Table 1.
Antimicrobial spectra of the RX7 bacteriocin.
| Indicator organism | Media | Inhibition |
|---|---|---|
| zone (mm)∗ | ||
| Gram-positive | ||
| Bacillus cereus KCTC 1661 | LB | ++ |
| Bacillus licheniformis KCCM 12145 | NB | ++ |
| Enterococcus faecalis (VRE) CCARM 0011 | NB | ++ |
| Listeria monocytogenes ATCC 19114 | TSB | +++ |
| Streptococcus agalactiae ATCC 13813 | TSB | ++ |
| Staphylococcus aureus KFRI 00188 | NB | ++ |
| Staphylococcus aureus subsp. aureus (MRSA) KCCM 40510 | NB | + |
| Streptococcus mutans ATCC 25175 | BHI | + |
| Lactobacillus acidophilus KCCM 32820 | MRS | + |
| Lactobacillus delbrueckii KCCM 11357 | MRS | + |
| Lactobacillus johnsonii PF01 (our isolate) | MRS | + |
| Lactobacillus salivarius CPM7 (our isolate) | MRS | + |
| Lactobacillus plantarum KCCM 11322 | MRS | + |
|
| ||
| Gram-negative | ||
| Escherichia coli K88 | LB | ++ |
| Klebsiella pneumoniae subsp. pneumoniae KCCM 11418 | NB | + |
| Pseudomonas aeruginosa KCCM 11266 | NB | ++ |
| Pseudomonas aeruginosa CCARM 2003 | LB | ++ |
| Shigella flexneri KCCM 40414 | NB | ++ |
| Salmonella enteritidis KCCM 12021 | NB | ++ |
| Salmonella enteritidis KVCC-BA0700654 | NB | ++ |
| Salmonella gallinarum KVCC-BA0700722 | NB | ++ |
| Salmonella pullorum KVCC-BA0702509 | NB | + |
| Salmonella typhimurium KCCM 40253 | NB | ++ |
|
| ||
| Fungi | ||
| Candida albicans KCTC 7122 | PDA | ++ |
ATCC: American Type Culture Collection; CCARM: Culture Collection of Antimicrobial Resistant Microbes; KFRI: Kerala Forest Research Institute; KCCM: Korean Culture Center of Microorganisms; KCTC: Korean Collection for Type Culture.
TSB: tryptic soy broth; NB: nutrient broth; LB: Luria-bertani; BHI: brain heart infusion; MRS: de Man Rogosa and Sharpe.
∗Activity is expressed as the diameter of the inhibition zone around the well: +, less than 10 mm; ++, less than 20 mm; +++, less than 30 mm.