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Efeito dos materiais de parede sobre a atividade antimicrobiana da nisina encapsulada em spray-dryer em relação ao Staphylococcus aureus
| Content Provider | Semantic Scholar |
|---|---|
| Author | Oliveira, Carolina Borges De |
| Copyright Year | 2015 |
| Abstract | The use of nisin as an antimicrobial agent is permitted in the food industry in several countries, including Brazil where its use in cheese is regulated. The use of nisin in other foods presents some problems as the reduction of its antimicrobial activity when in contact with these components. One way to prevent the reduction of antimicrobial activity of nisin is associate it with encapsulating agents that can prevent or delay this interaction with food components, so preserving the antimicrobial potential. The aim of this study was to evaluate the influence of encapsulating agents maltodextrin and carboxymethylcellulose on the antimicrobial activity of nisin against Staphylococcus aureus in different concentrations and different combinations between them, resulting in six samples. The samples obtained by the spray drying method showed performance between 44.63 and 64.59%, with the best values obtained when the maltodextrin was used as a single encapsulating agent or then associated with carboxymethylcellulose, and the water activity of all samples it was below 0.37, reflecting a low water availability for the action of micro-organisms or chemical reactions. The greatest antimicrobial activity, compared with the commercial nisin, was obtained by using carboxymethylcellulose as a only encapsulating agent in a ratio of 1/0.80 of nisin/encapsulating agent, resulting in 82.64% this activity, and this was sample had lower yield. In conclusion, given the results that indicate the type and amount of encapsulating agent influence on yield and antimicrobial activity of nisin; the best condition for the encapsulation was employed in sample D, which was used ratio nisin/encapsulating agent of 1/50, with the encapsulating agent being a mixture of maltodextrin with carboxymethylcellulose in the ratio of 49 and 1, respectively, and showed yield of 63.89%, antimicrobial activity of 65.38%, water activity of 0.281 and capsulated structures in micrographs. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://acervodigital.ufpr.br/bitstream/handle/1884/40988/R%20-%20D%20-%20CAROLINA%20BORGES%20DE%20OLIVEIRA.pdf?isAllowed=y&sequence=2 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
