F
OOD AND
D
RUG
A
DMINISTRATION
O
FFICE OF
R
EGULATORY
A
FFAIRS
Office of Regulatory Science
Document Number:
ORA.007
Revision #: 02
Revised:
25 Aug 2020
Title:
Pharmaceutical Microbiology Manual
Page 39 of 92
For the most current and official copy, check QMiS.
rinse solution in the 20 x 150 mm tubes. Do not allow the
water in the sonicator to exceed 38°C.
viii. Vortex the tubes for 2 minutes. Remove a portion of the
eluate (5 – 10 mL) for LAL testing. If the eluates are not
tested immediately for endotoxin, they should be refrigerated.
All eluates must be tested within 24 hours of extraction. Prior
to analysis vortex at least one minute.
2. Alternative Diluent Examples (Verify prior to use):
Diluent/Buffer
Interfering Factor
Pyrosperse
™
Endotoxin Binding or Masking
Β-G-Blocker®
Enhancement due to β-glucans
Tris Buffer 50mM solution
Strongly Acidic (pH < 6) or Basic
(pH > 8)
Magnesium chloride (MgCL
2
)
10mM solution
Chelating
Note: Always use LRW as the diluent for the CSE standard serial dilutions.
3. Test the sample eluate from the medical device extraction, using the
bacterial endotoxins test (BET) assay parameters, procedures,
standards, and controls for the gel-clot, kinetic chromogenic or
turbidimetric, or endpoint assays, as directed in USP<85> and
USP<161>.
D. Endotoxin References
1. United States Pharmacopeia (USP) Chapter <85> Bacteria
Endotoxins Test. Official, Current Version.
2. USP <161> Medical Devices – Bacterial Endotoxin and Pyrogen
Tests, Current
Version.
161>85>161>85>
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