What is HBSS? Which HBSS is Used When?

HBSS (Hank’s Balanced Salt Solution) is a balanced salt solution used in cell culture applications to maintain the physiological pH and osmotic balance of cells.

The primary function of this solution is to ensure that cells remain stable outside the culture medium for a short period of time and to prevent the degradation of cellular structures.

HBSS formulation was developed by John H. Hanks and is widely used today in cell washing, transport, passage, and preparation processes.

Basic Functions of HBSS

HBSS solutions perform the following basic functions:

• To maintain physiological ionic balance
• To maintain the osmotic stability of cells
• To ensure the short-term stability of cells to support continuous viability
• To create a controlled environment during cell culture processes

HBSS Variants and Their Uses

Depending on different experimental needs, HBSS is used in different variants. These variants show different biological effects according to the ions and buffer systems they contain.

HBSS (+Ca, +Mg)

Calcium and magnesium ions support the functions of proteins (e.g., integrins and cadherins) that play a role in cell adhesion. Therefore, this variant is preferred in applications where maintaining cell adhesion to the surface is desired.

HBSS (-Ca, -Mg)

The absence of calcium and magnesium ions weakens cell-cell and cell-surface interactions. This feature provides an advantage, especially before cell separation, passage, and trypsin applications.

HBSS + Phenol Red

HBSS containing Phenol Red allows for visual monitoring of the pH of the medium. pH changes can be easily followed by the change in the color of the solution.

This feature is preferred, especially in experiments where environmental stability is critical.

HBSS (HEPES Buffered)

The HEPES buffer system provides pH stability without CO2 dependence, compared to the bicarbonate buffer system. Therefore, this variant is used in studies conducted outside of CO2 incubation and in open systems.

Which HBSS Should Be Chosen When?

• In situations where cell adhesion needs to be preserved → HBSS (+Ca, +Mg)
• In cell separation or passage processes → HBSS (-Ca, -Mg)
• In experiments where ambient pH changes need to be monitored → HBSS + Phenol Red
• In CO2-independent ambient conditions → HBSS (HEPES buffered)

Evaluation

The choice of HBSS is an important parameter that should not be overlooked in cell culture experiments. The variant used has a direct effect on cell behavior, adhesion, viability, and the accuracy of experimental results. Therefore, selecting the appropriate HBSS variant for the experimental design is critical for obtaining reliable and reproducible results.