Use of Three Optical Systems to Obtain a Microscopic Profile of Asbestos and Other Nonopaque Particulate Matter Larger than 5 μm in Parenteral Drugs
Keyword(s):
Abstract A comparative microscopic study of chrysotile fibers was conducted, using 3 sequential optical systems: plane polarized light (PL), phase contrast (PC), and Nomarski differential interference contrast (NDIC) for complementary image analyses. The introduction of NDIC for qualitative and quantitative analyses of particulate matter >5 μm resolves the problem of diffraction halos encountered in PC microscopy. High optical contrast, the instrumental characteristic of NDIC, is particularly useful for the detection of chrysotile fibers at a magnification of 500 ×.
1971 ◽
Vol 81
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pp. 1090-1118
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1988 ◽
Vol 46
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pp. 990-991
2012 ◽
Vol 37
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pp. 137-147
2008 ◽
Vol 56
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pp. 3438-3443
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