本文選題：烏飯樹 + 多糖　； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：烏飯樹樹葉含有多種活性成分。本文連續(xù)分級提取了烏飯樹樹葉多糖,測定了烏飯樹樹葉多糖的組成成分和基本特性,研究了烏飯樹樹葉多糖的流變學(xué)特性和乳化活性,分析了烏飯樹樹葉多糖的抗氧化活性,并對烏飯樹樹葉多糖四種組分的上述性質(zhì)進(jìn)行了比較。不同的提取方法會引起多糖的理化性質(zhì)產(chǎn)生差異。烏飯樹樹葉經(jīng)熱緩沖液、螯合劑、稀堿溶液和濃堿溶液連續(xù)提取后得到四種多糖組分:HBSS、CHSS、DASS和CASS。傅里葉紅外光譜分析表明烏飯樹樹葉多糖在3600 3200 cm-1和1200 800cm-1呈現(xiàn)糖類的特征吸收峰。高效液相色譜法測定提取的四種多糖組分的分子量分別為7.66×103,5.92×103,1.02×104,7.64×102 kDa。HBSS主要由阿拉伯糖、葡萄糖、半乳糖組成,CHSS主要由阿拉伯糖、半乳糖組成,DASS主要由鼠李糖、阿拉伯糖組成,CASS主要由阿拉伯糖、木糖、葡萄糖、半乳糖組成。在20-300°C溫度范圍內(nèi),CHSS表現(xiàn)出最高的峰值溫度,HBSS具有最高的熱焓。HBSS乳化活性最強(qiáng),CASS乳化穩(wěn)定時間最長。4種烏飯樹樹葉多糖的流變性質(zhì)存在一定的差異。在質(zhì)量濃度為0.6-2.5%的范圍內(nèi),該多糖水溶液表現(xiàn)為典型的非牛頓流體剪切稀化特征。在pH為4.0或10.0,高溫以及Ca~(2+)存在的條件下,該多糖溶液的表觀粘度減小;而在低溫或Na~+存在的條件下,其表觀粘度會增加。4種烏飯樹樹葉多糖組分在抗氧化活性上有一定的差異。其中CASS具有最高的還原力;CHSS能有效地清除DPPH自由基;HBSS對羥基和ABTS自由基的清除能力最強(qiáng);CHSS對亞鐵離子的螯合能力相較于其他三種組分更強(qiáng)。上述對烏飯樹樹葉多糖理化特性和抗氧化性的研究,將來可能在功能食品中應(yīng)用。
[Abstract]:The leaves of Eucalyptus chinensis contain a variety of active ingredients. In this paper, the polysaccharides from leaves of black rice were extracted continuously, the components and basic characteristics of polysaccharides from leaves were determined, the rheological properties and emulsifying activities of polysaccharides from leaves of black rice were studied, and the antioxidant activities of polysaccharides from leaves of black rice were analyzed. The above properties of four polysaccharides from leaves were compared. Different extraction methods may lead to different physicochemical properties of polysaccharides. Four kinds of polysaccharides were obtained by continuous extraction in hot buffer solution, chelating agent, dilute alkali solution and concentrated alkali solution. Fourier transform infrared spectroscopy (FTIR) analysis showed that polysaccharides from leaves of Prunus chinensis showed the characteristic absorption peaks of carbohydrates at 3600 ~ 3200 cm-1 and 1200 800cm-1. The molecular weight of the four polysaccharides extracted by HPLC was 7.66 脳 10 ~ 3N 5.92 脳 10 ~ 3N ~ (1.02) 脳 10 ~ (4) C ~ (7.64 脳 10 ~ 2) kDa.HBSS mainly consisted of arabinose, glucose and galactose, and its components were mainly composed of arabinose, galactose and rhamnose. Arabinose consists of arabinose, xylose, glucose and galactose. In the temperature range of 20-300 擄C, CHSS showed the highest peak temperature and HBSS had the highest heat enthalpy. HBSS emulsification activity was the strongest. There was some difference in rheological properties of polysaccharides from leaves of Cass with the longest time of emulsification and stabilization. In the range of 0.6-2.5%, the polysaccharide aqueous solution exhibits typical shear thinning characteristics of non-Newtonian fluids. The apparent viscosity of the polysaccharide solution decreased at pH 4.0 or 10.0, at high temperature and in the presence of CaTi2, while at low temperature or in the presence of Na ~, the apparent viscosity of the polysaccharide solution decreased. The apparent viscosity increased the antioxidant activity of 4. 4 species of leaves polysaccharides. Among them, Cass has the highest reductive power and CHSS can effectively scavenge DPPH free radical HBSS to hydroxyl radical and Abts radical. CHSS has stronger chelating ability to ferrous ion than the other three components. The above studies on the physicochemical properties and antioxidant properties of Polysaccharide from leaves may be used in functional foods in the future.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ281

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