Riggin A, Luu VT, Lobdell JK, Wind MK. A non-isotopic probe-hybridization assay for residual DNA in biopharmaceuticals.
J Pharm Biomed Anal 1997;
16:561-72. [PMID:
9502152 DOI:
10.1016/s0731-7085(97)00152-0]
[Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Although most biopharmaceuticals are highly purified, there is a theoretical concern that such recombinant products could be contaminated with oncogenic or bacterial DNA. A crucial part of the control of such biologicals is to ensure they do not contain more residual DNA than a safety limit suggested by the regulatory agency. Currently, the FDA has suggested a 100 pg per dose limit for residual DNA. DNA probes labeled with a radioisotope such as 32P have been commonly used in hybridization tests. Because of the radiation safety concern, we chose to develop a procedure for assessing DNA levels by either a dot or slot blot hybridization technique using a nonisotopic DNA probe and immuno-enzymatic detection. A minimum detectable limit (MDL) of < 10 pg DNA mg(-1) protein can be achieved. Method validation data demonstrated that the precision, reproducibility, and robustness of this approach are appropriate for quality control.
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