Studies on Stability of Immunoglobulin G of Microencapsulated Bovine Colostrums and Whey 沈子偉、張基郁
E-mail: [email protected]
ABSTRACT
The bovine colostrums collected from the second to the fourth day postpartum were mixed by equal volume and used as raw materials. A 10 % aqueous solution of gum arabic, β-cyclodextrin (β-CD) or chitosan was added to an equal volume of colostrums or whey, and microencapsulated through freeze drying and spray dryng methods. The effects of pH value, temperature, pepsin and trypsin, lipopolysaccharides (LPS) from E. coli (serotype O55:B5), and storage time on the IgG activity of microencapsulated colostrums and whey were investigated. Results showed that microencapsulated colostrums prepared through freeze drying had higher IgG activity than those prepared through the spray drying. The results for the effects of the five factors on the IgG activity of microencapsulated colostrums and whey were summarized as follows: (1) pH stability: The non-microencapsulated colostrums were found to have higher IgG activity at a pH value of 7~8 than the microencapsulated colostrums; the microencapsulated colostrums with gum arabic were found to have higher IgG residual activity at a pH value of 7~8. (2) Thermal stability: Gum arabic and β-cyclodextrin (β-CD) were found to have a protective effect on the IgG activity of colostrums and whey. (3) Pepsin and trypsin Tolerance: Under the action of pepsin for two hours, the residual IgG activities of microencapsulated colostrums with gum arabic and β-cyclodextrin (β-CD) were higher by 9.8 % and 7.6 %, respectively, than that of non-microencapsulated colostrums. After further action by trypsin for four hours, no significant differences were found between microencapsulated and
non-microencapsulated colostrums. However, the action of pepsin and trypsin did not significantly affect the IgG residual activity of microencapsulated whey. (4) Action of LPS from microorganisms: The E. coli (serotype O55:B5 form) was found to have an
antigen-antibody affinity with the IgG of colostrums and whey. However, after the action of pepsin and the effect of LPS from E. coli (serotype O55:B5 form), the microencapsulated colostrums with gum arabic was found to have higher IgG activity than the
non-microencapsulated colostrums. (5) Storage stability: Storage temperature and packaging materials were found to have a significant impact on the residual IgG activity of colostrums and whey. After being stored for 60 days at 4 ℃, the IgG activity was found to be higher than that stored at room temperature. As for packaging materials, aluminum bag-packaged colostrums and whey were found to have a higher IgG activity than transparent plastic bag-packaged colostrums. After storage for 60 days at 4 ℃, the microencapsulated colostrums with gum arabic were found to have a significantly higher IgG residual activity than the
non-microencapsulated colostrums.
Keywords : Bovine colostrums, β-Cyclodextrin (β-CD), Chitosan, Gum arabic, Microencapsulation.
Table of Contents
封面內頁 簽名頁 授權書iii 中文摘要iv 英文摘要vi 誌謝viii 目錄ix 圖目錄xii 表目錄xv 第一章?言1 第二章文獻回顧3 2.1牛初 乳3 2.1.1牛初乳簡介3 2.1.2牛初乳的成分4 2.1.3牛初乳中蛋白質組成4 2.2免疫系統7 2.2.1免疫系統及其反應7 2.2.2抗體簡介9 2.2.3抗體的種類10 2.2.4抗體之防禦機制11 2.2.5免疫球蛋白之安定性15 2.3免疫球蛋白G (IgG)之分析法16 2.3.1定量分析16 2.3.2定性分析19 2.4微膠囊化19 2.4.1微膠囊化定義19 2.4.2微膠囊化方法20 2.4.3微膠囊化包覆粉體種類24 第三章材料與方 法32 3.1實驗材料32 3.1.1樣品製備32 3.1.2包覆粉體32 3.1.3試藥33 3.1.4儀器33 3.2實驗方法34 3.2.1基本組成分析34 3.2.2牛 初乳與乳清之微膠囊化38 3.2.3電子顯微鏡之觀察41 3.2.4微膠囊化IgG安定性之測定41 3.2.5IgG對胃腸蛋白?之耐受性42 3.2.6牛初乳和乳清與微生物脂多醣之親和性43 3.2.7統計分析44 第四章結果與討論45 4.1初乳和乳清之一般基本組成45 4.2 初乳IgG之定量分析47 4.3微膠囊化處理47 4.3.1不同微膠囊化方法之比較47 4.3.2電子顯微鏡觀察結果50 4.4酸鹼對IgG安定 性影響53 4.5熱處理對IgG安定性影響58 4.6胃腸消化酵素對IgG之影響62 4.7與微生物脂多醣作用之親和力64 4.8初乳與乳 清IgG之儲藏安定性68 第五章結論76 參考文獻78 圖目錄 圖2.1免疫球蛋白的結構:(a)分子結構(b)分子褶疊的特徵結構13 圖2.2微膠囊的各種包覆形式22 圖2.3α、β及γ-環狀糊精結構27 圖2.4幾丁質及幾丁聚醣之化學結構30 圖3.1本研究之實驗 流程35 圖3.2酵素連接免疫吸附分析法39 圖4.1牛血清IgG以ELISA法所得之標準曲線48 圖4.2牛血清IgG以ELISA法所得之 標準曲線及線性回歸之R-square(0.9882)48 圖4.3以不同乾燥法進行微膠囊化所得初乳之IgG殘存活性49 圖4.4以不同乾燥法 進行微膠囊化所得初乳之IgG殘存活性51 圖4.5初乳(A)及以阿拉伯膠(B)、β-環狀糊精(C)、幾丁聚醣(D)微膠囊化之初乳掃描 式電子顯微照片52 圖4.6乳清(A)及以阿拉伯膠(B)、β-環狀糊精(C)、幾丁聚醣(D)微膠囊化之乳清掃描式電子顯微照片54 圖4.7在不同pH值下之初乳和微膠囊化初乳之IgG活性55 圖4.8在不同pH值下之乳清和微膠囊化乳清之IgG活性56 圖4.9 在pH 7和8下之初乳及微膠囊化初乳之IgG殘存活性57 圖4.10在pH 7和8下之乳清及微膠囊化乳清之IgG殘存活性59 圖4.11
初乳及微膠囊化初乳分別經63.5 ℃加熱30 min及75 ℃加熱15 sec後之IgG殘存活性60 圖4.12乳清及微膠囊化乳清分別經63.5
℃加熱30 min及75 ℃加熱15 sec後之IgG殘存活性61 圖4.13初乳和乳清於不同pH值下經pepsin作用1、2、4、8小時後之IgG 殘存活性63 圖4.14初乳及微膠囊化初乳以胃蛋白?作用2小時及胰蛋白?作用4小時後之IgG殘存活性65 圖4.15乳清及微膠囊 化乳清以胃蛋白?作用2小時及胰蛋白?作用4小時後之IgG殘存活性66 圖4.16初乳與乳清經E. coli O55:B5脂多醣及兔子抗牛 血清IgG反應後之ELISA值67 圖4.17未微膠囊化及以阿拉伯膠微膠囊化之初乳與乳清經胃蛋白?和胰蛋白?水解後,再經E.
coli O55:B5脂多醣作用後之IgG殘存活性69 圖4.18未微膠囊化及以阿拉伯膠微膠囊化之初乳和乳清以透光塑膠袋包裝並在 不同溫度(4 ℃和室溫)下儲存60天期間之IgG殘存活性70 圖4.19未微膠囊化及以阿拉伯膠微膠囊化之初乳和乳清以鋁袋包裝 並在不同溫度(4 ℃和室溫)下儲存60天期間之IgG殘存活性72 圖4.20未微膠囊化與微膠囊化初乳和乳清在室溫下以透光塑膠 袋和鋁袋儲存60天後之IgG殘存活性73 圖4.21未微膠囊化與微膠囊化初乳和乳清在4 ℃和室溫下以透光塑膠袋儲存60天後 之IgG殘存活性74 表目錄 表2.1初乳與常乳的成分5 表2.2微膠囊包覆各種技術23 表4.1初乳和乳清一般基本組成46
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