Mixing errors

In most cases, the sample titer curves followed the predicted titer standard curve based upon known concentration ratios. Observed variations in linearity were traced back to inconsistencies in labeling rather than cross-reactivity or sample preparation issues such as pipetting or mixing errors. Overall, antigen arrays performed better than antibody arrays. While the exact reasons for the... 

Having obtained a suitable formula for the feed in question, the next step is preparing to mix the feed. The procedures involved in the production of quality feeds are important and should be carried out by trained personnel. Mixing errors are quite common. 

Mixing errors manual mobile phase preparation. These tend to occur as a result of operator error during the dispensing and mixing of the individual components. The final concentration of each component within the mixture can vary depending on the way in which it is prepared. 

Mixing errors automated mobile phase preparation. Problems encountered with an automated system can still be the result of analyst error. For example, the wrong component may have been dispensed into the HPLC solvent reservoir. Where there is an apparent issue in relation to the retention time of a compound, the mobile phase should always be checked for accuracy of preparation. Proportioning valve errors can also cause a problem with automated systems. When the valve ceases to dispense the correct amount of either solvent, the retention time of the compounds of interest will vary. 

Mobile phase proportioning valve mixing error Call engineer... 

To avoid mixing errors in the case of two-pack adhesives, no-mix adhesives are available. In this case, one of the surfaces to be bonded is pretreated with the adhesive resin, the other with the adhesive primer, and the bond is formed instantly when the two surfaces are brought together. 

Paste adhesive. Longer shelf life, no or less changes in storage, accommodates varying bond line thicknesses, but mixing errors are possible, and quality assurance of the adhesive (mix ratio) is generally performed after the strnctnre is bonded. 

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