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what is the difference between gc& hplc. why we r not
calculating purity by gc for final products
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Answer / dhanalakshmi
Gas chromatography (GC) is based on a partition equilibrium
of analyte between a solid stationary phase (often a liquid
silicone-based material) and a mobile gas (most often Helium).
In the HPLC technique, the sample is forced through a column
that is packed with a stationary phase composed of
irregularly or spherically shaped particles, a porous
monolithic layer, or a porous membrane by a liquid (mobile
phase) at high pressure
GC is used for volatile compounds (those that break down
rapidly) while HPLC is better for less volatile samples. If
a sample contains salts or carries a charge, it must be
analyzed using HPLC, not GC
GC is used for volatile compounds (those that break down
rapidly) while HPLC is better for less volatile samples. If
a sample contains salts or carries a charge, it must be
analyzed using HPLC, not GC
| Is This Answer Correct ? | 25 Yes | 3 No |
Answer / d.lodhiya
In GC mobile phase is Gas and in HPLC is liquid.
due to its resolution power.
| Is This Answer Correct ? | 8 Yes | 6 No |
Answer / nidhi srivastava
In the majority of the cases the analytical method of
choices is either GC or HPLC. GC generally selected where
the compounds to be analysed are volatile, of low molecular
weight, thermally stable and non polar.In HPLC methods
developed for analytical work with picograms, nanograms of
compounds are simply transferred to larger columns to higher
flow rates for preparative chromatography for the isolation
of milligrams or grams of compounds. Similar scale
preparative GC would be impractical, if not impossible, in
the laboratory.
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / nirav
GC is used for volatile compounds & HPLC is used for
non-volatile compounds. And because of in your product may
be non-volatile impurities.So, not calculating purity by gc
for final products.
| Is This Answer Correct ? | 0 Yes | 2 No |
Which column is more polar, C8 or C18?
6 Answers Cipla, Glenmark, Laurus, Torrent Power,
which lights using during force degradation?
In HPLC when we use Isocratic method, Gradient method in hplc?
What is mean by PDR?
In HPLC Chromatographic separation Resolution equation is Rs = 1.18 (tR2 –tR1)/wh1+Wh2, Where, tR2 and tR1 is run time of eluent ratios of the distances from the point of application to the centers of the spots and the distance travelled by the solvent front from the point of application (retardation factor), and Wh1and Wh2 , is peak width of at half height. What is 1.18 ?
In Karl fischer titrator what medium we can choose to analysing aldehyde and ketone samples by using KF reagent
difference between precision & accuracy.
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3 Answers Cipla, Dr Reddys, FDC,
if your product is soluble in 0.1n hcl and water then which you choose as media from these 2 media?
What is Signal to noise ratio?
why SGF media used for dissolution . What is the use of it .can we use other media of lower pH instead ot this?
which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc
Organic Chemistry 
