has been previously isolated from Laboratory of
Microbiology Faculty of Health Sumatera Utara
University and from the result of isolation
Staphylococcus aureus is dominant bacteria.
Antimicrobial test started from bacteria rejuvenation.
The bacteria rejuvenation tarted by streaking 1-3 ose
bacteria in Nutrient Agar then incubate for 24 hours
in incubator.
Antimicrobial test was performed on the media
under the following procedures. First step is taken 3
ose from rejuvenated bacteria then put the bacteria in
test tube that contain 5-10 milimeter aquadest, and
vortex. After the vortex process, the absorbance of
suspension was measured with spectrophotometry at
wavelenght of 600 nm until the absorbance value of
0,5 is obtained. Dip the sterile cotton bud into
bacterial suspension, then streak on the surface of
Mueller Hinton Agar. Take the disc paper that has
been soaked in each concetration for 1 hour then
placed on the part that has been marked, then incubate
the petri dish in incubator for 24 hours on 37
0
C.
Table 1: The result of inhibition zone percentage
Group Concentration Contr
ol
50% 75% 100%
I 57.42 % 46.21% 98.03% 0%
II 57.42% 72.82% 98.97% 0%
III 56.02% 66.29% 88.23% 0%
IV 63.02% 66.76% 94.30% 0%
V 60.22% 66.76% 94.77% 0%
VI 55.08% 66.29% 86.36% 0%
VII 49.48% 73.76% 84.03% 0%
The inhibition zone known based on the
measurement of the clear zone diameter around disc
paper. Measurement performed with caliper.
Measurements were carried out 3 times by measuring
the largest diameter of the inhibitory zone at each
concentration. Data obtained from this experiment
was put into a table. Data processing was done with
computer and analyzed with SPSS using Kruskall-
Wallis test.
3 RESULT
The result of inhibiton zone measurement at 50%
concentration are 6.15 cm, 6.15 cm, 6 cm, 6.75 cm,
6.45 cm, 5.90 cm, and 5.30 cm. Then at 75%
concentration are 4.95 cm, 7.80 cm, 7.10 cm, 7.15 cm,
7.15 cm, 7.10 cm, and 7.90 cm. The biggest
concentration in this study is 100%. The result of the
inhibition zone measurement are 10.50 cm, 10.60 cm,
9.45 cm, 10.1 cm, 10.15 cm, 9.25 cm, and 9 cm, and
there was no inhibition zone of control group. (Table
1)
The result of inhibition zone percentage at 50%
concentration are 57.42%, 57.42%, 56.02%, 63.02%,
60.22%, 55.08%, and 49.48%. Then at 75%
concentration are 46.21%, 72.82%, 66.29%, 66.76%,
66.76%, 66.29%, and 73.76%. The inhibition zone
percentage at 100% concentration are 98.03%,
98.97%, 88.23%, 94.30%, 94.77%, 86.36%, and
84.03%. (Table 2)
The result of average measurement showed at
table 3, the smallest inhibition zone at 50%
concentration (6.08 ± 0.48 cm) and the largest
inhibition zone was found at 100% concentration
(9.47 ± 0.88 cm) and there was no inhibition zone of
control group. (Figure 1,2,3,4) The average
percentage at 50% concentration (56.95 ± 4.24%),
75% concentration (65.55 ± 9,11%), and 100% (92.09
± 5,87%). (Table 3)
Table 2: The result of the inhibition zone measurement
Table 3: The average measurement and percentage of
inhibition zone.
Concentration Inhibition
Zone
Percentage
of Inhibition
Zone
p-
value
Mean±SD
(cm)
Mean±SD
(%)
50% 6.08±0.48 56.95±4.24 0.000
75% 6.65±1.07 65.55±9.11
100% 9.47±0.88 92.09±5.87
Control 0 0
Group Concentration Contr
ol
50% 75% 100%
I 6.15 cm 4.95 cm 10.05
cm
0 cm
II 6.15 cm 7.80 cm 10.60
cm
0 cm
III 6.00 cm 7.10 cm 9.45 cm 0 cm
IV 6.75 cm 7.15 cm 10.10
cm
0 cm
V 6.45 cm 7.15 cm 10.15
cm
0 cm
VI 5.90 cm 7.10 cm 9.25 cm 0 cm
VII 5.30 cm 7.90 cm 9.00 cm 0 cm