Dear colleges, I would like to know if some of you has experience in the dissolution test for papaverine (not the hydrochloride) sugar-coated or coated...
Dear Chrom-L members, It's been so long not to contact you all. Well, I am interesting to learn about the organic dyes especially methylene blue. I want to...
Dear chromatographers, Chromatographers generally talk only about selection of column, but they seldom talk about the practical preparation of chromatographic...
can anybody help me in estimation of tegafur by HPLC(chomatographic conditions) ... How much free photo storage do you get? Store your friends n family photos...
Dear all, As I know all of you know about ion exchange resins. I decided tell my problem here hopefully you help me. I know we can regenerate cationic and...
My name is Taranu Anca, I'm PhD student in GPC characterisation of polymers. I have an old Waters 519 HPLC Pump, 8500N and I need an installation guide. ...
My name is Taranu Anca, I'm PhD student in GPC characterisation of polymers. I have an old Waters 510 HPLC Pump, 8500N and I need an installation guide. In my...
Hello friends I am testing Polyphenols (as Gallic Acid or Chlorogenic Acid) by UV. Does any one of you know if there is an HPLC test method? Thank you and good...
Hi I'm a student and looking for a GC method to analyse phytosterol (beta-sitosterol, campesterol...) in natural extract. This method should be validated...
This is an offical italian method for the analysis of sterols in olive oil: http://www.oliveoil.org/ita/allegati-norma1/allegato5.htm bye Stefano Stefano...
Hello, I want ask you kindly if somebody have this book Aqueous size exclusion chromatography, P.L Dubin, Ed.Elsevier Science, Publishers, Amsterdam. 1988 Anca...
My name is Taranu Anca, I'm PhD student in GPC characterisation of polymers(Romania) I have an old Waters 519 HPLC Pump, 8500N and I need an installation...
Hello group members I am working with a waters hplc (2695 separations module) with a PAD (2996) and was wondering if anyone could recommend (via experience) a ...
Melissa, Our column expert advises the following... Our AXXI-Chrom columns (ODS 5um 150 x 4.5 or 250 x 4.6) would do fine. If the client is seeing a high back...
in gas shromatography ethanol and other alcohol peaks tend to tail considerably, making quantitative anaylisis difficult by simple flame ionizaton detection. a...
Hello, I want to measure by GPC with RI and UV detector aqueous polymers solutions starting for example with poly(4-vinylpyridinium) soluble in water+methanol ...
Melissa - It doesn't sound so much like you need a different column, but a better way of keeping insolubles off of the head of your column. Depending upon...
Using a UV detector in HPLC.... Does the area of a peak (standard) change when I change the mobile phase ? Can I presume an area of a peak, and change the...
Hi I apparently didn't reply correctly to the group but this is what I had written to Al previously: Hi Al Thank you for replying- My initial pressure for the...
The Arizona Dept of Agriculture in Phoenix, AZ is looking for a Chem II. To find more information about the job go to http://www.azstatejobs.gov/ click the...
What if a HPLC system the pressure doesn't get to the normal and there is no leaking ? It's normally at 180 kgf, but now it's abotu 100.... Any idea ? Good...
- air in the system - check valves malfunction Kind regards, Matthias "chang" <chang@...> Gesendet von: chrom-L@yahoogroups.com 07.07.2005 15:32 An: ...
matthias.kummer@...
Jul 14, 2005 10:40 am
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Dear friends, I am the member of the group but used to interact very rarely due to my hectic job schedule and also busy life with my an year old baby at home....
One suggestion is to check the flow output. Is it really delivering 1 mL over one minute? (or whatever you set it for.) Perhaps you have an insufficient inlet...
First check your flow rate by collecting the flow at outlet end of column. Either the pump, leak or the column. If pump, could be check valve or leak. ...
Hi somebody has experience with aminoacid derivatization using ethylchloroformate. I'm trying to derivatize homocysteine in body fluids. but neither in the...
Hi, Is this a new column that has the low pressure? Did you change particle size for the column (5 µ particle column is normal but now you have a 10 µ...
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