Have someone an explanation about peak tailing in chromatograms where GC/ELCD (electrolytic conductivity detector)is used in halogen mode? Is this tailing...
Dear all! Any body know about application note/methode to separate cellulose mononitrat, cellulose dinitrat & cellulose trinitrat using HPLC? Thank's for your...
aprianty@...
Mar 7, 2002 2:18 am
1126
Prova...
Gianfranco Bruno
supergiaf@...
Mar 7, 2002 5:48 am
1127
Dear All We are doing a urinary catecholamine analysis, and the samples may have to be frozen over a period of several months. Can anyone reccommend a protocol...
Hi, I would select a few montior compounds, prepare a standard of the monitor compounds and set limits (based on experience with the method) for precision (n=5...
The Shifflet's
shiffty@...
Mar 8, 2002 9:57 am
1129
In our lab we are operating a Gc-6890/MS-5973 from Agilent, and we are measuring permanent gases. The last 6 months I am facing problems with a MS drift of...
There might be problems with PLOT capillaries, there is a new product line I think they call it pro-gas or something like that. I think you should try it....
What is your opinion about the system ASPEC from Gilson.Is it this system really make an automation of the HPLC ? thank you gb \\\\\\I////// ( @ @ ) ... ...
Gianfranco Bruno
supergiaf@...
Mar 13, 2002 2:44 pm
1132
Gateway Computer Users: If you are using a Gateway computer with "Gateway GoBack" software by WildFile running in the background, you may experience lockups in...
N. Pasadakis
pasadaki@...
Mar 15, 2002 1:44 pm
1134
Dear friends : On february, 27th, I posted a message asking you about how to find special standards or reference substances to buy, mainly about Benzathine....
Hello. I'm trying to do, by HPLC, the analysis of the mentioned mixture. My objective is the quantification of the boldine (The most important to me), and...
Dear Rodrigo, I have no personal experience with this analysis, but after having looked at the chemical structure of Boldine, I would substitute 0.1% ...
Tony Herlt
herlt@...
Mar 18, 2002 10:27 pm
1137
Dear colegues : I'm looking for the following article : "Quantitative determination of boldine in leaves of Peumus boldus of different provenances -...
hi, does anybody know which filter membranes can I use if I need to filtrate samples containing artificial colorants? Someone told me that I can't inject that...
Hi I wonder if you can help me. I am studying a single honors degree in Forensic Science at lincoln university in England. I am starting my dissertation at...
Hi, It depends upon the physical make up of the samples. If you are trying to remove solids a teflon or nylon syringe filter will work fine. If your sample...
The Shifflet's
shiffty@...
Apr 1, 2002 2:49 pm
1142
Is it possible to analyze water soluble vitamins by LC/Ms without using phosphate buffer. Can anyone have information about this can be accomplished in ...
Hi, I am looking into headspace GC for blood alcohols. Is there anyone who is who is doing this? What type of system are you using? What type of column? What...
I need to know about the information about the application of LC/MS for Water soluble vitamins, Sugars, Pesticides and Food Preservatives. Khalid Ghaffar Saudi...
Dear Colleagues: We are trying to analyze some of the amino acids found in a frozen meal (Alanine, Threonine , Glutamine....) beside some of the carbohydrates...
yhassan
yhassan@...
Apr 4, 2002 7:50 pm
1146
Dear friends : At Martindale 32nd ed., page 1580, they say that the Troxerutin is in the German pharmacopeia (DAB). But, I do have the DAB, and I didn't find...
Needed: Viscosity Data on Water/THF Mixes. I am doing some chromatography using a water and THF gradient. Recently, I ran into some interesting flow and...
Hi, We have a Dionex Model is DX-300 ion chromatography system with the software is AI-450 version 3.32.00 currently running on a Windows 3.1 platform. We are...
Victor Leung
victorl@...
Apr 5, 2002 7:25 am
1149
Dear colleagues, Has anyone had experience with analysing 2-methylglutaronitrile, NCCH2CH2CH(CH3)CN, or similar aliphatic dinitriles, by GC? I was initially...
Tony Herlt
herlt@...
Apr 5, 2002 7:26 am
1150
Hi I am looking for a simple method to detect malic acid levels in red wine but at the moment I have problems with large peaks preceeding malic acid (tannins...
Hi Christy, I'm working with this analysis too. I need to know what's your intent, ie, forensic or clinical. Well, I'm using a GC Shimadzu with capilary column...
Hi Victor, We run a similar version under Windows 95. I think Windows 98 will also be okay. As a precaution, make sure you don't delete any of the old files ...
Phil, Thank you very much for your response! I'm very happy to learn that our system is compatible with Windows 95. However, when we tried to install the ...
Victor Leung
victorl@...
Apr 6, 2002 6:32 pm
1154
Dear Robert, I think that any technique or resulted on standardizations would have to be published. When I started to search on techniques that I could use...
Hi all, Thanks to everyone for their response to the Headspace GC question I had last week. I received a lot of answers. Now I have another question. I'm...
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