Earlier column chromatography was used for preparative purposes as well reaction control in organic synthesis. Column is an extremely tedious stage any laboratory and can quickly become a point of congestion process lab. Flash technique developed modification chromatography. This air pressure driven comprising medium short chromatography, optimised rapid separation compounds. Modern flash chrom...

iranian castor bean lectin was isolated and purified by several column chromatography methods. then, the sugar and amino acid content of the purified lectin was identified. castor bean lectin has some anti tumor and anti leukemia action. thus it may be used commercially for medical and biochemical purposes.

synthesis of zinc dialkyldithiophosphate (zddp) consists of two stages. in the first stage, phosphorus pentasulfide reacts with an alcohol to give dialkyldithiophosphoric acid. in the second stage, the acid is neutralized by zinc oxide. in addition  to the product, some impurities are also formed which affect the quality of the final product. if we can determine the chemical structure of these ...

alumina-supported cs3[re(c2o4)3] precursor has been synthesized  for preparation of re-cs/g-al2o3 catalyst. cs3[re(c2o4)3]  has been prepared from the reaction of recl3 with  h2c2o4.2h2o and cscl in water. the complex has been characterized by elemental analysis and various spectroscopy techniques such as ft-ir, uv-vis and 13c-nmr. the complex was supported on γ-al2o3 by column chromatography. ...

We describe a new method for separating and measuring urinary N-acetyl-beta-D-glucosaminidase isoenzymes by "high-performance" liquid chromatography. Isoenzymes are eluted from the anion-exchange column with a one-step linear gradient of NaCl solution. For continuous post-column quantification of the activities of these isoenzymes, we use an on-line post-column reactor and 4-methylumbelliferyl-...

A gradient elution column chromatography technique and a step-wise technique succeeded in differentiating between IAA and the citrus auxin. IAA was eluted ahead of the citrus auxin in both systems. The highest Avena curvature ever obtained from the citrus auxin occurred after the auxin had passed through the 2 purification techniques and a paper chromatography step. This is probably due to the ...

The review describes on-line derivatization/degradation methods employed in mass spectrometry to solve some structural and analytical problems. Advantages and applications of various positions of reaction systems connected mainly to a mass spectrometer or a gas chromatograph/mass spectrometer are considered. Among these are reaction systems connected directly to the mass spectrometer (reaction ...

background: in this study we have prepared the iga solution from normal human plasma using plasma fractionation and ion exchange chromatography. materials and methods: using fractionation of plasma with cold ethanol (starting with 8% ethanol), fraction iii was prepared as a suitable source for iga preparation. then it was treated with caprylic acid for separation of impurities. for enrichment o...