What is the difference between Carotenoids and carotenes?

More Fuad Al-Rimawi's questions See All

I see a clump on my Inserts(Transwell assay), what is it?

Hello, I am working on a Transwell assay, and I have been trying to optimize the assay for a long time, currently, I am working on hCMEC/D3, seeded at 2x10^4 and left for 5 days (the experiment...

11 December 2019 9,198 3 View

Can we use Milliq water for LC/MS?

Milliq water is used for HPLC with UV detection , but can it be used for LC/MS.

06 January 2018 2,694 12 View

Is it possible to analyze colistin sulfate in a pharmaceutical drug by HPLC with UV detection?

Colistin has weak chromopheres, therefore it is usually analyzed by microbilolgy methods and not by HPLC. is it possible to analyze it by HPLC with PDA detector.

31 December 2017 849 0 View

Why PDA detectors can not withstand colored mobile phases in HPLC analysis?

In an HPLC method of analysis, Copper (II) sulfate is used in the mobile phase which makes the mobile phase blue. However this affects adversely the PDA detector where its intensity is...

08 September 2017 440 2 View

Do TLC methods for impurities in pharmaceutical analysis have sufficient accuracy, precision?

In some monographs of pharmacopoeias, TLC method is used for analysis/quantification of impurities. Does this method have adequate accuracy, precision, LOD, LOQ for such trace analysis of...

06 July 2017 2,452 0 View

What is the best method to determine 3-aminopropanol in a cream formulation?

3-aminopropanol is a degradation product of panthenol (active ingredient in many creams). it present in low concentrations, so sample of the cream would have a large amount of cream. so what is...

07 May 2017 1,996 2 View

Is there a difference in the retention time of chlorhexidine acetate, and chlorhexidine hydrochloride in HPLC analysis?

In a method of analysis of chlorhexidine hydrochloride by HPLC, chlorhexidine acetate is used in system suitability. should be there a difference in retention time between chlorhexidine...

03 April 2017 1,577 5 View

How to separate and analyze simultaneously valproic acid and sodium valproate by HPLC?

Valproic acid and sodium valproate when dissolved in the mobile phase and injected into HPLC, they coelute and can not be separated as they become identical in solution. Is there a method for...

02 March 2017 3,969 5 View

What is the maximum concentration of sodium-1decanesulfonate ion pairing regent in reversed phase mobile phase?

In an analysis of impurity in pharmaceutical drug, sodium-1decanesulfonate is used as ion pairing agent at a concentration of 1 g per liter which is higher than the solubility of it in water. Is...

02 March 2017 3,450 3 View

What is the function of tetrabutylammonium hydroxide in the separation of isomers of an analyte?

In analysis of cefixime isomer, tetrabutylammonium hydroxide is used in the mobile phase at a concentration of 2.5%. why is it used? can we use tetramethylammonium hydroxide instead of it.?

02 March 2017 4,272 5 View

How to heat polymer for about 130° without oil bath ?

is there any other way to heat a polymer evenly other than oil bath if so what are those and how to use it

06 August 2024 947 1 View

If we are using snowball sampling technique, how do we justify the true representativeness of the sample statistically? is there any statistical test?

Are there any statistical methods to justify your sampling technique using SPSS or AMOS?

05 August 2024 9,153 4 View

What are possible strategies can be used to analyze data under sequential explanatory mixed method approach?

Better ways to analyze the qualitative and quantitative data in a sequential explanatory mixed method approaches

04 August 2024 2,703 6 View

Do you think can be any gas and oil bearing rocks in Eastern part of Iran?

I want to know more about petroleum deposits in Iran.

02 August 2024 8,725 3 View

Why 3 replicates for most biological assays? Is it enough to examine the data fits normal distribution?

Just bounced on me. Before statistically analysing significant difference, shouldn't we see if data fits normal distribution first? Is 3 replicates enough to testify the hypothesis of normal...

31 July 2024 8,141 13 View

Request for Advice: Starch Metabolism Research Project?

I am currently considering a research project focusing on a comparative analysis of starch metabolism in orchids and roses. I am particularly interested in identifying the types and quantities of...

30 July 2024 4,267 2 View

Can the limit of quantification (LOQ) of an analytical method fall outside its linear dynamic range, or must it always be within it?

Can an analytical method's limit of quantification (LOQ) be outside its linear dynamic range, or is it always required to be within it? Please provide a thorough explanation supported by verified...

29 July 2024 7,198 9 View

Pragmatic inquiry research design?

Employing a pragmatic inquiry research design, looking for published research using this method, employing qualitative research data collection methods of semi-structured interview and focus...

28 July 2024 540 2 View

Can i apply a public questionnaire but analyse it with a different data analysis method?

First, thanks for taking the time to read my puzzle 🥹! I am currently working on the methodology part of my dissertation, and I have chosen a questionnaire as the instrument for my quantitative...

27 July 2024 3,457 3 View

Heavy Crude oil PVT Data?

Hello i need heavy oil PVT data having viscoisty of 2000-3000 cP. If someone have it or research papers about it, kindly share it with me Thanks

25 July 2024 6,940 1 View