scholarly journals Physicochemical Characterization of Alginate Beads Containing Sugars and Biopolymers

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Tatiana Aguirre Calvo ◽  
Patricio Santagapita
Keyword(s):  
Water Content ◽  
Digital Image Analysis ◽  
Individual Component ◽  
Physicochemical Characterization ◽  
Alginate Beads ◽  
Complete Characterization ◽  
Ft Ir ◽  
Different Characteristics ◽  
Lower Water Content

Alginate hydrogels are suitable for the encapsulation of a great variety of biomolecules. Several alternatives to the conventional alginate formulation are being studied for a broad range of biotechnological applications; among them the addition of sugars and biopolymers arises as a good and economic strategy. Sugars (trehalose and β-cyclodextrin), a cationic biopolymer (chitosan), an anionic biopolymer (pectin), and neutral gums (Arabic, guar, espina corona, and vinal gums) provided different characteristics to the beads. Here we discuss the influence of beads composition on several physicochemical properties, such as size and shape, analyzed through digital image analysis besides both water content and activity. The results showed that the addition of a second biopolymer, β-CD, or trehalose provoked more compact beads, but the fact that they were compact not necessarily implies a concomitant increase in their circularity. Espina corona beads showed the highest circularity value, being useful for applications which require a controlled and high circularity, assuring quality control. Beads with trehalose showed lower water content than the rest of the system, followed by those containing galactomannans (espina corona, vinal, and guar gums), revealing polymer structure effects. A complete characterization of the beads was performed by FT-IR, assigning the characteristics bands to each individual component.

scholarly journals THE PHYSICOCHEMICAL CHARACTERISTICS OF RECYCLED-PLASTIC PELLETS OBTAINED FROM DISPOSABLE FACE MASK WASTES

2021 ◽  
Vol 23 (1) ◽  
pp. 16
Author(s):  
Vienna Saraswaty ◽  
Rossy Choerun Nissa ◽  
Bonita Firdiana ◽  
Akbar Hanif Dawam Abdullah
Keyword(s):  
Tensile Strength ◽  
Physicochemical Characterization ◽  
Face Mask ◽  
Physicochemical Characteristics ◽  
Scanning Calorimetry ◽  
Elongation At Break ◽  
Ft Ir ◽  
The Government ◽  
Plastic Pellets

THE PHYSICOCHEMICAL CHARACTERISTICS OF RECYCLED-PLASTIC PELLETS OBTAINED FROM DISPOSABLE FACE MASK WASTES. The government policy to wear a face mask during the COVID-19 pandemic has increased disposable face mask wastes. Thus, to reduce such wastes, it is necessary to evaluate the physicochemical characteristics of disposable face masks wastes before the recycling process and the recycled products. In this study, physicochemical characterization of the 3-ply disposable face masks and the recycled plastic pellets after disinfection using 0.5% v/v sodium hypochlorite were evaluated. A set of parameters including the characterization of surface morphology by a scanning electron microscope (SEM), functional groups properties by a fourier transform infra-red spectroscopy (FT-IR), thermal behavior by a differential scanning calorimetry (DSC), tensile strength and elongation at break were evaluated. The surface morphological of each layer 3-ply disposable face mask showed that the layers were composed of non-woven fibers. The FT-IR evaluation revealed that 3-ply disposable face mask was made from a polypropylene. At the same time, the DSC analysis found that the polypropylene was in the form of homopolymer. The SEM analysis showed that the recycled plastic pellets showed a rough and uneven surface. The FT-IR, tensile strength and elongation at break of the recycled plastic pellets showed similarity with a virgin PP type CP442XP and a recycled PP from secondary recycling PP (COPLAST COMPANY). In summary, recycling 3-ply disposable face mask wastes to become plastic pellets is recommended for handling disposable face mask wastes problem.

scholarly journals Physicochemical Characterization Of The Multiuse Medical Textiles In Surgery And As Packaging Material In Medical Sterilization

2017 ◽  
Vol 17 (3) ◽  
pp. 206-212 ◽  
Author(s):  
Beti Rogina-Car ◽  
Sandra Flincec Grgac ◽  
Drago Katovic
Keyword(s):  
Fourier Transform ◽  
Structural Characteristics ◽  
Physicochemical Characterization ◽  
Morphological Characterization ◽  
Packaging Material ◽  
Medical Textiles ◽  
Ft Ir ◽  
Continuous Use ◽  
Electronic Microscope

AbstractThis work investigates changes in the physicochemical properties of dry multiuse medical textiles used in surgery and as packaging material in sterilization after 0, 1, 10, 20, 30, and 50 washing and sterilization cycles in real hospital conditions of the Clinical-Hospital Centre in Zagreb. Scanning electronic microscope (SEM) was used to perform morphological characterization. Physicochemical characterization and the resulting changes in the medical textiles were monitored using Fourier transform infrared (FT-IR) spectrometer. The change in the mass of the medical textiles as a results of temperature was determined by thermogravimetric (TG) analysis. Furthermore, structural characteristics based on the changes that resulted during the washing and sterilization processes are provided. The conclusion of the conducted research on the changes in the properties of multiuse medical textiles (Cotton/PES, Tencel®, and three-layer PES/PU/PES textile laminate) in real hospital conditions is that the medical textiles do manage to preserve properties after continuous use and it is safe to use them up to 50 washing and sterilization cycles.

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.

Preparation and Characterization of Tenofovir Disoproxil-Loaded Enteric Microparticle

2020 ◽  
Vol 20 (9) ◽  
pp. 5796-5799
Author(s):  
Young Hoon Kim ◽  
Yu-Chul Kim ◽  
Jae Yeol Kim ◽  
Jimi Byeon ◽  
Han-Joo Maeng ◽  
...  
Keyword(s):  
Ethyl Cellulose ◽  
Intestinal Tract ◽  
Physicochemical Characterization ◽  
Mixed Structure ◽  
Medium Ph ◽  
Sem Image ◽  
Single Use ◽  
Ft Ir ◽  
Ir Analysis

Tenofovir disoproxil (TD) has narrow absorption site mostly in upper intestinal tract where tenofovir rapidly decomposes. The aim of this work was to prepare and evaluate tenofovir disoproxil-loaded enteric microparticles (TDEMs) for the enhanced duodenal delivery. TDEMs were composed of TD, eudragit L-100 (EL) and ethyl cellulose (EC) as release-controlling polymers. For the physicochemical characterization, TDEMs were evaluated in terms of encapsulation efficiency (EE%), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR). The dissolution test was also performed while continuously changing the medium pH. The EE% of TD in TDEMs was good and more than 90%. The EC and EL formed a physically mixed structure and maintained their respective properties in TDEMs as confirmed by SEM image and FT-IR analysis. Combination of EL and EC gave higher enteric properties to TDEMs than the single use of EL or EC. The optimized TDEM (TD/EL/EC = 0.2/1/1, w/w/w ratio) yielded mean dissolution rate less than 10% in 1 h at pH 1.2, but completed dissolution with a dissolution more than 85% within 1 h at pH 6.5. Thus, the suggested TDEM would be promising enteric microparticles for the intensive delivery of TD to the duodenum.

Synthesis and Physicochemical Characterization of New Polythiophenes Based on Three Different Monomers

2015 ◽  
Vol 1767 ◽  
pp. 57-62 ◽  
Author(s):  
Karla K. Guzmán-Rabadán ◽  
Marco A. Ramírez-Gómez ◽  
Marisol Güizado-Rodríguez ◽  
Jorge A. Guerrero-Álvarez ◽  
Víctor Barba ◽  
...  
Keyword(s):  
Organic Solar Cells ◽  
Electronic Devices ◽  
Physicochemical Characterization ◽  
Oxidation Potential ◽  
High Electron ◽  
High Electron Density ◽  
H Nmr ◽  
Ft Ir ◽  
Functional Membranes

ABSTRACTThe chemical synthesis of the copolymers poly(3-HT-co-EDOT-co-fluorene) and poly(3-HT-co-EDOT-co-TDR1) is reported. The first copolymer is derived of 3-hexylthiophene (3-HT), 3,4-ethylenedioxythiophene (EDOT) and 2,2'- (9,9-dioctyl-9H-fluorene-2,7-diyl) bisthiophene (fluorene). The second copolymer is derived of 3-hexylthiophene (3-HT), 3,4-ethylenedioxythiophene (EDOT) and (E)-2-(ethyl(4-((4-nitrophenyl)diazenyl)phenyl)amino)ethyl 2-(thiophen-3-yl)acetate (TDR1). Their physicochemical characterization by 1H NMR, FT-IR, DSC-TGA, GPC, UV-vis, cyclic voltammetry was carried out. These copolymers combine the high electron density and low oxidation potential of EDOT with the high charge mobility and processability of 3-HT. These are candidates for applications as active or barrier layer in electronic devices (bulk heterojuntion organic solar cells) or as functional membranes (e.g., sensors).

scholarly journals DEVELOPMENT OF AMORPHOUS BINARY AND TERNARY SOLID DISPERSIONS OF NATEGLINIDE FOR IMPROVED SOLUBILITY AND DISSOLUTION

2020 ◽  
pp. 106-112
Author(s):  
SHRADHA S. TIWARI ◽  
SHAILESH J. WADHER ◽  
SURENDRA G. GATTANI
Keyword(s):  
Solid Dispersion ◽  
Water Solubility ◽  
Solid Dispersions ◽  
Physicochemical Characterization ◽  
Dissolution Behavior ◽  
Enhanced Solubility ◽  
Ft Ir ◽  
Ternary Solid Dispersion ◽  
Ternary Solid Dispersions

Objective: Nateglinide is a commonly used oral hypoglycemic, biopharmaceutical classification system Class II drug, which shows relatively poor water solubility and variable bioavailability. The objective of the present investigation was to develop the binary and ternary solid dispersions of nateglinide for improved solubility and dissolution. Methods: Nateglinide solid dispersions were prepared by a common solvent evaporation method. Polymers like soluplus, kolliphor P188, sylloid 244FP, gelucire 48/16, affinisol (HPMCAS), HPβCD, βCD were used in different combinations. The physicochemical characterization of the optimized ternary dispersion was studied by using FT-IR, DSC, and PXRD. Solubility and dissolution behavior of all dispersions were studied. Result: From all prepared ternary solid dispersions, nateglinide dissolution was significantly faster than pure nateglinide. With ternary solid dispersion of NTG, soluplus and kolliphor P188 there was a big improvement in solubility and dissolution. This combination enhanced the solubility of NTG by 23 folds. Another ternary dispersion of NTG with soluplus and gelucire 48/16 enhanced solubility by 25 fold. Conclusion: Ternary solid dispersion found superior over binary dispersions. For the ternary dispersions, showing the best solubility, tablets were prepared. Dissolution and drug release from the formulated tablet was as good as a marketed product.

scholarly journals Physicochemical characterization of C-phycocyanin from Plectonema sp. and elucidation of its bioactive potential through in silico approach

2022 ◽  
Vol 67 (4) ◽  
pp. 68-82
Author(s):  
Arbab Husain ◽  
Alvina Farooqui ◽  
Afreen Khanam ◽  
Shubham Sharma ◽  
Sadaf Mahfooz ◽  
...  
Keyword(s):  
Free Radicals ◽  
In Silico ◽  
Active Sites ◽  
Glycogen Synthase ◽  
Physicochemical Characterization ◽  
Peak Time ◽  
Spectroscopic Techniques ◽  
Ft Ir ◽  
Bioactive Potential

C-phycocyanin (C-PC), the integral blue-green algae (BGA) constituent has been substantially delineated for its biological attributes. Numerous reports have illustrated differential extraction and purification techniques for C-PC, however, there exists paucity in a broadly accepted process of its isolation. In the present study, we reported a highly selective C-PC purification and characterization method from nontoxic, filamentous and non-heterocystous cyanobacterium Plectonema sp. C-PC was extracted by freeze-thawing, desalted and purified using ion-exchange chromatography. The purity of C-PC along with its concentration was found to be 4.12 and 245 µg/ml respectively.  Comparative characterization of standard and purified C-PC was performed using diverse spectroscopic techniques namely Ultra Violet-visible, fluorescence spectroscopy and Fourier transform infrared (FT-IR). Sharp peaks at 620 nm and 350 nm with UV-visible and FT-IR spectroscopy respectively, confirmed amide I bands at around 1638 cm-1 (C=O stretching) whereas circular dichroism (CD) spectra exhibited α-helix content of secondary structure of standard 80.59% and 84.59% of column purified C-PC. SDS-PAGE exhibited two bands of α and β subunits 17 and 19 kDa respectively. HPLC evaluation of purified C-PC also indicated a close resemblance of retention peak time (1.465 min, 1.234 min, 1.097 min and 0.905 min) with standard C-PC having retention peak timing of 1.448 min, 1.233 min and 0.925 min. As a cautious approach, the purified C-PC was further lyophilized to extend its shelf life as compared to its liquid isoform. To evaluate the bioactive potential of the purified C-PC in silico approach was attempted. The molecular docking technique was carried out of C-PC as a ligand-protein with free radicals and α-amylase, α-glucosidase, glycogen synthase kinase-3 and glycogen phosphorylase enzymes as receptors to predict the free radical scavenging (antioxidant) and to target antidiabetic property of C-PC. In both receptors free radicals and enzymes, ligand C-PC plays an important role in establishing interactions within the cavity of active sites. These results established the antioxidant potential of C-PC and also give a clue towards its antidiabetic potential warranting further research.

Preparation and Physicochemical Characterization of Magnetic Composite: CuFe2O4 / Layered Double Hydroxide

2014 ◽  
Vol 955-959 ◽  
pp. 47-50
Author(s):  
Dan Chen ◽  
Xiao Long Ma
Keyword(s):  
Layered Double Hydroxide ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Physicochemical Characterization ◽  
Magnetic Composite ◽  
X Ray Diffraction ◽  
Microwave Hydrothermal ◽  
Ft Ir ◽  
Double Hydroxide

We fabricated new magnetic material CuFe2O4/Zn2Cr-LDH by the combination of CuFe2O4 and layered double hydroxide (LDH) through two steps. CuFe2O4 was prepared by sol-gel method with the assistant of citric acid, which was used in synthesis of the composite via microwave hydrothermal method subsequently. The physicochemical properties of the composite was characterized by several techniques, such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Vibrating sample magnetometer (VSM) and Thermogravimetry-differential thermal analysis (TG-DTA). The magnetic composite reveals several advantage of LDH structure and spinel ferrite oxide and is potential for the application of heterogeneous catalysis.

Thermal and Rheological Study of Nanocomposites, Reinforced with Bi-Phase Ceramic Nanoparticles

2019 ◽  
Vol 233 (9) ◽  
pp. 1233-1246 ◽  
Author(s):  
Noor Saeed Khattak ◽  
Arbab Safeer Ahmad ◽  
Luqman Ali Shah ◽  
Latafat Ara ◽  
Muhammad Farooq ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Loss Modulus ◽  
Sol Gel ◽  
Angular Frequency ◽  
Complete Characterization ◽  
One Pot ◽  
Comparative Performance ◽  
Storage Devices ◽  
Ft Ir

AbstractIn this study the synthesis of bi-phase nanoparticles of Fe1.46Zn0.5La0.04Cu0.5O4(FZLCs) ceramics were first carried out by Sol-gel method and then nanocomposites of FZLCs with polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA), polyethylene glycol (PEG) and polyethylene oxide (PEO) were prepared by one-pot blending technique. XRD, FT-IR, TG/DTA and SEM techniques were applied for complete characterization of composites. Rheological and dielectric properties of all nanocomposites were studied in detail for their comparative performance. TGA results reveal the highly thermal stability for all nanocomposites in this order i.e. FLZCs/PEO > FLZCs/PVA > FZLCs/PVP > FZLCs/PEG. Rheological properties show that these materials are rigid, pseudo plastic and non-Newtonian in nature. The increase in values for storage modulus (G′) and loss modulus (G′′) with increasing angular frequency owed to the shear thinning behavior of these nanocomposites. Dielectric properties show good agreement to that of energy storage substances which means that these materials have potential to be applied in storage devices.

scholarly journals Modifikasi Katalis CaO Untuk Produksi Biodiesel Dari Minyak Bekas

2017 ◽  
Vol 5 (1) ◽  
pp. 47-52
Author(s):  
St. Annisa Gani Rachim ◽  
Indah Raya ◽  
Muhammad Zakir
Keyword(s):  
Fourier Transform ◽  
Water Content ◽  
Waste Cooking Oil ◽  
Acid Number ◽  
Raw Material ◽  
Impregnation Method ◽  
Cooking Oil ◽  
Ft Ir ◽  
Astm D6751

Research about modification of CaO catalyst to produce biodiesel has done. This research aims to know the effectiveness of CaO-ZnCl2 belong to ASTM D6751 to get a yield biodiesel.  Modification of the CaO with ZnCl2 was conducted by impregnation method using methanol and n-hexane. For synthesis biodiesel, methanol is used as solvent and Waste Cooking Oil (WCO) as raw material. Ratio molar of WCO and methanol is 12:1 with 3% CaO-ZnCl2 added.  This reaction is carried out at a temperature of 65oC. the biodiesel is characterized by Fourier Transform Infrared (FT-IR) to determine the presence of ester groups formed. The yield percentage of biodiesel produced is 77.94%. The characterization of biodiesel properties consist of acid number is 73.38 mg KOH/g, density is 0.9038 and water content is 0.0053%.

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