A purification procedure for cyclopiazonic acid has been developed, using sequential preparative and semi-preparative liquid chromatography. Crude cyclopiazonic acid (324 mg) was extracted from a 1 L fermentation medium with chloroform-methanol (80 + 20), dried, dissolved in chloroform, and chromatographed on an oxalic acid/silica preparative column with chloroform-methanol (99 + 1) as the elua...

The study included the extraction and purification of glucose oxidase enzyme from Penicillium chrysogenum, pure by precipitation with ammonium sulfate at a saturation rate 70% specific activity in this step reached (10.802) units/mg fold 1.276, was followed dialysis step, 13,593 48.184. Finally, ion exchange chromatography using DEAE-Cellulose column, 19.355 units/mg, 36.59, after which migrate...

Polysaccharide is widely distributed in natural resources, and currently attracts scientists' attention for their various bio-functions including immunomodulatory activity, hypoglycemic hypolipidemic antitumor promoting effects on gastrointestinal function, so on. The purity structure characteristics of different polysaccharides greatly restrict the in-depth study bioactivity mechanism. Therefo...

Thromboplastin (factor Ill) is a membrane-bound lipoprotein which initiates the extrinsic coagulation pathway when released from a latent state following tissue injury. This activation is brought about by the protein component (apoprotein 111) serving as a receptor for clotting factors VII and X. Apoprotein Ill, as well as the lipid component of thromboplastin, are both necessary for the expres...

Recombinant protein technology provides an invaluable source of proteins for use in structure-function studies, as immunogens, and in the development of therapeutics. Recombinant proteins are typically engineered with "tags" that allow the protein to be purified from crude host cell extracts using affinity based chromatography techniques. Amelogenin is the principal component of the developing ...

CHEMISTRY General methods. All solvents and reagents were purchased from commercial sources and used without further purification. The compounds were spotted on silica TLC plates (Merck, Si 60 , F254), visualized under UV-light at 254 nm or iodine over silica. Purification of the compounds for biological tests was performed on a Waters 2767 system equipped with a photodiode array and an ESI mas...

The specific reaction between SH and iodoacetamide groups has been explored as the basis of an affinity-type purification procedure for peptides synthesized by the solid-phase technique. For this affinity-type purification procedure, we synthesized an SH precursor reagent bearing an acid-labile S-protecting group, pMB-SCH2CONHCH2CH2-SO2CH2CH2OCO2pNP (compound I), in which pMB is p-methoxybenzyl...

Poly(ethylene glycol)-conjugated (or PEGylated) proteins are an increasingly important class of therapeutic proteins that offer improved in vivo circulation half lives over their corresponding native forms. Their production involves covalent attachment of one or more poly(ethylene glycol) molecules to a native protein, followed by purification. Because of the extremely high costs involved in pr...

The first step in biomarkers discovery is to identify the best protocols for their purification and analysis. This issue is critical when considering peripheral blood samples (plasma and serum) that are clinically interesting but meet several methodological problems, mainly complexity and low biomarker concentration. Analysis of small molecules, such as circulating microRNAs, should overcome th...

Immobilized Metal Affinity Chromatography (IMAC) has been used for decades to purify proteins on the basis of amino acid content, especially surface-exposed histidines and "histidine tags" genetically added to recombinant proteins. We and others have extended the use of IMAC to purification of nucleic acids via interactions with the nucleotide bases, especially purines, of single-stranded RNA a...