{"id":126692,"date":"2026-06-27T19:34:03","date_gmt":"2026-06-28T01:34:03","guid":{"rendered":"https:\/\/purmabiologics.com\/blog\/?p=126692"},"modified":"2026-08-17T14:57:49","modified_gmt":"2026-08-17T20:57:49","slug":"ebss-vs-hbss","status":"publish","type":"post","link":"https:\/\/purmabiologics.com\/blog\/ebss-vs-hbss\/","title":{"rendered":"EBSS vs HBSS: Key Differences and When to Use Each"},"content":{"rendered":"
\n

EBSS and HBSS are balanced salt solutions used for washing, transport, dilution, and short-term cell handling. Both help maintain osmotic balance and supply inorganic ions, but their typical bicarbonate concentrations differ.<\/p>\n

A standard EBSS formulation commonly contains approximately 2.2 g\/L sodium bicarbonate, while standard HBSS commonly contains approximately 0.35 g\/L. This generally makes EBSS better suited to CO\u2082-equilibrated workflows and HBSS convenient for short procedures performed outside the incubator.<\/p>\n

Exact formulations vary. Both solutions are available with or without calcium, magnesium, phenol red, glucose, and bicarbonate, so researchers should verify the product formulation against their protocol.<\/p>\n

Quick Answer<\/span><\/p>\n

Choose EBSS for workflows designed around a CO\u2082\/bicarbonate buffering system. Choose HBSS for common washing, transport, dilution, and short bench procedures. Always confirm the bicarbonate and calcium\/magnesium content of the specific formulation.<\/p>\n<\/div>\n

\n
\"PurMa
EBSS<\/figcaption><\/figure>\n
\"PurMa
HBSS<\/figcaption><\/figure>\n<\/div>\n
\n

From PurMa Biologics<\/p>\n

Both, at 1X pH 7.4<\/p>\n

PurMa manufactures Hanks’ and Earle’s balanced salt solutions in house, with and without calcium and magnesium.<\/p>\n

Hanks’ BSS (HBSS)<\/a>Earle’s BSS (EBSS)<\/a><\/p>\n

Made in the USA and manufactured in house. Certificate of Analysis with every lot.<\/strong> Bulk pricing, purchase orders and custom formulations welcome.<\/p>\n<\/div>\n

What Is EBSS (Earle’s Balanced Salt Solution)?<\/h2>\n

Earle’s Balanced Salt Solution contains a high concentration of sodium bicarbonate, which makes it ideal for use inside a 5% CO2 incubator. The CO2 in the incubator works with the bicarbonate to keep pH stable. Because of this, EBSS is often used as the base for CO2-buffered media such as MEM<\/a>, and for procedures where cells stay in a CO2 environment.<\/p>\n

What Is HBSS (Hanks’ Balanced Salt Solution)?<\/h2>\n

Hanks’ Balanced Salt Solution contains a low concentration of sodium bicarbonate, which lets it hold a stable pH in normal room air without a CO2 incubator. This makes HBSS the go-to choice for bench work \u2014 washing cells, preparing for dissociation, or any short procedure done outside the incubator.<\/p>\n

EBSS vs HBSS: Key Differences<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
Factor<\/th>\nEBSS<\/th>\nHBSS<\/th>\n<\/tr>\n<\/thead>\n
Typical sodium bicarbonate<\/td>\nApproximately 2.2 g\/L<\/td>\nApproximately 0.35 g\/L<\/td>\n<\/tr>\n
Common environment<\/td>\nCO\u2082-equilibrated workflows<\/td>\nShort bench procedures and handling<\/td>\n<\/tr>\n
Common uses<\/td>\nIncubator-associated procedures and media preparation<\/td>\nWashing, transport, dilution, and dissociation preparation<\/td>\n<\/tr>\n
Calcium\/magnesium options<\/td>\nAvailable with or without<\/td>\nAvailable with or without<\/td>\n<\/tr>\n
Complete growth medium?<\/td>\nNo, unless incorporated into a validated complete formulation<\/td>\nNo, unless incorporated into a validated complete formulation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

When to Use EBSS<\/h2>\n

EBSS is the right choice when:<\/p>\n