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  • mixtures
  • Gradient elution of polystyrene standards on reversed phase C18 columns by methanol/tetrahydrofuran or methanol/dichloromethane mixtures yielded a strange effect of the molecular weight of the sample on the specific peak are (mAUs per μg sample injected). (springer.com)
  • Column
  • Hydrophobic molecules can be eluted from the column by decreasing the polarity of the mobile phase using an organic (non-polar) solvent, which reduces hydrophobic interactions. (wikipedia.org)
  • These tests did not provide any information related to the durability of the column when working with acidic or basic conditions-that is, phase aging. (chromatographyonline.com)
  • the ranking is only relevant from a reference column, meaning that no simultaneous comparison of all stationary phases can be done. (chromatographyonline.com)
  • For instance, a C18 reversed-phase chromatography column may be followed by a phenyl column. (wikipedia.org)
  • The two liquid phases come in contact with each other as at least one phase is pumped through a column, a hollow tube or a series of chambers connected with channels, which contains both phases. (wikipedia.org)
  • Some types of countercurrent chromatography, such as dual flow CCC, feature a true countercurrent process where the two immiscible phases flow past each other and exit at opposite ends of the column. (wikipedia.org)
  • One or more pumps deliver the phases to the column which is the CCC instrument itself. (wikipedia.org)
  • An example of the ion-exchange chromatography is given by the NTRC using sulfonated polystyrene as a matrix, adding the amino acids in acid solution and passing a buffer of steadily increasing pH through the column. (wikipedia.org)
  • employ
  • The original problem that Martin and Synge encountered with devising an instrument that would employ two free-flowing liquid phases was solved by Lyman C. Craig in 1994 and commercial counter-current distribution instruments were used for many important discoveries. (wikipedia.org)
  • methanol
  • Despite the relatively high viscosity of EAA, plate count values averaged only about 15% less for EAA as compared to methanol using the same mobile phase composition and could be raised by either working at a temperature above ambient or reducing the flow rate. (springer.com)
  • conditions
  • To investigate how the matrix effects in ESI/MS differ for human plasma samples between SFC and reversed-phase LC, using generic screening conditions for both techniques, and a set of typical low molecular weight drug substances. (diva-portal.org)
  • liquid
  • Solvent assisted inlet ionization can be coupled not only to liquid chromatography (LC) but also to nano LC. (wikipedia.org)
  • The partition coefficient, abbreviated P, is defined as a particular ratio of the concentrations of a solute between the two solvents (a biphase of liquid phases), specifically for un-ionized solutes, and the logarithm of the ratio is thus log P. When one of the solvents is water and the other is a non-polar solvent, then the log P value is a measure of lipophilicity or hydrophobicity. (wikipedia.org)
  • Non liquid phases can also be used with partitioning methods such as micellar phases and vapor phases. (wikipedia.org)
  • test
  • Phenylpiracetam demonstrates antiamnestic activity by restoring performance in the passive avoidance test and partially reversing each of these scopolamine-induced receptor density changes. (wikipedia.org)
  • however, the trial did not adequately test the ability of Juven to prevent or reverse the loss of lean body mass in individuals with cancer cachexia since the majority of participants did not complete the study. (wikipedia.org)
  • weight loss
  • Whey protein is also used to reverse weight loss in people with HIV and to help prevent allergic conditions in infants. (webmd.com)
  • partition
  • Partition coefficients can also be defined when one of the phases is solid, for instance, when one phase is a molten metal and the second is a solid metal, or when both phases are solids. (wikipedia.org)