Antioxidants activity analysis. Aspergillus spp. extract was solved in methanol in various concentrations (400,
800,1600 and 3200 µg/mL). About two mL of each sample was put into a vial. Then, each vial was added with 3.8
mL DPPH 50 µM. These mixtures homogenized and put in a dark room for 30 minutes. The absorbancy level was
measured in
λ
515 nm with a spectrophotometer UV-Vis. EC
50
and counted from the percentage of absorbancy
inhibition from those various extracts a with linier regresion [8].
RESULTS AND DISCUSSION Figure 1 showed the yield of mold extracts from 12 samples of
Aspergillus spp. cultured in Malt Yeast
Pepton Glucosa (MYPG) medium. Each
Aspergillus spp. culture has different capability in producing the
antioxidants component. The various levels of the antioxidants yield range from 1.47. – 3.80 %, the lowest was
A. phoenicus UICC 13 (1.47%) and the highest was
A .
niger UICC 371 (3.80%).
The yield was counted to measure the effectivity of solvent in extracting antioxidants component. The level of
extracted yield was possibly caused by semi polar characteristic of ethyl acetate. Thus, could extract glycone
(polar/glucose-binded) and non-polar aglycone component (non-polar/glucose-free) which has a higher
antioxidants activity than the glycone component [9].
TLC analysis was used with silica gel F
254
plate. TLC analysis is a qualitative analysis method to examine the
antioxidants contained in 12 samples of
Aspergillus spp. by measuring the Rf value. [10]. The Rf value for each
sample of
Aspergillus spp. was shown in Fig. 2.
The samples of
Aspergillus spp. with an Rf value similar with Butylated Hydroxy Toluene (BHT) antioxidants
sintesis as a standard showed that sample extraction of
Aspergillus spp. with ethyl acetate was antioxidants
compound, while the ones which have lower or higher Rf values possibly contained another compound since this
study involved various
Aspergillus spp. Hanani
et al. (2005) [12] reported that in determining the existence of an
antioxidants in
Callyspongia sp. extract with TLC, the result should show the same Rf value as the standard.
Figure 3 showed the highest percentage of BHT found in
A. awamori UICC 9 (0.05) and the lowest was found in
A. ficuum UICC 41 (0.004). The percentage of BHT in the material was less than in the extracts. This was due to the
material which was not purified. Thus, the antioxidants were not decomposed in the ethyl acetate solvent.