Copper on chitosan-modified cellulose filter paper as an efficient dip catalyst for ATRP of MMA

AbstractAchieving an efficient catalyst in the ATRP system with a simple design, preparation from available materials, and high recyclability is a significant challenging issue. To attain the goal, herein, we used chitosan (CS)-modified cellulose filter paper (FP) as a green support for the synthesis of dip catalyst. The preparation of this catalyst involved surface treatment of the FP strips by CS coating through a dipping method, which increased the affinity of the substrate for adsorbing copper ions in the next step. The Cu@CS-FP catalyst was prepared without the requirement of any ligands. The synthesized dip-catalyst, in the form of the strips, was employed for the first time in the ATRP reaction of methyl methacrylate to assay catalytic activity. Catalytic insertion/ removal (ON/OFF) experiments were carried out during the polymerization. A reasonable control over the molecular weight with high conversion (68%) and polydispersity index of 1.32 under mild reaction conditions were obtained. Significantly, because of the facile separation of the catalyst, the amount of copper that remained in the polymer was very low (2.7 ppm). Also, the recyclability of the catalyst was investigated for five runs. The conversion in the final run was 64% without a loss of catalyst efficiency.

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Detection of cellulase inhibitor in the wheat bran culture of Aspergillus terreus

Canadian Journal of Microbiology ◽

10.1139/m81-204 ◽

1981 ◽

Vol 27 (12) ◽

pp. 1334-1340 ◽

Cited By ~ 6

Author(s):

S. N. Sinha ◽

B. L. Ghosh ◽

S. N. Ghose

Keyword(s):

Molecular Weight ◽

Wheat Bran ◽

Filter Paper ◽

Aspergillus Terreus ◽

Defined Medium ◽

Low Molecular Weight ◽

Chemically Defined Medium ◽

Plant Origin ◽

First Time ◽

Hydrolysis Of

The presence of a cellulase inhibitor in the wheat bran culture of a fungus is reported for the first time. The inhibitor has a low molecular weight and is relatively stable to heat. It is absent from wheat bran and is not produced in a chemically defined medium. Unlike cellulase inhibitors of plant origin, this inhibitor is not a polyphenol. It inhibits the hydrolysis of cotton to a greater degree than that of filter paper or carboxymethylcellulose. In addition to inhibiting Aspergillus terreus cellulase, it also inhibits a variety of commercial cellulases.

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A Greener Enzymatic Oligoesterification of Biobased Renewable Synthons

Journal of the Brazilian Chemical Society ◽

10.21577/0103-5053.20210024 ◽

2021 ◽

Author(s):

Juan Villavicencio ◽

Ferley Orozco ◽

Ricardo Benitez ◽

Jaime Martin ◽

Giovanni Rojas

Keyword(s):

Molecular Weight ◽

Molar Mass ◽

Gel Permeation Chromatography ◽

Scanning Calorimetry ◽

Reaction Conditions ◽

Step Process ◽

Gel Permeation ◽

One Step ◽

First Time ◽

Temperature Time

Polyesters of xylitol and succinic acid were prepared yielding from 70 to 75% by enzymecatalyzed esterification using a molar mass from 1:1 to 2:5 at 120 and 140 °C employing from 1 to 10% m/m of enzyme. Control over branching degree was achieved by tuning the reaction conditions (temperature, time, comonomer ratio, enzyme content). This one-step process from renewable starting materials avoids protection-deprotection techniques, as well as the use of toxic solvents by introducing limonene as solvent for polyesterification for the first time. All materials were structurally characterized by infrared (IR) and nuclear magnetic resonance (NMR)spectroscopy, their thermal properties were studied by differential scanning calorimetry (DSC)and thermogravimetric analysis (TGA), and the molecular weight of samples were obtained by gel-permeation chromatography (GPC).

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α-Glucosidase immobilization on chitosan-modified cellulose filter paper: Preparation, property and application

International Journal of Biological Macromolecules ◽

10.1016/j.ijbiomac.2018.10.177 ◽

2019 ◽

Vol 122 ◽

pp. 298-305 ◽

Cited By ~ 10

Author(s):

Dong-Mei Liu ◽

Juan Chen ◽

Yan-Ping Shi

Keyword(s):

Filter Paper ◽

Cellulose Filter ◽

Modified Cellulose

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Facile Synthesis of High Molecular Weight Polypeptides via Surface-Initiated Vapor Deposition Polymerization

10.20944/preprints201803.0267.v1 ◽

2018 ◽

Author(s):

Chih-Tsung Yang ◽

Jen-Chia Wu ◽

Ying-Chih Chang

Keyword(s):

Molecular Weight ◽

High Molecular Weight ◽

Vapor Deposition ◽

Reaction Conditions ◽

Phase Synthesis ◽

Resin Beads ◽

Solution Phase Synthesis ◽

Synthetic Polypeptides ◽

Conventional Solution ◽

First Time

Despite huge effort has been devoted to the design of the initiators and reaction conditions, it remains challenging to synthesize high molecular weight polypeptides with conventional solution phase synthesis. In this work, surface-initiated vapor deposition polymerization (SI-VDP) was utilized to graft synthetic polypeptides poly (γ-benzyl L-glutamate) (PBLG) from polystyrene (PS) resin beads by ring-opening polymerization of N-carboxyanhydrides (NCAs). It was demonstrated for the first time that high molecular weight bulk PBLG (> 500,000) could be readily obtained within one hour via solvent-free synthetic method which paves the way for the synthesis of copolypeptides with high molecular weight.

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Combustion-derived CdO nanopowder as a heterogeneous basic catalyst for efficient synthesis of sulfonamides from aromatic amines using p-toluenesulfonyl chloride

Chemical Papers ◽

10.2478/s11696-012-0253-0 ◽

2013 ◽

Vol 67 (2) ◽

Cited By ~ 3

Author(s):

Belladamadu Anandakumar ◽

Muthukur Madhusudana Reddy ◽

Kumarappa Thipperudraiah ◽

Mohamed Pasha ◽

Gujjarahalli Chandrappa

Keyword(s):

Significant Loss ◽

Area Measurement ◽

Bet Surface Area ◽

Basic Site ◽

Solution Combustion ◽

Reaction Conditions ◽

Efficient Catalyst ◽

Surface Area Measurement ◽

First Time

AbstractA simple and rapid synthesis of CdO nanopowder via the solution combustion route employing l-(+)-tartaric acid as a fuel is reported for the first time. The catalyst was characterized by PXRD, SEM, TEM, BET surface area measurement, basic site measurement from back titration and FTIR. Combustion derived CdO nanopowder acts as a catalyst in the sulfonylation of amines with p-toluenesulfonyl chloride to obtain sulfonamides in excellent yield (85–95 %) and high purity under mild reaction conditions. CdO nanopowder has been found to be an efficient catalyst requiring a shorter reaction time (10–30 min) to obtain sulfonamide when compared with the commercial CdO powder requiring 2 h under similar conditions. The catalyst can be recovered and reused four times without any significant loss of catalytic activity. Potential role of CdO nanopowder in the synthesis of sulfonamides and its mechanism is proposed.

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3‑Mercapto‑propanoic acid modified cellulose filter paper for quick removal of arsenate from drinking water

International Journal of Biological Macromolecules ◽

10.1016/j.ijbiomac.2018.10.065 ◽

2019 ◽

Vol 122 ◽

pp. 185-194 ◽

Cited By ~ 7

Author(s):

Krishnendu Pramanik ◽

Priyabrata Sarkar ◽

Dipankar Bhattacharyay

Keyword(s):

Drinking Water ◽

Filter Paper ◽

Propanoic Acid ◽

Cellulose Filter ◽

Modified Cellulose

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Catalyst-Free Three-Component Synthesis of Spirobenzimidazolidines Bearing an Indole Scaffold

Synlett ◽

10.1055/s-0037-1609950 ◽

2018 ◽

Vol 29 (17) ◽

pp. 2301-2305 ◽

Cited By ~ 3

Author(s):

F. Moghaddam ◽

A. Moafi ◽

Z. Zamani ◽

M. Daneshfar

Keyword(s):

Reaction Times ◽

Reaction Conditions ◽

One Pot ◽

Efficient Catalyst ◽

Catalyst Free ◽

New Family ◽

Three Component Reaction ◽

High Yields ◽

First Time ◽

Derivatives Of

An efficient catalyst-free one-pot three-component reaction was developed for the synthesis of a new family of N- and S-containing spirocyclic compounds. Various derivatives of spirobenzimidazolidine containing an indole scaffold were synthesized for the first time in a modestly toxic solvent and under mild reaction conditions. The reaction times were of the order of several minutes, and all the products were obtained in moderate to high yields (overall yields 58–80%).

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Graphene/Carbon Paper Combined with Redox Active Electrolyte for Supercapacitors with High Performance

Polymers ◽

10.3390/polym11081355 ◽

2019 ◽

Vol 11 (8) ◽

pp. 1355

Author(s):

Yanlin Xia ◽

Youtian Mo ◽

Wei Meng ◽

Xusheng Du ◽

Chuanguo Ma

Keyword(s):

Filter Paper ◽

High Performance ◽

Electrode Materials ◽

Carbon Paper ◽

Free Standing ◽

Redox Active ◽

Binder Free ◽

Good Cycling Stability ◽

Cellulose Filter ◽

Modified Cellulose

Graphene/carbon paper is prepared by pyrolyzing graphene modified cellulose filter paper and directly used as a binder-free electrode to assemble a supercapacitor (SC) with a redox active electrolyte, containing a Fe3+/Fe2+ additive. By the graphene incorporation and the carbonization of the cellulose fibers, both the microstructure and the electrical conductivity of the carbon paper are promoted greatly. The filter paper derived carbon (FPC) electrode exhibits a specific capacitance (Cs) of 2832 F·g−1 in a 1 M H2SO4 + 0.5 M Fe3+/Fe2+ electrolyte at 1 A·g−1, which is about 81 times that in a normal H2SO4 electrolyte. With the modification of graphene, the capacitive performance of the SC is enhanced further and a remarkable Cs of 3396 F·g−1 at 1 A·g−1 is achieved for a graphene modified filter paper carbon (GFPC) electrode, which remains at ~632 F·g−1 at 10 A·g−1. The free standing GFPC electrode also exhibits good cycling stability (93.8% of capacitance retention after 2000 cycles) and an energy density of 118 Wh·kg−1 at a power density of 500.35 W·kg−1, all of which are much higher than those of FPC. These encouraging results suggest that the graphene modification of electrode materials combined with a Fe3+/Fe2+ redox active electrolyte is a prospective measure to fabricate SC with an ultrahigh performance.

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Development and validation of dot-ELISA on modified cellulose filter paper: a simplified novel approach

Analytical Methods ◽

10.1039/c4ay01368a ◽

2014 ◽

Vol 6 (18) ◽

pp. 7374-7383 ◽

Cited By ~ 1

Author(s):

Charu Tyagi ◽

Lomas K. Tomar ◽

Pradeep Kumar ◽

Viness Pillay ◽

Harpal Singh

Keyword(s):

Mass Screening ◽

Filter Paper ◽

Epidemiological Studies ◽

Field Conditions ◽

Specificity And Sensitivity ◽

Novel Approach ◽

Dot Elisa ◽

Development And Validation ◽

Cellulose Filter ◽

Modified Cellulose

GMA-g-CFP matrix validated for dot-ELISA exhibits specificity and sensitivity comparable to the commercial NC membrane and is relevant for mass screening in field conditions as in epidemiological studies.

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