不同产地砂仁总酚测定及抗氧化活性比较

目的:建立砂仁总酚含量的快速测定方法,比较不同产地砂仁总酚的抗氧化活性,为砂仁药材资源的综合开发和品质评价提供理论基础。方法:以香草酸为对照品,采用福林酚比色法测定砂仁的总酚含量;通过DPPH法、ABTS法和FRAP法测定不同产地砂仁的抗氧化活性。结果:砂仁总酚含量测定的线性范围为0.002 0~0.011 9 mg·mL~(-1),平均加样回收率为96.6%(RSD=3.3%,n=6);3种方法测定的砂仁抗氧化活性均与总酚含量呈显著正相关(P0.01),相关系数分别为0.966,0.966和0.927。结论:本文建立的砂仁总酚含量测定方法简便、快速、重复性好;不同产地的砂仁均具有一定的抗氧化活性,总酚含量与产地具有一定的相关性。     

青天葵4种提取物抗氧化活性与其总黄酮和总酚含量的相关性

目的考察青天葵Nervilia fordii(Hance)Schltr.氯仿、乙酸乙酯、正丁醇、乙醇提取物抗氧化活性与其总黄酮和总酚含有量的相关性。方法 Al Cl3-HAc-Na Ac显色法和福林-酚比色法分别测定青天葵4种提取物中总黄酮和总酚含有量,通过测定DPPH自由基清除能力、羟自由基清除能力、ABTS自由基清除能力、还原能力评价提取物抗氧化活性,SPSS17.0软件分析抗氧化活性与2种成分含有量的相关性。结果青天葵4种提取物的抗氧化活性均呈量效关系,乙酸乙酯提取物最强,而乙醇提取物最弱。其与总黄酮含有量有一定相关性(0.604r0.638),与总酚含有量相关性显著(r0.977)。结论青天葵乙酸乙酯提取物可用于天然抗氧化剂开发,总酚含有量是影响其抗氧化活性的主要因素。     

宣肺止嗽合剂中总黄酮、总酚含量测定及其抗氧化活性研究

目的 测定宣肺止嗽合剂中总黄酮、总酚含量,并考察其抗氧化活性。方法 以芦丁为对照品,采用氯化铝比色法测定总黄酮含量;以没食子酸为对照品,采用普鲁士蓝比色法测定总酚含量。再测定DPPH、ABTS、PTIO自由基清除活性,进行FRAP实验。结果 芦丁在46.72～280.32μg范围内线性关系良好(r=0.999 6),总黄酮含量为2.14 mg/mL;没食子酸在8.93～22.32μg范围内线性关系良好(r=0.999 4),总酚含量为4.06 mg/mL。该制剂清除DPPH、ABTS、PTIO自由基的IC₅₀分别为1.68、0.54、40μL/mL,每1 mL样品抗氧化能力相当于5.85 mg FeSO₄。结论 宣肺止嗽合剂富含黄酮类、多酚类成分,并具有较强的抗氧化活性。     

窝儿七不同提取物中总黄酮总酚含量及其抗氧化活性的研究

目的:研究窝儿七不同提取物的抗氧化活性与其总黄酮和总酚含量的相关性。方法:采用NaNO_2-Al(NO_3)_3-NaOH显色法和Folin-Ciocalteu比色法分别测定窝儿七药材5种提取物中总黄酮和总酚的含量,并用DDPH自由基清除能力、羟自由基清除能力、ABTS自由基清除能力、还原能力以及T-AOC总抗氧化能力方法,评价不同提取物的抗氧化活性。结果:正丁醇提取物中总黄酮含量最高,为45.62 mg/g,乙酸乙酯的总黄酮含量也较高,乙酸乙酯提取物中总酚含量最高,为106.05 mg/g。窝儿七的五种提取物的总黄酮、总酚含量与抗氧化活性有一定的相关性,其DDPH自由基清除能力为乙酸乙酯>正丁醇>70%乙醇>水>氯仿。ABTS自由基清除能力为乙酸乙酯>70%乙醇>正丁醇>氯仿>水。羟自由基清除能为乙酸乙酯>正丁醇>70%乙醇>氯仿>水。还原能力为乙酸乙酯>70%乙醇>氯仿>正丁醇>水。总抗氧化能力(T-AOC)为乙酸乙酯>正丁醇>70%乙醇>水>氯仿。结论:窝儿七的乙酸乙酯提取物最多,抗氧化活性最强,乙酸乙酯可作为抗氧化活性物质提取的最佳溶剂,为窝儿七综合开发提供实验依据,也为其抗氧化研究提供参考。     

不同产地五味子质量评价及抗氧化活性研究

目的:测定辽宁省不同产地五味子果实中木脂素、粗多糖及总酚这3类化合物的含量,评价不同产地五味子质量和抗氧化活性。方法:采用反相高效液相色谱法测定五味子醇甲、五味子甲素及五味子乙素的含量。采用Folin-Cicalteu's法、苯酚硫酸法、DPPH.法,分别测定不同产地五味子果实的总酚含量、粗多糖含量及自由基清除率。结果:五味子样品中3种木脂素总含量最高的采自辽阳市(21.75 mg/g);沈阳市沈北新区样品粗多糖含量最高(88.72 mg/g);总酚含量和自由基清除率最高的是来源于本溪市关门山的样品,分别为104.24 mg/g和86.3%。线性关系表明,总酚含量与自由基清除率的相关性高于总木脂素含量与自由基清除率的相关性。不同产地五味子的总酚含量和总木脂素含量分别与自由基清除率的线性回归方程为Y=1.3677X+46.97,R2=0.6869和Y=2.5916X+57.927,R2=0.1747。结论:辽宁省不同产地五味子果实中木脂素、总酚和粗多糖的含量有显著差异;五味子中主要的抗氧化成分为总酚类化合物,而木脂素类化合物与自由基清除率无明显相关。     

黄芩不同极性溶剂提取物抗氧化活性研究

目的比较黄芩不同溶剂提取物的抗氧化活性,并测定其黄酮含量。方法利用比色法测定黄芩不同溶剂提取物中的总黄酮含量,利用1,1-二苯基-2-苦苯肼(DPPH)自由基体系对黄芩不同溶剂提取物的抗氧化活性进行评价。结果黄芩不同溶剂提取物均具有一定的抗氧化活性,其中乙醇提取物清除DPPH自由基的能力最强,且总黄酮含量最高。结论黄芩的抗氧化活性受到不同溶剂的影响,并且与其含的黄酮含量成正相关。     

甘青青兰生品和炒制品总黄酮、总多酚含量及其2,2-二苯基-1-苦肼基自由基清除能力比较

目的比较甘青青兰生品和炒制品中总黄酮、总多酚含量的差异及其清除2,2-二苯基-1-苦肼基(DPPH)自由基能力,探讨生、炒甘青青兰中有效成分含量和抗氧化活性之间的关系。方法分别以75%乙醇为溶媒采用冷浸法对甘青青兰生品和炒制品进行提取,采用NaNO2-Al(NO3)3-NaOH法和Folin-Ciocalteu法分别测定其提取物中总黄酮和总多酚含量,采用DPPH自由基清除法评价其提取物的抗氧化能力。结果甘青青兰生品中总黄酮含量(6.442%)炒制品(7.929%);甘青青兰生品中总多酚含量(4.132%)≈炒制品(4.136%);甘青青兰生品自由基半数清除率浓度(0.847)炒制品(0.628),甘青青兰生品自由基清除效率(1181.335)炒制品(1592.357)。结论甘青青兰抗氧化活性成分可能为酚酸类和黄酮类化合物,其总黄酮和总多酚含量与其抗氧化活性有一定相关性。     

不同产地酸藤子根总黄酮含量及抗氧化活性研究

目的:测定不同产地酸藤子根总黄酮含量及评价其体外抗氧化活性与总黄酮含量的相关性。方法:选用广西、广东11种不同产地酸藤子,采用超声提取法对酸藤子根总黄酮进行提取,选用紫外分光光度法测定其总黄酮含量;通过测定酸藤子根总黄酮的总抗氧化能力以及清除1,1-二苯基-2-三硝基苯肼(DPPH)自由基的能力来评价酸藤子根体外抗氧化活性。结果:不同产地酸藤子根总黄酮含量有较大的差异,其中,总黄酮含量最高的是潮州市饶平县,最低的是南宁市青秀区。不同产地酸藤子根黄酮溶液显示出一定的总抗氧化能力,且能够有效清除DPPH自由基。结论:酸藤子根具有良好的抗氧化能力,其总黄酮含量与清除DPPH自由基能力有着紧密的相关性。     

乌龙茶茶褐素提取工艺的优化及抗氧化研究

以乌龙茶为原料,研究了不同因素对乌龙茶茶褐素得率的影响,测定了茶褐素中蛋白质、总糖、总酚及总黄酮的含量,同时初步探讨了茶褐素的抗氧化活性。结果表明,各因素对茶褐素得率的影响依次为:提取次数>提取时间>提取温度>料液比;最佳提取工艺为,料液比1:10,提取次数3次,提取温度70℃,提取时间20 min,在此条件下,茶褐素得率为9.23%。茶褐素主要成分为蛋白质(21.47%)、糖(28.28%)和总酚(11.19%)。抗氧化活性结果表明,乌龙茶茶褐素对羟自由基、超氧阴离子自由基、DPPH自由基均具有一定的清除效果,且随着浓度的增大清除率增加。     

猴腿蹄盖蕨总酚和鞣质含量及抗氧化活性评价

目的：测定猴腿蹄盖蕨根茎总酚、鞣质含量评价及其抗氧化活性。方法采用福林酚试剂-干酪素比色法测定猴腿蹄盖蕨根茎总酚和鞣质含量,利用分光光度法测定其体外抗氧化活性。结果猴腿蹄盖蕨根茎总酚含量为24.61%,鞣质含量为4.59%,总酚和鞣质具有强还原能力以及羟自由基和超氧阴离子自由基清除活性。结论猴腿蹄盖蕨根茎总酚及鞣质具有显著的抗氧化活性。     

不同采摘期连翘叶中总黄酮、总酚酸含量与 DPPH自由基清除能力的相关性

目的:研究不同采摘时期连翘叶的总黄酮、总酚酸含量的变化及其与清除2,2-二苯基-1-苦肼基自由基(2,2-diphenyl-1-picrylhydrazyl,DPPH)能力的关系。方法:连翘叶样品粉末脱脂后用60%甲醇超声波提取。采用DPPH自由基清除法评价不同采摘时期连翘叶的抗氧化能力。样品粗提取物总黄酮含量的测定采用亚硝酸钠法,总酚酸含量的测定采用Folin试剂法。采用SPSS 13.0分析软件对数据进行统计学处理。结果:不同采摘时期连翘叶的总黄酮、总酚酸含量以及清除DPPH自由基的能力存在着显著的差异;3月采摘的刚萌发幼叶表现出最高的总黄酮、总酚酸含量以及清除DPPH自由基的能力。相关性研究表明,连翘叶的总黄酮、总酚酸含量与清除DPPH自由基能力均存在显著正相关关系,其相关系数分别为0.886,0.841。结论:3月连翘叶的抗氧化能力和抗氧化物质含量都显著高于其他生长时期连翘叶,这显示从抗氧化方面而言连翘嫩叶刚萌发的时期是最佳的采摘时期,为较好的开发和利用连翘叶提供了理论依据。     

In vitro antioxidant and free radical scavenging activity of Nardostachys jatamansi DC

In this study, the antioxidative potential of a hydroalcoholic extract of Nardostachys jatamansi (NJE) rhizomes was evaluated by various antioxidant assays, including antioxidant capacity by the phosphomolybdenum method, total antioxidant activity in linoleic acid emulsion systems, 1,1-diphenyl-2-picrylhydrazyl (DPPH), superoxide, hydroxyl radicals, nitric oxide (NO) scavenging, metal chelating and reducing power activity. These various antioxidant activities were compared with standard antioxidants such as butylated hydroxytoluene, tocopherol, catechin, and L-ascorbic acid. Total phenolic and flavonoid content of NJE was also determined by a colorimetric method. The extract exhibited high reduction capability and powerful free radical scavenging, especially against DPPH and superoxide anions as well as a moderate effect on NO. Moreover, the peroxidation inhibiting activity of NJE was demonstrated in the linoleic acid emulsion system. The results obtained in the present study clearly established the antioxidative potency of NJE, which may account for some of the medical claims attributed to this plant.     

两种蚂蚁巢甲醇提取物的自由基清除及抗菌活性研究

对两种不同的蚂蚁窝进行甲醇提取,并对提取物进行了急性毒性、抗自由基,酚含量、还原能力和抗菌活性的检测.二苯基三硝基肼(1,1-diphenyl-2-picrylhydrazyl ,DPPH)自由基的清除能力的检测表明两种蚂蚁窝甲醇提取物都具有显著的自由基清除能力,并呈现出剂量依赖性,而且,在高浓度时(5～10 mg·mL-1),它们的自由基清除能力甚至显著地高于二丁基羟基甲苯(butylated hydroxyl toluene,BHT).酚的含量和还原能力分别用福林酚试剂和铁氰化钾还原反应来测定,统计分析显示两种蚂蚁窝的抗氧化能力和其酚含量、还原能力都存在着正相关.两种蚂蚁窝甲醇提取物都具有抗革兰氏阴性菌和革兰氏阳性菌的活性,但它们却对真菌没有作用.     

In vitro Antioxidant Activities of Methanol and Aqueous Extract of Annona squamosa (L.) Fruit Pulp

The present study evaluated the antioxidant activity of the fruit of Annona squamosa by means of in vitro studies involving two different solvent extracts: methanol and aqueous. The antioxidant properties of the extract were determined by scavenging 1, 1-diphenyl-2-picrylhydrazyl radical (DPPH), lipid peroxidation (LPO), nitric oxide (NO), superoxide anion (O₂^?), hydroxyl radical (OH^?), reducing power and total antioxidant. The results showed that, compared to aqueous extract, a methanolic fruit extract of A squamosa has a higher percentage of inhibition of DPPH radical scavenging activity (97.99%), LPO (94.15%), NO scavenging activity (70.96%), O₂^? scavenging activity and OH^? scavenging activity (78.68% and 85.25%, respectively), total antioxidant activity (206 μg α-tocopherol/g) and reducing power (56.0 μg of ascorbic acid/g). The results obtained in the in vitro models clearly suggest that methanol extract has higher antioxidant activity than the aqueous extract due to a higher presence of phenolic and flavonodal constituents in the methanol extract.     

Chemical compositions, anti-inflammatory, antiproliferative and radical-scavenging activities of Actinidia callosa var. ephippioides

Oxidative stress and inflammation are related to several chronic diseases including cancer. Actinidia callosa var. ephippioides (ACE) is a special folk medicinal plant from Taiwan. The aim of this study is to evaluate the antioxidant, anti-inflammatory, and antiproliferative activities of the methanol extract and fractions from the stem of ACE. Trolox Equivalent Antioxidant Capacity (TEAC), 1,1-Diphenyl-2-picrylhydrazyl (DPPH) scavenging activity, total phenolic content, flavonoid content, inhibition on nitric oxide (NO) productions by LPS-induced RAW264.7 cell, and on lung cancer cell proliferation were employed. Among all fractions, ethyl-acetate fraction (EA-ACE) showed higher TEAC, DPPH radical scavenging activities, polyphenol and flavonoid contents, respectively. EA-ACE also decreased the LPS-induced NO production and expressions of inducible nitric-oxide synthase (iNOS) in RAW264.7 cells. EA-ACE had the highest antiproliferative activity with an IC(50) (The concentrations required for inhibition of 50% of cell viability) of 469.17 ± 3.59 μg/mL. Catechin also had good effects in the antioxidant and anti-inflammatory activities. Catechin might be an important bioactive compound in the stem of ACE. The above experimental data indicated that the stem of ACE is a potent antioxidant medicinal plant, and such efficacy may be mainly attributed to its polyphenolic compounds.     

玄参中多酚类化合物的抗氧化活性研究

目的 采用超声法分别以不同提取时间、不同浓度乙醇水溶液和不同极性提取溶剂对玄参中多酚类化合物进行提取.方法 采用Folin-Ciocalteu方法测定玄参不同提取物的总多酚含量,并通过DPPH抗氧化活性体外评价体系测定玄参不同提取物的抗氧化活性、清除自由基的能力.结果 40%乙醇提取物的总多酚含量最高,而20%乙醇提取物具有最好的清除DPPH自由基的能力.结论玄参中多酚类化合物具有较好的体外抗氧化活性.     

In vitro and in vivo antihypertensive and antioxidant activities of fermented roots of Allium hookeri

Objective: To evaluate antihypertensive and antioxidant activities of Allium hookeri root (AHR) fermented with Lactobacillus plantarum, Leuconostoc mesenteroides, and Weissella cibaria. Methods: The novel fermented AHR products using L. plantarum, L. mesenteroides, and W. cibaria were developed and ACE inhibitory activity, DPPH radical scavenging activity, hydroxyl radical scavenging activity, superoxide anion radical scavenging activity, total phenolic content, and total thiosulfinate content were determined. The antihypertensive and antioxidant effects of fermented AHR were further investigated in spontaneously hypertensive rats (SHRs). Results: Administration of fermented AHR to SHRs had an attenuating effect on both diastolic and systolic blood pressure. The SHRs treated with fermented AHR showed lower plasma ACE activity and higher plasma NO levels. Furthermore, fermented AHR administration led to parallel improvements in plasma oxidative stress biomarkers in SHRs. Conclusion: Our results highlight the potential usefulness of fermented AHR for the prevention of hypertension.     

Antioxidant, anti-inflammatory and antiproliferative activities of Kalanchoe gracilis (L.) DC stem

Oxidative stress and inflammation are related to several chronic diseases including cancer and atherosclerosis. Kalanchoe gracilis (L.) DC is a special folk medicinal plant in Taiwan. The aim of this study was to evaluate the antioxidant, anti-inflammatory and antiproliferative activities of the methanolic extract and fractions of the stem of K. gracilis. TEAC, total phenolic compound content, total flavonoid content, DPPH radical scavenging activity, reducing power, inhibition of NO production in LPS-induced RAW264.7 cells, and inhibition of cancer cell proliferation were analyzed. Among all fractions, the chloroform fraction showed the highest TEAC and DPPH radical scavenging activities. The chloroform fraction also had the highest content of polyphenols and flavonoids. Chloroform fractions also decreased LPS-induced NO production and expressions of iNOS and COX-2 in RAW264.7 cells. The antiproliferative activities of the methanolic extract and fractions were studied in vitro using HepG2 cells, and the results were consistent with their antioxidant capacities. Chloroform fractions had the highest antiproliferative activity with an IC(50) of 136.85 ± 2.32 μg/ml. Eupafolin also had good pharmacological activity in the antioxidant, anti-inflammation and antiproliferative. Eupafolin might be an important bioactive compound in the stem of K. gracilis. The above experimental data indicated that the stem of K. gracilis is a potent antioxidant medicinal plant, and such efficacy may be mainly attributed to its polyphenolic compounds.     

Antioxidant, anti-inflammatory, and antiproliferative activities of Taxillus sutchuenensis

Inflammation is related to several chronic diseases, including cancer and atherosclerosis. Taxillus sutchuenensis (Lecomte) Danser is a special folk medicinal plant in Taiwan. The aim of this study was to evaluate the antioxidant, anti-inflammatory, and antiproliferative activities of the aqueous-thanol extract from T. sutchuenensis (AETS) and its fractions. TEAC, DPPH radicals, total phenolic compounds, total flavonoid content, inhibition of NO production in LPS-induced RAW264.7 cells, and inhibition of cancer cell proliferation were tested. Among all fractions, the ethyl-acetate (EA) fraction showed the highest TEAC and DPPH radical scavenging activities. The EA fraction also had the highest polyphenol and flavonoid content. The EA fractions also decreased LPS-induced NO production and the expression of iNOS and COX-2 in RAW264.7 cells. The antiproliferative activities of the aqueous/ethanol extract and fractions were studied in vitro using A549 cells, and the results were consistent with their antioxidant capacities. EA fractions had the highest antiproliferative activity with an IC(50) of 454.38 ± 1.48 μg/ml. Quercetin also had antioxidant, anti-inflammatory, and antiproliferative activities. Quercetin might be an important bioactive compound in T. sutchuenensis. The experimental data indicated that T. sutchuenensis is a potent antioxidant medicinal plant, and such efficacy may be mainly attributed to its polyphenolic compounds.     

土三七总酚酸抗氧化活性的研究

目的：探讨土三七总酚酸抗氧化活性。方法：在测定土三七中总酚酸的含量基础上,选用还原力、DPPH自由基清除率和多不饱和脂肪酸（PUFA）过氧化体系对不同浓度提取液进行体外抗氧化活性评价,同时以VC为阳性对照。结果：土三七总酚酸含量越高,其抗氧化活性越强,其中还原性和DPPH清除能力低于VC,而对PUFA过氧化体系的抑制效果则比vc的活性更强。结论：土三七总酚酸抗氧化活性与浓度呈正相关性,表明其抗氧化活性与酚酸类物质有关。