I'd appreciate some comments here: We're running an analysis using a method that has been in use for some 10 years without problem, but the last two analyses...
CURRIE, KEVIN
K.Currie@...
Jul 2, 2002 10:01 am
1285
Good Morning, Is that right? "10M"?!!!! What is the pH? You have checked the pH of the buffer? It sounds like either the ph is too low and you're stripping...
suggestions in the body of the text. ... From: CURRIE, KEVIN [SMTP:K.Currie@...] Sent: Tuesday, July 02, 2002 5:23 AM To: Chrom-l...
The Shifflet's
shiffty@...
Jul 4, 2002 12:07 pm
1287
Dear All A quick query. We have a bit of money to spend to upgrade an old but reliable Thermoseparations HPLC with the Jones JLC6000 data collection software....
Dr Jonathan Knowles
j.knowles@...
Jul 4, 2002 3:55 pm
1288
Shifting between methanol, acetonitrile, THF and mixtures thereof is a common strategy to tweak the selectivity of a RPHPLC separation of small molecules ...
john.kennedy@...
Jul 8, 2002 8:01 am
1289
hi, I am starting to work on a GC (perkin Elmer, 1990) equiped with ECD and I'm just running blanks now, to adjust the baseline... But it keeps drifting up! I...
I have waters CapLC, binary pump (high pressure mixing). Now the back pressure with 50%B is the higher that 0%B and 100%B. Could you tell me it is normal or...
The best way to check for leaks with an ECD is, with the instrument cold, turn on the detector and observe your baseline. Once it is flat and steady, apply a...
With an instrument this old there are a number of things to check out, some of them relating to the history of the instrument What was this instrument used for...
Patrick_Calway@...
Jul 8, 2002 2:06 pm
1293
... If B is MeOH or acetonitrile and A is aqueous then this is quite normal, a 50:50 mix generally gives the highest back pressure. Peter ... ...
Peter Galettis
GalettisP@...
Jul 8, 2002 11:31 pm
1294
... I have waters CapLC, binary pump (high pressure mixing). Now the back...
jannethruiz@...
Jul 9, 2002 1:57 am
1295
Hi there I am trying to develop a method for the impurities in liquid formulations. I was wondering if there is an article that someone could refer me to about...
Hi there I am trying to develop a method for the impurities in liquid formulations. I was wondering if there is an article that someone could refer me to about...
Depends on what A and B are, but for Methanol/water and Acetonitrile/water, viscosity is a non-linear function of composition. The viscosity of intermediate...
Tom Jupille
joop@...
Jul 9, 2002 11:20 pm
1298
i am develop a method for b -carotene in rice (as a suplemment), the carotene is added before packing. please, can you help me in the best method, i have a...
jannethruiz@...
Jul 11, 2002 12:59 am
1299
Does somebody has a Perkin Elmer Operation Manual for these : 1. Binary LC Pump 250 2. LC Oven 101 3. LC - 95 UV/Vis Detector It will be helpful for me a lot. ...
1st decision is whether to digest the sample before extraction of carotene. For a supplemented rice, it may only be necessary to extract directly with solvent,...
Indyk
indyk@...
Jul 12, 2002 3:11 am
1301
Could one of you please provide the gradient curve information for HP (Agilent). I have a Waters system with methods developed on an HP. The HP method has the...
Hello I am currently analysing anti L selectin (monoclonal antibody) by cIEF. Is there any websites you can recommend to explain the presence of 4 heavy chain...
I am running an Agilent GC-MS and the TIC trace for every injection starts around 500-1000 and it decreases. After about 5 minutes the TIC trace baseline in...
does anyone have a methode for analysis of vitamin b12(cyanocobalamine) in anykind of drink mostly energy drink. i have rp c18 coloum, uv vis detektor, RI...
I need a servicer manual for a Waters 474 fluorescence detektor. Please contact if you have any information. A copy would do quite fine. Regards Hansen...
We have seen this problem before in our lab. The problem is most likely the detector nut connecting the column to the detector interface. I would suggest...
Jakupca, Mick (DOV, ...
mjakupca@...
Jul 15, 2002 2:11 pm
1308
There are really only 5-6 ways to change the selectivity of *any* reversed-phase separation: - mobile phase strength (in this case, gradient steepness) -...
Tom Jupille
joop@...
Jul 15, 2002 7:48 pm
1309
hi does anybody know how to analyze this comppound using HPLC? thank you very much ana...
I have a rather antiquated Dionex IC 4000 that is in need of a new motherboard. Does anyone know where I can find one. Dionex no longer carries them. Thanks,...
We have a number of dionex PDA detectors, and we appear to be having problems with lamps going down at low hours of use (a couple of 100 hours). We don't leave...
CURRIE, KEVIN
K.Currie@...
Jul 19, 2002 8:59 am
1312
Hello Corey, Try LabX (http://www.labx.com) - you can place a <wanted to buy> ad there for free. I have had success in the past with obtaining parts for...
Tony Herlt
herlt@...
Jul 19, 2002 10:04 am
1313
Hello Kevin, Might be worth having the lamp power supply looked at - it may be that it is fluctuating and ageing the lamp unduly. We had a strange problem...
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