Thanks for everyone's help with my GCMS noise problem. I thought it might be good to post a follow up. After replacing the column, injector heater, liner,...
27th August 2008 Dear colleagues, We are trying to separate the cis/trans isomers of 1,2-dialkylcyclohexanes by HPLC, the aim ultimately being to obtain up to...
Tony Herlt
herlt@...
Aug 27, 2008 12:45 pm
2314
Hi, I'm having some noise issues that I'm hoping someone can help me with. I have a HP5890 GC and HP5970 MS. I recently fixed the injector heater and replaced...
Anyone have simple method for preparation of hydroperoxy linoleic acid (13-HPOD and 9-HPOD) and hydroxy linoleic acid (13-HOD and 9-HOD) with linoleic acid ? ...
11th March 2008 Dear colleagues, Would any of you have information on uS Crestpak C18-S HPLC columns (u represents the Greek letter, mu), specifically,...
Tony_Herlt
herlt@...
Mar 11, 2008 6:40 am
2311
Dear Colleagues, Excuse me to use the forum for this help. I'm needing an old article about glutathione dosage. If somebody can send me I will thank a lot. ...
Hi all, I'm hoping someone could help me. We have started some experiments with PCBs. We extracted control and PCB spiked sediment samples by soxhlet...
Dear colleagues, can somebody send me the article below? Ng HT, Chen CY, Hsieh HM, Leung WY, Ou MC, Tang WL. Amniotic fluid lecithin/sphingomyelin ratio in...
4th December 2007 Dear colleagues, Would any of you know of a commercial source for an HPLC column packed with basic alumina (pH >= 9), particle size 10 micron...
Tony_Herlt
herlt@...
Dec 3, 2007 11:45 pm
2307
Did someone have experience for quantifying low concentration of lactic acid in rumen juice (10 µg/ml)with HPLC/UV or GC/FID system ? Thanks....
Dear Colleagues, Can someone send me this article, Lechner M, Rieder J. Mass spectrometric profiling of low-molecular-weight volatile compounds--diagnostic...
Ion-pairing reagents such as tetra-butyl-ammonium chloride and octanesulfonic acid tend to adsorb to reversed phase stationary phases like C-18, modifying ...
Why a C18 Column with a mobile phase with ion pairing conditions on more time than a C18 with a mobile phase without ion pairing? thank you Gianfranco ...
Problem: We are consistently seeing peak(s) around 14-18 amu over 40 abundance in the autotune spectra on an Agilent 5973 MSD connected to an Agilent 6890 GC....
3rd May 2007 There is chromatography data system software called Delta 5.5 that would probably work well with your GC instruments and is competitively priced. ...
Tony_Herlt
herlt@...
May 2, 2007 11:29 pm
2300
We have a HP5890 GC-FID and a Varian 3400 GC-ECD. Both currently have integrators. I'd like to replace both integrators with one computer. We never use both...
Dear Friends Could you anyone suggest us for doing Chef test and swap test in water,meat and fish. Charm sciences inc is making such instrument. If you know...
I need the components of a simple method to determine Vitamine 25 OH D3 in HPLC.The method is as follow: Sample preparation Mix briefly 500 µl serum/plasma...
26th February 2006 Dear colleagues, I am trying to obtain the following article: Title: Analysis of peptides at low levels using a chromatography system...
Tony_Herlt
herlt@...
Feb 25, 2007 10:18 pm
2295
Hi, Is the system conected to an integrator or to a chromatography station? In either case I would first check to see if the cables are connected tightly. Do...
the shifflet's
shiffty@...
Feb 24, 2007 12:44 pm
2294
I'm running some HPLC soybeans extracts with ETOH 70% with acetic acid 0,1%, but I got no Genistein peak, although I got a peak at gradient run at 37 minutes...
dear members of the list, i am looking for a training program for mycotoxin analysis by using biosensors. would someone lead me an addres to solve my problem? ...
Senior Analytical Scientist - Torrance, CA I am assisting to recruit a Sr Analytical Scientist for a great company in Torrance, CA. Would you be interested in...
Dear members of the list, i have been appointed to a new laboratory and i am expected to learn how to detect mycotoxins in food and feed materials. firstly i...
Manager, Process Development - San Diego, CA A client of ours in San Diego, CA is seeking a Manager, Process Development. They are a specialty biotechnology...
Hello, I'm working on an HPLC, Hewlett Packard 1050. I'm not being able to detect any peak, even though I can see that the detector is reading an absorbance...
Senior Scientist/Group Leader - Analytical Development A great company in Tarrytown, NY is seeking a Senior Scientist/Group Leader-Analytical Development....
Dear members of this list, I would appreciate if anyone help me in order to get two articles which is very helpfull for me in order to improve my work with ...
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