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pH and glucose dually responsive injectable hydrogel prepared by in situ crosslinking of phenylboronic modified chitosan and oxidized dextran

21-Feb-2015 | Juan Li, Weiqiong Hu, Yajuan Zhang, Hui Tan, Xiaojun Yan, Lingling Zhao, Hongze Liang, Journal of Polymer Science Part A: Polymer Chemistry, 2015

ABSTRACT Injectable hydrogels with pH and glucose triggered drug release capability were synthesized based on biocompatible phenylboronic modified chitosan and oxidized dextran through the formation of covalent imine bond and phenylboronate ester. Rheological characterization demonstrated that ...


Hydrophobic poly(lauryl methacrylate)‐coated magnetic nano‐composite particles for removal of organic pollutants

20-Feb-2015 | Rukhsana Shabnam, Hasan Ahmad, Polymers for Advanced Technologies, 2015

This paper described a simple novel technique to prepare magnetic nano‐composite particles coated with highly crosslinked poly(lauryl methacrylate) (PLMA), a hydrophobic polymer because of its long chain alkyl group for application in waste water purification. Nano‐sized magnetite (Fe3O4) ...


Fluorescent probe for detection of Cu2+ using core‐shell CdTe/ZnS quantum dots

20-Feb-2015 | Wei Bian, Fang Wang, Hao Zhang, Lin Zhang, Li Wang, Shaomin Shuang, Luminescence, 2015

Abstract Core‐shell CdTe/ZnS quantum dots capped with 3‐mercaptopropionic acid (MPA) were successfully synthesized in aqueous medium by hydrothermal synthesis. These quantum dots have advantages compared to traditional quantum dots with limited biological applications, high toxicity and ...


Quick quantification of proteins by MALDI

18-Feb-2015 | Sung Hee Ahn, Jeong Won Kang, Jeong Hee Moon, Kwang Pyo Kim, Seong Hoon Lee, Myung Soo Kim, Journal of Mass Spectrometry, 2015

Previously, we reported that the matrix‐assisted laser desorption ionization spectrum of a peptide became reproducible when an effective temperature was held constant. Using a calibration curve drawn by plotting the peptide‐to‐matrix ion abundance ratio versus the peptide concentration in a ...


Electrospray ionization for determination of non‐polar polyaromatic hydrocarbons and polyaromatic heterocycles in heavy crude oil asphaltenes

18-Feb-2015 | Lilla Molnárné Guricza, Wolfgang Schrader, Journal of Mass Spectrometry, 2015

Electrospray ionization (ESI) is the most common ionization method in atmospheric pressure ionization mass spectrometry because of its easy use and handling and because a diverse range of components can be effectively ionized from high to medium polarity. Usually, ESI is not employed for the ...


γ Irradiation effects on optical, thermal, and mechanical properties of polysulfone/MWCNT nanocomposites in argon atmosphere

18-Feb-2015 | Soumen Kumar Ghosh, Tapan Kumar Chaki, Dipak Khastgir, Richard Pinto, Journal of Applied Polymer Science, 2015

ABSTRACT Polymer‐based composites find use in many nuclear and space application for their ease of fabrication, tailor made properties and light weight. Certain polymers like PTFE, unfilled polyesters and polyamides are prone to degradation in presence of high energy radiation while polymers ...


The effects of pH and surfactants on the absorption and fluorescence properties of ochratoxin A and zearalenone

18-Feb-2015 | Taihua Li, Bo Bae Kim, Tae Hwan Ha, Yong‐Beom Shin, Min‐Gon Kim, Luminescence, 2015

ABSTRACT The pH and surfactant dependencies of the absorption and fluorescence properties of ochratoxin A (OTA) and zearalenone (ZEN), the main mycotoxins found as contaminants in foods and feeds, were evaluated. Three surfactants with different ionic properties were investigated, namely ...


Preparation of Ag/Au bimetallic nanostructures and their application in surface‐enhanced fluorescence

18-Feb-2015 | Jun Dong, Yanyan Ye, Wenhui Zhang, Zebin Ren, Yiping Huo, Hairong Zheng, Luminescence, 2015

Abstract An effective substrate for surface‐enhanced fluorescence, which consists of cluster Ag/Au bimetallic nanostructures on a copper surface, was synthesized via a multi‐stage galvanic replacement reaction of a Ag cluster in a chlorauric acid (HAuCl4) solution at room temperature. The ...


Commercial formaldehyde standard for mass calibration in mass spectrometry

17-Feb-2015 | Jadwiga Lyczko, Daniel G. Beach, Wojciech Gabryelski, Journal of Mass Spectrometry, 2015

Common calibration standards for mass spectrometry can be a source of many problems including instrument contamination, ionization suppression and formation of unidentified ions during subsequent analysis. In this article, we present a new approach for the calibration of mass analyzers such as a ...


The influence of solution parameters on the electrospinning intensity from foamed surface

17-Feb-2015 | Jonas Sidaravicius, Ringaudas Rinkūnas, Tadeus Lozovski, Isto Heiskanen, Kaj Backfolk, Journal of Applied Polymer Science, 2015

ABSTRACT Electrospinning is an efficient process for producing polymeric and hybrid nanofibers. There is, however, a lack of understanding concerning scalability of the process and in particular the production rate optimization. The electrospinning mass transfer intensity depends predominately ...


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