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. 2013 Oct;3(10):816-21.
doi: 10.1016/S2221-1691(13)60161-6. Epub 2013 Sep 4.

In vitro activity of natural honey alone and in combination with curcuma starch against Rhodotorula mucilaginosa in correlation with bioactive compounds and diastase activity

Moussa Ahmed  1 , Noureddine Djebli, Saad Aissat, Baghdad Khiati, Abdelmalek Meslem, Salima Bacha
Affiliations

In vitro activity of natural honey alone and in combination with curcuma starch against Rhodotorula mucilaginosa in correlation with bioactive compounds and diastase activity

Moussa Ahmed et al. Asian Pac J Trop Biomed. 2013 Oct.

Abstract

Objective: To evaluate the in vitro activity and synergism of the combinations of natural honey and curcuma starch against Rhodotorula mucilaginosa in correlation with total phenolic, flavonoid contents, and diastase activity.

Methods: The Folin-Ciocalteu test was used to determine the total polyphenols content and the flavonoid content was analyzed using by the aluminum chloride method. The antifungal activity of the natural honey, determined by an agar well diffusion assay and agar incorporation method.

Results: Total phenolic content varied from (63.930.11) to (95.366.08) mg GAE/100 g honey as gallic acid equivalent. Total flavonoids content varied from (5.41±0.04) to (9.94±0.54) mg CE/100 g. Diastase activity values were between (7.3±2.8) and (26±2.8). The zone inhibition diameter for the six honey samples without starch ranged between 6 and 20 mm. When starch was mixed with honey and then added to well, a zone inhibition increase diameter 7 and 21 mm. The percentage increase was noticed with each variety and it ranged between 5% and 62.5%. The minimal inhibitory concentrations for the six varieties of honey without starch against Rhodotorula mucilaginosa ranged between 28% and 36% (v/v). When starch was incubated with honey and then added to media, a minimal inhibitory concentration drop has been noticed with each variety. It ranged between 6.66 % and 20% (w/v). No significant correlation was established between diastase activity and bioactive compounds.

Conclusions: The mixture of curcuma starch and honey could lead to the development of new combination antibiotics against Rhodotorula infections.

Keywords: Bioactive Compounds; Curcuma starch; Diastase number; Honey; Rhodotorula mucilaginosa.

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Conflict of interest statement

Conflict of interest statement: We declare that we have no conflict of interest.

Figures

Figure 1.
Figure 1.. Diastase activity of the honey samples (mean±SD; n=3).
Figure 2.
Figure 2.. Ttotal phenolic content of six honey samples (mean±SD; n=3).
Figure 3.
Figure 3.. Total flavonoid content of six honey samples (mean±SD; n=3).
See this image and copyright information in PMC

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