scholarly journals Characterization of aquatic plant (Egeria densa) pre-treated by alkaline hydrogen peroxide

2019 ◽  
Vol 404 ◽  
pp. 012028 ◽  
Author(s):  
S D Hardiningtyas ◽  
F Aziz ◽  
J Santoso ◽  
Uju
Keyword(s):  
Hydrogen Peroxide ◽  
Aquatic Plant ◽  
Egeria Densa ◽  
Alkaline Hydrogen Peroxide

Physicochemical Characterization of Oxidatively Degraded Calcium Lignosulfonate via Alkaline Hydrogen Peroxide

2014 ◽  
Vol 887-888 ◽  
pp. 575-580 ◽  
Author(s):  
Li Hong Hu ◽  
Jing Zhou ◽  
Cai Ying Bo ◽  
Bing Chuan Liang ◽  
Yong Hong Zhou
Keyword(s):  
Hydrogen Peroxide ◽  
Phenolic Resin ◽  
Physicochemical Characterization ◽  
Oxidative Degradation ◽  
Alkaline Condition ◽  
Alkaline Hydrogen Peroxide ◽  
Phenolic Contents ◽  
H Nmr ◽  
Ft Ir

In order to increase the application prospect of calcium lignosulfonate in phenolic resin, Calcium lignosulfonate was oxidatively degraded by Hydrogen peroxide under alkaline condition. Both lignins were characterized by FT-IR, 1H NMR, UV, GC-MS and GPC. The optimal degradation conditions are: lignosulfonate:water=1:1, wt/wt, pH=10, temperature 60 °C, reaction time 2 h, and H2O2 dosage 6 wt% (based on weight of lignosulfonate). The results show that the degraded resultant is higher in phenolic contents, and lower in methoxyl content. Number molecular weight (Mn) of calcium lignosulfonate sharply decreases to 2294, versus 17774 before oxidative degradation.Guaiacly monoer content increased and kinds of phenolic compounds occurre in oxidative degradation fractions, mainly due to β-O-4 and β-5 cleavage. And reactive activity of the oxidatively degraded compounds is sharply increased.

scholarly journals Structural characterization of alkaline hydrogen peroxide pretreated grasses exhibiting diverse lignin phenotypes

2012 ◽  
Vol 5 (1) ◽  
pp. 38 ◽  
Author(s):  
Muyang Li ◽  
Cliff Foster ◽  
Shantanu Kelkar ◽  
Yunqiao Pu ◽  
Daniel Holmes ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Structural Characterization ◽  
Alkaline Hydrogen Peroxide

Cleavage of territrems by alkaline hydrogen peroxide: Isolation and characterization of the aromatic moiety of territrems

1987 ◽  
Vol 3 (2) ◽  
pp. 58-64 ◽  
Author(s):  
Kuo Huang Ling ◽  
Bai Jiun Chen ◽  
Yun Wen Peng ◽  
Shih Chong Tsai ◽  
Fu Chuo Peng ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Alkaline Hydrogen Peroxide ◽  
Aromatic Moiety ◽  
Isolation And Characterization

Fractional pretreatment of lignocellulose by alkaline hydrogen peroxide: Characterization of its major components

2015 ◽  
Vol 94 ◽  
pp. 322-330 ◽  
Author(s):  
Yapeng Su ◽  
Ruoyu Du ◽  
Hong Guo ◽  
Ming Cao ◽  
Qinfeng Wu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Alkaline Hydrogen Peroxide

CHARACTERIZATION OF A HYDROGEN PEROXIDE-BENZENE COMPLEX USING MATRIX ISOLATION INFRARED SPECTROSCOPY

2019 ◽  
Author(s):  
Jay Amicangelo ◽  
Lia Totleben ◽  
Jacob Oslosky ◽  
Yudhishtara Payagala ◽  
Catherine Kaiser ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Infrared Spectroscopy ◽  
Matrix Isolation

Synthesis and Characterization of Silver Nanoplates by a Seed-mediated Method

2019 ◽  
Vol 29 (3) ◽  
Author(s):  
Mai Ngọc Tuan Anh
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Silver Nitrate ◽  
Sodium Borohydride ◽  
Trisodium Citrate ◽  
Synthesis And Characterization ◽  
Silver Nanoplates ◽  
Seed Mediated

Silver nanoplates (SNPs) having different size were synthesized by a seed-mediated method. The seeds -silver nanoparticles with 4 – 6 nm diameters were synthesized first by reducing silver nitrate with sodium borohydride in the present of Trisodium Citrate and Hydrogen peroxide. Then these seeds were developed by continue reducing Ag\(^+\) ions with various amount of L-Ascorbic acid to form SNPs. Our analysis showed that the concentratrion of L-Ascorbic acid, a secondary reducing agent, played an important role to form SNPs. In addition, the size and in-plane dipole plasmon resonance wavelenght of silver nanoplates were increased when the concentration of added silver nitrate increased. The characterization of SNPs were studied by UV-Vis, FE-SEM, EDS and TEM methods.

The behavior of chromophoric structures in softwood mechanical pulp on bleaching with alkaline hydrogen peroxide

2006 ◽  
Vol 21 (3) ◽  
pp. 359-364 ◽  
Author(s):  
Eva Svensson Rundlöf ◽  
Eric Zhang ◽  
Liming Zhang ◽  
Göran Gellerstedt
Keyword(s):  
Hydrogen Peroxide ◽  
Alkaline Hydrogen Peroxide ◽  
Mechanical Pulp

A Simple, Green and Fast Ultraviolet Spectrophotometric Method for the Carbamide Peroxide Determination in Dental Whitening Products

2019 ◽  
Vol 15 (2) ◽  
pp. 138-144
Author(s):  
Fabiana Vieira Lima ◽  
Aline Farias ◽  
Cassiana Mendes ◽  
Simone Gonçalves Cardoso ◽  
Marcos Antônio Segatto Silva
Keyword(s):  
Hydrogen Peroxide ◽  
Pharmaceutical Products ◽  
Reference Solution ◽  
Iodometric Titration ◽  
Carbamide Peroxide ◽  
Ultraviolet Detection ◽  
Water As Solvent ◽  
Development And Validation ◽  
Dental Whitening

Background: The carbamide peroxide is the most commonly active ingredient used for home dental whitening products, its quantification in pharmaceutical products is of extreme importance due to the relation with the products potency and the previously related low carbamide peroxide stability. Once, there is only one official carbamide peroxide determination based on iodometric titration, this method is time-consuming and generates a lot of residues. The aim of this study was to carry out development and validation of a simple and fast ultraviolet spectrophotometer assay to quantify an innovative dental whitening gel. Methods: The proposed method was validated according international conference on harmonization guideline. Procedure is based on the iodide/iodine redox chemistry; iodine released through the action of hydrogen peroxide of carbamide peroxide with ultraviolet detection at 350 nm. Results: The procedure was linear in the concentration range of 1.0-4.0 µg/mL, specific to the excipients, robust for the evaluated parameters (variation of wavelength (± 5 nm); reagent addition (± 10%)), showing the results of RSD 1.88 and 0.39% respectively. Repeatability precision was RSD = 1.42%, with accurate RSD = 2.15% by adding reference solution. The assay used only water as solvent for sample preparation. In comparison to the pharmacopeial method, the latter is more time-consuming, as it generates a lot of residues, and it could not quantify small CP dosages. Conclusion: Thus, the proposed method was proved to be suitable to determine carbamide peroxide during the development and characterization of nanoparticle formulations in the present study.

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