黑豆皮多酚提取物抗氧化活性研究

以黑豆皮为原料,分别利用体积分数70%的甲醇、乙醇和丙酮作为提取溶剂进行多酚类物质提取,研究提取物中总酚、总黄酮含量及抗氧化活性。结果显示:丙酮提取物的多酚得率最高[(11.23±0.05)g/100g],且提取物中的总酚含量为(845.32±21.35)mg/g,总黄酮含量为(63.72±2.35)mg/g。同时,丙酮提取物对DPPH自由基和ABTS自由基的IC_(50)分别为(0.059±0.005),(0.057±0.004)mg/mL,其抗氧化能力低于抗坏血酸而高于甲醇和乙醇提取物。     

溶剂与提取方式对苦荞提取液抗氧化性能的影响

目的:比较不同溶剂体系和提取方式对苦荞抗氧化活性物质含量及活性的影响,寻找适宜实验室使用的高效、便捷的苦养抗氧化活性物质的提取方法.方法:以苦荞麸皮为试材,对比不同溶剂(80%丙酮、50%丙酮、80%甲醇、60%甲醇、80%乙醇和纯乙醇)和提取方式(均质、回流、超声波助提、浸泡法及振摇法)对苦荞麸皮提取物的总酚、总黄酮含量及抗氧化活性(清除ABTS·+、DPPH·能力及在β-胡萝卜素-亚油酸体系中的护色效果)的影响.结果:不同溶剂体系中,80%丙酮提取液的总酚和总黄酮含量最高,分别为(2 370.27±137.94)mgGA eq/100g DW、(3 361.28±132.95)mg RU eq/100g DW,其次依次为50%丙酮＞80%甲醇＞60%甲醇＞80%乙醇＞乙醇;80%丙酮提取物在3个抗氧化模型评价中排序较高.以80%丙酮为溶剂,对比不同提取方式研究中,总酚含量由高到低依次为回流提取＞均质提取、超声波30 min提取及浸泡提取＞超声波10 min提取与振摇提取.其中,超声波30 min提取液在3个抗氧化模型中表现出最强的抗氧化能力.提取时间顺序:浸泡15 h＞回流2 h、振摇2 h＞均质10min/次(3次)、超声波30min＞超声波10min.结论:80%丙酮是适于苦荞抗氧化物质提取的溶剂体系,同时辅助超声波30 min处理.是实验室便捷、高效的提取方法.     

黄色洋葱皮不同溶剂多酚提取物的总酚、总黄酮含量及抗氧化活性

以黄色洋葱皮为原料,分别利用70%甲醇、70%乙醇和70%丙酮作为提取溶剂进行多酚类物质提取。测定提取物中的总酚含量、总黄酮含量并研究其抗氧化活性(DPPH自由基清除能力、ABTS自由基清除能力以及铁还原能力)。研究结果显示:利用甲醇作为提取剂所得的多酚类物质提取率最高(12.35%),并且提取物中总酚和总黄酮含量最高,分别为83.17、34.31 mg/g。同时,甲醇提取物对DPPH自由基和ABTS自由基的半抑制浓度IC₅₀分别为0.059和0.031 mg/mL,低于抗坏血酸而高于乙醇提取物和丙酮提取物。     

薛凡尼氏炭角菌发酵菌丝体提取物的抗氧化活性

分别采用4种不同溶剂(乙醇、甲醇、丙酮和水)对薛凡尼氏炭角菌菌丝体进行提取,测定不同溶剂提取物的总酚和总黄酮含量以及对DPPH自由基清除能力和总还原力。结果表明,不同溶剂提取物均具有不同程度的抗氧化活性。在各提取物浓度为2.5 mg/m L时,对DPPH自由基的清除率以水提物为最高(91.8%),其次为60%丙酮提取物和70%乙醇提取物,清除率分别为89.6%和83.6%,甲醇提取物的清除率最低(75.1%)。各溶剂提取物的还原能力强弱依次为:水60%乙醇70%乙醇60%丙酮甲醇。菌丝体水提物的总酚含量最高,而总黄酮含量最高的是甲醇提取物。总体而言,薛凡尼氏炭角菌菌丝体水提物具有较强的抗氧化活性,可能具有开发为食品抗氧化剂的潜力。     

覆盆子不同极性溶剂提取物的抗氧化活性比较

为比较覆盆子不同极性溶剂提取物的抗氧化活性,分别用正丁醇、乙酸乙酯、丙酮、去离子水、50%乙醇和石油醚进行萃取,测定各提取物总多酚和总黄酮的含量,并通过清除DPPH自由基、ABTS自由基、羟基自由基和总还原能力4种体系对其体外抗氧化活性进行评价。结果显示,乙酸乙酯提取物中总多酚含量最高,50%乙醇提取物中总黄酮含量最高;50%乙醇提取物清除DPPH自由基能力和ABTS自由基能力最强,水提取物清除羟基自由基能力最强,丙酮提取物总还原能力最强。结果表明覆盆子不同极性溶剂的提取物均有抗氧化活性,可作为天然抗氧化剂开发。     

不同溶剂提取对刺梨物质含量变化及抗氧化活性的影响

为探究不同极性的溶剂提取对刺梨物质含量变化及抗氧化活性的影响,分别以水、甲醇、60%乙醇、无水乙醇、正丁醇和乙酸乙酯为提取溶剂,通过测定提取物中抗坏血酸、总多酚、总黄酮、单宁和总三萜含量,采用体外抗氧化方法对刺梨不同溶剂提取物进行抗氧化活性测定,并采用抗氧化活性综合（antioxidant potency composite,APC）指数法进行比较分析。结果表明：60%乙醇提取物中总多酚、总黄酮、单宁和总三萜含量最高;水提取物中抗坏血酸含量最高;乙酸乙酯提取物中总多酚、总黄酮、抗坏血酸和总三萜含量最低;正丁醇提取物中单宁含量最低。对抗氧化活性而言,60%乙醇提取物清除DPPH 自由基与ABTS+自由基能力和还原力最强;甲醇提取物的羟基自由基清除率最高;乙酸乙酯提取物清除超氧阴离子自由基的能力最强。APC 指数显示,6 种溶剂提取物的抗氧化能力由强到弱依次为60%乙醇提取物＞甲醇提取物＞水提取物＞无水乙醇提取物＞乙酸乙酯提取物＞正丁醇提取物。由于不同活性成分之间存在协同或拮抗作用,且不同活性成分在不同溶剂中的溶解性不同,因此不同溶剂提取对刺梨活性物质含量和抗氧化活性影响较大。     

黑小麦麸皮抗氧化活性成分提取及其抗氧化能力评价

黑小麦麸皮是黑小麦加工过程中的副产物,其富含多种生理活性物质,包括花青素、酚酸类物质、膳食纤维等。以黑小麦麸皮为原料,利用不同溶剂对其抗氧化活性成分进行提取并对其抗氧化能力评价研究。结果表明,75%乙醇提取物干物质得率最高,为10.72%;50%乙醇提取总酚含量最高,为2.9 mg/100 mL;50%乙醇提取物对1,1-二苯基-2-三硝基苯肼（DPPH）清除力最强,75%乙醇提取物对DPPH抗氧化物提取能力最强;75%丙酮提取物对2,2′-联氮-双-3-乙基苯并噻唑啉-6-磺酸（ABTS）清除力最强,75%甲醇提取物对ABTS抗氧化物提取能力最强。综合比较得出,50%乙醇更适于黑小麦麸皮抗氧化活性成分提取。     

枣果渣不同溶剂提取物的抗氧化成分及性能研究

以枣果经榨汁后的枣渣为原料,研究枣渣不同溶剂(水、甲醇、乙醇和丙酮)提取物中抗氧化成分(总酚和总黄酮)的含量以及抗氧化性能(DPPH自由基清除性能,TEAC,RP)。研究结果表明,有机溶剂的种类、浓度对枣果渣提取物中的总酚、总黄酮含量以及抗氧化性能的影响是显著的;60%的丙酮成为最有效的枣果渣提取的溶剂,60%的甲醇和60%的乙醇能较好的提取枣渣中的抗氧化成分,提取物也表现出较高的抗氧化活性。     

马齿苋不同溶剂提取物的抗氧化活性

研究马齿苋不同溶剂提取物的抗氧化能力。以水、70%甲醇、70%乙醇和70%丙酮为提取溶剂,通过清除DPPH·、ABTS^+、·OH及FRAP法评价马齿苋不同溶剂提取物的抗氧化作用,并测定提取物的总多酚、总黄酮含量。结果表明,马齿苋不同溶剂提取物在4种抗氧化评价体系中均表现出一定的抗氧化活性, 70%丙酮提取物抗氧化活性最强,总多酚含量最高。70%丙酮可作为马齿苋抗氧化活性成分提取的优选溶剂,而总多酚含量可作为马齿苋抗氧化提取物的质量评价指标。     

洋葱皮不同溶剂提取物的体外抗氧化、抑制α-糖苷酶活性研究

研究不同溶剂对洋葱皮总多酚、总黄酮和槲皮素的提取效果及其提取物的抗氧化、抑制α-糖苷酶活性。以紫色洋葱皮为原料,分别以水、40%~100%乙醇溶液、乙酸乙酯、石油醚为溶剂提取洋葱皮活性成分,分析不同溶剂对总多酚、总黄酮及槲皮素的提取效果,测定不同溶剂提取物的总还原能力、清除DPPH·、ABTS+·、O₂-·能力及抑制α-糖苷酶活性,并分析提取物中总多酚、总黄酮及槲皮素含量与其生物活性的相关性。结果表明:60%乙醇对总多酚、总黄酮、槲皮素的提取效果最好,三种活性成分的提取率分别为5.5%、9.87%、3.25%,纯度分别达(33.12%±0.39%)、(59.44%±0.38%)、(19.56%±0.14%)。40%、60%乙醇提取物均具有较强总还原能力、清除DPPH·、ABTS+·、O₂-·能力和抑制α-糖苷酶活性能力。洋葱皮提取物总黄酮、槲皮素含量与其抗氧化、抑制α-糖苷酶活性的相关系数均达显著或极显著水平,其中,提取物的槲皮素含量与自由基清除活性、抑制α-糖苷酶活性相关性最高。     

发芽对2种青稞营养成分及抗氧化活性的影响

以隆子黑青稞和藏青2000为原料,通过测定芽长、淀粉、蛋白质、脂肪、纤维、总酚、总黄酮和抗氧化活力,探讨萌发对2种青稞营养成分及抗氧化活性的影响.结果 表明:未发芽青稞中,除淀粉含量外,隆子黑青稞的蛋白质、脂肪、纤维、总酚、总黄酮含量与抗氧化活性均大于藏青2000.发茅处理降低了青稞的淀粉、蛋白质、总酚含量和铁离子还原...     

Metal content of southern Italy honey of different botanical origins and its correlation with polyphenol content and antioxidant activity

Seventy‐eight samples of southern Italy honey from five different floral origins (chestnut, eucalyptus, citrus, multifloral and sulla) were screened to quantify the polyphenol and metal contents, evaluate the antioxidant activity and determine the correlations between the parameters analysed. The average polyphenol content was 12.06 mg gallic acid equivalent per 100 g honey and 7.92 mg quercetin equivalent per 100 g honey, for total phenolic and flavonoid contents, respectively. The antioxidant activity ranged from 58.40% (eucalyptus honey) to 60.42% (chestnut honey) in the ABTS assay, from 152.65 μm Fe (II) (citrus honey) to 881.34 μm Fe (II) (chestnut honey) in the FRAP assay, and from 54.29% (citrus honey) to 78.73% (chestnut honey) in the DPPH assay. Fe and Zn were the most abundant among the tested metals, while Cd, Co and Mo were those less present. Chestnut honey presented the highest polyphenol content, antioxidant activity and metal content. The correlations between the analysed parameters were statistically significant (P < 0.05). The correlations between metal content and both total phenolic and antioxidant activities were particularly interesting, suggesting a relationship between metal and polyphenol contents in honey.     

Effects of binary solvent extraction system,extraction time and extraction temperature on phenolic antioxidants and antioxidant capacity from mengkudu (Morinda citrifolia)

An investigation into the effects of ethanol concentration (0–100%, v/v), extraction time (20–120 min) and extraction temperature (25–65 °C) on the extraction of phenolic antioxidants from mengkudu (Morinda citrifolia) was performed using a single-factor experiment. Total phenolic content (TPC) and total flavonoid content (TFC) assays were used for determination of phenolic compounds. Antioxidant capacity was evaluated by measuring the scavenging effect on 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) and 2,2′-diphenyl-1-picrylhydrazyl (DPPH) radicals. Experimental results showed that extraction conditions had significant effect on extraction of phenolic compounds and antioxidant capacities. The optimised conditions were 40% ethanol for 80 min at 65 °C, with values of 919.95 mg GAE/100 g DW for TPC, 472.73 mg CE/100 g DW for TFC, 791.71 μmol TEAC/100 g DW for ABTS and 1928.5 μmol TEAC/100 g DW for DPPH. TPC was significantly correlated with DPPH under the effects of ethanol concentration (r = 0.932) and extraction time (r = −0.938).     

豆类种子及其芽苗菜的营养品质、功能性成分及抗氧化性研究

为阐明萌发对黑大豆(Glycine max)、红小豆(Vigna angularis)和豌豆(Pisum sativum L)的影响,研究了其种子及萌发后形成芽苗菜的生长特性(总质量、可食部分鲜重、可食率、苗长、含水量)、营养品质(粗蛋白和可溶性糖含量)、功能性成分(总酚、总黄酮含量)和抗氧化性(DPPH自由基清除力、ABTS自由基清除力、FRAP亚铁还原力)。结果表明,3个豆类种子中,黑大豆的营养品质、酚类含量和抗氧化性显著高于红小豆和豌豆。3个豆类芽苗菜以豌豆苗的总质量(12.83 g/10株)、苗长(16.02 cm)和含水量(93.82%)最高;黑大豆芽苗菜的可食部分鲜重(5.87 g/10株)和可食率(71.03%)最高;豌豆苗的可溶性糖含量(0.75 mg/g)、总黄酮含量(7.09 mg/g DW)最高;黑大豆芽苗菜的总酚含量(4.28 mg/g DW)最高、ABTS自由基清除力(110.39μmol/g DW)和FRAP亚铁还原力(75.52 mmol/g DW)最强。萌发显著降低了3个豆类的可溶性糖含量,提高了粗蛋白含量;黑大豆萌发以后酚类含量和抗氧化性显著降低,而红小豆和豌豆萌发后显著提高了其酚类含量和抗氧化性。此外,酚类含量与抗氧化性之间存在着显著的正相关性。因此,黑大豆种子、红小豆芽苗菜和豌豆芽苗菜具有较高的营养价值,含有丰富的酚类物质和抗氧化性。     

萌发处理对黑青稞活性成分组成及抗氧化能力的影响

为研究青稞萌发过程中活性成分和抗氧化能力的变化情况,以西藏黑青稞为原料,采用刚果红法、酶联免疫吸附法等方法测定了黑青稞萌发过程中子叶、种皮和胚根中活性成分和抗氧化能力的变化,并对活性成分和抗氧化能力进行了相关性分析.结果表明,萌发7d与萌发3d相比,子叶、种皮和胚根中 β-葡聚糖含量整体均呈下降趋势,分别下降了24.8...     

Antioxidant activities and phenolic compounds of pigmented rice bran extracts

This study was carried out to investigate the antioxidant activities and phenolic compounds of pigmented rice (black, red, and green rice) and brown rice brans. Antioxidant activity was determined by using 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical assay, 2,2-azino-bis-(3-ethylenebenzothiozoline-6-sulfonic acid) (ABTS) radical cation assay, reducing power, and chelating ability. Phenolic compounds were measured by using HPLC. Pigmented rice brans were extracted by using aqueous mixtures of acetone, ethanol, and methanol to determine the most effective extraction solvent. Of all solvents examined, extract from 40:60 acetone-water mixtures (v/v) provided the highest DPPH radical assay as well as the highest total phenolic and flavonoid content. We finally selected 40% acetone as an extraction solvent for antioxidant study of pigmented rice bran. Antioxidant activities of 40% acetone extracts of pigmented rice bran, measured in the range of 0 to 1500 μg/mL. At 500 μg/mL concentration, red rice bran, which had the highest total phenolic (259.5 μg/mg) and total flavonoid (187.4 μg/mg) contents, showed the highest antioxidant activity: 83.6%, 71.5%, 1.2%, and 16.4% for DPPH radical assay, ABTS radical cation assay, reducing power, and chelating ability, respectively. Red rice bran showed a lower EC(50) value (112.6 μg/mL) than that of butylated hydroxytoluene (144.5 μg/mL) from the DPPH radical assay. The major phenolic acids of red rice bran were ferulic, vanillic and p-coumaric acids. The results indicated pigmented rice bran might be used as a natural antioxidant. PRACTICAL APPLICATION: The present study revealed black and red rice bran shows high antioxidant activities and they contain high amount of phenolic compounds. Indeed, black and red rice bran could be better raw materials for manufacturing the food with high antioxidant activity.     

溶剂提取对青稞中不同形态多酚组成及抗氧化活性的影响

为研究不同极性溶剂对青稞全谷物中不同形态酚类化合物含量、组成及抗氧化性的影响,建立适宜于青稞全谷物中多酚提取的方法。以4?个不同品种青稞为原料,比较4?种不同溶剂及酸法、碱法分别对青稞中游离酚和结合酚含量、组成与抗氧化活性的影响。结果表明,所有提取试剂中80%丙酮溶液提取的游离态总酚含量（139.79～235.96?mg/100?g）及总黄酮含量（9.88～15.52?mg/100?g）最高,酸法提取的青稞结合态总酚含量是碱法的1.9～3.1?倍,结合态黄酮含量是碱法的1.3～2.9?倍;80%丙酮溶液提取物中检测到8～18?种青稞游离酚类化合物,且酚类化合物含量显著高于其他溶剂,绿原酸、苯甲酸、儿茶素、槲皮素、芦丁是其主要的游离酚类化合物。与碱法相比,酸法能释放出更多的结合酚类化合物类型及含量,没食子酸、p-香豆酸、丁香酸、苯甲酸、藜芦酸、橙皮苷是其主要的结合酚类化合物;参试青稞80%丙酮溶液提取物显示出最高的1,1-二苯基-2-三硝基苯肼（1,1-diphenyl-2-picrylhydrazyl,DPPH）自由基清除能力（852.56～1?484.18?μmol/100?g）,2,2’-联氮-双-（3-乙基苯并噻唑啉-6-磺酸）二铵盐（2,2’-azinobis-(3-ethylbenzthiazoline-6-sulphonate),ABTS）自由基清除能力（358.93～518.09?μmol/100?g）及铁离子还原能力（ferric ion reducing antioxidant power,FRAP）（1?250.55～2?041.16?μmol/100?g）。酸法水解参试青稞结合酚DPPH自由基清除能力、FRAP、ABTS＋?清除能力分别是碱法水解的7.6～10.3、1.2～1.8?倍和1.1～1.3?倍。因此,80%丙酮溶剂和酸法分别是青稞中游离酚与结合酚的适宜提取溶剂,且本研究表明青稞全谷物中富含丰富的酚类物质,是一种潜在的天然抗氧化剂来源。     

Evaluation of In vitro antioxidant properties of roasted hulled barley (Hordeum vulgare L.)

The antioxidant properties of roasted hulled barley (Hordeum vulgare L.) were tested using in vitro assays, including the total phenolic content (TPC), total flavonoid content (TFC), and DPPH, ABTS, and ferric reducing antioxidant power (FRAP) assays. Hulled barley was roasted at 0, 170, 210, and 250°C for 20 min. The effects of the aqueous heating time at 100°C from 0 to 60 min and the blending ratio of barley and water from 1:2 to 1:5 in aqueous solutions were evaluated. p-Coumaric and ferulic acid contents were analyzed. The highest antioxidant activities were observed in 250°C roasted samples, although the p-coumaric and ferulic acid contents were high at 210°C. The highest antioxidant capacity in aqueous solution was observed at 60 min of extraction and in samples with a 1:2 blending ratio.     

Chemical composition and antioxidant activity of Korean cactus (Opuntia humifusa) fruit

The chemical composition and antioxidant activities of the Korean cactus (Opuntia humifusa, OH) fruit were investigated in this study. Major minerals in the OH fruit were P, Ca, and Mg. Total dietary fiber content was 22.8% and the soluble dietary fiber/insoluble dietary fiber ratio was 1:1.3. An 80% ethanol extract was used to investigate antioxidant activities based on DPPH radical scavenging ability as well as total phenolic and flavonoid content. OH fruit extract from 80% ethanol was sequentially fractionated according to the polarity of solvents. Among various fractions, the ethyl acetate fraction showed the highest antioxidant activity as well as the highest total phenolic and total flavonoid contents compared to other fractions. The most abundant phenolic acid in the ethyl acetate fraction was ferulic acid, followed by protocatechuic acid. The most abundant flavonoid was taxifolin, followed by myricetin. The results suggested that OH fruit could be a good potential source of antioxidant.