What is the primary use of high-performance liquid chromatography (HPLC)?

• A. For measuring pH levels
• B. Separation of thermolabile compounds
• C. Screening for infectious diseases
• D. Electrolyte analysis in urine

Answer: (B)

The primary use of high-performance liquid chromatography (HPLC) is indeed the separation of thermolabile compounds. HPLC is a sophisticated technique that allows for the analysis and separation of various substances in a mixture based on their interaction with a stationary phase and a mobile phase. It is particularly advantageous for compounds that may be sensitive to heat, as it operates at relatively low temperatures compared to other methods, such as gas chromatography. This makes HPLC ideal for analyzing pharmaceutical compounds, biological samples, and other substances that could degrade or alter under high temperatures.

In contrast, measuring pH levels involves different methods such as pH meters or indicators, which do not utilize chromatographic techniques. Screening for infectious diseases typically utilizes immunoassays or molecular methods rather than HPLC, as those methods are more specific and faster for detecting pathogens. Lastly, electrolyte analysis in urine is more often performed with direct ion-selective electrodes or other techniques, rather than HPLC, which is not the optimal choice for routine electrolyte testing.