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Table 3 Antimicrobial activity of Nigrocin-PN and its derivatives against planktonic cells of gram-positive and gram-negative strains, as well as C. albicans

From: A novel antimicrobial peptide found in Pelophylax nigromaculatus

Bacterial strains

Nigrocin-PN (MIC/MBC) (µM)

Nigrocin-M1 (MIC/MBC) (µM)

Nigrocin-M2 (MIC/MBC) (µM)

S. aureus (NCTC 10,788)

4/8

4/8

512/512

S. aureus (ATCC 25,923)

16/64

16/32

512/ > 512

E. coli (NCTC 10,418)

8/8

8/16

128/128

C. albicans (NYCY 1467)

32/128

32/128

 > 512/ > 512

E. faecalis (NCTC 12,697)

8/8

 > 512/ > 512

 > 512/ > 512

MRSA (NCTC 12,493)

16/16

16/16

 > 512/ > 512

MRSA (B038 V1S1A)

32/64

8/32

 > 512/ > 512

MRSA (B042 V2E1A)

32/64

16/32

 > 512/ > 512

S. constellatus (B003 VISIT)

8/8

4/4

256/256

K. pneumoniae (ATCC 43,816)

16/32

16/16

256/256

K. pneumoniae (ATCC 13,883)

16/64

8/32

512/ > 512

P. aeruginosa (ATCC 27,853)

64/64

512/512

512/ > 512

P. aeruginosa (ATCC 9097)

64/128

256/512

512/ > 512

P. aeruginosa (B004 V2S2B)

16/32

 > 512/ > 512

 > 512/ > 512