Matrix Assisted Laser Desorption (MALDI) is a soft ionization technique used in modern day chemistry to analyze polymers with high precision and speed. This does not require any polymer standard for mass calibration (as the case of gel – permeation chromatography GPC). Protocols only minimum amounts solvent consumables. Measurements masses individual oligomers facilitate determination monomers ...

An α-glucosidase inhibitor was developed from Aspergillus oryzae N159-1, which was screened from traditional fermented Korean foods. The intracellular concentration of the inhibitor reached its highest level when the fungus was cultured in tryptic soy broth medium at 27℃ for five days. The inhibitor was purified using a series of purification steps involving ultrafiltration, Sephadex G-25 gel p...

To predict the polymer properties produced by free-radical polymerization of N-vinylpyrrolidone (NVP) in aqueous solution a detailed kinetic model has been developed. The allows to calculate chain length distribution, number branching points, and terminal double bonds (TDB). latter is accounted for since TDBs are precondition branching. While monomer conversion can be predicted sufficiently usi...

Abstract The paper presents the results of research on influence used plasticizing system structural and thermal properties thermoplastic starch (TPS). granulate was obtained by extrusion native in presence a using twin-screw extruder. Glycerol urea were as plasticizers various proportions. In order to evaluate effectiveness plasticization process, changes its chemical structure analyzed infrar...

Willow (Salicaceae) bark contains a variety of antioxidant phytochemicals depending mainly on the hybrid. In this study, hot water extraction willow was coupled with sequential preparative scale chromatography to purify crude extracts well-separated and highly concentrated phytochemical fraction. The pre-equilibrated hydrophilic weak cation exchange resins (with acrylic matrix in Na+ ions form)...

BACKGROUND & OBJECTIVES Several host defense proteins known to possess antimicrobial activities are present on mucosal surfaces and are consequently found in body fluids of vertebrates. Naturally occurring protease inhibitors like cystatins, especially cystatin C (cys C), are abundantly present in human seminal plasma. Although its antiviral activity against herpes simplex virus (HSV) has been ...

INTRODUCTION The term Gel Chromatography refers to the process of separation of solutes caused by the passage of a solution through a column filled with a porous gel. The dissolved particles may enter the pores fully or partially or they may remain completely excluded. This results in a sorting out of the dissolved particles according to their size, so that the largest particles migrate with th...

Methacrylate-benzodioxinone (BDMA) as a monomer was firstly synthesized and then copolymerized with methyl methacrylate 2-hydroxyethyl via atom transfer radical polymerization (ATRP) in the presence of CuCl/pentamethyldiethylene triamine (PMDETA) catalytic system using ethyl 2-bromopropionate (EtBrP) an initiator. Successful formation block copolymer also confirmed detail by proton nuclear magn...

Lectins are a glycoprotein that plays significant role in plant and fungi resistance mechanism against insect microorganism attacks. This paper describes for the first time extraction purification of lectin protein found tubers Truffle (Terfezia sp.) by series steps. Initially, precipitated ammonium sulfate accompanied chromatographic techniques include ion-exchange chromatography gel permeatio...