Jeremy Polreis

9 Questions 17 Answers 0 Followers

Questions related from Jeremy Polreis

Should you grease Volumetric Flasks?

We are having a bit of a debate on weather or not the glass stoppers for our volumetric flasks should be greased. We find sometimes the stoppers on our larger flasks to be dry-locked sometimes...

11 April 2023 8,033 2 View

Is there a good sealing mat for a 96 well plate system that can withstand being heated to 100C?

We are utilizing an aluminum 96well plate system with glass vials due to organic we are utilizing. We need to heat the system to 100C and not let any organics escape. We are having issues with...

10 January 2023 2,934 1 View

What is this pad at bottom of the aluminum 96 well base Plate ?

We obtained these aluminum 96 well plate systems and are having a hard time finding this red pad that sits on the bottom of the baseplate. Would anyone know who makes or carries this red pad? Or...

01 November 2022 8,613 1 View

What are the noncovalent Interactions of Primuline with Lipids?

We are running some TLC plates to separate lipid components and are utilizing a primuline solutions to stain the plates at the end so the lipids light up under UV. A question was brought up about...

30 July 2021 2,182 3 View

Help with Double Peaks in LC/MS/MS?

Hello all, We are obtaining some weird LC/MS/MS peaks. We are using a Shimadzu-8050 LC/MS/MS system and are running 0.1% Formic in MeOH and 0.1% Formic in Water for our mobile phase. We are...

11 April 2020 745 0 View

Help with Ricinoleic Acid analysis?

We are currently trying to venture into trying to analyze Ricinoleic Acid which is a hydroxy fatty acid. We routinely analyze PUFA/SAT fatty acids. We are having a little trouble with developing...

19 June 2019 5,273 7 View

Using GC-FID we are getting significant shift in retention times after 40 samples. What could be causing this issue?

We are using Shimadzu GC2010 and GC2010 Plus GC-FID with Supelco SP-2560 Capillary column. Lately we we have been running batches of between 30 and 100 we have noticed a significant shift in...

24 April 2017 9,770 15 View

Can not figure out where the junk in Trans Linoleic Acid is coming from in our gas chromatogram. We're following the BF3 FAME analysis method. Ideas?

Our BF3 lot changed and we are getting junk in our Trans Linoleic Acid peaks and we can not figure out what is causing the junk to occur. Analyzed the peak on GCMS and could not make heads or...

06 June 2016 1,130 11 View

Measure Folate and Ferritin in RBC on Clinical Autoanalyzer?

I am looking at being able to measure Folate and Ferritin from RBC on a Clinical Chemistry Autoanalyzer. We currently have a Horiba Pentra C400 to try this on. So far I have only found assay...

01 January 1970 1,536 2 View