Knowledge Base

In this article, we review and analyze one of the tasks on the practical stage of the 4th Welch Materials Cup, Separation of Multiple Polar Nucleobases. We thoroughly analyze the key challenges during the method development where participants may easily lose points, briefly explain how participants are scored in the competition, and the logic in HPLC method development.

The 2026 Welch Materials Cup Chromatography Competition, held in China from July to August 2026, featured a number of questions designed to assess more than simple knowledge recall. Many of the questions focused on the ability to connect chromatographic theory with practical applications and to apply fundamental principles when faced with complex analytical conditions. In this article, we have selected 11 representative questions that showed the highest error rates and translated both the questions and their detailed analyses into English.

When considering HPLC column replacements, cross-reference charts can only tell half the story. Read to learn how a right Welch Column goes beyond replacement—delivering optimized results tailored to your method.