Table 3.

Antibacterial activity expressed as inhibition zone (mm ± S.D.) and MICs (in μM/mL, given in brackets) of AgNPs reduced with cellulosic polymers compared with PEG and AgNPs prepared using tri-sodium citrate. A: AgNPs-PEG; B: AgNPs-EC; C: AgNPs-MC; D: AgNPs-HPMC; E: AgNPs-citrate. (‒), not determined as the previous concentration showed zero activity.

Sample type Bacterial strains	A	B	C	D	E
Bacillus cereus	–	6 ± 0.1	6 ± 0.3	10 ± 0.5	6 ± 0.8
		(10.65)	(170. 5)	(85. 25)	(1000)
Bacillus subtilis	–	8 ± 0.3	6 ± 0.1	10 ± 0.6	9 ± 1.0
		(21.31)	(341)	(85. 25)	(1000)
Escherichia coli	–	8 ± 0.2	6 ± 0.2	6 ± 0.4	7 ± 0.5
		(21.31)	(170. 5)	(42.62)	(1000)
Micrococcus luteus	6 ± 0.2	8 ± 0.2	8 ± 0.2	11 ± 0.7	8 ± 0.4
	(1000)	(21.31)	(341)	(85. 25)	(1000)
Pseudomonas aeruginosa		9 ± 0.1	–	12 ± 0.9	7 ± 0.3
	–	(21.31)		(85. 25)	(1000)
Salmonella typhimurium		10 ± 0.3	6 ± 0.3	6 ± 0.7	6 ± 0.5
	–	(21.31)	(42.62)	(10.65)	(1000)
Serratia marcescens		10 ± 0.2	6 ± 0.4	6 ± 0.5	15 ± 0.9
	–	(21.31)	(42.62)	(21.31)	(1000)
Staphylococcus aureus	6 ± 0.1	6 ± 0.4	8 ± 0.6	8 ± 0.9	7 ± 0.8
	(1000)	(21.31)	(341)	(85. 25)	(1000)