How can I fix poor peak shape for phosphorylated compounds in aqueous normal phase ANP methods – FAQ

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ARTICLES, APPNOTES, FAQ (9289)
- AppNotes Library (1888)
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- Frequently Asked Questions?? (3402)
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April 14, 2020
Bill Ciccone

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All PEEK HPLC Columns Information / ANP Aqueous Normal Phase Articles / ARTICLES, APPNOTES, FAQ / HPLC Tips and Suggestions / TYPE-C in General FAQ

We have a number of strategies for fixing problems with peak shape for phosphorylated compounds:

Ensure the column is not overloaded. We recommend an injection volume of 1 µL or less with aqueous normal pase ANP methods.
Use Teflon bottles instead of borosilicate glass for your mobile phase reservoirs. Sodium from the glass can cause peak shape problems for anionic compounds.
Use 5–10 microM EDTA or medronic acid in the mobile phase and sample diluent. This will help chelate metals that cause problems for phosphates.
Try adding 0.01% ammonia to the sample diluent.
Try using a Cogent, metal free, coated stainless steel column.

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Related Articles

1) Injection volume suggestions for Cogent TYPE-C HPLC columns – Tips & Suggestions

2) Add 10 micro molar EDTA or medronic acid to mobile phase for better peak shapes – Tips & Suggestions

3) When and why use Teflon bottles for your mobile phase reservoirs – FAQ

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