scholarly journals Autohydrolysis pretreatment of castor plant pruning residues to enhance enzymatic digestibility and bioethanol production

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6206-6216
Author(s):  
José A. Rodríguez-de la Garza ◽  
David Castillo-Quiroz ◽  
Leopoldo J. Rios-González ◽  
Thelma K. Morales-Martínez ◽  
José A. González-Fuentes ◽  
...  
Keyword(s):  
Ethanol Conversion ◽  
Conversion Yield ◽  
Enzymatic Hydrolysate ◽  
Xylan Hydrolysis ◽  
Biodiesel Synthesis ◽  
Castor Plant ◽  
Pruning Residues ◽  
Hydrolysis Of ◽  
By Products ◽  
Biomass To Ethanol

Castor plant is used commonly for oil extraction and biodiesel synthesis. However, the residues during pruning are not being used effectively. These residues have the potential to be used as feedstock to produce bioethanol and other by-products. The present work assessed the eco-friendly autohydrolysis pretreatment of castor plant pruning residues at different severity factors (R0), applying a range of temperatures from 100 °C to 200 °C. The hydrolysis of pretreated solids was carried out using a commercial cellulases complex at different solid and enzyme loadings. The enzymatic hydrolysate with a higher glucose concentration was further subjected to fermentation using Saccharomyces cerevisiae ATCC 4126. The results showed an efficient xylan hydrolysis (77.5%) and a preservation of glucan up to 83% in the solids pretreated at an R0 of 5.78. The enzymatic hydrolysis of the pretreated solids at an R0 of 5.78 showed a glucose release of 2.9-fold higher than non-pretreated material. In the hydrolysate fermentation, a maximum ethanol production of 50.5 g/L was achieved (equivalent to 6.4% v/v), corresponding to a conversion efficiency of 98% and a biomass-to-ethanol conversion yield of 93.0 g of ethanol per kilogram of feedstock.

FTIR as a rapid tool for monitoring molecular weight distribution during enzymatic protein hydrolysis of food processing by-products

2017 ◽  
Vol 9 (29) ◽  
pp. 4247-4254 ◽  
Author(s):  
Sileshi Gizachew Wubshet ◽  
Ingrid Måge ◽  
Ulrike Böcker ◽  
Diana Lindberg ◽  
Svein Halvor Knutsen ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Food Processing ◽  
Protein Hydrolysis ◽  
Multivariate Approach ◽  
Hydrolysis Of ◽  
By Products ◽  
Rapid Tool

An FTIR-based multivariate approach is developed for monitoring molecular weight distribution during enzymatic protein hydrolysis of byproducts.

Utilization of Silica from Indonesian Solid Wastes as Catalyst Materials

2020 ◽  
Vol 849 ◽  
pp. 72-77
Author(s):  
Firman Kurniawansyah ◽  
Amila D. Istiqomah ◽  
Aisyah J. Malahayati ◽  
Himawan Tri Bayu Murti Petrus ◽  
Achmad Roesyadi
Keyword(s):  
Acidic Solution ◽  
Agricultural Waste ◽  
Sulphuric Acid Solution ◽  
Solid Catalyst ◽  
Glucose Yield ◽  
Active Metal ◽  
Alternative Sources ◽  
Hydrolysis Of ◽  
Seaweed Industry ◽  
By Products

Synthesizing materials can be attempted by utilizing alternative sources such as wastes or disposed/by-products of certain activities. In this article, exploration of silica from agricultural waste and from geothermal sludgefor production of silica catalysts, are presented. The first silica catalyst was synthesized from rice husk. The husk was initially heated until silica ashes could be formed. After immersion in acidic solution, impregnation with nickel and molybdenum were conducted to introduce active metal of nickel (Ni) and molybdenum (Mo) in the support structure. The catalyst formed, Ni-Mo/SiO2 was applied to convert crude palm oil into biofuels. The other silica catalyst was obtained from geothermal sludge. After washing, the catalyst was soaked in sulphuric acid solution to form acidic silica solid catalyst. The catalyst was applied in hydrolysis of seaweed-industry solid waste to produce glucose. The catalyst was relatively successful to facilitate 19-20% glucose yield, or up to 21% glucose selectivity from waste material.

scholarly journals Influence of Initial Alkalinity of Lignocellulosic Waste on Their Enzymatic Degradation

2014 ◽  
Vol 40 (2) ◽  
pp. 103-113
Author(s):  
Marcin Wołczyński ◽  
Marta Janosz-Rajczyk
Keyword(s):  
Enzymatic Hydrolysis ◽  
Enzymatic Degradation ◽  
Suspended Solids ◽  
Lignocellulosic Waste ◽  
Initial Exposure ◽  
Total Sugars ◽  
Physical Chemical ◽  
Effect Of Treatment ◽  
Hydrolysis Of ◽  
By Products

Abstract The presented results of research on the effectiveness of enzymatic hydrolysis of lignocellulosic waste, depending on their initial depolymerisation in alkaline medium were considered in the context of the possibility of their further use in the fermentation media focused on the recovery of energy in the form of molecular hydrogen. The aim of this study was to determine the appropriate dose and concentration of a chemical reagent, whose efficiency would be high enough to cause decomposition of the complex, but without an excessive production of by-products which could adversely affect the progress and effectiveness of the enzymatic hydrolysis and fermentation. The effect of treatment on physical-chemical changes of homogenates’ properties such as pH, COD, the concentration of monosaccharide and total sugars and the concentration of total suspended solids and volatile suspended solids was determined. The enzymatic decomposition of lignocellulosic complex was repeatedly more efficient if the sample homogenates were subjected to an initial exposure to NaOH. The degree of conversion of complex sugars into simple sugars during enzymatic hydrolysis of homogenates pre-alkalized to pH 11.5 and 12.0 was 83.3 and 84.2% respectively, which should be sufficient for efficient hydrogen fermentation process.

Bioanalytical Aspects in Enzymatic Protein Hydrolysis of By-Products

2019 ◽  
pp. 225-258 ◽  
Author(s):  
Sileshi G. Wubshet ◽  
Diana Lindberg ◽  
Eva Veiseth-Kent ◽  
Kenneth A. Kristoffersen ◽  
Ulrike Böcker ◽  
...  
Keyword(s):  
Protein Hydrolysis ◽  
Hydrolysis Of ◽  
By Products

Enzymatic Hydrolysis of Sardine (Sardina pilchardus) By-products and Lipid Recovery

2009 ◽  
Vol 18 (1-2) ◽  
pp. 120-134 ◽  
Author(s):  
Irineu Batista ◽  
Cristina Ramos ◽  
Rita Mendonça ◽  
Maria Leonor Nunes
Keyword(s):  
Enzymatic Hydrolysis ◽  
Sardina Pilchardus ◽  
Hydrolysis Of ◽  
By Products

Phosphanchalkogenide und ihre Metallkomplexe. IV. Halogenierungsprodukte der Gold(I)halogenidkomplexe einiger Diphosphanmonochalkogenide

2016 ◽  
Vol 71 (3) ◽  
pp. 249-265 ◽  
Author(s):  
Christina Taouss ◽  
Peter G. Jones
Keyword(s):  
Membered Ring ◽  
Quantitative Yield ◽  
X Ray Diffraction ◽  
Central Ring ◽  
X Ray ◽  
Hydrolysis Products ◽  
Related Product ◽  
Hydrolysis Of ◽  
By Products

AbstractDiphosphanegold(I) complexes of the form dppmEAuX [dppm = bis(diphenylphosphano)methane, E = S, Se; X = Br, I], dppeEAuX [dppe = 1,2-bis(diphenylphosphano)ethane; E = O, S; X = Br, I] and dppbzEAuX [dppbz = 1,2-bis(diphenylphosphano)benzene; E = S, Se, X = Br, I] were treated with elemental X2. With dppm, the three products [dppmEAuX2]+X3– (E = S, X = Br (1), I (2); E = Se, X = I (3) were obtained in quantitative yield. These are gold(III) complexes involving a five-membered ring . With dppe, the only related product was [dppeEAuBr2]+Br3– (4), in which the central ring is six-membered with two carbon atoms. These dppe systems are very sensitive to oxidation/hydrolysis of the ligand, and several such unintended products were isolated and identified. The reaction of dppbzSAuBr with bromine leads to [dppbzS]2+[AuBr4]–Br– (5), the dication of which is formally 1,1,3,3-tetraphenylbenzo[d]-2-thia-1, 3-diphosphol-1,3-diium and contains a central five-membered ring . The dications are associated with the bromide anions via S…Br contacts of ca. 3.1 Å to form inversion-symmetric S2Br2 rings. The halogenation of the dppbzSe derivatives leads to loss of selenium and formation of dppbzAuBr3 (6), with [4+1] coordination at gold, or the known compound [dppbzAuI2]+I3– (7). All products 1–6 were subjected to X-ray diffraction analyses, as were four hydrolysis products 4a–d and two further by-products [5(thtBr+)·2Br3–·3(AuBr4–)] (1a) and (tht)AuBr3 (1b). Compound 1a displays unusually short Br…Br contacts of 3.2398(8) Å between neighbouring tetrabromidoaurate(III) ions.

scholarly journals The degradation of diethyl phthalate (DEP) during ozonation: oxidation by-products study

2009 ◽  
Vol 8 (2) ◽  
pp. 290-298 ◽  
Author(s):  
Yeon Jung Jung ◽  
Byung Soo Oh ◽  
Kyoung Suk Kim ◽  
Minoru Koga ◽  
Ryota Shinohara ◽  
...  
Keyword(s):  
Aromatic Ring ◽  
Pure Water ◽  
Diethyl Phthalate ◽  
Aliphatic Chain ◽  
Ozone Decomposition ◽  
Batch Mode ◽  
Ozone Dose ◽  
Acidic Compounds ◽  
Hydrolysis Of ◽  
By Products

The degradation of diethyl phthalate (DEP) in an aqueous solution during ozonation was investigated by identifying the oxidation intermediates using GC–MS. The experiments were carried out in semi-batch mode with a 1.5 mg l−1-min ozone dose. The proposed degradation pathways were divided into hydrolysis of the aliphatic chain (pathway (A)) and hydroxylation resulting from ∙OH attack in the aromatic ring (pathway (B)). With increasing ozone dose, the aromatic ring of DEP was opened and acidic compounds, such as malonic acid, succinic acid and glutaric acid were formed. In addition, the ozonation of DEP for 18 min induced hydrogen peroxide (H2O2) generation at levels six times higher than pure water. Of the intermediates indentified, phthalic acid (PA) and phthalic anhydride (PAH) enhanced the degradation of DEP by promoting ozone decomposition.

Enzymatic hydrolysis of cod (Gadus morhua) by-products

2005 ◽  
Vol 40 (12) ◽  
pp. 3680-3692 ◽  
Author(s):  
Rasa Šližytė ◽  
Turid Rustad ◽  
Ivar Storrø
Keyword(s):  
Enzymatic Hydrolysis ◽  
Gadus Morhua ◽  
Hydrolysis Of ◽  
By Products
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