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以脱脂玉米皮为原料,优化超声辅助酶法提取玉米皮总多酚工艺,并对其抗氧化性进行体外研究。在单因素实验基础上,采用Box-Behnken响应面设计法,以总多酚提取量为响应值,对超声时间、酶解温度、酶加入量和液料比参数进行优化。确定玉米皮总多酚的最佳提取工艺为:超声时间7.5 min,酶解温度50℃,纤维素酶加入量4.20%,液料比39 mL/g。此条件下,脱脂玉米皮总多酚提取量为(5.46±0.15)mg/g,该法所得的提取工艺参数可靠,可为玉米皮的开发利用提供参考。采用DPPH·和ABTS+·清除法对玉米皮总多酚进行体外抗氧化实验,结果表明玉米皮多酚具有较强的抗氧化能力,可作为潜在天然抗氧化剂应用于食品行业。 相似文献
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新疆特色植物药桑(Morus nigra L.)含有丰富的功效成分,是一种重要的药食同源果树,药桑中的多酚类化合物有多种生物活性,具有现实研究价值。从新疆药桑多酚含量、组成、提取分离技术、抗炎、抗氧化活性等方面对药桑多酚的研究进行综述,旨在更好地为新疆药桑多酚进一步研究提供参考依据。 相似文献
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以玉米须为原料,利用酶法、微波、超声波和微波辅助超声波四种方式提取玉米须中的多酚,并研究了不同提取方式得到多酚的抗氧化活性。通过测定多酚的体外还原能力以及DPPH自由基、超氧自由基、羟基自由基和ABTS自由基的清除能力,考察四种提取方式得到多酚的抗氧化活性并进行比较。结果表明,微波辅助超声波提取得到的多酚含量最高,为1.975 mg/g;四种提取方式得到的多酚对DPPH自由基、超氧自由基、羟基自由基和ABTS自由基均具有较强的清除作用,且相关性显著,其中酶法提取多酚的清除能力均强于其余三种提取方式的清除能力,抗氧化活性由强到弱依次为酶法提取微波辅助超声波提取微波提取超声波提取。 相似文献
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海藻多酚是一类广泛存在于藻类体内的具有多元酚结构的次生代谢物,分子量分布范围复杂,是间苯三酚衍生物。由于我国海藻资源丰富,近年来,从海藻中提取的活性物质-海藻多酚逐渐进入人们的视野。随着对海藻多酚研究的深入,其独特的生物活性日益受到人们的关注。海藻多酚结构复杂,具有广泛的生物活性,对开发海洋保健食品、海洋药物具有重要意义。本文总结了近年来国内外海藻多酚抗氧化、抑菌、抗凝血、抗炎、抗肿瘤、抗糖尿病、抗肥胖、抗艾滋以及酶抑制等生物活性的研究进展,旨在为海藻多酚的深入研究以及藻类产品的开发与利用提供理论依据。 相似文献
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目的分析玉米须多酚成分及其抗氧化活性。方法采用Folin-Ciocalteu法测定玉米须中总多酚含量,利用HPLC法分析玉米须多酚成分;采用抗氧化能力指数(ORAC)法测定玉米须多酚的抗氧化活性。结果玉米须中总多酚含量为1.26 mg/g,含有儿茶素、绿原酸、咖啡酸、阿魏酸、根皮苷、槲皮素等多种多酚类物质,且具有一定的抗氧化活性,其平均ORAC值为469.6μmol TE/g。结论玉米须富含具有抗氧化活性的多酚成分,为玉米须进一步开发利用提供依据。 相似文献
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本文以玉米花丝多酚为研究对象,在单因素实验的基础上,利用响应面优化超声波辅助提取玉米花丝多酚工艺,考察超声波频率、超声波功率、超声波温度和超声波时间对玉米花丝多酚提取量的影响,同时探究玉米花丝多酚对大肠杆菌和金黄色葡萄球菌的抑菌活性。结果表明:在液料比30: 1、乙醇浓度60%、超声波频率40 kHz、超声波功率350 W、超声波温度56 ℃、超声波时间45 min时,玉米花丝多酚提取量为(13.31±0.12)mg/g;抑菌活性试验表明:不同浓度玉米花丝多酚对大肠杆菌和金黄色葡萄球菌均有一定的抑制效果,其最小抑菌浓度分别为2.5 mg/mL和2 mg/mL。 相似文献
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本文研究了煮后烘干、炒制和冻干加工对鲜玉米粉的基本成分、抗氧化性能和香气成分影响。结果表明:不同干燥工艺鲜玉米粉的淀粉、总糖、总黄酮和总酚含量差异显著(P<0.05),冷冻干燥鲜玉米粉总黄酮和总酚含量最高,分别为3.45和3.96 mg/g。冷冻干燥、煮后烘干的鲜玉米粉对DPPH自由基的清除率分别为60.5%、50.8%,对·OH的清除率分别为46.8%和39.6%。运用固相微萃取-气相色谱-质谱联用对鲜玉米粒和3种干燥工艺的鲜玉米粒的香气物质进行分析,共鉴定出79种挥发性物质,分别为醇类3种、醛类11种、酮类8种、烃类24种、酯类8种、杂环类25种。含苯环类芳香族化合物是鲜玉米的主体风味化合物。综合分析,冷冻干燥和煮后烘干的鲜玉米粒抗氧化能力较高,对于鲜玉米芳香族化合物也有较好保留。 相似文献
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酵母全营养型啤酒专用玉米糖浆的初步研究 总被引:3,自引:0,他引:3
研究了以脱胚玉米粉为原料生产符合酵母生长所需全部营养的啤酒专用玉米糖浆的最优工艺 ,采用 2种不同的液化酶液化 ,添加 2种不同麦芽与蛋白酶进行蛋白质休止 ,然后糖化、过滤、精制 ,比较所得各种糖浆的各项指标。结果表明 ,选用脱胚玉米粉 ,采用耐高温液化酶高温液化 ,灭酶冷却后 ,通过添加一定量的麦芽和蛋白酶 ,进行蛋白质水解 ,再添加少量糖化酶 ,然后过滤、精制 ,所得的玉米糖浆气味清香 ,颜色淡黄透明 ,其α 氨基氮含量和总氮含量均与麦汁接近 ,特别是核苷酸类物质 ,含量较高 ,总多酚含量较低 ,糖谱成分合理 ,基本上可以满足酵母生长所需的全部营养 ,只是糖浆中的发泡蛋白含量不足。 相似文献
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Abstract: Temperature dependence of the autoxidation of perilla oil and tocopherol degradation was studied with corn oil as a reference. The oils were oxidized in the dark at 20, 40, 60, and 80 °C. Oil oxidation was determined by peroxide and conjugated dienoic acid values. Tocopherols in the oils were quantified by HPLC. The oxidation of both oils increased with oxidation time and temperature. Induction periods for oil autoxidation decreased with temperature, and were longer in corn oil than in perilla oil, indicating higher sensitivity of perilla oil to oxidation. However, time lag for tocopherol degradation was longer in perilla oil, indicating higher stability of tocopherols in perilla oil than in corn oil. Activation energies for oil autoxidation and tocopherol degradation were higher in perilla oil (23.9 to 24.2, 9.8 kcal/mol, respectively) than in corn oil (12.5 to 15.8, 8.8 kcal/mol, respectively) indicating higher temperature-dependence in perilla oil. Higher stability of tocopherols in perilla oil was highly related with polyphenols. The study suggests that more careful temperature control is required to decrease the autoxidation of perilla oil than that of corn oil, and polyphenols contributed to the oxidative stability of perilla oil by protecting tocopherols from degradation, especially at the early stage of oil autoxidation. 相似文献
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Vincent B. Owona Ayissi Azadeh Ebrahimi Hermann Schluesenner 《Molecular nutrition & food research》2014,58(1):22-32
Polyphenols are a class of natural compounds widely distributed in fruits, vegetables, and plants. They have been reported to possess a wide range of activities in prevention and alleviation of various diseases like cancer, neuroinflammation, diabetes, and aging. Polyphenols are effective against chronic diseases and recent reports indicated strong epigenetic effects of polyphenols. Most of the studies investigating epigenetic effects of natural polyphenols have focused on their beneficial effects in cancer treatment. However, epigenetic defects have been demonstrated in many other diseases as well, and application of polyphenols to modulate the epigenome is becoming an interesting field of research. This review summarizes the effects of natural polyphenols in modulating epigenetic‐related enzymes as well as their effect in prevention and treatment of chronic diseases with a focus on SIRT1 modulation. We have also discussed the relation between the structure and function of epigenetic‐modifying polyphenols. 相似文献
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茶是世界上最受欢迎的饮料之一, 其含有丰富的茶多酚, 近来, 茶多酚对肠道菌群的调节作用引起了学术界的关注。肥胖可以导致心血管疾病、糖尿病、癌症等慢性疾病, 因此抗肥胖物质的研究与开发也是当下的研究热点之一, 茶多酚的抗肥胖作用也是其中的重要领域。本综述总结了茶多酚、肠道菌群以及肥胖三者的作用关系, 并对近5年相关的非临床以及临床研究进行了总结分析。总结发现茶多酚可以调节肠道菌群组成, 而肠道菌群也可以影响茶多酚的吸收与代谢。茶多酚可以通过增加益生菌的丰度以及调节能量消耗、营养物质消化吸收、脂质分解代谢和抑制脂肪细胞合成等方式发挥抗肥胖作用。目前对于茶多酚调节肠道菌群和抗肥胖作用的研究以动物模型为主, 且大多实验结果证实了茶多酚的肠道菌群调节作用及抗肥胖作用, 但是作用剂量尚不明确, 且茶多酚剂量毒性研究不足。另外该领域临床研究不足, 需要在未来进行更大样本量和更长时间的研究, 以实现茶渣等副产物的高价值利用并减少肥胖相关疾病。 相似文献
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Effects of natural antioxidants in the improvement of corn oil quality: olive leaf vs. lemon balm 下载免费PDF全文
Selin Şahin Mehmet Bilgin Ezgi Sayım Bedia Güvenilir 《International Journal of Food Science & Technology》2017,52(2):374-380
Commercially available corn oil was enriched in polyphenols by adding olive leaf and lemon balm extracts, respectively. First, dried and ground plants were extracted through homogeniser‐assisted extraction. Then, the dried extracts were partially dissolved into the corn oil by means of solid–liquid extraction method. Total phenolic content increased 9.5 and 2.5 times over the pure corn oil. The antioxidant activities of enriched oil by olive leaf and lemon balm extracts have been found almost 14 and 6 times higher than that of untreated oil, respectively. Olive leaf extract enhanced the quality better than lemon balm extract with respect to carotenoid (TCC) and chlorophyll contents. Addition of 0.12–0.15% natural antioxidants gave rise to increase in the stability of the oil (≈18%). 相似文献