NDLI: Evaluation of a Spectrophotometric Broth Microdilution Method for Determining Fluconazole Susceptibility of Candida albicans: Influence of RPMI and RPMI-2% Glucose on the Selection of Endpoint Criteria

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Evaluation of a Spectrophotometric Broth Microdilution Method for Determining Fluconazole Susceptibility of Candida albicans: Influence of RPMI and RPMI-2% Glucose on the Selection of Endpoint Criteria

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Evaluation of a Spectrophotometric Broth Microdilution Method for Determining Fluconazole Susceptibility of Candida albicans: Influence of RPMI and RPMI-2% Glucose on the Selection of Endpoint Criteria

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yi, J. Y. Shin, J. H. Lee, K. W. Yong, D. E. Yang, S. J. Suh, S. P. Ryang, D. W.
Description	Responsible library: WPRO
Abstract	BACKGROUND: Minimum inhibitory concentration (MIC) endpoint determination is the major varia-tion source for the fluconazole susceptibility test, especially for Candida albicans. In this study, we evaluated spectrophotometric broth microdilution methods using RPMI 1640 and RPMI supple-mented with 18 g of glucose per liter (RPMI-2% glucose) for determining fluconazole susceptibility of C. albicans. METHODS: A total of 129 clinical isolates of C. albicans were tested by the broth microdilution method using RPMI and RPMI-2% glucose. The MIC endpoint was calculated objectively with the spectrophotometer set at 405 nm. These results were compared to those by the National Commit-tee for Clinical Laboratory Standards (NCCLS) macrodilution method and the agar dilution method. RESULTS: The mean absorbances in the drug-free wells in RPMI and RPMI-2% glucose were 0.208 +/- 0.014 and 0.316 +/- 0.061, respectively, at 24 h and 0.339 +/- 0.094 and 0.530 +/- 0.104, respectively, at 48 h (P < 0.01). The agreement of the microdilution method with the RPMI within two doubling dilutions of the macrodilution reference were 91.5% (118/129) at 24 h and 76.7% (99/129) at 48 h. The percentage of agreement in the microdilution method with the RPMI-2% glucose were significantly higher: 100% (129/129) at 24 h and 99.2% (128/129) at 48 h (P < 0.01). In addition, the MIC endpoints were easier to detect in RPMI-2% glucose, because of the greater difference in absorbance in between grown wells and fluconazole-inhibited wells (P < 0.01). CONCLUSIONS: The spectrophotometric microdilution method with RPMI-2% glucose may have an excellent agreement with the NCCLS broth macrodilution method and may provide more easily determined MIC endpoints for fluconazole susceptibility testing for C. albicans.
File Format	HTM / HTML
ISSN	22343806
e-ISSN	22343814
Journal	The Korean Journal of Laboratory Medicine
Issue Number	3
Volume Number	22
Language	Korean
Publisher	Korean Society for Laboratory Medicine
Publisher Date	2002-01-01
Publisher Place	Korea (South)
Access Restriction	Open
Subject Keyword	Discipline Medical Laboratory Technology Glucose Lower Case Aitch Fluconazole Agreement Carbon Ion
Content Type	Text
Resource Type	Article
Subject	Biochemistry (medical) Clinical Biochemistry

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