1 % at 65 ºC. In conclusion, the enzyme production in the packed bed bioreactor was efficient and BOU pretreatment improved the hydrolysis of biomass, increasing the efficiency of conversion of cellulose to glucose.

Valorization of agro-industrial wastes to produce hydrolytic enzymes by fungal solid-state fermentation

2018 ◽  
Vol 37 (2) ◽  
pp. 149-156 ◽  
Author(s):  
C. Marzo ◽  
A.B. Díaz ◽  
I. Caro ◽  
A. Blandino
Keyword(s):  
Solid State ◽  
Solid State Fermentation ◽  
Reducing Sugars ◽  
Raw Materials ◽  
Hydrolytic Enzymes ◽  
Industrial Wastes ◽  
Added Value ◽  
Orange Peels ◽  
Enzyme Cocktail ◽  
Hydrolysis Of

Nowadays, significant amounts of agro-industrial wastes are discarded by industries; however, they represent interesting raw materials for the production of high-added value products. In this regard, orange peels (ORA) and exhausted sugar beet cossettes (ESBC) have turned out to be promising raw materials for hydrolytic enzymes production by solid state fermentation (SSF) and also a source of sugars which could be fermented to different high-added value products. The maximum activities of xylanase and exo-polygalacturonase (exo-PG) measured in the enzymatic extracts obtained after the SSF of ORA were 31,000 U·kg-1 and 17,600 U·kg-1, respectively; while for ESBC the maximum values reached were 35,000 U·kg-1 and 28,000 U·kg-1, respectively. The enzymatic extracts obtained in the SSF experiments were also employed for the hydrolysis of ORA and ESBC. Furthermore, it was found that extracts obtained from SSF of ORA, supplemented with commercial cellulase, were more efficient for the hydrolysis of ORA and ESBC than a commercial enzyme cocktail typically used for this purpose. In this case, maximum reducing sugars concentrations of 57 and 47 g·L-1 were measured after the enzymatic hydrolysis of ESBC and ORA, respectively.

scholarly journals A Novel Approach of Promoting Adhesion of Reinforcing Cord to Elastomers by Plasma Polymerization

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 577 ◽  
Author(s):  
Wilma Dierkes ◽  
André Louis ◽  
Jacques Noordermeer ◽  
Anke Blume
Keyword(s):  
Plasma Treatment ◽  
Polyethylene Terephthalate ◽  
Plasma Polymerization ◽  
Promising Alternative ◽  
Resorcinol Formaldehyde ◽  
Plasma Activation ◽  
Novel Approach ◽  
Adhesion System ◽  
Adhesion Level ◽  
Sulfur Containing

Adhesion of cords to elastomers is crucial for many elastomeric products, such as tires and V-belts. The best adhesion system so far is based on a combination of resorcinol, formaldehyde, and a latex (RFL). However, this cord treatment has serious disadvantages in terms of processing and toxicity. A promising alternative is a plasma treatment of the cords prior to be embedded in the elastomer. For rayon cords, a plasma polymerization of sulfur-containing precursors results in adhesion levels close to RFL treatment. However, for polyethylene terephthalate (PET) cords, this treatment is not satisfactory. For this type of cords, a water-plasma activation followed by a silane dip is more promising, as 72% of the adhesion level of RFL treatment could be achieved. For rayon, an even higher adhesion level was realized.

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