Abstract：
:Chitosan (CHI)-paramagnetic ion interactions in aqueous solution as affected by pH were studied using time-domain NMR (TD-NMR) relaxometry. Longitudinal (T1) and transverse (T2) relaxation times of CHI solutions with Fe3+, Cu2+, and Mn2+ were measured using a single-shot pulse sequence named CP-CWFPx-x. The results indicate that CHI interacted with Fe3+ ions or iron oxide nanoparticles, maintaining the metal ion in solution at pH ranging from 3 to 5. Above this pH, CHI coagulated and removed Fe ions or nanoparticles, resulting in a clear supernatant. CHI probably interacted with Cu ions at pH 6.2 through the deprotonated CHI-NH2 groups maintaining the relaxation effect in alkaline solution, whereas Mn2+ did not interact with CHI strongly enough to produce a complex of high stability. The proposed method can also be further exploited in the study of interactions paramagnetic ions with others CHI and CHI derivatives as well as of other water-soluble polysaccharides.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Kock FV,Monaretto T,Colnago LAdoi
10.1016/j.ijbiomac.2017.01.083subject
Has Abstractpub_date
2017-05-01 00:00:00pages
228-232eissn
0141-8130issn
1879-0003pii
S0141-8130(16)32580-6journal_volume
98pub_type
杂志文章abstract：:In recent years, aging has been reported to be regulated by HAT. In this study, the inhibitory effects of spermidine on the matrix metalloproteinase-2 (MMP-2) activity and expression were investigated in human dermal fibroblasts (HDFs). It was observed that spermidine inhibits MMP-2 activity and expression. In additio...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2012.08.013
更新日期：2012-12-01 00:00:00
abstract：:Structural changes in R-phycoerythrin used as a matrix for the synthesis of CdS quantum dots have been analyzed by circular dichroism spectrometry. In deionized water, quantum dot synthesis in the tunnel cavity of the R-phycoerythrin molecule proved to be accompanied by uncoiling of α-helices and changes in the confor...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2013.10.010
更新日期：2013-11-01 00:00:00
abstract：:The aim of this research is to investigate the effect of sugar palm fibre (SPF) on the mechanical, thermal and physical properties of seaweed/thermoplastic sugar palm starch agar (TPSA) composites. Hybridized seaweed/SPF filler at weight ratio of 25:75, 50:50 and 75:25 were prepared using TPSA as a matrix. Mechanical,...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2017.01.079
更新日期：2017-04-01 00:00:00
abstract：:Pectin has been widely used in a variety of biomedical applications. In this study, it was modified with sodium periodate as an oxidant and characterized by physicochemical methods Periodate oxidation increased the contents of dialdehyde units and carboxyl groups in pectin, and a decrease in pectin viscosity was measu...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2017.01.018
更新日期：2017-04-01 00:00:00
abstract：:Transdermal drug delivery systems are topically administered medicaments in the form of patches that deliver drugs for systemic effects at a predetermined and controlled rate. It works very simply in which drug is applied inside the patch and it is worn on skin for long period of time. Polymer matrix, drug, permeation...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2014.05.062
更新日期：2014-08-01 00:00:00
abstract：:Brasenia schreberi (B. schreberi) is a rare and precious vegetable, which coat with a gelatinous mucilage. This study is aiming to investigate the relationship between structural characteristics and hypoglycemic activities of polysaccharides with different molecular weight (Mw) range. Three polysaccharides fractions, ...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2019.05.129
更新日期：2019-08-15 00:00:00
abstract：:Protein phosphorylations have essential regulatory roles in visual signaling. Previously, we found that phosphorylation of several proteins in the retina and retinal pigment epithelium (RPE) is involved in anti-apoptotic signaling under oxidative stress conditions, including light exposure. In this study, we used a ph...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2010.11.006
更新日期：2011-01-01 00:00:00
abstract：:A novel biopolymer-based superporous hydrogel (SPH) was synthesized through chemical crosslinking by graft copolymerization of 2-hydroxyethyl methacrylate (HEMA) and acrylic acid (AA) on to xanthan gum (XG) via redox initiator system of ammonium persulfate (APS) and N, N, N', N'-tetramethylethylenediamine (TMED), in t...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2009.07.007
更新日期：2009-11-01 00:00:00
abstract：:In recent years, an enormous number of naturally occurring biological macromolecules has been reported worldwide due to its antibacterial and anticancerous potential. Among them, in this study, the copper containing respiratory protein namely haemocyanin (HC) was isolated from the haemolymph of mud crab Scylla serrata...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.08.228
更新日期：2020-12-01 00:00:00
abstract：:Silica nanoparticles (SiO2 NPs) have been widely used in the medical and food sciences. However, their toxic effects against bio-macromolecules and cells are not well understood. The present study was aimed to investigate the adverse effects of fabricated SiO2 NPs on the human hemoglobin (Hb) by FTIR, CD, fluorescence...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2018.06.128
更新日期：2018-10-15 00:00:00
abstract：:Astragalus polysaccharide (APS) is a bioactive macromolecule, which has been used to alleviate the development of Parkinson's disease (PD), while its mechanism is still unresolved. As is generally accepted that autophagy has an important link with PD, thus it is reasonable to hypothesize that APS was involved in autop...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.02.282
更新日期：2020-06-15 00:00:00
abstract：:Recently, protein purification methods have a very wide area of research. Many of these methods are both expensive and multi-stage methods, that are needed in specific equipment. In this study, biopolymer coated magnetic nanoparticles, carboxymethyl cellulose (CMC) and chitosan (CH) coated Fe3O4 (magnetite) nanocompos...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2016.12.042
更新日期：2017-03-01 00:00:00
abstract：:Sterilization of milk protein without heating is of great interest. Gamma irradiation is a very powerful method to decontaminated casein. Gamma-irradiation of proteins in aqueous media at doses higher than 5kGy is known to induce their aggregation (without oxygen) or degradation (in presence of oxygen). Camellia sinen...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2011.01.003
更新日期：2011-04-01 00:00:00
abstract：:Starch lamellar structures unraveled by small angle X-ray scattering (SAXS) have been critically correlated with its functionalities. However, the lamellar features calculated by the classical linear correlation function based on SAXS data are not well convincingly analyzed, because the thickness of amorphous lamellae...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2019.09.054
更新日期：2019-12-01 00:00:00
abstract：:Development of a gastroretentive sustained release tablet of metformin based on poly (acrylic acid)-grafted-gellan (PAAc-g-GG) is the main purpose of this study. At first, PAAc-g-GG was synthesized by microwave-promoted free radical initiation method using cerric (IV) ammonium nitrate (CAN) as redox initiator and char...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2016.12.022
更新日期：2017-03-01 00:00:00
abstract：:Lyophilized wafers comprising sodium alginate (SA) and gelatin (GE) (0/100, 75/25, 50/50, 25/75, 0/100 SA/GE, respectively) with silver sulfadiazine (SSD, 0.1% w/w) have been developed for potential application on infected chronic wounds. Polymer-drug interactions and physical form were characterized by Fourier transf...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2015.04.048
更新日期：2015-08-01 00:00:00
abstract：:Ovotransferrin (OVT), a glycoprotein from avian egg, which has a variety of biological activities and immunomodulatory effects. The purpose of this research was to demonstrate the effect of OVT on intestinal immunomodulatory function which used a mouse model of cyclophosphamide (CP) induced intestinal immunosuppressio...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2018.08.058
更新日期：2018-12-01 00:00:00
abstract：:The hydrolysis of the plant biomass provides many interesting opportunities for the generation of building blocks for the green chemistry industrial applications. An important progress has been made for the hydrolysis of the cellulosic component of the biomass while, for the hemicellulosic components, the advances are...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2018.05.157
更新日期：2018-10-01 00:00:00
abstract：:The aim of this study was to improve the physicochemical stability of neohesperidin (NH) using nanoliposomal encapsulation in association with surface decoration strategy employing chitosan (CH) and pectin (P). Different nanoliposomal systems, i.e. NH-loaded nanoliposome (NH-NL), CH-coated NH-NL (CH-NH-NL), and P-coat...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.08.174
更新日期：2020-12-01 00:00:00
abstract：:The purpose of this investigation was to develop Poly (D,L Lactide-co-Glycolide) (PLGA)/poloxamer nanoparticles (NPs) of the hydrophilic drug Zolmitriptan using quality-by-design approach for brain targeting. Randomized 2(4) full factorial design was employed to achieve the critical quality attributes of minimized par...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2015.12.069
更新日期：2016-04-01 00:00:00
abstract：:Roasting may be beneficial to extend the shelf life by inactivating the lipases and peroxidases in highland barley, but it may lead to the deterioration of starch quality. In this study, the pre-treatment techniques of pearling and tempering were tried to improve the efficiency of inactivation, and different roasting ...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.09.180
更新日期：2020-12-15 00:00:00
abstract：:Our previous study suggested that extrusion can enhance the soluble dietary fiber (SDF) and improve the physicochemical properties of fiber-rich orange pomace (OP). The aim of this study was to determine the predictive indices for the hypoglycemic, hypocholesterolemic, and fermentation capacities of extruded orange po...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2018.11.249
更新日期：2019-03-01 00:00:00
abstract：:A novel flame retardant (FR), the ammonium salt of citrulline-penta (methylphosphonic acid) (ACPMPA) based on L-citrulline was synthesized, and its structure was characterized by 13C, 1H, and 31P nuclear magnetic resonance (NMR) spectroscopy. The ACPMPA flame retardant molecule contains five ammonium salts of phosphor...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.11.022
更新日期：2021-01-01 00:00:00
abstract：:A novel diethoxy phosphoryl chitosan was successfully synthesized via Atherton-Todd reaction of chitosan with diethyl phosphite, and the characterization was carried out by FT IR, NMR, ICP, XRD, TG and SEM, respectively. The FT IR, (13)C NMR and (31)P NMR results showed that diethoxy phosphoryl group was grafted onto ...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2010.06.014
更新日期：2010-11-01 00:00:00
abstract：:4-O-Methylglucuronoxylans (MGX) were isolated from chestnut wood sawdust using two different procedures: chlorite delignification followed by the classical alkaline extraction step, and an unusual green chemistry process of delignification using phthalocyanine/H2O2 followed by a simple extraction with hot water. Antio...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2014.07.005
更新日期：2014-09-01 00:00:00
abstract：:Debranching of (1, 6)-α-linkages in starch is of great significance as it is widely used in different industries. In recent years, identifying a single potential enzyme that could debranch (1, 6)-α-linkages and cleave (1, 4)-α-linkages brought great interest as amylopectin possessed both (1, 4)-α- and (1, 6)-α-linkage...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2017.03.129
更新日期：2017-08-01 00:00:00
abstract：:New details of chemical structure of Araucaria lignin are the focus of this paper, since Araucaria is a relict plant which fossils are dated by the Permian period. Quantitative chemical analysis, FTIR, EPR and 2D NMR spectroscopies, Py-GC/MS and nitrobenzene oxidation have been used to characterize the Araucaria ligni...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2020.05.150
更新日期：2020-09-15 00:00:00
abstract：:This paper describes the use of a protocol for conformational analysis of oligosaccharide structures related to the cell-wall polysaccharide of Streptococcus group A. The polysaccharide features a branched structure with an L-rhamnopyranose (Rhap) backbone consisting of alternating alpha-(1-->2) and alpha-(1-->3) link...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/0141-8130(95)92678-j
更新日期：1995-06-01 00:00:00
abstract：:Enormous masses of keratinous wastes are annually accumulated in the environment as byproducts of poultry processing and agricultural wastes. Keratin is a recalcitrant fibrous protein, which represents the major constituent of various keratin-rich wastes, which released into the environment in the form of feathers, ha...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章,评审
doi：10.1016/j.ijbiomac.2020.03.116
更新日期：2020-07-01 00:00:00
abstract：:Lectins are proteins capable of specific and reversible binding to mono- and/or oligosaccharides, and within this group, Legume lectins are the most studied. However, most of these studies focus on the Papilionoideae subfamily, with Caesalpinioideae and Mimosoideae lectins being significantly less explored in the lite...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章,评审
doi：10.1016/j.ijbiomac.2020.03.113
更新日期：2020-07-01 00:00:00
