Table 4.

Concentration of selected peptides in bacterial cell culture broths.

Species	Quorum sensing peptide (sequence)	Strain	Concentration	Detection method
Enterococcus faecalis	cAM373 (AIFILAS)	E. faecalis JH2-2 (pAM351)	4.4 μg/16 L = 374 pM	HPLC-UV/VIS (Mori et al., 1986a)
	iPD1 (ALILTLVS)	E. faecalis JH2-2 (pAM351)	6.3 μg/20 L = 378 pM	HPLC-UV/VIS (Mori et al., 1987)
	iCF10 (AITLIFI)	E. faecalis OG1RF(pMSP5011)	15,360 pg/mL = 19,440 pM	Estimated via bio-assay via comparing with synthetic peptide (La Rosa et al., 2015)
	cOB1 (VAVLVLGA)	E. faecalis FA2-2	1.5 μg/15 L = 135 pM	HPLC-UV/VIS (Nakayama et al., 1995a)
	cAD1 (LFSLVLAG)	E. faecalis JH2-2	200 μg/300 L = 814 pM	HPLC-UV/VIS (Mori et al., 1984)
	iAD1 (LFVVTLVG)	E. faecalis FA2-2 (pAM727)	20 μg/20 L = 787 pM	HPLC-UV/VIS (Mori et al., 1986b)
	cCF10 (LVTLVFV)	E. faecalis FA2-2 (pAM351)	4.1 μg/60 L = 86 pM	HPLC-UV/VIS (concentration) FAB-MS (amino acid sequence confirmation) (Mori et al., 1988)
	iAM373 (SIFTLVA)	E. faecalisJSS2 (pAM377)	3 μg/8 L = 500 pM	HPLC-UV/VIS (Nakayama et al., 1995b)