Abstract：
:Metal-catalysed reduction of nitroaromatic compounds to aniline derivatives is a useful and important synthetic route in many applications. Metallic silver particles have gained much recent interest as efficient catalysts in catalytic reduction of nitroaromatic compounds by sodium borohydride. In the study metallic Ag particles were stabilized on glutaraldehyde cross-linked chitosan gel beads in water by a simple and green thermal treatment. Ag(0)@chitosan gel beads exhibited an excellent catalytic activity in hydrogenation of 4-nitrophenol, 2-nitroaniline, 4-nitro-o-phenylenediamine and 2,4-dinitrophenol when NaBH4 was used as the hydrogen source. The catalytic activity tests were repeated by varying the catalyst dose, NaBH4 concentration, the amount of nitroaromatic compounds and temperature. The reduction reactions were greatly affected by the temperature of reaction medium and the concentration of NaBH4. At elevated temperatures, for example at 43 °C, some reduction reactions went to completion in just 8 s. The study revealed that Ag(0)@chitosan gel beads can be used in catalytic reduction of nitroaromatic compounds to anilines by NaBH4. This catalytic system can be tested an alternative to the catalytic systems requiring use of expensive transition metals such as palladium and platinum.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Sargin Idoi
10.1016/j.ijbiomac.2019.07.018subject
Has Abstractpub_date
2019-09-15 00:00:00pages
576-582eissn
0141-8130issn
1879-0003pii
S0141-8130(19)33851-6journal_volume
137pub_type
杂志文章abstract：:Co-aggregation plays an important role in processing protein-rich food materials under heterogeneous conditions. The main cause of co-aggregation is an electrostatic attraction between oppositely charged molecules. This study investigated thermal aggregation of β-lactoglobulin (BLG) (pI=5.1) and lysozyme (LYZ) (pI=10....
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2017.10.004
更新日期：2018-02-01 00:00:00
abstract：:A new hoop shaped three dimensional chitin was obtained successfully from the body segment of a diplopod species (Ommatoiulus sabulosus) by following the procedure decolorization, demineralization and deproteinization. Purity of the hoop shaped three-dimensional chitin was proved by FT-IR analysis and chitinase digest...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2016.09.103
更新日期：2017-01-01 00:00:00
abstract：:Myxovirus resistance (Mx) proteins represents the subclass of the dynamin superfamily of large Guanosine triphosphates (GTPases), play esential role in intracellular vesicle trafficking, endocytosis, organelle homeostasis and mitochondria distribution. These proteins are key players of the vertebrate immune system, in...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2019.06.161
更新日期：2019-09-01 00:00:00
abstract：:We have found that polyacrylamide gels cross-linked with bisacrylamide induce a larger macromolecular osmotic pressure than the non cross-linked gels. This means also that in the cross-linked gels hydration water is held more tightly to the polymer, i.e., more work is needed to remove water, than in the non cross-link...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2004.11.002
更新日期：2005-03-01 00:00:00
abstract：:Crude polysaccharides (MPS) from soybean residue fermented with Morchella esculenta were extracted and purified by DEAE Sephadex A-50 chromatography and Sephadex G-100 size-exclusion chromatography in sequence. Three main fractions MP-1, MP-3 and MP-4 were obtained during the purification steps. The recovery rates bas...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2016.12.007
更新日期：2017-03-01 00:00:00
abstract：:Three fractions of the endo-polysaccharides from the mycelium of Hericium erinaceus (HEP) grown on tofu whey were obtained by the fractional precipitation with gradient concentrations of ethanol (HEP40, HEP60 and HEP80). The chemical and physical characteristics of the three crude polysaccharides were investigated by ...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2012.09.002
更新日期：2012-12-01 00:00:00
abstract：:Hydrodynamic data, i.e. intrinsic viscosity and sedimentation coefficient, for denatured globular proteins in 6 M guanidinium chloride have been re-analysed in terms of the Yamakawa-Fujii theory of the wormlike cylinder model. Molecular parameters thus obtained ((mean value of R2 0/M) infinity, the Kuhn statistical se...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/0141-8130(91)90078-9
更新日期：1991-08-01 00:00:00
abstract：:This study investigated the impact of citric acid modification combined with alcoholic-alkaline treatment on physicochemical, textural and rheological properties of sorghum and corn starches. Both starches were modified with citric acid (CA) using concentrations (20 and 40%) w/w and were named as SCA and CCA, respecti...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2019.10.143
更新日期：2020-05-01 00:00:00
abstract：:Flammulina velutipes polysaccharides (FVP) can improve gut health through gut microbiota and metabolism regulation. In this study, the 28-days fed experiment was used to investigate gut microbime and metabolic profiling induced by FVP. After treatment, intestinal tissue section showed the higher villus height and vill...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.11.085
更新日期：2021-01-15 00:00:00
abstract：:Bone is a highly integrative and dynamic tissue of the human body. It is continually remodeled by bone cells such as osteoblasts, osteoclasts. When a fraction of a bone is damaged or deformed, stem cells and bone cells under the influence of several signaling pathways regulate bone regeneration at the particular local...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章,评审
doi：10.1016/j.ijbiomac.2017.09.029
更新日期：2018-04-15 00:00:00
abstract：:Pullulan (PU) is an exo-polysaccharide used in the food and pharmaceutical industries. However, the use of PU in different industries is limited due to its highly hydrophilic nature and consequently weakness in surface properties which can be remedied by its chemical modification with octenyl succinic anhydride (OSA)....
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.08.158
更新日期：2020-12-01 00:00:00
abstract：:Salecan is a novel water-soluble extracellular β-glucan and suitable for the hydrogel preparation due to its excellent physicochemical and biological properties. The present article describes the fabrication and characterization of a pH/magnetic field-driven hydrogel based on salecan-g-poly(vinylacetic acid-co-2-hydro...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2017.12.018
更新日期：2018-03-01 00:00:00
abstract：:The discovery of genes responsible for the production of bioactive metabolites via metabolic pathways combined with the advances in synthetic biology tools, has allowed the establishment of numerous microbial cell factories, for instance the yeast cell factories, for the manufacture of highly useful metabolites from r...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章,评审
doi：10.1016/j.ijbiomac.2018.01.149
更新日期：2018-06-01 00:00:00
abstract：:Carboxymethyl-chitosan (CMC)/bentonite composite was prepared by the method of membrane-forming, and characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. The simultaneous adsorption of Cu2+ and Acid fuchsin (AF) applying CMC/bentonite composite as an adsorbent in sing...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2018.04.075
更新日期：2018-08-01 00:00:00
abstract：:The objectives of this paper were to investigate some physicochemical properties of Prunus armeniaca L. gum exudates (PAGE). PAGE had, on average, 66.89% carbohydrate, 10.47% uronic acids, 6.9% moisture (w.b.), 2.91% protein, 4% ash and 1.59% fat. PAGE was composed of monosaccharides including l-arabinose, d-galactose...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2015.09.068
更新日期：2016-01-01 00:00:00
abstract：:This deals with fabrication of macromolecular prodrugs (MPDs) of salicylic acid (SA) and aspirin (ASP) based on a hydrophilic cellulose ether, hydroxyethyl cellulose (HEC). Degrees of substitution (DS) of SA and ASP per HEC repeating unit (HEC-RU) were achieved ranging from 0.60 to 2.18 and 0.53 to1.50, respectively. ...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2017.05.061
更新日期：2017-10-01 00:00:00
abstract：:Transglycosylation (TG) by Enterobacter cloacae subsp. cloacae chitinase 2 (EcChi2) has been deciphered by site-directed mutagenesis. EcChi2 originally displayed feeble TG with chitin oligomer with a degree of polymerization (DP4), for a short duration. Based on the 3D modelling and molecular docking analyses, we alte...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.10.125
更新日期：2020-12-15 00:00:00
abstract：:Chlorocatechol 1,2-dioxygenase (1,2-CCD) is a non-heme iron protein involved in the intradiol cleavage of aromatic compounds that are recalcitrant to biodegradation. In particular, 1,2-CCD catalyzes the conversion of catechol and its halogenated derivatives to cis-cis muconic acid. In this study we describe a series o...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2010.04.016
更新日期：2010-08-01 00:00:00
abstract：:In spite of the fact that amyloid related neurodegenerative illnesses and non-neuropathic systemic amyloidosis have allured the research endeavors, as no cure has been announced yet apart from symptomatic treatment. Therapeutic agents which can reduce or disaggregate those toxic oligomers and fibrillar species have be...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2017.03.028
更新日期：2017-06-01 00:00:00
abstract：:Despite the use of layered double hydroxides (LDH) in different electrochemical (bio)sensors, the construction of aptasensors using LDH-based surfaces was not reported to the best of our knowledge. This may be due to the lack of a suitable linker to attach aptamers to the LDH-modified surface. LDH-based aptasensors ar...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.10.063
更新日期：2021-01-01 00:00:00
abstract：:The present study aimed to evaluate the antidepressant-like effect of a polysaccharide (OP), which is isolated from okra (Abelmoschus esculentus (L) Moench), in CUMS-induced mice and its possible mechanisms. OPT, FST and TST were employed to examine the anxiety and depressive behavior in CUMS-induced mice and fecal mi...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2019.12.138
更新日期：2020-02-01 00:00:00
abstract：:An agar-degrading bacterium, strain BN3, was isolated from a coastal soil sample collected in Taiwan Strait, China and identified to be a novel species of the genus Microbulbifer. The gene (N3-1) encoding for a novel β-agarase from the isolate was cloned and sequenced. It encoded a mature protein with 274 amino acids ...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2018.08.053
更新日期：2018-11-01 00:00:00
abstract：:An arabinogalactan (ICPA) was isolated from the water extract of Ixeris chinensis (Thunb.) Nakai. ICPA was mainly composed of galactose and arabinose with minor amount of glucose. The molecular weight of ICPA was 58.1 kDa. Structural analysis by methylation and NMR spectroscopy indicated that ICPA contained α-D-Glcp(1...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2019.09.158
更新日期：2020-01-15 00:00:00
abstract：:Various materials, both biological and alloplastic, have been used for mastoid obliteration after canal wall-down mastoidectomy in chronic otitis media. The purpose of this study is to investigate the osteoinductive potential of PCL scaffolds in mastoid obliteration, and to test that osteoinductivity can be enhanced b...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2013.10.011
更新日期：2013-11-01 00:00:00
abstract：:Agrobacterium tumefaciens uronate dehydrogenase (AtuUdh) belongs to the short-chain dehydrogenase superfamily, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. It is apparently required for the production of D-glucaric acid. AtuUdh-catalyzed reaction is reversible with dual substra...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2019.08.194
更新日期：2019-11-01 00:00:00
abstract：:Controlled release of antimicrobial and antioxidant compounds from packaging films is of utmost importance for extending the shelf-life of perishable foods. This study focused on the mathematical modeling of gallic acid release into an aqueous medium from three chitosan films, formulated with grape seed extract (GSE) ...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2017.05.187
更新日期：2017-11-01 00:00:00
abstract：:In this study, lipase (LIP) was isolated from Aspergillus crevinus, statistically optimized and purified via ammonium sulfate fractionation (ASF), and Sephadex G-100 gel permeation chromatography. LIP was 2.26-folds purified with a specific activity of 223.60 U/mg. The molecular mass was estimated to be 60 kDa on sodi...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2018.07.192
更新日期：2018-11-01 00:00:00
abstract：:The pathways of melanization and sclerotization of the cuticle in insects are carried out by the action of laccases on dopamine and related compounds. In this work, the laccase action of Trametes versicolor (TvL) on catecholamines and related compounds has been kinetically characterized. Among them, dopamine, l-dopa, ...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.07.112
更新日期：2020-12-01 00:00:00
abstract：:Three anionic chitosan surfactant with different hydrophobic tails labeled Chitosan-R8, Chitosan-R12 and Chitosan-R16 were prepared and their surface behavior in aqueous solution was determined by surface tension measurements at three different temperatures 20, 40 and 60 °C. The affinity of the synthesized anionic chi...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.04.184
更新日期：2020-08-15 00:00:00
abstract：:An antimicrobial packaging material was developed by uniformly embedding 1, 3 and 5% chitosan (w/w) in low density polyethylene matrix using maleic anhydride grafted LDPE as a compatible agent. The materials were mixed by compounding and blown into monolayer films via blown film extrusion. The developed films showed g...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2015.06.016
更新日期：2015-08-01 00:00:00
