Carvacrol encapsulation into nanostructures: Characterization and antimicrobial activity against foodborne pathogens adhered to stainless steel

被引:39
|
作者
Cacciatore, Fabiola Ayres [1 ]
Dalmas, Michelle [1 ]
Maders, Caroline [1 ]
Isaia, Henrique Ataide [2 ]
Brandelli, Adriano [2 ]
Malheiros, Patricia da Silva [1 ]
机构
[1] Univ Fed Rio Grande do Sul, Inst Ciencias & Tecnol Alimentos, Dept Ciencia Alimentos, Lab Higiene Alimentos, BR-91501970 Porto Alegre, RS, Brazil
[2] Univ Fed Rio Grande do Sul, Inst Ciencias & Tecnol Alimentos, Dept Ciencia Alimentos, Lab Bioquim & Microbiol Aplicada, BR-91501970 Porto Alegre, RS, Brazil
关键词
Nanotechnology; Natural antimicrobials; Foodborne pathogens; Stainless steel; IN-VITRO EVALUATION; ESSENTIAL OILS; LISTERIA-MONOCYTOGENES; ESCHERICHIA-COLI; STAPHYLOCOCCUS-AUREUS; PHYSICOCHEMICAL CHARACTERIZATION; ANTIBACTERIAL ACTIVITY; BIOFILM FORMATION; MAIN COMPONENTS; SALMONELLA;
D O I
10.1016/j.foodres.2020.109143
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
Carvacrol is a natural antimicrobial capable of inhibiting several microorganisms. The encapsulation of this compound may increase its stability, water solubility and provide controlled release. In this study, carvacrol encapsulated into nanoliposomes (NLC) and polymeric Eudragit (R) nanocapsules (NCC) was tested against Staphylococcus aureus, Listeria monocytogenes, Escherichia coli and Salmonella spp. adhered to stainless steel. NLC showed an average diameter of 270.8 nm, zeta potential of +8.64 mV, and encapsulation efficiency of 98%. Minimum Bactericidal Concentration (MBC) of NLC was 3.53 mg/mL against Salmonella and 5.30 mg/mL against the other bacteria. NCC presented an average diameter of 159.3 nm, zeta potential of +44.8 mV, and encapsulation efficiency of 97%. MBC of NCC was 4.42 mg/mL against E. coli and 3.31 mg/mL against the other bacteria. After 2 h incubation with NCC at carvacrol concentration equivalent to 1/2 MBC, viable counts of Salmonella and E. coli were below the detection limit (1.69 CFU/mL). The population of L. monocytogenes and S. aureus was reduced by 2 log CFU/mL in 6 h. Afterwards, pools of each bacterium were separately adhered to stainless steel coupons (initial population 6.5 CFU/cm(2)). Salmonella and E. coli were inhibited below the detection limit using the NCC at concentration equivalent to MBC, while L. monocytogenes and S. aureus were reduced by 4 log CFU/cm(2) and 3.5 log CFU/cm(2), respectively. Although free carvacrol presented better results than encapsulated one in all tests performed, using encapsulated carvacrol could be more interesting for food applications by masking the strong aroma of the compound, in addition to a controlled release of carvacrol. The results suggest that NCC have potential for use in food contact surfaces in order to avoid bacterial adhesion and subsequent biofilm formation.
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页数:9
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