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  1. NTU Theses and Dissertations Repository
  2. 生物資源暨農學院
  3. 動物科學技術學系
Please use this identifier to cite or link to this item: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/32501
Title: 應用最適化方法開發機能性發酵乳油
Development of a new functional fermented cream using optimization techniques
Authors: Chung-Hao Lai
賴仲豪
Advisor: 陳明汝
Keyword: β-環狀糊精,共軛亞麻仁油酸,Lactococcus lactis IO-1,
β-cyclodextrin,conjugated linoleic acid,Lactococcus lactis IO-1,
Publication Year : 2006
Degree: 碩士
Abstract: 本試驗之目的在探討乳油經β-環狀糊精(β-cyclodextrin, β-CD)處理及益生菌發酵對膽固醇及共軛亞麻仁油酸(conjugated linoleic acid, CLA)含量之影響,擬開發出具有幫助消化、預防癌症、心血管疾病和體重控制等保健功能之新機能性乳油製品。試驗中將乳油(18%乳脂),先以不同濃度(0、5及10%) β-CD於40℃以1200rpm攪拌混合移除膽固醇,添加益菌質再藉由經篩選可產生CLA之益生菌Lactococcus lactis IO-1 (Lc. lactis IO-1)於37℃發酵24小時,分別於0、12及24小時取樣分析益生菌數及CLA增加量,試驗以Box and Behnken(1960)之三因子三階次之實驗設計建立最適方程式後,再經序列二次規劃法(sequential quadratic programming, SQP),尋求低膽固醇、益生菌數及CLA增加量之機能性發酵乳油。結果顯示,菌元在乳油中培養24小時菌數可達8.6 log CFU/mL進入定常期(stationary phase),pH值及酸度分別為5.1和0.45%,隨菌數增加CLA增加量提高,於發酵24小時產量達高峰(增加59%)。β-CD雖可移除膽固醇(移除率80%),但會顯著影響菌元生長,進而影響CLA增加量。經SQP運算後所得之最適生產條件,β-CD、果寡糖和異麥芽寡糖分別為10%、3%和0%發酵24小時,但由於β-CD對於菌元生長和CLA產量有抑制之影響,故再單獨以益生菌生長速率和CLA增加量兩反應方程式經由SQP以作運算所得之最適生產條件為β-CD、果寡糖和異麥芽寡糖分別為0%、3%和2.57%,可製成機能性發酵乳油。貯存試驗顯示機能性發酵乳油貯存一個月後,Lc. lactis IO-1菌數仍保有107 CFU/mL以上,若是以外觀來說兩周為最佳保存期限。
Conjugated linoleic acids (CLA) are a mixture of octadecadienoic acids that have been recently recognized as anticarcinogens. A high level of cholesterol in the blood, hypercholesterolemia, is a major risk factor for coronary heart disease. The purpose of this research was to develop a new functional fermented cream with high level of CLA and low level of cholesterol using optimization techniques.
Different concentrations of β-cyclodextrin (β-CD; 0, 5, 10%) were blended with cream (18% fat) at 40℃ under 1200 rpm to reduce the cholesterol level, and then the samples were fermented with Lactococcus lactis IO-1 (Lc. lactis IO-1) at 37℃ for 24hr. The concentrations of CLA were determined every 12hr. Moreover, the proportion of the prebiotics and β-CD was optimized using response surface methodology (RSM) to first construct a surface model, with sequential quadratic programming (SQP) subsequently adopted to optimize the model.
Results indicated that the CLA levels were increased as the number of Lc. lactis IO-1 increased, and that addition of 10% β-CD in cream with 80% cholesterol reduction showed the best outcome. Furthermore, the Lc. lactis IO-1 fermentation also reduced the cholesterol concentration. This decholesterol phenomena might be explained by the enzyme activity of Lc. lactis IO-1. Optimization results demonstrated that cream blended with 10% β-CD and mixed with 3% fructooligosaccharides (FOS) would produce a new functional fermented cream with the highest CLA and the lowest cholesterol. The verification experiment yielded a result close to the predicted values, with no significant difference (P>0.05). The storage results showed that addition of prebiotics in the sample provided protection for the active organisms. These Lc. lactis IO-1 counts remained at 107 CFU/g for samples stored for one month.
URI: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/32501
Fulltext Rights: 有償授權
Appears in Collections:動物科學技術學系

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