I feel that amino acid analysis in physiological samples is done by cumbersome and time consuming methods in USA. There is a real need for a faster, simpler...
Hello. My name is Juanjo Serrano and I studied Chemistry in Universidad de Valencia (Spain). I created two groups about Chemistry (one in YAHOO! and the other...
Dear Colleagues, Please forgive me for using the list but I believe that some of you will be
interested in this Conference. It will be held this September in...
Zacharenia Loukou
rloukou@...
Apr 8, 2003 8:32 am
1546
Hi Friends, We have a Shimadzu HPLC system working on Class VP software. the system has a Merck Hitachi Lachrom 7200 autosampler. Can any one suggest how to...
I'm running some samples that contain propanol, calcium chloride, and water in addition to volatile organics. After as few as 15 injections I begin to see the...
hi every one i am working on some aromatic plants (essential or volatile oils) after gc/ms AND bioassay, known 1)the components of these essential oils, 2) and...
Dear colleagues - This e-mail is similar to one posted in 2000 regarding peptide adsorption to polypropylene vial walls. I am having a similar problem with...
Hello everyone, We have a Saturn 2000 GC/MS and during the last 6 months the life of our filaments is continuously decreasing to less than 1 month. This fact...
Ricardo
riclopez@...
Apr 14, 2003 6:45 am
1551
Dear Sirs We are trying buying a Spectrophotometer. If you know some best companies which produce the high quality instruments in this area, please tell us. ...
I am looking for some one that has got experience with Method IP391/95 Petroleum Products- Determination of aromatic hydrocarbon types in middle distillates -...
Groenewald, Conrad (CW)
conrad.groenewald@...
Apr 14, 2003 12:23 pm
1553
Hi Conrad
I've some occasional experience in IP391 and in addition I carry out a similar analysis (in fact the one that IP391 was based on) on 2 other...
Afshin I worked with the Agilent and Varian equipments, and in my opinion, the Varian (Cary 50) is the best. Best regards Rodrigo ... De: Afshin Hakimnia...
If anyone out there has recently purchased new Finnigan GC-MS instruments, I'd like to hear about your experience with it. I've heard claims of increased...
Hi everyone, I have a recurring problem. I am running the USP method for Lidocaine HCl. The USP reference standard is for plain Lidocaine. My raw material I am...
I am looking for companies, preferably in the United States, that can do non-aqueous reversed phase on the process scale. I have a separation scheme for a...
Does anyone out there have a good explanation yet on why HP GC-MS systems experience a loss of response on later eluting compounds when it has nothing to "chew...
Hello. My name is Juanjo Serrano and I studied Chemistry in Universidad de Valencia (Spain). I created two groups about Chemistry (one in YAHOO! and the other...
Hi Does anyone know what the Mark-Houwink constants for poly caprolactone are, in chlorofom at 30ºC (or any other temperature). Any help would be greatly...
Dear all, Because of the specific nature of my project, I have to use MTBE (methyl tertiary-butyl ether) or ethyl acetate as the mobile phase, which...
Dear all, Commonly, people use ACN to precipitate proteins out of plasma sample and then inject the supernatant to LC-MS/MS. This procedure is called...
I'm looking for somewhere to buy or repair the filament for my PerkinElmer QMass 910. PerkinElmer no longer carries the replacement part so I'm looking for...
hello I am presently involved in the seperation process.My basic aim is to seperate lactic acid. I need some basic concepts as to which seperation is best like...
Hello, I will be running some assays for sunscreen active ingredients. On the side, is there any way to predict if any of the inactive ingredients in the...
Hi, We are developing an SPE/HPLC method for PAH's down to 0.02ppb levels in water. We are using a reveresed phase SPE cartridge and HPLC with fluorescence...
Hello, I am going towork on a NCD255 and I would like to know exactly how it works, the difference with thermal energy analyser (TEA) and the main publications...
That would depend on several questions: 1. what is your formulation? 2. are you using reversed phase? 3. what type of sample preparation are you performing? 4....
shiffty@...
May 8, 2003 1:15 am
1571
Hi, What type of cartridge are you using? If you are using a plastic cartridge I would replace it with a glass cartridge. Have you tried pre-rinsing the SPE...
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