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