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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 丁俞文 | |
dc.contributor.author | Yu-Ying Su | en |
dc.contributor.author | 蘇昱穎 | zh_TW |
dc.date.accessioned | 2021-07-09T15:53:44Z | - |
dc.date.available | 2022-06-30 | |
dc.date.copyright | 2019-08-01 | |
dc.date.issued | 2019 | |
dc.date.submitted | 2019-07-26 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76523 | - |
dc.description.abstract | 抗菌包裝能減緩食品腐敗以延長貨架期及減少食品中毒風險,將奈米技術應用於抗菌包材可提高成品機械強度,並提升單位體積下反應表面積,使活性物質作用效果更迅速。靜電紡絲是一種新興生產奈米纖維之技術,生產程序簡單且為非熱加工,有效提升活性物質之包覆效率,從而增加其適用性。植物合成之精油,因有許多正面功效而被廣泛運用於製藥及食品領域,D-檸檬烯是柑橘精油主成分,具抗菌,抗氧化和抗癌活性,然而,檸檬烯的使用受其本身高度揮發性而受限制,且暴露於空氣後會迅速氧化。因此,運用具減緩物質揮發性及氧化性之β-環狀糊精(βCD)以改善,βCD具前述優點是因其可將疏水性化合物包埋到內腔。
本研究以βCD作為包覆檸檬烯的核心材料,聚乙烯醇(PVA)用於形成纖維基質。為了生產具有最佳性能的纖維,研究了包括電壓,流速,收集距離在內的操作參數。掃描電子顯微鏡(SEM)用於研究形態和直徑。熱重分析(TGA)用於檢測熱穩定性。ISO 20743評估薄膜對大腸桿菌及金黃色葡萄球菌之抗菌能力。X-光繞射儀(XRD)用於觀測βCD是否為有效包埋活性物質的通道型。最後,使用氣相層析火焰離子化偵檢器(GC-FID)分析承載效率。在SEM觀察中,優化纖維的表面是光滑且其直徑約180 nm,這表明大的表面積與體積比。於TGA結果,游離檸檬烯於環境溫度下開始釋放並在160℃釋放完畢,而固定在PVA膜內的檸檬烯/βCD複合物則顯示116°C~180°C都有檸檬烯質量損失,這表明包埋後檸檬烯熱穩定性顯著增加。XRD結果確認成品中的βCD為有效包埋物質的通道型。檸檬烯承載效率約為93%。 PVA /檸檬烯/βCD 奈米薄膜對大腸桿菌及金黃色葡萄球菌的抗菌能力為95.23%及97.84%。總結,新開發的PVA/檸檬烯/βCD 具有高的承載效率、穩定性及抗菌活性,具有應用於食品包裝和生物醫學領域的潛力。 | zh_TW |
dc.description.abstract | Active packaging used to eliminate food born spoilage has been a promising investigation in the field of food packaging. D-limonene, a main component of citrus essential oil, was reported to have antimicrobial, antioxidant and anticarcinogenic Activity. However, the use of limonene is constrained due to their highly volatile nature and would be rapidly oxidized when exposed to air. Hence, β-cyclodextrin with ability of entrapping hydrophobic compound into its inner cavity was used to improve aqueous solubility and stability of essential oil. Recently, nanotechnology that is capable of improving mechanical strength and exhibiting a larger surface to volume ratio has been applied to upgrade efficacy of active packaging system. Among various approaches to produce nanomaterials, electrospinning is an emerging technique with simple operating process and high encapsulation efficiency could be used to fix substances into fiber mat increasing its applicability. In this work, β-cyclodextrin(βCD) was used as core material to encapsulate limonene. Additionally, 8 wt% polyvinyl alcohol(PVA) was used to form fiber matrix. To produce fiber mat with optimum properties, operation parameter including voltage, flow speed, collection distance was researched. Scanning electron microscopy(SEM) was used to study morphology and diameter. Thermogravimetric analysis(TGA) was used to detect the thermal stability. The crystalline structure of fiber mat was recorded by X-Ray powder Diffraction(XRD). Antibacterial ability was accessed by ISO 20743 against E. coli and S.aureus. Finally, the loading efficiency were analyzed using gas chromatography - flame ionization detector(GC-FID). In SEM observation, the surface of the optimized fiber was smooth and its diameter was around 180 nm indicating a large surface area to volume ratio. From the TGA result, it shows release of free-form limonene started at ambient temperature and reached its maximum rate at 160°C, whereas limonene/β-CD complexes fixed within the PVA membrane show limonene mass lost at 116°C~180°C. This phenomenon indicated a significant increase of limonene stability after being encapsulated. Through XRD result, the present of inclusion between βCD and limonene can be confirmed. The loading efficiency of limonene was around 93%. PVA/ limonene/βCD nanaofibers exhibited 97.84% and 95.23% antibacterial ability against S.aureus and E.coli. In conclusion, newly developed PVA/ limonene/βCD with high loading efficiency, antibacterial activity may have great potentials for applications in food packaging and biomedical field. | en |
dc.description.provenance | Made available in DSpace on 2021-07-09T15:53:44Z (GMT). No. of bitstreams: 1 ntu-108-R06641021-1.pdf: 4149686 bytes, checksum: 97bc179c40de34bf8eb35beb002e2a4b (MD5) Previous issue date: 2019 | en |
dc.description.tableofcontents | 謝誌 I
摘要 II Abstract III 目 錄 V 圖目錄 VIII 表目錄 X 第一章、前言 1 第二章 文獻回顧 2 2.1 奈米科技 2 2.2食品包裝 3 2.2.1包裝目標及趨勢 3 2.2.2 奈米科技於活性包裝應用 4 2.2.3 抑菌食品包材 6 2.3靜電紡絲 9 2.3.1 靜電紡絲原理及優點 10 2.3.2 靜電紡絲參數 13 2.3.3靜電紡絲應用 19 2.3.4聚乙烯醇於靜電紡絲之應用 19 2.3.5 具抗菌性之聚合物於靜電紡絲之應用 20 2.3.6環狀糊精包埋精油於靜電紡絲之應用 21 2.4檸檬烯性質 23 2.4.1檸檬烯之抗癌性 24 2.4.2檸檬烯之抗菌性 24 第三章、研究目的與實驗架構 27 3.1研究目的 27 3.2 實驗架構 27 第四章、材料與方法 29 4.1材料 29 4.2儀器 30 4.3 實驗方法 31 4.3.1 靜電纺絲溶液設計 31 4.3.2 靜電紡絲操作參數設定 31 4.3.3 靜電紡絲溶液配置 32 4.3.4 電紡溶液之黏度測定 32 4.3.5 電紡溶液之導電度測定 32 4.3.6 靜電紡絲過程 33 4.3.7 電紡絲膜之表徵觀察 33 4.3.8樣品結晶分析 33 4.3.9 樣品熱重分析 34 4.3.10 檸檬烯承載效率分析 34 4.3.11 靜電紡絲膜抑菌測試 35 4.3.12 統計分析 36 第五章、結果與討論 37 5.1靜電紡絲溶液設計 37 5.2靜電紡絲操作參數設定 38 5.3樣品結晶結構分析 44 5.4樣品熱重分析 46 5.5樣品承載效率 50 5.6抗菌試驗 52 第六章、結論 53 第七章、未來展望 54 第八章、參考資料 55 附錄一 i | |
dc.language.iso | zh-TW | |
dc.title | 以靜電紡絲技術包埋檸檬烯於β環狀糊精及聚乙烯醇奈米纖維之新穎活性包材開發 | zh_TW |
dc.title | Electrospinning Encapsulation of D-limonene into Nanofiber of β-cyclodextrin and Polyvinyl Alcohol for Developing a Novel Active Packaging Material | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 吳瑞碧,吳明昌,沈賜川,林哲安 | |
dc.subject.keyword | 靜電紡絲,β環狀糊精,R-(+)-檸檬烯,聚乙烯醇,抗菌包裝, | zh_TW |
dc.subject.keyword | electrospinning,β-cyclodextrin,R-(+)-limonene,active packaging,antibacterial food packaging, | en |
dc.relation.page | 68 | |
dc.identifier.doi | 10.6342/NTU201901619 | |
dc.rights.note | 同意授權(全球公開) | |
dc.date.accepted | 2019-07-26 | |
dc.contributor.author-college | 生物資源暨農學院 | zh_TW |
dc.contributor.author-dept | 食品科技研究所 | zh_TW |
dc.date.embargo-lift | 2022-06-30 | - |
顯示於系所單位: | 食品科技研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-108-R06641021-1.pdf | 4.05 MB | Adobe PDF | 檢視/開啟 |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。