... by the pressure limitation
of the HPLC equipment. For more information on gradient separation and
developing fast HPLC methods, see Chapter 17 and Practical HPLC Method
Development from Synder ... 0.2- or 0.45-µm-pore-size
filter is generally recommend for removal of particulates [15]. Filtration as a
preventive maintenance tool for HPLC analyses is well-documented in the lit-
er...
... The experiments for
w
w
pH 2–4 were performed on day
1, and those for
w
w
pH 5–7 were performed on day 2 (≈36 hr after initial prepa-
ration).A further investigation was performed by preparing ... height) for peak B ≤ 1.5
•
Tailing factor (5% peak height) for peak A ≤ 1.5
•
Rt for peak A must be 12.0 ± 1.3 min
•
Rt for peak B must be 21 ± 1.0 min
•
The S/N of the LOQ solution (0...
... down the right path for initial mobile-
phase pH selection.
In the following case study for this pharmaceutical compound M, the
method development scenario and rationale for each iteration in ... Figure 8-40A for the
sample stored in the acidic diluent for 4 days at room temperature shows some
degradation compared to Figure 8-40B for the sample stored in the acidic
diluent for...
... the
basic analyte in its fully neutral form.
192 REVERSED-PHASE HPLC
Step 1. First, account for the downward pK
a
shift for the basic analyte upon
addition of organic. For every 10 v/v% increase in acetonitrile, ... Similar parameters have been determined
for this family of compounds for methanol/water mixtures [80]. Using these
parameters for each family of compounds for a pa...
... RP HPLC. We hope that it will be useful for practical chro-
matographers in their efforts to develop efficient and selective separation
methods, and we also hope that it will be encouraging for ...
properties.
For acetonitrile/water systems it was found that acetonitrile forms thick
adsorbed layer on the surface of hydrophobic bonded phase, while methanol
adsorption from water formed a...
... in pharmaceutical
analysis. The precise and accurate control of temperature can improve repro-
ducibility and method transferability (Section 18.2). In recent years, the use of
811
HPLC for Pharmaceutical ... eluent for reversed-
phase high performance liquid chromatography, Anal. Commun. 33 (1996),
327–329.
57. R. M. Smith and R. J. Burgess, Superheated water as an eluent for rev...
...
manufacturing in the pharmaceutical industry. The HPLC (or LC) and MS
(LC-MS) or NMR (LC-NMR) interface increases the capability of solving
901
HPLC for Pharmaceutical Scientists, Edited by ... operation for LC-NMR (Section
20.3.2), with the use of shielded cryomagnets, the location of the MS instru-
ment will follow the same rule as for the HPLC. The most common modes of
ope...