Comparative Studies of Hemicelluloses Solubilized during the Treatments of Maize Stems with Peroxymonosulfuric Acid, Peroxyformic Acid, Peracetic Acid, and Hydrogen Peroxide. Part 2. Spectroscopic and Thermal Characterizations

Holzforschung ◽  
2000 ◽  
Vol 54 (5) ◽  
pp. 492-496 ◽  
Author(s):  
Runcang Sun ◽  
J. Tomkinson ◽  
Z. C. Geng ◽  
N. J. Wang
Keyword(s):  
Hydrogen Peroxide ◽  
Peracetic Acid ◽  
Molar Mass ◽  
Gel Permeation Chromatography ◽  
Spectroscopic Techniques ◽  
Average Molar Mass ◽  
Alkaline Peroxide ◽  
Peroxyformic Acid ◽  
Thermal Stability Of ◽  
Obvious Feature

Summary Ten hemicellulosic preparations, obtained by treatments of the water-extracted maize stems with peroxymonosulfuric acid, peroxyformic acid, peracetic acid, and 2% hydrogen peroxide under the conditions given, respectively, were investigated by gel permeation chromatography and spectroscopic techniques such as Fourier transform infrared and carbon-13 nuclear magnetic resonance. Under an optimum extracting condition (2% H2O2, 45°C, 12 h, pH 11.5–12.0), the hemicelluloses obtained represented 63.3–64.7 % of the original hemicelluloses and had high weight-average molar mass between 69060 and 54740 g mol−1. The most obvious feature was found that the alkaline peroxide treatment of the stems under the conditions used did not affect the overall structure of the hemicelluloses. The thermal stability of the hemicelluloses was found to increase slightly with increasing molar mass. All the hemicellulosic preparations were, however, to varying degree thermally unstable at temperature above 180°C.

Comparative Studies of Hemicelluloses Solubilized during the Treatments of Maize Stems with Peroxymonosulfuric Acid, Peroxyformic Acid, Peracetic Acid, and Hydrogen Peroxide. Part 1. Yield and Chemical Characterization

Holzforschung ◽  
2000 ◽  
Vol 54 (4) ◽  
pp. 349-356 ◽  
Author(s):  
RunCang Sun ◽  
J. Tomkinson ◽  
Z. C. Geng ◽  
N. J. Wang
Keyword(s):  
Hydrogen Peroxide ◽  
Cell Wall ◽  
Optimum Condition ◽  
Peracetic Acid ◽  
Chemical Characterization ◽  
Alkaline Media ◽  
Minimal Amount ◽  
Minor Components ◽  
Alkaline Peroxide ◽  
Peroxyformic Acid

Summary Treatment of the water-extracted maize stems with peroxymonosulfuric acid at 20 °C for 144 h, peroxyformic acid at 80°C for 6 h, peracetic acid at 50°C for 6 h, and 2% hydrogen peroxide at 45°C for 12 h at pH 1.5, 4.4, 9.5, 11.5, 12.0, and 12.6, respectively, solubilized 47.1%, 91.3%, 33.3%, 16.6%, 15.9%, 17.4%, 86.2%, 87.7%, and 91.3% of the original lignin, and hydrolysed or dissolved 12.1%, 99.1%, 4.5%, 2.7%, 3.1%, 3.1%, 63.3%, 64.7%, and 83.0% of the original hemicelluloses, respectively. Substantial lignins and hemicelluloses were degraded or released during the treatment with peroxyformic acid and alkaline peroxide at pH ≥ 11.5, while an insignificant effect on delignification and hemicellulose solubilization was observed by using peroxymonosulfuric acid, peracetic acid, and hydrogen peroxide in acidic, natural, and weak alkaline media. The optimum condition for extraction of hemicelluloses was found to use 2% H2O2 at 45°C for 12 h at pH 11.5–12.0, which yielded 63.3–64.7% of the original hemicelluloses having much lighter color than those obtained by peroxymonosulfuric acid and peracetic acid under conditions used and 2% H2O2 at pH 1.5, 4.4, 9.5, and 12.6. Xylose and arabinose were the major sugar constituents in these hemicellulose preparations, whereas glucose, galactose, mannose, rhamnose, and fucose were present as minor components. The α-ether linkages between lignin and hemicelluloses in the cell wall of maize stems were substantially cleaved during the treatment with 2% H2O2 at pH ≥11.5 as shown by a minimal amount of associated lignin (2.9–3.9%), rich in syringyl units, in the solubilized hemicelluloses.

Totally Chlorine Free Bleaching of Eucalyptus globulus Dissolving Pulps Delignified with Peroxyformic Acid and Formic Acid

Holzforschung ◽  
2002 ◽  
Vol 56 (1) ◽  
pp. 60-66 ◽  
Author(s):  
S. Abad ◽  
B. Saake ◽  
J. Puls ◽  
J. C. Parajó
Keyword(s):  
Hydrogen Peroxide ◽  
Formic Acid ◽  
Eucalyptus Globulus ◽  
Molar Mass ◽  
Oxygen Delignification ◽  
Operational Conditions ◽  
Bleached Pulp ◽  
Target Values ◽  
Dissolving Pulps ◽  
Peroxyformic Acid

Summary Eucalyptus globulus wood samples were delignified in two-stage treatments carried out in media made up of formic acid, water and hydrogen peroxide under selected operational conditions. The pulps were subjected to Totally Chlorine Free (TCF) bleaching sequences. Alkaline treatments, oxygen delignification, ozone stages and treatments with peroxyacids were assayed in order to reach the target values for dissolving pulps. Under the best conditions, a fully bleached pulp (91.6% ISO brightness) with SCAN viscosity of 649 ml/g and favourable molar mass distribution was obtained.

Fractional Extraction and Structural Characterization of Coconut Shell Hemicellulose

2014 ◽  
Vol 716-717 ◽  
pp. 108-113 ◽  
Author(s):  
Feng Hui Zhao ◽  
Yong Chen ◽  
Run Liu Chen ◽  
Min Liu ◽  
Yu Qiang Guo ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Potassium Hydroxide ◽  
Ph Value ◽  
Potassium Hydroxide Solution ◽  
Gel Permeation Chromatography ◽  
Coconut Shell ◽  
Optimal Conditions ◽  
Alkaline Peroxide ◽  
Ft Ir

Three principal components (cellulose, lignin, and hemicellulose) of coconut shell (CS), an abundant tropical biomass, were quantified using the Van Soest method. It was observed that CS had a high content of hemicellulose (30% of the raw CS material). The present study was undertaken to investigate the extractability of hemicellulose from CS obtained by ultrasound-assisted potassium hydroxide solution with the hydrogen peroxide method. The ultrasonic treatment and sequential extractions with alkali and alkaline peroxide under optimal conditions led to a release of more than 93% of the original hemicellulose. The effects of experimental variables, including pH value, reaction temperature and time, hydrogen peroxide content, and magnesium sulfate dosage on hemicellulose content were investigated. The obtained hemicelluloses were characterized by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC), and comprehensive thermal analysis (TGA), which showed that potassium hydroxide significantly affected the yield of relatively pure hemicellulose.

Characteristics of Dissolved Organic Material in Total Chlorine Free Bleach Plant and Laboratory Effluents

1999 ◽  
Vol 40 (11-12) ◽  
pp. 249-258 ◽  
Author(s):  
S. Liukko ◽  
K. Poppius-Levlin
Keyword(s):  
Acid Hydrolysis ◽  
Organic Material ◽  
Chromatographic Analysis ◽  
Molar Mass ◽  
Pulp Mill ◽  
Aromatic Acids ◽  
Carbohydrate Component ◽  
Average Molar Mass ◽  
Alkaline Peroxide ◽  
Absorbing Material

The dissolved organic material present in totally chlorine free (TCF) pulp mill bleaching effluents and in their laboratory made counterparts was characterized using chemical and chromatographic analysis. Special attention was given to analysis of material originating from lignin and carbohydrate. With the exception of the P2 laboratory effluent, the BOD7, COD and TOC loads and the content of aromatic lignin in the effluents, were higher in the mill effluents. After oxygen stages, the content of monomeric acidic phenols and aromatic acids in the effluents was very low. The highest amount of carbohydrates was found dissolved in the first P stage mill effluent. The average molar mass of UV-absorbing material was lowest in ozone effluents. Carbohydrates were determined as monosaccharides after acid hydrolysis. Xylan was the main carbohydrate component in most effluents, and after ultrafiltration more xylose was found in fractions over 10 000 NMM. Ozone effluents were rich in arabinose, which was mostly found in fractions below 10 000 NMM. Most of the mannose and galactose that dissolved in the first alkaline peroxide stage effluents was found in fractions over 10 000 NMM.

Oxidative polymerization of anilinium 5-sulfosalicylate with peroxydisulfate in water

2010 ◽  
Vol 64 (6) ◽  
Author(s):  
Budimir Marjanović ◽  
Ivan Juranić ◽  
Slavko Mentus ◽  
Gordana Ćirić-Marjanović ◽  
Petr Holler
Keyword(s):  
Elemental Analysis ◽  
Molar Mass ◽  
Oxidative Polymerization ◽  
Gel Permeation Chromatography ◽  
Covalent Bonding ◽  
High Thermal Stability ◽  
Small Extent ◽  
Spectroscopy Study ◽  
Average Molar Mass ◽  
Ammonium Peroxydisulfate

AbstractAnilinium 5-sulfosalicylate was prepared and characterized by elemental analysis, and FTIR and NMR spectroscopies. It was polymerized in an aqueous solution using ammonium peroxydisulfate as an oxidant. The precipitated polyaniline 5-sulfosalicylate exhibited high thermal stability and conductivity of 0.13 S cm−1. Its mass-average molar mass and polydispersity index were determined by gel-permeation chromatography as 22,900 g mol−1 and 2.7, respectively. Elemental analysis and FTIR spectroscopy study of polyaniline 5-sulfosalicylate revealed the doping level and the oxidation state between emeraldine and protoemeraldine salt while corresponding studies of the polyaniline base indicate a small extent of the covalent bonding of 5-sulfosalicylate anions to polyaniline chains.

scholarly journals Inhibition Properties of Arylsulfatase and β-Glucuronidase by Hydrogen Peroxide, Hypochlorite, and Peracetic Acid

ACS Omega ◽  
2021 ◽  
Author(s):  
Shu-shu Zhong ◽  
Jun Zhang ◽  
Ze-hua Liu ◽  
Zhi Dang ◽  
Yu Liu
Keyword(s):  
Hydrogen Peroxide ◽  
Peracetic Acid

scholarly journals Molar mass determination of lignins and characterization of their polymeric structures by multi-detector gel permeation chromatography

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Evamaria C. Gaugler ◽  
Wolfgang Radke ◽  
Andrew P. Vogt ◽  
Dawn A. Smith
Keyword(s):  
Molar Mass ◽  
Lithium Bromide ◽  
Gel Permeation Chromatography ◽  
Mass Determination ◽  
Organosolv Lignin ◽  
Gel Permeation ◽  
Softwood Kraft Lignin ◽  
Polymeric Structures

AbstractMolar masses, Mark-Houwink-Sakurada (MHS) exponents, and refractive index increments (dn/dc) for three lignins were determined without derivatization by multi-detector gel permeation chromatography (GPC) in dimethylformamide (DMF) with 0.05 M lithium bromide (LiBr). The lack of effectiveness of fluorescence filters on molar mass determination by GPC-multi-angle laser light scattering (MALS) was confirmed for softwood kraft lignin (Indulin AT) and revealed for mixed hardwood organosolv lignin (Alcell) as well as soda straw/grass lignin (Protobind 1000). GPC with viscometry detection confirmed that these lignins were present as compact molecules. The MHS exponent α for Indulin AT and Alcell was in the order of 0.1. Additionally, the intrinsic viscosity of Protobind 1000 for a given molar mass was much lower than that of either Alcell or Indulin AT. This is the first report of dn/dc values for these three lignins in DMF with 0.05 M LiBr.

scholarly journals Inactivation of Prions by Low-Temperature Sterilization Technology Using Vaporized Gas Derived from a Hydrogen Peroxide–Peracetic Acid Mixture

Pathogens ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 24
Author(s):  
Akikazu Sakudo ◽  
Daiki Anraku ◽  
Tomomasa Itarashiki
Keyword(s):  
Hydrogen Peroxide ◽  
Medical Devices ◽  
Neurodegenerative Disorders ◽  
Peracetic Acid ◽  
Protein Misfolding ◽  
Prion Diseases ◽  
Proteinase K ◽  
Acid Mixture ◽  
Cover Glass ◽  
Standard Mode

Prion diseases are proteopathies that cause neurodegenerative disorders in humans and animals. Prion is highly resistant to both chemical and physical inactivation. Here, vaporized gas derived from a hydrogen peroxide–peracetic acid mixture (VHPPA) was evaluated for its ability to inactivate prion using a STERIACE 100 instrument (Saraya Co., Ltd.). Brain homogenates of scrapie (Chandler strain) prion-infected mice were placed on a cover glass, air-dried, sealed in a Tyvek package, and subjected to VHPPA treatment at 50–55 °C using 8% hydrogen peroxide and <10% peracetic acid for 47 min (standard mode, SD) or 30 min (quick mode, QC). Untreated control samples were prepared in the same way but without VHPPA. The resulting samples were treated with proteinase K (PK) to separate PK-resistant prion protein (PrPres), as a marker of the abnormal isoform (PrPSc). Immunoblotting showed that PrPres was reduced by both SD and QC VHPPA treatments. PrPres bands were detected after protein misfolding cyclic amplification of control but not VHPPA-treated samples. In mice injected with prion samples, VHPPA treatment of prion significantly prolonged survival relative to untreated samples, suggesting that it decreases prion infectivity. Taken together, the results show that VHPPA inactivates prions and might be applied to the sterilization of contaminated heat-sensitive medical devices.

Organic solvent-free synthesis of phosphorus-containing polymers

2007 ◽  
Vol 79 (11) ◽  
pp. 1879-1884 ◽  
Author(s):  
Smaranda Iliescu ◽  
Gheorghe Ilia ◽  
Aurelia Pascariu ◽  
Adriana Popa ◽  
Nicoleta Plesu
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Bisphenol A ◽  
Organic Solvent ◽  
Molar Mass ◽  
Interfacial Polycondensation ◽  
H Nmr ◽  
Phosphorus Containing ◽  
Solvent Free Synthesis ◽  
Thermal Stability Of

Direct, efficient, organic solvent- and catalyst-free synthesis of a series of polyphosphates was accomplished. The reaction involved a gas-liquid interfacial polycondensation between arylphosphoric dichlorides and bisphenol A. The polyphosphates were characterized by IR, 1H NMR, 31P NMR, inherent viscosity, thermal analysis, and molar mass. Yields in the range 70-90 % and inherent viscosities in the range 0.30-0.40 dl/g were obtained. The thermal stability of the polyphosphates was investigated by using thermogravimetry.

Sign in / Sign up

Export Citation Format

Share Document