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Antifungal Activity of Quinonoid Natural Products against Clinical Isolates of Candida spp.
1. Antifungal Activity of Quinonoid Natural
Products against Clinical Isolates of Candida spp.
Dr. Diganta Dey
Ashok Laboratory Clinical Testing Centre Pvt. Ltd.
Kolkata
2. Study Protocol
• Species identification of Candida isolates from
different clinical specimens in Vitek2 Compact
using ID-YST cards
• Sensitivity testing against the common
antifungal drugs by disk diffusion method
• Assessment of the activity of quinonoids
natural compounds against these isolates
• Comparison of MIC in broth microdilution:
Quinonoids vs commercial drugs
12. MIC (μg/mL) of Antifungal Drugs
Sl. No. Candida spp./ lD AP FLC VRC KT CAP
13 C. Famata /19070 <0.25 4 8 8 0.5
14 C. tropicalis/ 37509 32 64 0.5 64 32
15 C. tropicalis/ 37279 0.5 32 1 128 <0.25
16 C.krusei/ 47294 2 32 34 1 1
17 C.krusei/ 47443 <0.25 0.5 1 2 <0.25
18 C. albicans/ 39314 1 64 32 128 16
19 C. albicans/ 45855 2 128 256 64 4
20 C. Albicans ATCC 60193 0.5 1 <0.25 2 <0.25
21 C. krusei ATCC 34135 <0.25 16 1 0.5 0.5
22 C. glabrata ATCC 90030 <0.25 0.5 0.5 1 <0.25
23 C. parasilosis ATCC 22019 0.5 1 <0.25 2 <0.25
AP: amphotericin B, FLC: fluconazole, VRC: voriconazole, KT: ketoconazole,
CAP: caspofungin
13. Conclusions
• In current study, 55% of candidemia was
found to be associated with C. krusei, and 27%
was caused by C. tropicalis
• Most of such infections (55%) were observed
in newborns (Data not shown)
• Out of 19, 9 isolates (47%) were resistant to
any 4 tested drugs, while 2 isolates (10.5%)
were found to be resistant to all 5 tested
antifungal agents
14. Conclusions
• All the tested quinones exhibited broad
spectrum antibacterial activity (lowest MIC
<0.25 μg/mL)
• The antifungal activity of these compounds
were more or less comparable with the
commercial drugs
• The order of antifungal activity of the tested
quinonoids was Plumbagin > Juglone >
Menadione > Lawsone > Emodine