Detalhes bibliográficos
| Ano de defesa: |
2016 |
| Autor(a) principal: |
Frazão, Gladslene Góes Santos |
| Orientador(a): |
Silva, Gabriel Francisco da |
| Banca de defesa: |
Não Informado pela instituição |
| Tipo de documento: |
Tese
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal de Sergipe
|
| Programa de Pós-Graduação: |
Pós-Graduação em Biotecnologia (RENORBIO-SE)
|
| Departamento: |
Não Informado pela instituição
|
| País: |
Brasil
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
https://ri.ufs.br/handle/riufs/3272
|
Resumo: |
The edible coatings are defined as a thin layer of edible material usually applied in liquid form on the product by immersing the same. Several studies have shown that the addition of bioactive substances such as essential oils have increased antimicrobial packaging potential of these, contributing to the increased food shelf life. Thus, this study aimed to develop and evaluate in vitro and in situ microbiological efficiency of edible coatings to chitosan base incorporated with essential oils of Myrcia ovata Cambess (MYRO). The antimicrobial potential of 9 essential oils (EOs) was evaluated in vitro by diffusion technique in discs against foodborne bacteria (Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus cereus, Bacillus subtilis, Serratia marcescens, Escherichia coli, Enterococcus faecalis and Salmonella enteritidis). Due to greater availability of MYRO-174 and MYRO-175 oils and being gram-positive bacteria very sensitive to extremely sensitive to them, these were selected for incorporation into edible eatable coatings of chitosan base.The edible coatings formulations were prepared ranging cassava starch, chitosan and essential oil concentrations according the central composite rotational design (23 + 6 axial points and 3 central points). The bacteria were sensitive to edible coatings with diameters of inhibition zone between 9.0 -12.5 mm. The edible coatings formulations containing MYRO-175 oil were optimized for the B. Cereus and B. subtilis inhibition using the response surface methodology, a predictive mathematical model for the inhibition of them was obtained. The essential oil concentration was the more significant parameter to antimicrobial activity of coatings. The edible coatings incorporated with MYRO-174 oil or MYRO-175 (1.00% cassava starch, 1.00% chitosan and 1.25% essential oil) were applied in mangabas and the antimicrobial potential against natural microflora and Bacillus cereus artificially contaminated in the fruits was studied. The coated mangabas showed total mesophilic aerobic bacteria counts the order of 102 CFU/g, molds and yeasts <10 CFU/g (estimated value) and inhibition of growth of B. cereus for 12 days of storage at 10°C. On the other hand, uncoated mangabas (control) rotted from the 8th day of refrigerated storage. The edible coatings based in chitosan incorporated with M. ovata Cambess. EOs demonstrated potential to be used as an alternative in vitro microbiological control of foodborne bacteria and in situ on mangaba preservation. |
