Forough Karami

11 Questions 6 Answers 0 Followers

Questions related from Forough Karami

If Purospher STAR RP-18 LiChroCART (HPLC column) is suitable for amino acids?

Hi Dear Researchers, Could anyone please provide me with some information about the HPLC column, specifically the “Purospher STAR RP-18 LiChroCART Cartridge”? I would like to know if it is...

26 June 2024 9,567 1 View

What is the reason of negative response in 3D plots of Central Composite Design?

I used Central Composite Design to optimize effective factors for a typical determination. Now, as shown in attached Figure, in 3D response surface plots, response (peak area) is started from...

02 April 2022 8,706 0 View

What is the best wavelentgh for HPLC determination of Fluconazole?

Based on the UV-VIS spectrophotometry analysis of fluconazole, the maximum wavelengths were acquired at 210 and 260 nm, and the best results were achieved at 260 nm by UV-VIS spectrophotometry....

08 July 2020 363 0 View

What is curtain gas in LC-MS technique?

is collision gas is the same with curtain gas in LC-MS technique? and as a whole what is curtain gas in LC-MS?

23 January 2019 3,305 5 View

What is the meaning of LOD (limit of detection) if it is higher than the lowest point in calibration curve?

I calculated LOD based on this formula: 3 SD of blank/slope and the lowest concentration of calibration curve is 0.1. But theoretical LOD is 0.4 and is higher than 0.1. what is the meaning of...

07 January 2019 8,465 7 View

Does anyone guide me for interpretation of peaks in two dimensional gas chromatography?

How can I interpret chromatograms in two dimensional gas chromatography?

31 May 2017 3,450 3 View

Is it possible to analyze an aqua sample with GC/MS?

I want to know is it possible to inject a sample, that have water to GC/MS?

22 February 2015 9,445 12 View

What is the reason I do not pick any spectrum with my PDA (photodiode array) detector in the HPLC system ?

I do not any pick with phtodiod array.

10 January 2015 8,007 4 View

What are the properties of the samples that can be analyzed by the CHNS/O analyzer?

can I analyse any samples with elemental analyzer?

10 January 2015 5,391 7 View

Why is our calibration curve in some methods polynomial?

The equation is not linear.

26 October 2013 2,571 2 View

Central Composite Design (CCD)

I used Central Composite Design to optimize effective factors for a typical determination. Now, as shown in the attached Figure, in 3D response surface plots, response (peak area) is started from...

01 January 1970 2,190 0 View