internal standard


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internal standard

[in′tərn·əl ′stan·dərd]
(spectroscopy)
The principal line in spectrum analysis by the logarithmic sector method, a quantitative spectroscopy procedure.
References in periodicals archive ?
Biological fluids (200 uL) were mixed with internal standard (100 uL = 100 ng) in eppendorf tube, acetonitrile (600 uL) was added and vortexed for 3 min.
Figure 2, 3 and 4 show chromatogram of SAPHYR (France) rotenoids cube resin and sample solution using an internal standard (IS) solution of curcumin.
1] peak height) with that of the internal standard (1715, 1608, and 1582 [cm.
Analysis yields peak areas for the unlabeled analyte and the labeled internal standard that are exactly equivalent.
100ml of the internal standard (containing the following labeled acylcarnitines in 100[micro]l methanol: [[d.
As the samples comprised different matrices, an Internal Standard was employed to act as a dynamic correction for suppression/enhancement of signals owing to viscosity, matrix or sample transport differences.
This combination of internal standards were chosen because (a) SRM 676 is the 'standard' internal standard and is being certified for crystallinity, (b) the rutile internal standards have an absorption coefficient between that of the highest (magnetite) and lowest (quartz) absorbing materials in the samples and (c) different particle sizes may yield information of particle size effects on microabsorption.
2000) reported that cochopping with an internal standard appears to compensate for the presence of FIs.
In this study, liquid semen sample dilutions were identified as being near the 4ng PSA/ml internal standard value.
For many materials there is a need for an internal standard that has a mass close to the material of interest but does not either charge preferentially or suppress the charging of the material of interest.
Internal standard operating procedures may need to be revised and training scheduled for tax personnel and other employees, to ensure understanding and compliance.

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