I am searching for information on GC analysis of amino acids in headspace vapors from underivatized (fresh) blood. I was told it couldn't be done yet using an...
Kia Ora, and Happy New Year As a minimum you can assume they will be stable for '40 days' [both US EPA and Standard Methods for the Analysis of Water and...
Kia Ora, and Happy New year Sounds like the FID needs a good clean as the high reading indicates a very noisy flame. After cleaning the detector, balance the...
Hello Yes the problem strat out of the blue. Infact before a month flame tip inside the detector was changed, but we were able to generate more than 20...
Hi, I would take the FID (including the flame jet) apart clean it and make sure that you do not have the colulum too far into the flame jet. Best Wishes, Mike ...
shiffty@...
Jan 6, 2003 10:22 am
1474
I would recomend that you perform a solution stability experiment. You can be surprised by what you learn with these studies. Below is a typical study that...
shiffty@...
Jan 6, 2003 10:22 am
1475
I would add the following: Practicle HPLC Method Development by Snyder, Kirkland, Giajch. It is excellent book for general information. I use it for a...
shiffty@...
Jan 6, 2003 10:22 am
1476
Hello! I'm a senior chemistry major--with an emphasis in biological chemistry--searching for a summer position in the Boston area, as I will be entering a...
Hi All: Does anyone have a manual for an HP(Agilent) 35900 series A/D converter PC card? aTdHvAaNnKcSe Cheers...Al Kind Microchemistry Lab & Proteomics Ctr,...
Al Kind
mchem1@...
Jan 21, 2003 8:55 pm
1478
Dear ALL An Analytical Chemistry Web Directory (WebAnalytes) has been launched since the middle of last December as a private contribution to promote science...
Dear All We have a very old Dionex ion chromatography unit we are trying to resurrect. The pump appear to be malfunctioning, i.e. not pumping. Does anybody...
Dr Jonathan Knowles
j.knowles@...
Jan 24, 2003 11:48 am
1480
Hi(again): I have the HP35900 A/D card working on my Win3.11 Chemstation, but now would like to run the 1090 thru the ChemStation(rev a.03.02). I'm not sure...
Al Kind
mchem1@...
Jan 24, 2003 3:29 pm
1481
Hi: I answered my own question, after a list member suggested looking at AGILENT's WWW site for DOCs. I am sending the following as an "FYI": HPIB addresses...
Al Kind
mchem1@...
Jan 24, 2003 5:28 pm
1482
29th January 2003 Dear colleagues, Happy New Year to you all. I am trying to rebuild an analytical flow cell for a Waters 481 UV/Vis detector. Would anyone...
Tony Herlt
herlt@...
Jan 28, 2003 10:50 pm
1483
We are using Shimadzu make QP2000 GCMS which has a dedicated computer connected with it. The insyrument does not contain any library. Now we want to connect a...
Hello from Tepui's Land! I would like get your opinions and comments about two question: 1) Could CZE to displace to HPLC as primary separation technique? 2)...
Hi, I'm looking for verbascose, galactinol and 1-O-b-D-glucopyranosyl-D-mannitol standards but I don't find them in usual providers catalogs. Is someone know...
Dear Sandrine, Try B Dent Global in New Zealand, http://www.bdg.co.nz . They may be able to provide the standards you seek. They also provide a free search...
Tony Herlt
herlt@...
Feb 1, 2003 6:08 am
1487
Hi, I would recomend the US NIST library that comes on a compact disc. Check out ( http://webbook.nist.gov/chemistry ). You will have to work with your ...
shiffty@...
Feb 4, 2003 4:41 pm
1488
Medicinal Peptide Chemist SciGenium is searching for a Medicinal Peptide Chemist with 3 plus years of industrial experience. Responsibilities: a.. Utilization...
John Rynak
jtrynak@...
Feb 4, 2003 5:13 pm
1489
Hi I'm looking for a method to analize alendronate sodium in tablets. I work with an agilent HPLC 1100 series, binary pump. I already tried a method from the...
Hi. I am interested in any available methods for alendronate as well. Please let me know what you find. Thanks, Karen ... From: alimareli...
Brazzillo, Karen
kmolan@...
Feb 7, 2003 3:26 pm
1491
Never worked with the compound, but did you check USP? They might have the proper conditions. You might also want to carefully check the vendors method, at a...
Diego Zurbriggen
Diego_Zurbriggen@...
Feb 11, 2003 11:24 am
1492
Dear Fellow Chromatographers ! I have a problem with my Chemstation-Software (from Agilent). Every once in a while I get an error message when I try to start...
matthias.kummer@...
Feb 11, 2003 1:08 pm
1493
Biotage Parallex Flex 4-column system Originally purchased June 2001 lists at $160,000 1 to 50mL/Min at 4,000 psig maximum pressure Low pressure binary...
Martin Steel
Martin.Steel@...
Feb 11, 2003 6:33 pm
1494
Hi... I'm doing OTC active ingredient testing for my company and the major focus is on sunscreen actives. USP guidelines for the ingredients is to use a GC...
hi everybody i ve been recently joinned to this groupe. im master of chemical eng and working as sales eng in supplier of lab. instrument in middle east. i am...
Hmmm... I have never transferred any methods between the two techniques. I assume that for a small percentage of compounds this is possible. The organizations...
Diego Zurbriggen
Diego_Zurbriggen@...
Feb 14, 2003 4:58 pm
1498
Reversed phase HPLC with UV detection is a good way to assay for sunscreen actives in complex materials - I've been doing it for several years. Sample ...
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