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dc.contributor.advisorV. An-Erl Kingen_US
dc.contributor.authorShieh, Shuenn-Jyeen_US
dc.description.abstract在 製造高甲氧基果膠凝膠製品時,需添加高量(大於55%)的 蔗糖作為共溶 質,若能以代糖作有效的取代,當可顯著降低其中 所含的熱量,更有益 於人體健康。蔗糖在高甲氧基果膠凝膠製品 中除了促進凝膠外,尚有提 供甜味、貯藏性及增量、降低水活性 等功能,因此本研究首先選用多種 能提供類似機能性的代糖來取 代蔗糖,以加熱凝膠的方式製備樣品,並 以凝膠強度、 Hunter L,a,b值及Instron質地輪廓分析(TPA) 等物理測度方法 來評估各代糖的取代效果。結果指出在所試驗之增量型 代糖中以 山梨醇和木糖醇較具有幫助高甲氧基果膠凝膠的特性,且能明 顯 降低膠體的水活性。此外,山梨醇和木糖醇所形成的膠體明亮且 無褐 變現象發生。繼之以物理性質及官能品評為反應性狀,利用 反應曲面法( RSM)和三因子三層階的試驗設計來探討低糖高甲氧 基果膠凝膠的最適加 工條件。結果發現其最適加工條件為: 檸檬酸0.0025 M、山梨醇濃 度28.6 %及木糖醇濃度32.5 %。 此外本研究亦發現在低溫(4℃)下貯 藏三個月的凝膠製品,其水活性、色澤及外觀上並無明顯改變,僅有硬度 值和彈性度值略有增 加,且能提高品評員對製品的喜好性。zh_TW
dc.description.abstractLarge amounts (at least 55%) of sugar (sucrose) are required as the cosolute for gelation of high methoxyl pectin (HMP). The effective replacement of sucrose by other low-calorie replacers would be significantly favorable to human health. However, besides gelation, sucrose also provides sweetness, shelf life, and improves a number of properties such as bulking and lowering water activity in the gelled product. Therefore, several sugar replacers with similar functional properties were selected to replace sucrose in this study. The samples were formed by thermal gelation and the substitute effects of individual sugar replacers were evaluated by physical measurements including gel strength, Hunter L, a, b values, and Instron texture profile analysis (TPA). The results indicated that among the sugar bulking agents tested, sorbitol and xylitol possessed more effects on HMP gelation and significantly lowered the water activity. In addition, there were higher lightness and no browning reaction in the gels formed by sorbitol and xylitol. Response surface methodology (RSM) and a three-variable and three-level design were then used to determine the optimum processing conditions of the HMP gelled products based on the responses of physical measurements and sensory evaluation. The optimum processing condition was found to be citric acid 0.0025 M, sorbitol 28.6 %, and xylitol 32.5 %. After storage at 4℃for three months, it was also found that there was no significant change in water activity and appearance except slight increases of hardness and springiness values, and the products became more acceptable to the mass panel.en_US
dc.subjecthigh methoxyl pectinen_US
dc.subjectfunctional sugar replaceren_US
dc.subjecttexture profile analysisen_US
dc.subjectresponse surface methodologyen_US
dc.titleEffect of functional sugar replacer on the thermal gelation of high methoxyl pectinen_US
dc.typeThesis and Dissertationzh_TW
Appears in Collections:食品暨應用生物科技學系


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