Immunoassays for Studying the Effects of Heating Conditions on the Characteristics of Milk Proteins

碩士 === 靜宜大學 === 食品營養學系 === 102 === Milk products have to be pasteurized or sterilized. In this study, milk proteins-lactose model systems were used to investigate the effects of heat treatments on the structure, immunoreactivity, and antioxidant capicity of proteins. The changes of protein compositi...

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Main Authors: Chiang, Li-Yi, 江俐儀
Other Authors: Wang, Cheng-Hsin
Format: Others
Language:zh-TW
Published: 2014
Online Access:http://ndltd.ncl.edu.tw/handle/74847900334562184535
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spelling ndltd-TW-102PU0002550092016-03-28T04:20:55Z http://ndltd.ncl.edu.tw/handle/74847900334562184535 Immunoassays for Studying the Effects of Heating Conditions on the Characteristics of Milk Proteins 以免疫分析法探討加熱條件對牛乳蛋白質的影響 Chiang, Li-Yi 江俐儀 碩士 靜宜大學 食品營養學系 102 Milk products have to be pasteurized or sterilized. In this study, milk proteins-lactose model systems were used to investigate the effects of heat treatments on the structure, immunoreactivity, and antioxidant capicity of proteins. The changes of protein composition and immunoreactivity on heated raw milk and commercial milk products were also investigated. Precipitation at pH 4.6, Native-PAGE, reducing and non-reducing SDS-PAGE, Western blot analysis, and ELISA were used to elucidate the changes and the interactions among milk proteins. In model systems, the antioxidant capacity was analyzed by ABTS radical scavenging ability, ferrous ion chelating ability and reducing power methods. The results of electrophoresis and Western blot showed that the interactions and degree of polymerization increased among β-Lg, α-La and casein as the heating temperature increased. The immunoreactivity of β-Lg and α-La increased, measured with ELISA using β-Lg and α-La antibodies, as the temperature increased, indicating the protein unfolding and exposure of more epitopes. At temperatures above 80 ℃, the antioxidant properties increased significantly. However, only reducing power followed the above trend for model systems containing casein. The changes of protein composition and immunoreactivity for heated raw milk were similar to those in model systems. Combining electrophoresis and immunoassay could differentiate different heat-treated commercial milk products. Wang, Cheng-Hsin 王正新 2014 學位論文 ; thesis 108 zh-TW
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language zh-TW
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sources NDLTD
description 碩士 === 靜宜大學 === 食品營養學系 === 102 === Milk products have to be pasteurized or sterilized. In this study, milk proteins-lactose model systems were used to investigate the effects of heat treatments on the structure, immunoreactivity, and antioxidant capicity of proteins. The changes of protein composition and immunoreactivity on heated raw milk and commercial milk products were also investigated. Precipitation at pH 4.6, Native-PAGE, reducing and non-reducing SDS-PAGE, Western blot analysis, and ELISA were used to elucidate the changes and the interactions among milk proteins. In model systems, the antioxidant capacity was analyzed by ABTS radical scavenging ability, ferrous ion chelating ability and reducing power methods. The results of electrophoresis and Western blot showed that the interactions and degree of polymerization increased among β-Lg, α-La and casein as the heating temperature increased. The immunoreactivity of β-Lg and α-La increased, measured with ELISA using β-Lg and α-La antibodies, as the temperature increased, indicating the protein unfolding and exposure of more epitopes. At temperatures above 80 ℃, the antioxidant properties increased significantly. However, only reducing power followed the above trend for model systems containing casein. The changes of protein composition and immunoreactivity for heated raw milk were similar to those in model systems. Combining electrophoresis and immunoassay could differentiate different heat-treated commercial milk products.
author2 Wang, Cheng-Hsin
author_facet Wang, Cheng-Hsin
Chiang, Li-Yi
江俐儀
author Chiang, Li-Yi
江俐儀
spellingShingle Chiang, Li-Yi
江俐儀
Immunoassays for Studying the Effects of Heating Conditions on the Characteristics of Milk Proteins
author_sort Chiang, Li-Yi
title Immunoassays for Studying the Effects of Heating Conditions on the Characteristics of Milk Proteins
title_short Immunoassays for Studying the Effects of Heating Conditions on the Characteristics of Milk Proteins
title_full Immunoassays for Studying the Effects of Heating Conditions on the Characteristics of Milk Proteins
title_fullStr Immunoassays for Studying the Effects of Heating Conditions on the Characteristics of Milk Proteins
title_full_unstemmed Immunoassays for Studying the Effects of Heating Conditions on the Characteristics of Milk Proteins
title_sort immunoassays for studying the effects of heating conditions on the characteristics of milk proteins
publishDate 2014
url http://ndltd.ncl.edu.tw/handle/74847900334562184535
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