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

Table 5

Inhibition zone diameters obtained with Lippia  graveolens H.B.K. and Origanum  vulgare L. essential oils at 15% and 25% (w/v) concentration against test organisms.

Microorganism	Concentration of essential oil (%)	MXO; essential oil; (mm)	Microencapsulated; MXO; essential oil; (mm)	EUO; essential oil; (mm)	Microencapsulated; EUO; essential oil; (mm)
Salmonella sp.	15	26.35^aB  ± 0.84	0^cB	24.96^bB  ± 0.06	0^cA
	25	29.23^aA  ± 0.18	24.85^cA  ± 0.26	27.88^bA  ± 0.16	0^dA
Brochothrix thermosphacta	15	0^bA	24.43^aA  ± 0.21	0^bB	0^bB
	25	0^bA	24.82^aA  ± 0.14	24.96^aA  ± 0.02	24.58^aA  ± 0.33
Pseudomonas fragi	15	24.95^aA  ± 0.01	24.82^bA  ± 0.10	0^cB	0^cB
	25	24.92^aB  ± 0.01	24.91^aA  ± 0.35	24.93^aA  ± 0.03	24.67^aA  ± 0.25
Lactobacillus plantarum	15	24.87^aB  ± 0.02	24.93^aA  ± 0.21	0^bA	0^bA
	25	24.94^aA  ± 0.01	25.02^aA  ± 0.23	0^bA	0^bA
Micrococcus luteus	15	67.69^aB  ± 0.19	32.27^bB  ± 0.48	27.12^cB  ± 1.28	24.93^dB  ± 0.18
	25	83.08^aA  ± 0.09	43.58^cA  ± 0.08	75.19^bA  ± 0.10	28.33^dA  ± 0.81

a–d: for each test microorganism, means within a row not having a common superscript letter are different .
A and B: for each test microorganism, means within a column (between concentrations) not having a common superscript letter are different .