共查询到19条相似文献,搜索用时 125 毫秒
1.
2.
海洋生物抗氧化活性物质的研究进展 总被引:1,自引:0,他引:1
综述了海洋生物抗氧化活性物质种类及研究现状,讨论了海洋生物抗氧化活性物质的抗氧化作用及其机理,并展望了从海洋中寻找抗氧化活性物质的广阔前景。 相似文献
3.
4.
5.
植物多糖作为一种具备多种生物活性的天然产物,因高效、低毒而成为食品抗氧化活性领域的研究热点.本文概括了近年来国内外具有抗氧化活性的植物多糖的种类,从多糖直接、间接作用于自由基两个方面阐述了植物多糖的抗氧化性,总结了植物多糖抗氧化的作用机制及主要信号通路,并探讨了植物多糖抗氧化活性的构效关系,对植物多糖抗氧化活性的研究方... 相似文献
6.
7.
8.
钱开胜 《柑桔与亚热带果树信息》2008,(2):53-53
2007年9月25日华尔街杂志健康专栏发表了对苹果汁潜在的抗氧化功效作了高度评价的文章。执笔者Katy McLaughlin针对RuiHaiLiu博士所进行的苹果汁抗氧化机能的研究指出:苹果汁,特别是未经过滤的苹果汁应作为贵重的抗氧化化合物加以重新评价。 相似文献
9.
以葡萄皮渣为试材,采用微波辅助提取方法和体外抗氧化试验,研究了葡萄皮渣中原花青素提取工艺和体外抗氧化活性。结果表明:最佳工艺为乙醇体积分数60%(v/v)、料液比1∶20g·mL~(-1)、微波时间90s、微波功率800W。在此条件下,原花青素提取率为9.12mg·g~(-1)。体外抗氧化试验中,葡萄皮渣原花青素提取物表现明显的抗氧化能力,对DPPH自由基(DPPH·)和羟基自由基(·OH)具有较好的清除能力,但抗氧化能力比维生素C弱。 相似文献
10.
11.
新疆17个杏品种的抗氧化指标与总酚含量的测定 总被引:2,自引:0,他引:2
为了研究新疆杏的遗传多样性,寻找抗氧化能力较强的功能性杏品种,为保护利用杏资源提供基础,试验采用铁离子还原法(FRAP)、二苯代苦味酰基自由基法(DPPH.)清除法和邻二氮菲-Fe2+氧化法3种方法从总抗氧化能力、DPPH.自由基清除能力和羟基自由基清除能力的角度测评了不同杏品种的抗氧化活性;用Folin-Ciocalteau法测定总酚含量。3种抗氧化指标显示:17个参试杏品种都具有强抗氧化性,并且大多数品种间差异显著,其中骆驼黄和奎克皮曼的抗氧化能力最强,不同品种间的总酚含量差异较大,变化值为1554.47μg/g,最大含量是最小含量的6.05倍,其中骆驼黄的总酚含量最高为1862.18μg/g,黑叶杏的总酚含量最低为307.71μg/g。各种抗氧化指标与总酚含量呈显著正相关,多酚类物质应该是其抗氧化的主要物质基础。 相似文献
12.
Xing-Liang Li Jun-Ke Zhang Min-Ji Li Bei-Bei Zhou Qiang Zhang 《The Journal of Horticultural Science and Biotechnology》2018,93(4):337-346
Antioxidant enzymes were well-known for reactive oxygen scavenging and protecting cells from oxidative damage in multiple biotic and abiotic stresses. Aimed to overview of antioxidant enzyme gene families and screen for drought and low-temperature response members, the whole apple antioxidant enzyme genes in apple genome were studied. Out of 73candidates in seven antioxidant enzyme gene families among the entire apple genome, a total of 49 genes were identified, showed more antioxidant enzyme gene members than those in other plant species. A phylogenetic tree based on predicted functional domains and motifs of apple and Arabidopsis antioxidant enzymes revealed 19 putative drought or low-temperature response genes, and 9 out 19 genes belong to five families responded to both drought and low-temperature stresses. Subsequently, cis-elements in those nine antioxidant enzyme gene promoters were examined and abundant elements involved in multiple hormone regulation and abiotic stresses response, including drought and low-temperature were found. The tissue expression specificity for those nine members in eight kinds of tissues was also examined. Screening and identifying both drought and low-temperature response genes provide useful information to understand gene functions and promote application of antioxidant enzyme genes in apple abiotic resistance breeding. 相似文献
13.
不同采收季节对叶用芥菜类黄酮物质含量和抗氧化活性的影响 总被引:1,自引:1,他引:1
以10个不同基因型叶用芥菜为试材, 研究了不同采收季节对其总酚含量、类黄酮含量和抗氧化活性的影响。结果表明春季采收的总酚含量、抗氧化活性显著高于冬季采收的。叶用芥菜含有槲皮素和山奈素两种类黄酮化合物, 春季采收的槲皮素和山奈素含量高于冬季采收的。基因型间总酚、槲皮素和山奈素的含量及抗氧化活性均存在较大的差异, 并与生长季节有极显著的互作关系, 表明生长季节对不同基因型叶用芥菜酚类物质积累和抗氧化活性有较大的影响。总酚、槲皮素和山奈素的含量分别与抗氧化活性呈极显著和显著正相关。 相似文献
14.
Antioxidant capacity, antioxidant compounds and antioxidant enzyme activities in dates of five cultivars during development and ripening were studied in the 2009 and 2010 seasons. Fruit growth followed a smooth sigmoid curve with maximum weight at the bisir stage. Both the antioxidant capacity measured by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method and the antioxidant compound (phenols, tannins and vitamin C) concentrations decreased from young stages through to the maturation and the ripening stages. The antioxidant capacity was highly positively correlated with the concentration of antioxidant compounds in most cultivars. The activities of the antioxidant enzymes, peroxidase, catalase and polyphenoloxidase (PPO) increased from the hababouk through to the kimri and/or the bisir stage, upon cultivar, and thereafter, declined at the ripening stages. The possible relation of these biochemical changes with fruit maturation and ripening was discussed. 相似文献
15.
Xiaowei Ma Hongxia WuLiqin Liu Quansheng YaoSongbiao Wang Rulin ZhanShanshan Xing Yigang Zhou 《Scientia Horticulturae》2011
Fruit of eight mango genotypes were evaluated for antioxidant potential by several biochemical assays (DPPH, ABTS, ORAC, FRAP, SASR and MCC) and tested for their polyphenol composition and vitamin C contents. The significance analysis demonstrated that the antioxidant capacity of Tainong 1 fruits were significantly higher than that of other genotypes, which was about 2.1–6.3-fold higher than Guifei assayed in ABTS, DPPH, ORAC and FRAP methods. The total polyphenols and flavonoids contents showed a great variety amongst mango genotypes and highly correlation with the total antioxidant capacity. It is concluded that significant genotypic difference exists in the total antioxidant capacity of mango fruits. Both total polyphenols and flavonoids are major contributors to the total antioxidant capacity in mango fruit. 相似文献
16.
为分析不同李品种果实中多酚含量及其抗氧化能力,以14个李品种为试材,测定果皮和果肉中的多酚含量,采用超氧自由基(O_2~-)清除法、羟自由基(OH·)清除法、DPPH法、FRAP法和TBARS法测定抗氧化能力,比较多酚含量、抗氧化能力的差异,分析多酚含量与抗氧化能力的相关性,比较抗氧化能力测定方法间的相关性。结果表明:(1)李果实中富含多酚并且品种间存在差异,不同品种果皮中含量为1.40~3.37 mg·g~(-1) FW,果肉中含量为0.50~0.97 mg·g~(-1) FW,果皮中含量远大于果肉中含量;果皮中多酚含量较高的李品种为皇后李、猪肝李,其次为黑宝石李、红玫瑰李;果肉中多酚含量最高的为秋姬李,其次为威克逊李。(2)李果皮、果肉多酚提取物均具有较强的抗氧化能力,果皮提取物综合抗氧化能力较强的为皇后李、黑宝石李和猪肝李,果肉的为红美丽李、红玫瑰李和秋姬李。(3)果皮中多酚含量与清除O_2~-、OH·能力及DPPH、FRAP、TBARS均呈极显著正相关,果肉中多酚含量与抗氧化能力呈显著正相关。(4)对5种方法的相关性分析表明,各方法从不同的角度评价李果多酚抗氧化能力,方法间均具有很好的相关性,DPPH法与FRAP法综合评价最佳,可作为主要选择。 相似文献
17.
苹果加工品种多酚提取物的抗氧化效果分析 总被引:5,自引:0,他引:5
研究加工苹果品种的多酚组成及其抗氧化功能,有助于加工原料的选择和功能性食品的开发。测定了4个酿酒品种和4个制汁品种果实的多酚组成,果实多酚提取物清除超氧阴离子自由基、羟基自由基能力和抗脂质过氧化能力。结果表明,供试加工品种总酚含量为644.9 ̄3511.8mg/kg,原花青素、绿原酸、表儿茶素、儿茶素是果实中的主要多酚物质。各品种多酚提取物都有一定的抗氧化能力,以稀释10倍的浓度清除3种自由基的能力较强。原花青素、儿茶素与加工苹果果实抗氧化能力有较密切的关系。 相似文献
18.
Salt stress has been applied to improve the quality of tomato, but detailed information about the changes in antioxidant systems in salt-stressed fruit is not available. In this study, we examined the effect of salt stress on oxidative parameters, antioxidant content and antioxidant enzymes in two tomato cultivars during two cropping seasons. Salt stress was applied by adding 100 mM NaCl to the nutrient solution. We show that tomato fruits have antioxidant systems to protect themselves from salt-induced oxidative stress. This finding is supported by the lipid peroxidation and hydrogen peroxide levels, which remained unchanged under salt stress conditions. However, these antioxidant systems depend on cultivars and cropping seasons. In the summer crop, the antioxidant systems in salt-stressed ‘House Momotaro’ can be attributed to the enzymatic reactions of ascorbate peroxidase (EC 1.11.1.11) and glutathione reductase (EC 1.6.4.2), while those in salt-stressed ‘Mini Carol’ can be attributed to their non-enzymatic reactions of ascorbate and glutathione. In the winter crop, the antioxidant systems were not influenced by salt stress in either cultivar. However, the proline content increased in both cropping seasons and cultivars. The seasonal and cultivar differences of salt-induced changes in the antioxidant systems may result from cultivar differences in antioxidant capacities and the interaction between salt stress and growth conditions such as temperature and solar radiation. 相似文献
19.
The aim of the present work is to analyse the way in which Se fertilization in both Se forms applied at different rates can affect the production and accumulation of Se and the foliar antioxidant capacity in lettuce plants Lactuca sativa L. cv Philipus. After different rates of sodium selenate and selenite were applied (5, 10, 20, 40, 60, 80, 120 μmol L−1), the foliar biomass, lipid peroxidation, Se accumulation, antioxidant compounds, and the antioxidant capacity were analysed. Our results indicate that the less toxic form was selenate, as it induced greater biomass, higher Se accumulation, and more antioxidant compounds than did selenite. The treatment of 40 μmol L−1 proved the most suitable for lettuce plants, as the antioxidant capacity and Se accumulation augmented without diminishing biomass, and making the two these lettuce plants healthier than control plants for human consumption, in comparison to control. Finally, regarding the antioxidant capacity test used (the ferric reducing ability of plasma [FRAP], 2,2-diphenyl-1-picryl-hydrazyl [DPPH] and reducing power), only FRAP showed a significant relationship with the different antioxidant compounds, while ascorbate best reflected the effect of Se on the antioxidant capacity under our experimental conditions. 相似文献