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Poll You are developing an HPLC method for a basic compound. After injecting the sample, you observe poor...
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Use of a C18 column with a mobile phase pH = 3.0
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The mobile phase contains ion-pairing reagent
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Injection volume is too low
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Column temperature set at 60°C
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HPLC basicmolecules hplc methoddevelopment peakshape
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Avatar youhana Hosny 7 m ago

Think about the pKa of basic drugs – how are they charged at low pH?

Consider the stationary phase – what happens when silanol groups are not masked?

Peak fronting/tailing + retention issues = possible secondary interactions or ionization mismatch.

Which condition increases interaction with residual silanols?

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Frequently Asked Questions: HPLC Analysis & Chromatography

High-Performance Liquid Chromatography (HPLC) is an analytical technique used to separate, identify, and quantify each component in a mixture. It relies on a pump to pass a pressurized liquid solvent containing the sample mixture through a column filled with a solid adsorbent material. Each component in the sample interacts slightly differently with the adsorbent material, causing different flow rates for the different components and leading to the separation of the components as they flow out of the column.

Column efficiency is typically measured by the number of Theoretical Plates ($N$). The most common formula is $N = 16 \times (t_r / W)^2$, where $t_r$ is the retention time and $W$ is the peak width at the base. A higher number of theoretical plates indicates a sharper peak and better analytical separation. You can calculate this instantly using our Theoretical Plates Calculator.

The ICH (International Council for Harmonisation) Q2(R1) guidelines mandate specific validation parameters for HPLC methods. These include assessing Accuracy, Precision (Repeatability and Intermediate Precision), Specificity, Detection Limit (LOD), Quantitation Limit (LOQ), Linearity, and Range. Our calculators are designed specifically to help analysts easily compute these linearity, LOD/LOQ, and %RSD parameters in compliance with ICH standards.
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