Production of Alginate from Persian Gulf Sargassum angustifolium Seaweeds: Novel Extraction and Characterization Methods

Background: Brown seaweeds contain polysaccharides, minerals, proteins, pigments, polyphenols, and fatty acids. Several of these compounds show a wide range of biological activities, such as anticoagulant, anti-tumor, antiviral, and anti-cancer effects. Objectives: This study was designed to evaluate the extraction, purification, and characterization of alginate from Sargassum angustifolium simultaneous with fucoidan extraction and the effect of this process on the structure and properties of alginate. Methods: The extraction of alginate from S. angustifolium was carried out using defatting with organic solvents mixture, treatment with acid-base solutions, and purification with absolute ethanol. The novel characterization of this compound was carried out by the Fourier transform infrared spectroscopy (FT-IR), FT-NMR, energy dispersive X-ray (EDX), and florescent spectrophotometry methods. Results: The fluorescent emission of alginate showed 66.54% removal of impurities, such as phenolic compounds. The FT-IR analysis showed the carboxyl and hydroxyl groups as significant signals in the alginate structure. By analyzing the anomeric protons and other aspects of 1H-NMR, M/G ratio, FG, FM, FGG, FMM, FMG (or FGM) were determined to be 0.61, 0.62, 0.38, 0.31, 0.07, and 0.31, respectively. The intrinsic viscosity and molecular weight of alginate were 0.9 dL/g and 41.53 kDa, respectively. Conclusions: The total amount of alginate from the residual S. angustifolium was 17% of dried seaweed. The structure elucidation of alginate was performed with the FT-IR, FT-NMR, and EDX methods.

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Synthesis, Fabrication, and Characterization of Functionalized Polydiacetylene Containing Cellulose Nanofibrous Composites for Colorimetric Sensing of Organophosphate Compounds

Nanomaterials ◽

10.3390/nano11081869 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1869

Author(s):

A K M Mashud Alam ◽

Donovan Jenks ◽

George A. Kraus ◽

Chunhui Xiang

Keyword(s):

Solid State ◽

Hydroxyl Groups ◽

Colorimetric Sensing ◽

Electrospinning Technique ◽

Hazardous Chemical ◽

Tensile Tester ◽

Vis Spectroscopy ◽

Ft Ir ◽

Landmark Study

Organophosphate (OP) compounds, a family of highly hazardous chemical compounds included in nerve agents and pesticides, have been linked to more than 250,000 annual deaths connected to various chronic diseases. However, a solid-state sensing system that is able to be integrated into a clothing system is rare in the literature. This study aims to develop a nanofiber-based solid-state polymeric material as a soft sensor to detect OP compounds present in the environment. Esters of polydiacetylene were synthesized and incorporated into a cellulose acetate nanocomposite fibrous assembly developed with an electrospinning technique, which was then hydrolyzed to generate more hydroxyl groups for OP binding. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), Instron® tensile tester, contact angle analyzer, and UV–Vis spectroscopy were employed for characterizations. Upon hydrolysis, polydiacetylene esters in the cellulosic fiber matrix were found unaffected by hydrolysis treatment, which made the composites suitable for OP sensing. Furthermore, the nanofibrous (NF) composites exhibited tensile properties suitable to be used as a textile material. Finally, the NF composites exhibited colorimetric sensing of OP, which is visible to the naked eye. This research is a landmark study toward the development of OP sensing in a protective clothing system.

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Development and characterization of electrospun curcumin-loaded antimicrobial nanofibrous membranes

Textile Research Journal ◽

10.1177/0040517520925514 ◽

2020 ◽

pp. 004051752092551

Author(s):

Javeed A Awan ◽

Saif Ur Rehman ◽

Muhammad Kashif Bangash ◽

Fiaz Hussain ◽

Jean-Noël Jaubert

Keyword(s):

Biological Activities ◽

Research Work ◽

Medical Applications ◽

Electrospinning Technique ◽

Naturally Occurring ◽

Wide Range ◽

Nanofibrous Membranes ◽

Antimicrobial Barrier ◽

Anti Hiv

Curcumin is a naturally occurring hydrophobic polyphenol compound. It exhibits a wide range of biological activities such as antibacterial, anti-inflammatory, anti-carcinogenic, antifungal, anti-HIV, and antimicrobial activity. In this research work, antimicrobial curcumin nanofibrous membranes are produce by an electrospinning technique using the Eudragit RS 100 (C19H34ClNO6) polymer solution enriched with curcumin. The morphology and chemistry of the membrane are analyzed using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Kirby Bauer disk diffusion tests are carried out to examine the antibacterial effectiveness of the membrane. Experimental results show that the nanofibers produced are of uniform thickness morphology and curcumin is successfully incorporated into the nanofibrous mat, while no chemical bonding was observed between curcumin and the polymer. The antimicrobial curcumin nanofibrous membranes can be effectively applied as antimicrobial barrier in a wide variety of medical applications such as wound healing, scaffolds, and tissue engineering.

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Synthesis and Characterization of an Alendronate-Chitosan Conjugate

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.140.53 ◽

2011 ◽

Vol 140 ◽

pp. 53-57 ◽

Cited By ~ 5

Author(s):

Xiao Hong Shao ◽

Ji Qing Xu ◽

Yan Peng Jiao ◽

Chang Ren Zhou

Keyword(s):

Drug Delivery ◽

Drug Delivery System ◽

Synthesis And Characterization ◽

Hydroxyl Groups ◽

Amino Groups ◽

H Nmr ◽

Ft Ir ◽

Novel Drug Delivery System ◽

Novel Drug

The biomineral-binding alendronate-chitosan conjugate (Scheme 1) was developed as a novel drug delivery system. Alendronate was conjugated to the hydroxyl groups of chitosan, thereby maintaining the amino groups of chitosan intact. By means of FT-IR and 1H NMR, the characterization was conducted to confirm the successful synthesis of alendronate-chitosan conjugate.

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Transcrystallization of Isotactic Polypropylene/Bacterial Cellulose Hamburger Composite

Polymers ◽

10.3390/polym11030508 ◽

2019 ◽

Vol 11 (3) ◽

pp. 508 ◽

Cited By ~ 2

Author(s):

Bo Wang ◽

Fu-hua Lin ◽

Xiang-yang Li ◽

Xu-ran Ji ◽

Si-xiao Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Bacterial Cellulose ◽

Isotactic Polypropylene ◽

Crystallization Rate ◽

Sem Analysis ◽

Hydroxyl Groups ◽

Hot Press ◽

Ft Ir ◽

Ir Analysis ◽

The Fourier Transform

Isotactic polypropylene (iPP) is a commonly used thermoplastic polymer with many excellent properties. But high brittleness, especially at low temperatures, limits the use of iPP. The presence of transcrystallization of iPP makes it possible for fiber-reinforced iPP composites with higher strength. Bacterial cellulose (BC) is a kind of cellulose with great potential to be used as a new filler to reinforce iPP due to its high crystallinity, biodegradability and efficient mechanical properties. In this study, the iPP/BC hamburger composite was prepared by a simple hot press and maleic anhydride grafted polypropylene (MAPP) was used to improve the interface compatibility of iPP and BC. The polarizing microscope (POM) photograph shows that BC successfully induces the transcrystallization of iPP. The differential Scanning Calorimeter (DSC) date proves that the addition of BC could improve the thermal properties and crystallization rate of the composite. Especially, this change is more obvious of the iPP/MAPP/BC. The mechanical properties of the iPP/BC composites were greatly increased. This DSC date is higher than BC; we used BC particles to enhance the iPP in our previous research. The scanning Electron Microscope (SEM) analysis intuitively shows that the interface of the iPP/MAPP/BC is more smooth and flat than the iPP/BC. The fourier Transform infrared spectroscopy (FT-IR) analysis of the iPP/BC hamburger composites was shown that a new C=O group vibration appeared at 1743 cm−1, which indicated that the hydrogen bond structure of BC molecules was weakened and some hydroxyl groups were substituted after modification which can increase the lipophilicity of BC. These results indicated that the BC fiber can easily induce the transcrystallization of iPP, which has excellent mechanical properties. Moreover, the addition of MAPP contributes greatly to the interface compatibility of iPP and BC.

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Efficient Synthesis and Characterization of Some Novel Nitro-Schiff Bases and Their Complexes of Nickel(II) and Copper(II)

Journal of Chemistry ◽

10.1155/2013/701826 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

Hossein Naeimi ◽

Mohsen Moradian

Keyword(s):

Schiff Base ◽

Schiff Base Complexes ◽

Synthesis And Characterization ◽

Planar Geometry ◽

Hydroxyl Groups ◽

Spectroscopic Techniques ◽

Spectral Techniques ◽

Chemical Structures ◽

Ft Ir

Synthesis and characterization of some new Schiff base ligands derived from various diamines and nitrosalicylaldehyde and their complexes of Ni(II) and Cu(II) are reported. Several spectral techniques such as UV-Vis, FT-IR, and NMR spectra were used to identify the chemical structures of the reported ligands and their complexes. The ligands are found to be bound to the metal atom through the oxygen atoms of the hydroxyl groups and nitrogen atoms of imine groups, which is also supported by spectroscopic techniques. The results obtained by FT-IR and NMR showed that the Schiff base complexes of transition metal (II) have square-planar geometry.

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Surface Grafting Modification of Silk Fibroin by Atom Transfer Radical Polymerization

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.373-374.629 ◽

2008 ◽

Vol 373-374 ◽

pp. 629-632 ◽

Cited By ~ 7

Author(s):

Tie Ling Xing ◽

Hai Jiang Wang ◽

Zhan Xiong Li ◽

Guo Qiang Chen

Keyword(s):

Silk Fibroin ◽

Gel Permeation Chromatography ◽

Catalyst System ◽

Hydroxyl Groups ◽

Amino Groups ◽

Grafting Modification ◽

Antibacterial Surface ◽

Ft Ir ◽

Tertiary Amino

In this work, surface modification of silk fibroin was conducted by grafting dimethylaminoethyl methacrylate (DMAEMA) via ATRP to produce well controlled grafting silk. First, the amino groups and hydroxyl groups on the side chains of the silk fibroin reacted with 2-bromoisobutyryl bromide (BriB-Br) to obtain efficient initiator for ATRP. Subsequently, the functional silk fibroin was used as macroinitiator of DMAEMA in 1,2-dichlorobenzene in conjunction with CuBr/N,N,N',N",N" -pentamethyldiethylenetriamine (PMDETA) as a catalyst system. FT-IR characterization of the modified silk substrate showed a peak corresponding to DMAEMA indicating that the polymer had been formed on the silk surface. Following the polymerization, the tertiary amino groups on the grafted silk fibroin were quaternized to produce a large concentration of quaternary ammonium groups, which endowed the silk substrate with potential antibacterial surface. The graft chains were cleaved by acid hydrolysis and analyzed by gel permeation chromatography (GPC). The GPC results indicated that the graft layer were well-controlled.

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Synthesis and Characterization of Novel Hybrid Ladderlike Polysilsesquioxanes Containing Polypropylene Moieties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.845.204 ◽

2013 ◽

Vol 845 ◽

pp. 204-208

Author(s):

Deock Sam Park ◽

Tae Sung Ha ◽

Jung Hyurk Lim ◽

Kyung Min Kim

Keyword(s):

Melting Temperature ◽

Hybrid Materials ◽

Char Yield ◽

Synthesis And Characterization ◽

Hydroxyl Groups ◽

Organic Polymers ◽

Interesting Candidate ◽

Ft Ir

Novel ladderlike polysilsesquioxanes containing polypropylene moieties (LPS-PP) were synthesized from LPS having chloromethylphenyl groups (LPS) and polypropylene having hydroxyl groups (PP-OH). LPS-PP was characterized by FT-IR, DSC, SEM, EDX, and TGA. The obtained LPS-PP shows no melting temperature due to the disappearance of melting temperature of PP, indicating the rigidity of Si-O-Si backbone in ladderlike LPS. The char yield of LPS-PP is higher than that of PP-OH because of the silica parts of LPS. This new LPS-PP can be an interesting candidate to fabricate hybrid materials using interactions or compatibility between PP moieties of LPS and various organic polymers.

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Study on Synthesis, Characterization and Ultrasonic Degradation the Dyeing Wastewater of 11- MnZrMo Heteropoly Salt with Keggin Structure

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.1484 ◽

2012 ◽

Vol 476-478 ◽

pp. 1484-1487

Author(s):

Zhi Hong Zhang ◽

Feng Xue

Keyword(s):

Basic Feature ◽

Keggin Structure ◽

Molar Ratio ◽

Dyeing Wastewater ◽

Element Analysis ◽

Good Thermal Stability ◽

Ft Ir ◽

Ultrasonic Degradation ◽

The Fourier Transform

The heteropoly salt, Na6[Mn(Mo11ZrO39)] •19H2O（MnZrMo）with Keggin structure of the 1:1:11series, was synthesized by the aqueous solution method, and characterized and analyzed. The element analysis showed that the molar ratio of Mn, Zr and Mo was accord with 1:1:11;the thermogravimetric analysis/ differential thermal analysis(TG/DTA) indicated that the MnZrMo had good thermal stability and it contained nineteen molecules of crystallization water; the characterization of the fourier transform infrared spectroscopy(FT-IR),X-ray powder diffraction analysis(XRD) and the ultraviolet spectrum(UV) showed that the anionic of the MnZrMo heteropoly salt possessed Keggin structure; the analysis of the scanning electron microscopy(SEM) showed that it had the basic feature of the macromolecular compound and a regular crystal. The MnZrMo heteropoly salt was used as the catalyst to degrade the acidic-green B(AGB) dyeing wastewater enhanced by the ultrasonic, the degradation rate could reach 95.90%.

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Characterization of Andean Blueberry in Bioactive Compounds, Evaluation of Biological Properties and in vitro Bioaccessibility

10.20944/preprints202009.0055.v1 ◽

2020 ◽

Author(s):

Nieves Baenas ◽

Jenny Ruales ◽

Diego A. Moreno ◽

Daniel Alejandro Barrio ◽

Carla M. Stinco ◽

...

Keyword(s):

Antioxidant Capacity ◽

Bioactive Compounds ◽

Biological Activities ◽

In Vitro Digestion ◽

Biological Properties ◽

Wide Range ◽

Zebrafish Embryogenesis

Andean blueberries are wild berries grown and consumed in Ecuador which contain high values of bioactive compounds, mainly anthocyanins, with powerful antioxidant activity. The aim of this study was to evaluate the profile and contents of (poly)phenols and carotenoids in Andean blueberry by HPLC-DAD-MSn and determine a wide range of its biological activities. The antioxidant capacity of this fruit was evaluated in vitro by three different methods and in vivo using the zebrafish animal model, also the toxicity effect was determined by the zebrafish embryogenesis test. Besides, the antimicrobial activity and the capacity of Andean blueberry to produce hemagglutination in blood cells were evaluated. Finally, the bioaccessibility of (poly)phenols and related antioxidant capacity were determined in the different phases of an in vitro digestion. The global results indicated no toxicity of Andean blueberry, weakly bacteriostatic activity, and high contents of anthocyanins and antioxidant capacity, which were partially bioaccesible in vitro (~ 50 % at the final intestinal step), contributing to the knowledge of its health benefits for consumers and its potential use in the food and pharmaceutical industry as functional ingredient.

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Synthesis, Characterization and Biological Analysis of Some Novel Complexes of Phenyl Thiourea Derivatives with Copper

Open Chemistry Journal ◽

10.2174/1874842201805010182 ◽

2018 ◽

Vol 5 (1) ◽

pp. 182-195 ◽

Cited By ~ 3

Author(s):

Neha Mathur ◽

Nisha Jain ◽

A.K. Sharma

Keyword(s):

Antifungal Activity ◽

Copper Complexes ◽

Biological Activities ◽

Biological Properties ◽

Biological Processes ◽

The Novel ◽

Electronic Interactions ◽

Thiourea Derivatives ◽

Ft Ir

Introduction: Copper is a very important metal because all forms of life require copper metals an essential micronutrient. Various biological processes, directly or indirectly are dependent on copper metal. Methods: Copper soaps are used as fungicides, bacteriosides, herbicides and insecticides. Copper complexes including heterocyclic compounds have attracted our attention in a magnificent way because of its utility in catalysis and biological functions. Their mechanism of synthesis, characterization and structural insight, are crucial for comprehending the criteria of the bonding and electronic interactions between the proximate metal center and chelating atoms. But still, there is a need to explore some of more biological properties for their wide applicability and significant usage in multiple fields because it is an untapped area with potentially tremendous value. Hence, in this paper, we report the synthesis and characterization of transition metal complex of N/S ligand by chromatographic, FT-IR, NMR, ESR, elemental analysis, conductometric and magnetic moment measurements. Results: The synthesized metal complexes namely copper palmitate with 4-nitrophenylthiourea and copper palmitate with 4-methoxyphenylthiourea were successfully investigated for biological activities against fungi Candida albicans and Trichoderma harzinum. Based on the results, we pronounced biocidal activities of the novel complexes. Conclusion: It is concluded that the activity of nitro phenylthiourea complex has greater antifungal activity than methoxy phenylthiourea complex against these test fungi. We can conclude that the antifungal activity of these complexes varies according to the nature of the groups attached to the ligands.

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