EDQM publishes revised Ph. Eur. Water Monographs for public comment

The European Directorate for the Quality of Medicines & HealthCare (EDQM) has recently published updated versions of three water monographs in the European Pharmacopoeia (Ph.Eur.):

• Water for injections (0169)
• Purified water (0008)
• Total organic carbon (TOC) in water for pharmaceutical use (2.2.44)

The updates include some key clarifications:

Water for Injection (0169)

TOC Limit Adjustment: to reduce ambiguity, the upper limit for Total Organic Carbon (TOC) has been restricted from 0.5 mg/L to 0.50 mg/L.

Testing Requirements: the requirement to test oxidisable substances (OS) in “Sterilized Water for Injection” (SWFI) has been superseded by the introduction of the mandatory use of the total organic carbon (TOC) method B. This change simplifies the testing procedure by focusing solely on TOC measurements.

The TOC test is a state-of-the-art quantitative method that is more sensitive and non-selective than the OS test for the control of organic impurities present in pharmaceutical waters.

Residue on Evaporation: the “Residue on Evaporation” test, which measures non-volatile residue, has been changed from percentage to parts per million (ppm), offering a more standardized expression of the results.

Purified Water (0008)

Harmonization with WFI Standards: the TOC limit for Purified Water has also been aligned with the update to Water for Injection, now set at a 0.50 mg/L.

Standardized Units: for “Purified Water in Containers,” the measurement unit for “Residue on Evaporation” has changed from percentage to ppm, standardizing the way results are reported.

Total Organic Carbon in Water for Pharmaceutical Use (2.2.44)

Clarification of Water Specifications: the term “highly purified water” has been replaced with “water,” which corresponds to the specifications conductivity LF of ≤ 1.0 µS/cm at 25 °C and a TOC level of ≤ 0.1 mg/L.

Moreover, in the proposed revision of chapter 2.2.44, the reagents sucrose R and 1,4-benzoquinone R have been replaced by chemical reference substances (CRSs) to streamline the application of the TOC test.

The commenting period runs until 30 September 2024.

SOURCES:

The monographs can be found in draft status on the website of the European Pharmacopoeia.

More information on how to comment is available at: “Comment on drafts (Pharmeuropa)”.