lyethylene (MDPE) with various contents of three
different anti-bacterial agents was considered. Halo and
Plate-Count-Agar (PCA) methods were used. It was
found that the inhibition zones were clearly visible for
HPQM agent, the higher the HPQM content the greater
the clear zone. ZEOMIC gave no zone of inhibition. The
result of PCA suggested that after incorporating HPQM
agent in the MDPE matrix, the % reductions of E. coli
and S. aureus bacteria were extremely high (99.9%) for
all loadings while those by TROYSAN-S88 were 77.0%
for E. coli and 96.0% for S. aureus.
Keywords: Polyethylene; Anti-bacterial agents; Halo test;
Plate count agar method