Table 1. Tentative identification of VOCs released in vitro by the eight bacterial strains tested.

VOCs are listed according to their retention times.

Tentative identification	Ret time (min)	Bee	Bes	Cke	Cks	Dne	Dns	Mle	Mls	Sce	Scs	Ske	Sks	See	Ses	Swe	Sws
Carbon dioxidea	2,43	+++	++	+	+	+++	+++	+++	++	+++	+++	+++	+++	++	++	+++	+++
Methanethiola	3,15		+	+	+									+
*Acetonea	3,82					+		+	++
*Hexanea	5,76			+				+		+
Trichloromethanea	6,30			+				+		+
**1-Butanola	7,44	+		+													++
Methyl-thioacetatea	8,81		+	+	+									+
*Disulfide, dimethyla	10,80	+	++	+	++	+		+	+					+		+	+
*Toluenea	11,72	+											+		+		+
*Butanoic acid, 2-methyl-methyl estera	11,96																+
S-methyl-propanethioatea	12,98		+	+	+
**Butanoic acid-3-methyla	14,20						+					+	+		+
**Butanoic acid-2-methyla	14,71														+
Acetic acid, 3-methylbutyl estera	16,72													+	++
2-Heptanonea	17,50					+	+	+	+
Butanethioic acid-S-methyl estera	17,55			+	+
Unknown-1	17,94				+
Thiopivalic acida	20,34		+											+
*Phenola	22,05	+	+	+	+			+	+					+
Trisulfide, dimethyla	22,39		+	+	+			+	+					+
Unknown-2	25,15							+
Benzeneacetaldehydea	26,03									+	+	+		+	+	+
1-Octanola	26,96			+	+
Hexanethioic acid, S-methyl estera	28,40				+
*Phenylethyl alcohola	29,67			+	+	+	+	+	+				+	+	+
Benzylmethyl cetonea	30,47	+	+						+
Sulfide-1	30,69				+
Benzeneethanol-a-methyla	30,72		+
Nonanonea	31,55							+	+
Alcohol-1	32,13				+
Tetrasulfide, dimethyla	35,51				+
Undecanonea	36,51							+	+
1-Decanola	37,11	+		+	+			+
*Indolea	38,79	+	+	+++	++	+	+	++	+	++	+	+	+	+++	+	+	+
Cyclopentaneundecanoic acid, methyl estera	39,54									+
Aromatic-1	41,48										+
1-Undecanola	41,75				+
Benzyl cetone unknown	41,79	+	+
Alcohol-2	45,68				+
Alcohol-3	46,19			+	+
Alcohol-4	46,73				+
Cetone-4	47,19			+	+
Tetradecanonea	54,30			+
Aromatic with nitrogen	55,24			+	+
*Hexadecanoic acid, methyl estera	56,48				+				+
Methyl ester-1	62,19				+				+

^a = Compounds identified based on comparison of mass spectra with NIST14 Mass Spectral Library and analysis of their EI fragmentation partners.

* = VOCs reported as emanations from human skin by Bernier et al. (2000) [7].

** = VOCs reported as released by bacteria isolated from human skin by Verhulst et al. (2009) [8]. Ret time (min) = Retention time in minutes.

Average area percentage for each sample is represented as +++. High intensity: 50–100%, ++; medium intensity: 20–50%, +; low intensity: 0.01–20%. Be_e = B. epidermidis exponential phase, Be_s = B. epidermidis stationary phase, Ck_e = C. koseri 6P exponential phase, Ck_s = C. koseri 6P stationary phase, Dn_e = D. nishinomiyaensis 9C exponential phase, Dn_s = D. nishinomiyaensis 9C stationary phase, Ml_e = M. luteus 23 exponential phase, Ml_s = M. luteus 23 stationary phase, Sc_e = S. capitis 11C exponential phase, Sc_s = S. capitis 11C stationary phase, Sk_e = S. caprae 7P exponential phase, Sk_s = S. caprae 7P stationary phase, Se_e = S. epidermidis exponential phase, Se_s = S. epidermidis stationary phase, Sw_e = S. warneri exponential phase, Sw_s = S. warneri stationary phase.