High performance liquid chromatography (HPLC) and fast protein liquid chromatography (FPLC) are widely used separation techniques in biological research, bioprocessing, and analytical workflows. While the instrumentation and applications differ, both techniques rely heavily on precisely formulated buffers to achieve reproducible, high-resolution separations.
This overview focuses on how HPLC and FPLC buffers are used, what properties matter most, and how to select the appropriate buffer system for your application.
HPLC and FPLC buffers are mobile phase solutions used to transport samples through a chromatography column while maintaining pH, ionic strength, and protein or analyte stability.
These buffers are designed to:
In liquid chromatography, the buffer serves as the mobile phase that carries analytes through the column and directly influences separation efficiency.
While both techniques use liquid chromatography principles, they are optimized for different applications.
HPLC
FPLC
Understanding these differences helps guide buffer selection and preparation.
HPLC and FPLC buffers influence separations through several key parameters:
Selecting the appropriate buffer depends on several factors:
Application type
Detection method
Sample properties
Buffers should be chosen to support both the chromatography method and downstream analysis.
High backpressure
Poor resolution
Protein precipitation
Signal instability
Careful buffer preparation and validation can prevent many common chromatography issues.
Unlike general laboratory buffers, HPLC and FPLC buffers must meet stricter requirements for:
Using non-optimized buffers can compromise column performance and data quality.
Every HPLC and FPLC buffer is unique to the analyte used and the experimental application. Select the appropriate HPLC or FPLC Buffer from the catalog or design your optimal formulation with custom manufacturing options at Boston BioProducts.
HPLC & FPLC are both very prevalent liquid chromatography techniques in biological sciences and each support several application types. Such application types of HPLC & FPLC and include:
Component | Function |
|---|---|
Buffering agents (e.g., HEPES, Tris) | Maintain stable pH |
Salts | Control ionic strength |
Organic modifiers | Improve solubility and separation |
Additives | Enhance stability or reduce non-specific interactions |
Buffer | Description |
|---|---|
Ammonium Bicarbonate Buffer | A weak base buffer with a pKa of 6.4, suitable for neutral to slightly alkaline pH applications and for separating basic analytes. It can be used with polymer columns. It is also compatible with MS detection. |
Acetate Buffer | A weak acid buffer with a pKa of 4.7, suitable for low pH applications and for separating acidic analytes. It can be used with both silica and polymer columns. |
Bis-Tris Propane Buffer | A zwitterionic buffer with a pKa around 6.8, ideal for biological and biochemical applications. Known for its stability and minimal interference with biological processes. |
Borate Buffer | A buffer containing boric acid and its conjugate base, suitable for electrophoresis and enzymatic reactions. Borate buffers are often used in the separation of negatively charged molecules. |
Citrate Buffer | A weak acid buffer with a pKa around 3.1, commonly used in molecular biology and biochemistry. It is effective for antigen retrieval in immunohistochemistry and as a buffering agent in enzymatic reactions. |
Formate Buffer | A weak acid buffer with a pKa of 3.8, suitable for low pH applications and for separating acidic analytes. It can be used with both silica and polymer columns. It is also compatible with mass spectrometry (MS) detection. |
HEPES Buffer | A zwitterionic buffer with a pKa of approximately 7.5 that ensures stable pH conditions during chromatographic separations, enhancing precision in bioanalytical and pharmaceutical applications. |
MOPS Buffer | A zwitterionic buffer with a pKa around 7.2, MOPS Buffer excels in delivering constant pH levels, optimizing separation, and resolution in chromatographic processes. It provides stable pH conditions and is suitable for various biological experiments. |
Phosphate Buffer | A weak base buffer with a pKa of 7.2, suitable for neutral to slightly alkaline pH applications and for separating basic analytes. It can be used with both silica and polymer columns. |
Triethylammonium Acetate Buffers | A volatile buffer suitable for high-performance liquid chromatography (HPLC) and mass spectrometry. Used for the separation of various analytes, particularly in the field of proteomics. |
Triethylammonium Bicarbonate Buffers | A buffer often employed in protein chemistry and mass spectrometry, with a pKa around 8.4. It is volatile and compatible with downstream analyses. |
Triethylammonium Phosphate Buffers | A buffer suitable for ion-exchange chromatography and protein purification. It is particularly useful for applications involving proteins and peptides. |
Tris Buffer | A weak base buffer with a pKa of 8.1, suitable for alkaline pH applications and for separating proteins and nucleic acids. It can be used with polymer columns. |