Preparation and Characterization of a Novel Mixed Functional Cationic Exchange Copolymer Microsphere as Drug Carrier

The objective of the present study was to prepare a novel mixed functional cationic exchange copolymer microsphere containing methyl methacrylic acid and sulfonated styrene crosslinked with divinylbenzene. The emulsion polymerization was used to prepare the cationic exchange copolymer microsphere which was characterized by the scanning electron micrograph (SEM) and the fourier transform infrared spectroscopy (FTIR). The release characteristic of the loaded drug i.e. dextromethorphan hydrobromide from the copolymer microsphere was studied under both simulated gastric (pH 1.2) and intestinal (pH 6.8) conditions. The result showed that the drug released from the novel copolymer microsphere depended on the pH of the release media.

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Characterization of the Novel Ophthalmic Drug Carrier Sophisen in Two of Its Derivatives: 3A Ofteno™ and Modusik-A Ofteno™

Drug Development and Industrial Pharmacy ◽

10.1081/ddc-200052058 ◽

2005 ◽

Vol 31 (3) ◽

pp. 263-269 ◽

Cited By ~ 1

Author(s):

J. D. Quintana-Hau ◽

E. Cruz-Olmos ◽

M. I. López-Sánchez ◽

V. Sánchez-Castellanos ◽

L. Baiza-Durán ◽

...

Keyword(s):

Drug Carrier ◽

The Novel ◽

Ophthalmic Drug

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Effect of reaction conditions on the thermal stability of polystyrene grafted oil palm empty fruit bunch (OPEFB) fiber

Journal of Polymer Engineering ◽

10.1515/polyeng-2013-0117 ◽

2014 ◽

Vol 34 (2) ◽

pp. 185-191

Author(s):

Jamaluddin Jamarosliza ◽

Mahbub Hasan ◽

Azman Hassan ◽

Nor Azowa Ibrahim ◽

Mansor Ahmad ◽

...

Keyword(s):

Thermal Stability ◽

Oil Palm ◽

Empty Fruit Bunch ◽

Electron Micrograph ◽

Scanning Electron Micrograph ◽

Reaction Conditions ◽

Co Catalyst ◽

The Fourier Transform ◽

Thermal Stability Of ◽

Better Than

Abstract Polystyrene was grafted onto oil palm empty fruit bunch (OPEFB) fiber in aqueous medium by using the H2O2/Fe2+ system as an initiator. Optimization of the reaction conditions was carried out by varying the reaction period, temperature, amounts of the monomer, initiator and co-catalyst. The presence of the peaks around 3026 cm-1, 698 cm-1 and 755 cm-1 in the Fourier transform infrared (FTIR) spectra of the grafted product and the presence of polystyrene on the surface of grafted OPEFB in the scanning electron micrograph provided strong evidence of the grafting. The maximum percentage of grafting (about 200%) was achieved when the reaction was carried on for 4 h at a temperature of 65°C, using 52.27 mmol monomer, 6.00 mmol initiator and 0.26 mmol co-catalyst. The thermal stability of the grafted OPEFB was found to be better than that of the ungrafted fiber, as seen from thermogravimetric analysis (TGA).

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Physicochemical, Spectroscopic and Rheological Characterization of Anacardium occidentale gum Exudates

Advances in Research ◽

10.9734/air/2019/v19i130109 ◽

2019 ◽

pp. 1-15

Author(s):

Nnabuk Okon Eddy ◽

Inemesit Udofia ◽

Edward Okey ◽

Anduang O. Odiongenyi ◽

Patrick Udofia

Keyword(s):

Physicochemical Analysis ◽

Anacardium Occidentale ◽

Rheological Characteristics ◽

Electron Micrograph ◽

Scanning Electron Micrograph ◽

Rheological Characterization ◽

Average Value ◽

Irregular Shapes ◽

Plant Gums

Anacardium occidentale gum exudate was analyzed for physicochemical, spectroscopic and rheological characteristics. Physicochemical analysis revealed that the gum is mildly acidic, ionic, extremely rich in carbohydrate and calcium. GCMS spectrum revealed the presence of some carboxylic acids, ketone and alkanes. The FTIR spectrum of the gum closely resembled those of other polysaccharides. Scanning electron micrograph revealed the presence of pores containing particles with irregular shapes. The average value of intrinsic viscosity of the gum was 3.28 dL/g, which compared favourably with those obtained for some plant gums. From the Huggins, Kraemer and Power law models, it was deduced that there is absence of molecular association and that the conformation of the gum is more rod like. Viscosity of the studied gum was found to be greatly influenced by the presence of urea, K+, Ca2+ and Al2+. Anarcadium occidentale gum exhibited a non-Newtonian property with characteristics dilatant and shears thickening properties.

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Characterization of the Novel Ophthalmic Drug Carrier Sophisen in Two of Its Derivatives: 3A Ofteno™ and Modusik-A Ofteno™

Drug Development and Industrial Pharmacy ◽

10.1081/ddc-52058 ◽

2005 ◽

Vol 31 (3) ◽

pp. 263-269 ◽

Cited By ~ 8

Author(s):

J. D. Quintana-Hau ◽

E. Cruz-Olmos ◽

M. I. López-Sánchez ◽

V. Sánchez-Castellanos ◽

L. Baiza-Durán ◽

...

Keyword(s):

Drug Carrier ◽

The Novel ◽

Ophthalmic Drug

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Characterization of Silica Particles and Concentration Dependent Adsorption Study of Biomolecules

Bangladesh Journal of Scientific and Industrial Research ◽

10.3329/bjsir.v45i4.7377 ◽

1970 ◽

Vol 45 (4) ◽

pp. 363-366

Author(s):

MA Rahman ◽

MAJ Miah ◽

H Ahmad

Keyword(s):

Ph Value ◽

Xrd Analysis ◽

Silica Particles ◽

Adsorption Behavior ◽

Electron Micrograph ◽

Scanning Electron Micrograph ◽

Oh Groups ◽

Adsorption Study ◽

Isoelectric Ph

Submicron-sized silica particles were initially characterized by scanning electron micrograph, FTIR spectroscopy and XRD analysis. The observations revealed that the highly dispersed amorphous silica particles were relatively monodispersed and the particles surface was covered with hydrogen bonded OH groups. Relatively higher magnitude of adsorption of cationic emulsifier and coagulation of silica particles suggested that particles were negatively charged. A comparative study of adsorption behavior of different biomolecules such as trypsin, albumin and lysozyme was also done at the respective isoelectric pH value. The magnitude of adsorption increased with the increase in the amount of immobilization per unit mass of silica particles. Key words: Silica; Amorphous; Adsorption behavior; Emulsifier; Biomolecules DOI: 10.3329/bjsir.v45i4.7377 Bangladesh J. Sci. Ind. Res. 45(4), 363-366, 2010

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Analytical and High-Resolution EM Study of Crystalline Phases formed at Metal-Ceramic Interface

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100135733 ◽

1990 ◽

Vol 48 (2) ◽

pp. 426-427

Author(s):

N. Merk ◽

A. P. Tomsia ◽

G. Thomas

Keyword(s):

Cross Section ◽

Dissimilar Materials ◽

Ceramic Materials ◽

Electron Micrograph ◽

Scanning Electron Micrograph ◽

Structural Applications ◽

Metal Ceramic ◽

The Subject ◽

Ceramic Compounds ◽

Scanning Electron

A recent development of new ceramic materials for structural applications involves the joining of ceramic compounds to metals. Due to the wetting problem, an interlayer material (brazing alloy) is generally used to achieve the bonding. The nature of the interfaces between such dissimilar materials is the subject of intensive studies and is of utmost importance to obtain a controlled microstructure at the discontinuities to satisfy the demanding properties for engineering applications . The brazing alloy is generally ductile and hence, does not readily fracture. It must also wett the ceramic with similar thermal expansion coefficient to avoid large stresses at joints. In the present work we study mullite-molybdenum composites using a brazing alloy for the weldment.A scanning electron micrograph from the cross section of the joining sequence studied here is presented in Fig. 1.

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