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Preparation and evaluation of poly lactic acid antioxidant packaging films containing thyme, rosemary and oregano essential oils.
Protecting foods from oxidation for appreciable amounts of time is becoming a major challenge for the food industry. Lipid containing foods are the most susceptible types of food to oxidation. In the present research study, thyme, rosemary and oregano essential oils were incorporated into PLA to gen...
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2015
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| _version_ | 1867613408036126720 |
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| access_status_str | Open Access |
| author | Zeid, Amr Mostafa |
| author_browse | Zeid, Amr Mostafa |
| author_facet | Zeid, Amr Mostafa |
| author_sort | Zeid, Amr Mostafa |
| collection | Thesis |
| dc_rights_str_mv | The author retains all rights with regard to copyright. The author certifies that written permission from the owner(s) of third-party copyrighted matter included in the thesis, dissertation, paper, or record of study has been obtained. The author further certifies that IRB approval has been obtained for this thesis, or that IRB approval is not necessary for this thesis. Insofar as this thesis, dissertation, paper, or record of study is an educational record as defined in the Family Educational Rights and Privacy Act (FERPA) (20 USC 1232g), the author has granted consent to disclosure of it to anyone who requests a copy. |
| description | Protecting foods from oxidation for appreciable amounts of time is becoming a major challenge for the food industry. Lipid containing foods are the most susceptible types of food to oxidation. In the present research study, thyme, rosemary and oregano essential oils were incorporated into PLA to generate antioxidant active packaging films based on the antioxidant activity of the used essential oils. Antioxidant activity of pure essential oils as well as film extracts were assessed by the DPPH method to ensure their efficiency. The antioxidant effect of prepared active films was also evaluated in contact with minced trout fish meat by using the TBA method. Mechanical properties, oxygen permeability and migration properties of the films were tested. Thyme essential oil showed a Radical Scavenging Activity (RSA) of 84.57% in the DPPH test, while rosemary and oregano had a RSA of 87.92% and 87.73% respectively at 10000 ppm concentration. Antioxidant activity of methanol extracts from thyme, rosemary and oregano films were between 4% and 6% lower than that shown by pure essential oils at the same concentration. TBA test results showed a decrease in degree of oxidation of minced fish packaged in thyme active film by 10.8% as compared to that packaged in control film. While Rosemary active film reduced oxidation by 20.3%. Oregano active film caused the highest decrease in oxidation by 47.9%. PLA films prepared by the solvent casting method containing thyme, rosemary or oregano essential oils may be used as antioxidant active packaging materials. |
| format | Thesis |
| id | oai:fount.aucegypt.edu:etds-1152 |
| institution | American University in Cairo (Egypt) |
| last_indexed | 2026-06-10T12:35:39.635Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from AUC Knowledge Fountain — bepress |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | AUC Knowledge Fountain |
| publisherStr | AUC Knowledge Fountain |
| record_format | dspace |
| source_str | AUC Knowledge Fountain — bepress |
| spelling | oai:fount.aucegypt.edu:etds-1152 Preparation and evaluation of poly lactic acid antioxidant packaging films containing thyme, rosemary and oregano essential oils. Zeid, Amr Mostafa Protecting foods from oxidation for appreciable amounts of time is becoming a major challenge for the food industry. Lipid containing foods are the most susceptible types of food to oxidation. In the present research study, thyme, rosemary and oregano essential oils were incorporated into PLA to generate antioxidant active packaging films based on the antioxidant activity of the used essential oils. Antioxidant activity of pure essential oils as well as film extracts were assessed by the DPPH method to ensure their efficiency. The antioxidant effect of prepared active films was also evaluated in contact with minced trout fish meat by using the TBA method. Mechanical properties, oxygen permeability and migration properties of the films were tested. Thyme essential oil showed a Radical Scavenging Activity (RSA) of 84.57% in the DPPH test, while rosemary and oregano had a RSA of 87.92% and 87.73% respectively at 10000 ppm concentration. Antioxidant activity of methanol extracts from thyme, rosemary and oregano films were between 4% and 6% lower than that shown by pure essential oils at the same concentration. TBA test results showed a decrease in degree of oxidation of minced fish packaged in thyme active film by 10.8% as compared to that packaged in control film. While Rosemary active film reduced oxidation by 20.3%. Oregano active film caused the highest decrease in oxidation by 47.9%. PLA films prepared by the solvent casting method containing thyme, rosemary or oregano essential oils may be used as antioxidant active packaging materials. 2015-06-01T07:00:00Z thesis application/pdf https://fount.aucegypt.edu/etds/153 https://fount.aucegypt.edu/context/etds/article/1152/viewcontent/Final_20Thesis_20PDF.pdf The author retains all rights with regard to copyright. The author certifies that written permission from the owner(s) of third-party copyrighted matter included in the thesis, dissertation, paper, or record of study has been obtained. The author further certifies that IRB approval has been obtained for this thesis, or that IRB approval is not necessary for this thesis. Insofar as this thesis, dissertation, paper, or record of study is an educational record as defined in the Family Educational Rights and Privacy Act (FERPA) (20 USC 1232g), the author has granted consent to disclosure of it to anyone who requests a copy. Theses and Dissertations AUC Knowledge Fountain Antioxidant packaging |
| spellingShingle | Antioxidant packaging Zeid, Amr Mostafa Preparation and evaluation of poly lactic acid antioxidant packaging films containing thyme, rosemary and oregano essential oils. |
| title | Preparation and evaluation of poly lactic acid antioxidant packaging films containing thyme, rosemary and oregano essential oils. |
| title_full | Preparation and evaluation of poly lactic acid antioxidant packaging films containing thyme, rosemary and oregano essential oils. |
| title_fullStr | Preparation and evaluation of poly lactic acid antioxidant packaging films containing thyme, rosemary and oregano essential oils. |
| title_full_unstemmed | Preparation and evaluation of poly lactic acid antioxidant packaging films containing thyme, rosemary and oregano essential oils. |
| title_short | Preparation and evaluation of poly lactic acid antioxidant packaging films containing thyme, rosemary and oregano essential oils. |
| title_sort | preparation and evaluation of poly lactic acid antioxidant packaging films containing thyme rosemary and oregano essential oils |
| topic | Antioxidant packaging |
| url | https://fount.aucegypt.edu/etds/153 https://fount.aucegypt.edu/context/etds/article/1152/viewcontent/Final_20Thesis_20PDF.pdf |
| work_keys_str_mv | AT zeidamrmostafa preparationandevaluationofpolylacticacidantioxidantpackagingfilmscontainingthymerosemaryandoreganoessentialoils |