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American Journal of Applied Sciences 6 (6): 1067-1069, 2009
ISSN 1546-9239
© 2009 Science Publications
Corresponding Author: Zahra Atai, Department of Oral Medicine, Faculty of Dentistry,
Kerman University of Medical Sciences, Kerman, Iran
1067
Inhibitory Effect of Ginger Extract on Candida albicans
1
Zahra Atai,
2
Manijeh Atapour and
3
Maryam Mohseni
1
Department of Oral Medicine, Faculty of Dentistry,
Kerman University of Medical Sciences, Kerman, Iran
2
Clinical Laboratory Doctor, Neuroscience Research Center,
Kerman University of Medical Sciences, Kerman, Iran
3
Dentist, Farhangian Dental Clinic, Khajoo Street, Kerman, Iran
Abstract:Problem statement:The fungal infections could be life-threatening in immunocompromised
patients. Candida albicans is the most frequent fungi in the oral cavity. Approach: The first step for
treatment could be done using topical antifungal agents. Nystatine is a choice for mentioned usage but
there are some problems in its using including: unfavorite taste, frequency of usage, etc. Finding better
replacements is the subject of many studies. Results: This study was carried out to find an alternative
for Nystatine. The study was designed based on laboratory investigations to investigate the antifungal
activity of zingiber offcinale (Ginger) on Candida albicans. Candida albicanse (PTCC 5027,
ATCC10231) was obtained from Iranian microbial collection and was confirmed by Germ Tube
formation test. Ethanolic ginger extract was prepared. The antifungal activity of the extract was
determined using Agar dilution and disc diffusion techniques. Data were analyzed by ANOVA test.
Conclusion/Recommendations:The results showed that the ethanolic extract was effective on
Candida albicans (2 mg mL
−1
) at the concentration of 1:5. The study indicates that ginger extract
might have promise in treatment of oral candidiasis.
Key words: Zingiber officinale, antifungal activity, Candida albicans
INTRODUCTION
The incidence of serious infections caused by
yeast, particularly species of Candida, has increased
dramatically during the past decade. Oral candidiasis,
formerly dismissed as an simple infection occurring in
denture wearers, is now one of the most common
opportunistic infections in immunocompromised
patients such those undergoing chemo therapy, HIV-
infected persons and transplant recipients
[1,2]
.
There are topical and systemic antifungal agents
that may be indicated to control oral candidiasis, but,
the development of resistance is an emerging trend that
may threaten their clinical effectiveness
[1-4]
. For
millions of people that traditional medicine serves as
the only opportunity for health care, plants are vital
sources. Safety and lower side effects of many herbal
extracts have also suggested them as sources of new
pharmaceuticals
[5-8]
. History of ginger and its
applications are well documented
[9,10]
. It has been in
medical use since ancient times. Ginger is listed in
modern pharmacopoeias and repertories and has a wide
range of confirmed pharmacological properties
[11-13]
.
More recently studies have shown the antifungal
properties of ginger extract, Gingerol
[13]
.
In this study the antifungal activities of ethanolic
extract of the rhizomes of “zingiber officinale” on
Candida albicans was investigated.
MATERIALS AND METHODS
The fungi used in this study, Candida albicans
(PTCC 5027 and ATCC 10231), was purchased
from Iranian microbial collection (Tehran, Iran).
Candida albicans was cultured and maintained on
subouraud’s dextrose agar medium at 30°C. Inoculums
of yeast like fungi were prepared for disc diffusion
assays. Sterile 705 mm diameter paper discs (3M, USA)
were impregnated with 2 mg (10 µL) ethanolic plant
extract, allowed to air dry and placed face down on the
inoculated agar surface. Nystatin solution 100000U/CC
used as positive control. Discs impregnated with 10 µL
of 1% normal saline and allowed to air dry served as
negative control. Plates were then incubated at 30°C in
dark for 48 h, after which the diameter of the fungal
Am. J. Applied Sci., 6 (6): 1067-1069, 2009
1068
growth inhibition zone was measured. The well
containing the highest dilution of ginger extract that
still showed a zone of inhibition around it was
considered to be MIC
[14,15]
.
Extracts was prepared by blending approximately
500 g of the preserved plant material in 99%
ethanol (1:3 (W/V) ratio). The mixture was filtered
and the filtrate was retained and the residue was again
stored in fresh ethanol and processed as above. The
filtrates were collected and the solvent was rotary
evaporated at 45°C to near dryness, whereupon the
extract was freeze-dried for 48 h to achieve complete
dryness.
The process yielded approximately 35-45 g of
dried extract. The dried extract (200 mg) was
reconstituted in 1 mL of 99% ethanol for a final
concentration of 10 mg mL
−1
for antifungal disk assays.
Data were analyzed by ANOVA test.
RESULTS
The ginger extract was effective in inhibiting the
growth of Candida albicanse. The positive control
(Nystatin) produced significantly sized inhibition
zones with Candida albicans, while the negative
control produce no observable zones. The inhibitory
zone was measured with respect to the extract
concentration in 24 and 48 h. This assay showed that
the inhibitory zone was reduced while decreasing the
concentration (Fig. 1).
There was significant difference between the
extract and Nystatin in their inhibition activity in
comparison with Candida albicanse (p<0.01).
Minimum Inhibitory Concentration (MIC) of the ginger
extract was obtained for the concentration at 2 mg mL
−1
(1:5 dilution).
0
2
4
6
8
10
12
14
1
1/5
1/25
1/125
1/625
1/3125
1/15625
Extract dilution (mg dL)
Inhibitory zone (mm
2
)
Ginger 24 h
Ginger 48 h
Nystatin 24 h Nystatin 48 h
Fig. 1: Inhibitory zone in comparison with dilution
DISCUSSION
Members of the Zingiberaceae family are
important in traditional medicine for the treatment of
many diseases such as inflammation, morning
sickness in pregnancy and many infective diseases.
Significant antifungal activities were evident with
extracts from members of the Zingiberaceae
[16-18]
. This
study showed that the extract of rhizomes of
Z.officinale has pronounced inhibitory activities against
Candida albicans. This result is comparable with other
studies
[5,9,10,12]
suggesting that different antifungal
agents are present in the Ginger extract. In the ginger
rhizome there are several components which have
antibacterial and anti fungal effects. The gingerol and
shagelol identified as more active agents
[13]
.
Ginger extract containing Gingerol inhibits the
growth of many bacteria and fungi in vitro and the
activity might be contributed to the preventive effects
of its different agents
[13,18-21]
.
Recent studies have focused on the effect of Ginger
on the oral bacteria and fungi. Park et al. showed that
crude extract of the ginger can inhibit the growth of oral
bacteria in vitro
[23]
which is in good agreement with our
results.
CONCLUSION
Antifungal activity of the ginger extract has been
reported before
[1-13]
. Our study focused on the effect of
ginger extract on the oral species of Candida (Albicans)
and showed the significant anticandidal effect the
extract. Although species belonging to the
Zingiberaceae family are generally regarded safe for
human consumption
[22]
, further bio-assay guided
analysis and clinical trial studies are required to
approve it as an anti fungal agent for oral species. Our
results suggest the ginger components as promising
candidates for development of antifungal agents for
topical applications.
ACKNOWLEDGMENT
The researchers would like to thank the Kerman
University of Medical Sciences (vice chancellor for
research) for sponsorship of the field research (Grant
number: 83/53).
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