Fatma Elzahraa Mohamed Elessawy

7 Questions 6 Answers 0 Followers

Questions related from Fatma Elzahraa Mohamed Elessawy

Column for USP-561 pesticide LC-MS analysis?

Hello, I am wondering if somebody has experience with trying different columns for pesticide analysis. Pesticides of interest are mainly polar and I would like to hear some opinions about the...

last month 5,991 4 View

Is there anyone familiar with [M-H+114]- adduct in negative mode mass spectrometry?

Hello, I do lots of untargeted LC/MS analysis for structural elucidation of plant extracts. In the negative mode, I found uncommon adduct [M-H+114]- for some deprotonated ions [M-H]-. I have no...

09 October 2024 2,302 5 View

Why would a solution of a pure compound give multiple peaks in LC-MRM method?

Hello, I am developing a method for some derivatized metabolites using 3-NPH (nitrophenylhydrazine). I did the compound optimization for the derivatized compounds individually, but when I started...

02 May 2023 6,719 0 View

Is there any reference mentioned that Faba bean flowers are edible?

Hi, I am looking for any paper mentioned that faba bean flowers are edible. I could not find any. Can anyone guide how to cite this piece of information if I cannot find any publications? I found...

17 April 2020 3,713 0 View

How to calculate DPPH IC50 accurately?

Hello Everyone, I have 20 samples that I measured the antioxidant activity for using DPPH. I calculated the IC50 using Excel by setting up a linear chart of my sample concentration vs %...

05 July 2018 5,500 5 View

If the tested sample interacts with the culture media components, is there any alternative for this media for cytotoxicity or any cell culture assays?

From literature, I found polyphenols are interacting with the cell culture media generating free radicals which makes the interpretation of the results being misleading and confusing. Can anyone...

10 May 2018 6,395 0 View

Should I use the mean of triplicate or incorporate the triplicate results in the statistical test?

Hello Everybody, I measuring the concentration of certain compounds in different genotypes of a plant. I measured the concentration in triplicate using LC-MS. I am confused about using the mean of...

13 February 2018 3,608 3 View