Differential Phytate Utilization in Candida species
| Autor: | Paul Wai-Kei Tsang |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
food.ingredient
Phytic Acid Veterinary (miscellaneous) chemistry.chemical_element Calcium Biology Applied Microbiology and Biotechnology Microbiology Phosphates Agar plate chemistry.chemical_compound food Enzyme Stability Humans Agar Candida 6-Phytase Mouth Phytic acid Phosphorus Temperature Hydrogen-Ion Concentration Phosphate Corpus albicans Culture Media chemistry Phytase Agronomy and Crop Science |
| Zdroj: | Mycopathologia. 172:473-479 |
| ISSN: | 1573-0832 0301-486X |
| DOI: | 10.1007/s11046-011-9453-3 |
| Popis: | The present study was undertaken to evaluate and characterize the phytase activity in different Candida species. A total of 113 Candida isolates representing eight species were examined for phytase activity by an agar plate assay using the calcium salt of phytic acid as the sole phosphorus source. A phytase-positive phenotype was identified by the formation of a clear halo around a fungal colony. Cell-bound differential phytase activity was observed in Candida isolates at inter- and intra-species levels. Although phytase activity was not affected by the supplementation of external phosphate in C. albicans, C. dubliniensis, C. glabrata, and C. kefyr, elevated phytase activity was evident in C. guilliermondii, C. krusei, C. parapsilosis, and C. tropicalis in phosphate-free medium. Further characterization showed that, in general, relatively higher phytase activity was observed at more acidic pHs, and the phytase activity increased with incubation temperature, reaching a maximum at 55 or 65°C. Taken together, the findings demonstrated, for the first time, differential phytase activities in different Candida species. Phytase activity may be a contributing factor to fungal survival and proliferation within the human gastrointestinal tract, where nutrients are usually scarce. |
| Databáze: | OpenAIRE |
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