請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/93373完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 柯淳涵 | zh_TW |
| dc.contributor.advisor | Chun-Han Ko | en |
| dc.contributor.author | 莊庭瑜 | zh_TW |
| dc.contributor.author | Ting-Yu Chuang | en |
| dc.date.accessioned | 2024-07-30T16:11:38Z | - |
| dc.date.available | 2024-07-31 | - |
| dc.date.copyright | 2024-07-30 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-07-27 | - |
| dc.identifier.citation | References
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/93373 | - |
| dc.description.abstract | 近年來，由於疫情影響和中藥材的廣泛使用，魚腥草（Houttuynia cordata）因其抗病毒、抗發炎和抗氧化的特性而備受關注。魚腥草中的黃酮類化合物、黃酮醣苷和多酚等成分具有抗氧化特性，可以中和自由基，減少紫外線對皮膚的損傷。此外，魚腥草殘渣作為生物質能源，與化石燃料相比，燃燒時的碳排放量更低，有助於減少溫室氣體排放，實現減排目標。
本研究將分為魚腥草有效成分以及殘渣再利用兩個部分，用不同蒸煮時間的水萃液加入乳膏，觀察其吸光值的變化；另外，水萃完後的殘渣，將會使用TEMPO氧化水解，再搭配超聲波處理，觀察在不同水解時間，以及搭配不同超聲波處理時間的纖維素粒徑變化、吸光值變化以及有無抑菌效果。 研究結果顯示，水萃液會隨著蒸煮的時間拉長，吸光值以及總黃酮含量增加，且加入乳膏後仍有一樣的趨勢。殘渣再利用則是隨著蒸煮時間越長，因纖維素受熱後結構變得更不規則及疏鬆，且失去了部分的強度及熱穩定性，水解後的粒徑會變得更小，但吸光值也隨之下降，此外在此實驗中發現拉長TEMPO水解時間，縮小的幅度不是很大，故使用了水解1小時後的水解液搭配超聲波處理，隨著超聲波的時間拉長，粒徑有明顯的縮小，且因超聲波可以有效提高水中纖維素的緻密性，從而提高吸光值，提高防曬的效果。TEMPO水解後的水解液皆不具有抑菌效果，推測因水解後產生的含氧官能基與次氯酸鈉作用，消耗了次氯酸鈉，且次氯酸鈉屬於易揮發性，在反應過程中除了自身容易溢散，也間接帶走魚腥草可以抗菌抗發炎的揮發性成分。 | zh_TW |
| dc.description.abstract | In recent years, due to the pandemic and the use of traditional Chinese medicine, Houttuynia cordata has gained attention for its antiviral, anti-inflammatory, and antioxidant properties. Its flavonoids and polyphenols reduce UV skin damage. Additionally, using H. cordata residue as biomass lowers carbon emissions compared to fossil fuels, aiding in emission reduction goals.
This experiment has two parts: investigating active ingredients in H. cordata and reusing its residue. In the first part, extracts from water decoction at different boiling times will be added to creams, and absorbance changes will be observed. The residue will undergo TEMPO oxidation hydrolysis and ultrasonic treatment in the second part. The changes in cellulose particle size, absorbance, and antimicrobial effects will be observed with varying hydrolysis times and ultrasonic durations. The research shows that the absorbance and total flavonoid content of H. cordata water extract increase with longer boiling times, even after adding to cream. Regarding residue reuse, prolonged boiling causes the cellulose structure to become irregular and lose strength, leading to smaller particle sizes post-hydrolysis but lower absorbance. Extended TEMPO hydrolysis time did not significantly reduce particle size, so a 1-hour hydrolyzed solution combined with ultrasonic treatment was used. Longer ultrasonic times reduced considerably particle size and increased absorbance, enhancing the sunscreen effect. However, the hydrolyzed solutions showed no antimicrobial effect, likely due to the interaction of oxygen-containing groups with sodium hypochlorite, consuming it and carrying away volatile antimicrobial components. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-07-30T16:11:38Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-07-30T16:11:38Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員會審定書 I
誌謝 II 摘要 III Abstract IV Contents V Figure index VIII Table index XI Chapter 1 Introduction 1 Chapter 2 Literature review 3 2.1 A Brief Introduction to H. cordata 3 2.1.1 Botanical description 3 2.1.2 Component Analysis 5 2.1.3 Application of H. cordata 8 2.1.3.1 Pharmacological applications 8 2.1.3.2 Food and skincare cosmetics-related applications 10 2.2 Introduction to chemical hydrolysis of cellulose 11 2.2.1 Common types of chemical hydrolysis 11 2.2.1.1 Alkaline hydrolysis 11 2.2.1.2 Acid hydrolysis 13 2.2.1.3 Enzymatic hydrolysis 14 2.2.2 TEMPO-mediated oxidation 15 2.3 Ultrasonic hydrolysis of cellulose 18 2.3.1 Ultrasonic treatment principle 18 2.3.2 Ultrasonic-assisted chemical hydrolysis 21 2.3.3 TEMPO hydrolysis combined with ultrasonication 23 2.4 Sunscreen introduction 25 2.4.1 Physical sunscreen 27 2.4.2 Chemical sunscreen 27 2.4.3 Natural sunscreen 29 2.4.3.1 Quercetin 31 2.5 Antibacterial action 32 2.5.1 Antibacterial effect of H. cordata 33 2.5.2 Antibacterial effects of quercetin 34 Chapter 3 Material and Methods 35 3.1 Research framework 35 3.2 Experimental materials and equipment 37 3.2.1 Experimental materials 37 3.2.2 Laboratory equipment 37 3.3 Experimental procedure 38 3.3.1 Water extraction process of H. cordata 38 3.3.1.1 Obtain extract by boiling H. cordata in hot water. 38 3.3.1.2 Process of making cream 39 3.3.2 Reuse of residual after water extraction 41 3.3.2.1 TEMPO hydrolysis 41 3.3.2.2 TEMPO hydrolysis combine with ultrasonication 41 3.3.2.3 Antibacterial effects 42 3.4 Instrumental analysis 43 3.4.1 Particle size and shape analyzer 43 3.4.2 UV absorption testing 44 Chapter 4 Result and discussion 47 4.1 Water extract and homemade cream experiment 47 4.1.1 Absorbance values at different water extraction times 47 4.1.2 Total flavonoid content calculation 49 4.2 Particle size analysis of TEMPO hydrolysis residues 51 4.2.1 Non-centrifuged hydrolysate 51 4.2.1.1 Unsieved 51 4.2.1.2 Sieved 54 4.2.2 Centrifuged hydrolysate 56 4.2.2.1 Unsieved 56 4.2.2.2 Sieved 59 4.3 Absorbance test for recycling TEMPO hydrolysis residue 62 4.3.1 Non-centrifuged hydrolysate 62 4.3.1.1 Unsieved 62 4.3.1.2 Sieved 65 4.3.2 Centrifuged hydrolysate 66 4.3.2.1 Unsieved 66 4.3.2.2 Sieved 69 4.4 Particle size ultrasound of TEMPO-hydrolyzed residues. 71 4.5 Absorbance of TEMPO hydrolyzed residue with ultrasonic treatment 76 4.6 The sunscreen properties of quercetin 80 4.7 Zone of inhibition test 82 4.7.1 Residual reuse antibacterial test 82 4.7.2 Quercetin antibacterial test 85 Chapter 5 Conclusion 87 References 90 Appendix 101 | - |
| dc.language.iso | en | - |
| dc.subject | 防曬 | zh_TW |
| dc.subject | TEMPO氧化水解 | zh_TW |
| dc.subject | 超聲波 | zh_TW |
| dc.subject | 抗菌作用 | zh_TW |
| dc.subject | 魚腥草 | zh_TW |
| dc.subject | 總黃酮含量 | zh_TW |
| dc.subject | 殘渣再利用 | zh_TW |
| dc.subject | 紫外線吸收值 | zh_TW |
| dc.subject | Houttuynia cordata | en |
| dc.subject | total flavonoid content | en |
| dc.subject | residue reuse | en |
| dc.subject | sunscreen | en |
| dc.subject | Antimicrobial activity | en |
| dc.subject | ultrasonic treatment | en |
| dc.subject | TEMPO oxidation hydrolysis | en |
| dc.subject | UV absorption value | en |
| dc.title | 魚腥草生質物防曬效能 | zh_TW |
| dc.title | Sunscreen Efficacy of Biomass from Houttuynia cordata | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 112-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 張資正;鄭森松 | zh_TW |
| dc.contributor.oralexamcommittee | Tzu-Cheng Chang;Sen-Sung Cheng | en |
| dc.subject.keyword | 魚腥草,防曬,殘渣再利用,總黃酮含量,紫外線吸收值,TEMPO氧化水解,超聲波,抗菌作用, | zh_TW |
| dc.subject.keyword | Houttuynia cordata,sunscreen,residue reuse,total flavonoid content,UV absorption value,TEMPO oxidation hydrolysis,ultrasonic treatment,Antimicrobial activity, | en |
| dc.relation.page | 108 | - |
| dc.identifier.doi | 10.6342/NTU202402324 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2024-07-30 | - |
| dc.contributor.author-college | 生物資源暨農學院 | - |
| dc.contributor.author-dept | 森林環境暨資源學系 | - |
| 顯示於系所單位： | 森林環境暨資源學系 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-112-2.pdf 未授權公開取用 | 3.13 MB | Adobe PDF |
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