Microencapsulation, Chemical Characterization, and Antimicrobial Activity of Mexican (Lippia graveolens H.B.K.) and European (Origanum vulgare L.) Oregano Essential Oils

Table 3

Free and microencapsulated thymol and carvacrol antimicrobial activity against Micrococcus  luteus determined by the broth dilution method. After 2 hrs incubation at 30°C.

Antimicrobial compound	Concentration (µg/mL)	Form
		Free (log CFU/mL)	Microencapsulated (log CFU/mL)
Thymol	0	5.51^Aa  ± 0.12	5.52^Aa  ± 0.03
	50	4.17^Bb  ± 0.11	5.44^Aa  ± 0.11
	150	3.67^Ca  ± 0.18	1.70^Bb  ± 0
	250	3.58^Ca  ± 0.12	1.70^Bb  ± 0
Carvacrol	0	5.51^Aa  ± 0.12	5.52^Aa  ± 0.03
	80	5.49^Aa  ± 0.08	4.46^Bb  ± 0.15
	100	5.33^Aa  ± 0.30	1.70^Cb  ± 0
	300	5.22^Aa  ± 0.24	1.70^Cb  ± 0
	500	3.34^Ba  ± 0.24	1.70^Cb  ± 0

Different capital superscript letters indicate significant difference within a column, whereas different lowercase superscript letters indicate significant difference within rows.