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High-performance liquid chromatography sample contamination

Analytical Supercritical Fluid Extraction and Chromatography Supercritical fluids, especially CO9, are used widely to extrac t a wide variety of solid and hquid matrices to obtain samples for analysis. Benefits compared with conventional Soxhlet extraction include minimization of solvent waste, faster extraction, tunabihty of solvent strength, and simple solvent removal with minimal solvent contamination in the sample. Compared with high-performance liquid chromatography, the number of theoretical stages is higher in... [Pg.2004]

Trace enrichment is a sample precleaning procedure which is performed prior to a sample analysis. The purpose of any sample preparation procedure is twofold. First, such a procedure must selectively collect and concentrate the components of interest. Second, the method should eliminate any other components that would either interfere with the analysis or would contaminate an analytical gas chromatography (GC) or high-performance liquid chromatography (HPLC) column to shorten its useful analytical life. [Pg.1651]

Recently we completed an evaluation of the effectiveness of the Aflatest (Vicam) immunoaffinity column for analysis of corn, peanuts and peanut butter for aflatoxin (11). In this procedure the sample is extracted with Me0H/H20, filtered, and the extract diluted to <30% MeOH with water. An aliquot is then applied to the immunoaffinity column. The column is then washed with water and the aflatoxins eluted with methanol. Total aflatoxins are then determined by solution fluorometry with bromine (SFB), or individual toxins by reverse phase high performance liquid chromatography with post column I2 derivatization (PCD). In the collaborative study corn samples naturally contaminated with aflatoxins and samples of corn, peanuts and peanut butter spiked at 30, 20 and 10 ng/g, were analyzed by 24 collaborators. The results of this study are tabulated in Table V. [Pg.45]

Toyo oka, T., Yamazaki, T., Tanimoto, T., Sato, K., Sato, M., Toyoda, M., Ishibashi, M., Yoshihira, K., and Uchiyama, M., Characterization of contaminants in EMS-associated L-tryptophan samples by high-performance liquid chromatography, Chem. Pharm. Bull., 39, 820, 1991. [Pg.244]

Disposable steel needles used widely in medical practice for drawing of blood samples cannot be used for sampling blood intended for trace metal analysis. Contamination of blood samples by such needles can exceed the actual level of chromium in the sample by a factor of 100-1000. In case liquid chromatography (LC) is used for separation of species, the system inherent contamination has to be taken in account, when using high-performance liquid chromatography (HPLC) equipment (pumps, valves, columns, capillaries) made from stainless steel. [Pg.687]

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High-performance liquid chromatography samples

Liquid samples

Sample chromatography

Sample contamination

Sample liquid chromatography

Sampling chromatography

Sampling contamination

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