of gram-positive bacteria. This is consistent with the
explanation Suwito (2010), that gram-negative
bacteria have a cell wall that consists of three layers.
With a more complex structure of gram-negative
bacteria according to Harijani (2009), making
antibiotic compounds more difficult to enter the cell.
In addition to the effect of shelf life, the decrease in
inhibition is also due to other factors such as type,
age, antimicrobial concentration, microbial state,
and physicochemical properties such as pH, water
content (Siswadi, 2002). A graph of the decrease in
the inhibition zone diameter of methanol extract of
Moringa oleiferaleaves is shown in Figure 2.
Figure 2: Inhibition zone of Eschrichia coli.
Compounds contained in Moringa leaf extracts
such as flavonoids, saponins, and tannins have a
function in damaging cell walls in bacteria. This is
in accordance with the opinion of Khasanah, etc.
(2014) Cell walls are the main target of being
attacked by antibacterial substances contained in the
Methanol extract of Moringa leaves, making it easier
for tannins, saponins and flavonoids to enter the cell
membrane. Cell walls are not selectively permeable
so that these compounds are easily penetrated
through the cell wall which will cause disruption of
the integrity of the bacterial cell wall. The ability of
flavonoids as an antibacterial is able to stick to
bacterial cell walls and disrupt bacterial membranes,
so bacteria become lysis and die. The ability of
flavonoids to provide antibacterial effects includes
inhibiting the function of cytoplasmic membranes,
inhibiting nucleic acid synthesis, and inhibiting
antibacterial activity by inhibiting energy
metabolism, flavonoids inhibit oxygen consumption
by interfering with the electron transport chain
respiration. Permatasari, et al (2013) added that
Saponin is included in the antibacterial group which
interferes with the permeability of microbial cell
membranes. Causing damage to cell membranes and
causing the release of various important components
from the microbial cells, namely proteins, nucleic
acids, nucleotides, and others.
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