金鸡菊提取物体外抗氧化活性

目的:探讨金鸡菊提取物体外抗氧化活性。方法:采用分光光度法,测定金鸡菊提取物对羟基(OH)自由基、超氧阴离子(O 2-.)自由基及1,1-二苯基-2-苦肼基自由基(DPPH)的清除能力,通过多元线性回归分析,考察金鸡菊提取物含量及其体外抗氧化活性的相关性,并同维生素(VC)进行了比较。结果:金鸡菊提取物对.OH自由基,O 2-.自由基,DPPH自由基均有较好的清除作用,在供试质量浓度范围内(0.2～1.0 g.L-1)对各自由基的清除效率与金鸡菊提取物浓度有一定量效关系,当质量浓度达1.0 g.L-1,其中50%乙醇洗脱物对OH自由基、O 2-.自由基和DPPH自由基的清除率可达86.19%,97.90%和71.85%,且清除能力与Vc相当。结论:金鸡菊提取物具有显著的体外抗氧化作用。     

杨梅核提取物的体外抗氧化活性研究

目的:考察杨梅核不同溶剂提取物的体外抗氧化活性。方法:采用分光光度法,测定杨梅核不同溶剂提取物对DPPH、脂质过氧化的清除能力和总还原力,考察了杨梅核提取物体外抗氧化活性。结果:杨梅核不同溶剂提取物具有较强的DPPH、脂质过氧化的清除能力和总还原力,其中杨梅核无水乙醇提取物的体外抗氧化作用最强。结论:杨梅核提取物具有显著的抗氧化活性。     

10种药用植物提取物抗氧化活性的研究

利用DPPH比色法,以VE为参数,测定比较10种药用植物甲醇提取物对DPPH自由基清除能力。结果表明在10种药用植物中岩白菜根茎提取物抗氧化活性最高,其自由基清除效率(SE)是VE的2倍,有望成为天然抗氧化剂的素材。     

酢浆草提取物体外抗氧化活性研究

目的:探讨酢浆草提取物体外抗氧化活性。方法:采用DPPH法、FRAP法分别测定酢浆草水提取物清除DPPH自由基和总的抗氧化能力。结果:在实验的测定浓度范围之内,随着提取物浓度的增加,其对DPPH自由基的清除能力逐渐增强。2mg/mL酢浆草水提物对DPPH自由基的清除率达到67.144%。FRAP法测得20mg/mL酢浆草水提取液的总抗氧化能力为1.09mM。结论:酢浆草对DPPH自由基的清除效果良好,FRAP法测得酢浆草有一定的抗氧化能力,有进一步开发利用的价值。     

谷精草提取物的抗氧化活性考察

目的:考察谷精草水提物和醇提物的抗氧化活性。方法:采用UV检测谷精草水提物和醇提物对超氧阴离子自由基、羟基自由基和DPPH自由基的清除能力,通过普鲁士法测定提取物还原Fe3+的能力,并以丁基羟基茴香醚(BHA)为参比测定提取物对金属离子(Fe2+)的螯合能力。结果:谷精草水提物和醇提物对3种自由基均具有较强的清除作用,水提物的半数抑制浓度(IC50)分别为1.389,3.507,0.341 g·L-1,醇提物的IC50分别为0.792,5.525,0.192 g·L-1。提取物对Fe3+有还原能力,对金属离子(Fe2+)有较强的螯合能力,且随着提取液质量浓度的增加而增强,呈剂量效应关系。结论:谷精草水提物和醇提物均具有较强的抗氧化活性,在相对低质量浓度下醇提物的抗氧化作用比水提物强。     

加热对葡萄籽提取物抗氧化活性的影响

〔英〕/Kim S Y…∥Food Chem.-2006,97(3).-472～479评价了葡萄籽原状和粉末状材料分别在50、100、150、200℃加热后,对其乙醇提取物(GSE)清除自由基活性(RSA)和还原能力的影响。葡萄籽清洗后晒干,取部分加工成均化的微粒状粉末。将葡萄籽和葡萄籽粉分别在50、100、150、200℃     

荞麦皮提取物抗氧化活性的研究

植物中普遍含有的酚类化合物具有抗氧化作用。荞麦在日本被认为是一种健康食品,主要成分为芦丁。每年消耗大量荞麦的     

宽叶缬草醚酯提取物体外抗氧化活性研究

目的 探讨缬草醚酯提取物体外抗氧化活性.方法 采用DPPH法、邻苯三酚自氧化法、水杨酸法,分别测定缬草醚酯提取物清除DPPH自由基、超氧阴离子自由基和羟自由基的能力.结果 样品中活性物质对于DPPH自由基、超氧阴离子自由基、羟自由基等自由基半清除率浓度(IC50)分别为1.36,1.46和2.14 mg/ml.结论 在实验条件下,缬草醚酯提取物对DPPH自由基、羟自由基、超氧阴离子有较好的抑制作用.     

贯叶连翘标准提取物体外抗氧化活性

贯叶连翘Hypericum perforatum L．为藤黄科金丝桃属植物，又名千层楼、圣约翰草等，地上部分或全草入药，其性平味涩，有清热解毒、收敛止血、利湿之功效。其主要成分有苯并二蒽酮类、黄酮类、挥发油类和间苯三酚类。贯叶连翘富含黄酮类化合物，高达11．7％，主要为金丝桃苷、槲皮素、槲皮苷及芦     

长白山新记录种款冬花提取物体外抗氧化活性研究(英文)

本文分析了长白山新记录种款冬的抗氧化活性。结果表明乙酸乙酯层和正丁醇层款冬提取物有很强的清除自由基和抑制邻苯三酚自氧化活性, 高效液相标定分析 3-咖啡酰奎尼酸, 3, 5-二咖啡酰奎尼酸是主要的抗氧化活性物质, 长白款冬花中 3, 5-二咖啡酰奎尼酸含量达 8.55%, 高于其他省份(0.51%), 这些数据表明长白款冬花是天然的抗氧化植物资源, 具有应用于食品药品产业的潜力。     

复方丹参的体外抗氧化活性研究

目的探讨复方丹参的体外抗氧化活性。方法采用DPPH自由基、超氧阴离子、羟基自由基、鳌合亚铁离子和还原力、过氧化氢的反应体系,检测了复方丹参的体外抗氧化活性,并与维生素C进行比较。结果复方丹参和维生素C消除DPPH自由基的EC50分别是41.0μg/mL和8.2μg/mL;复方丹参消除超氧阴离子自由基的EC50是1.39 m g/mL;复方丹参和维生素C抑制羟基自由基产生的EC50分别是1.73 m g/mL和0.58 m g/mL;在实验体系中,未检测到复方丹参螯合亚铁离子的能力;复方丹参和维生素C的还原能力的EC50分别是0.42 m g/mL和0.08 m g/mL。在实验最高质量浓度100μg/mL时,复方丹参和维生素C对过氧化氢的清除率分别为36%和94%。结论复方丹参具有较强还原力,能清除DPPH和超氧阴离子自由基的作用,并抑制羟基自由基的产生。复方丹参的多方面抗氧化活性可能是在治疗心血管疾病效果显著的原因之一。     

苦参提取物体外抗菌实验研究

目的：探讨苦参总生物碱、总黄酮提取物及其混合物的体外抗菌效果。方法：采用液体二倍稀释法分析苦参总生物碱、苦参总黄酮提取物及其混合物对金黄色葡萄球菌、大肠埃希菌、福氏志贺菌、乙型副伤寒杆菌、铜绿假单胞菌、白色葡萄球菌、痢疾杆菌和柠檬色葡萄球菌的抗菌作用,并测定最小抑菌浓度（MIC）和最小杀菌浓度（MBC）。结果：苦参总生物碱对以上菌株的MIC分别为：9.00、3.38、8.25、9.00、4.50、13.50、6.75、7.13mg.mL-1,MBC分别为：13.50、14.25、8.25、9.00、14.25、14.25、13.13、14.25mg.mL-1;苦参总黄酮对以上菌株的MIC分别为3.00、2.63、3.56、3.38、1.50、2.44、3.56、2.35mg.mL-1,MBC分别为14.25、12.75、7.13、13.50、13.50、12.75、12.75、13.13mg.mL-1;苦参总生物碱与总黄酮混合物对以上菌株的MIC分别为：2.25、2.07、3.28、3.94、1.22、2.44、2.07、1.97mg.mL-1,MBC分别为9.00、13.13、6.75、6.38、13.88、7.50、6.38、7.13mg.mL-1。结论：苦参总生物碱和总黄酮提取物对上述菌株存在体外抑菌和杀菌活性,混合物呈现一定协同作用。     

Investigation of in vitro antioxidant activity of dihydromyricetin and flavonoids rich extract from vine tea(Ampelopsis grossedentata)

Background:Vine tea from fermented Ampelopsis grossedentata leaves has been used as a herbal tea and folk medicine in the southern region of China for hundreds of years.The aim of this investigation was to analyze the total flavonoids found in vine tea,including three bioactive flavonoids,and the total phenolic contents in the aqueous methanol extracts of 10 vine tea samples.In addition,this study also aimed to examine the antioxidant activity of dihydromyricetin and vine tea’s flavonoid-rich extract.Methods:The total flavonoids and total phenolic content assay of extracts from vine tea were performed by ultraviolet-visible spectroscopy and epoch microplate spectrophotometer,respectively.Three bioactive flavonoids were quantified simultaneously using high performance liquid chromatography.The antioxidant activity of dihydromyricetin and vine tea’s flavonoid-rich extract was evaluated in vitro using six different methods.Results:Vine tea contained a large number of flavonoids,with dihydromyricetin as its main constituent.The flavonoid-rich extract exhibited a significant scavenging effect on superoxide anion radicals,and on 3-ethylbenzthiazoline-6-sulphonic acid and 1,1-diphenyl-2-picrylhydrazyl radicals.It also possessed definite activity in lipid peroxidation inhibition,ferric reduction,and the moderation of Fe2+ion chelation ability.There was a significant negative correlation between dihydromyricetin content and antioxidant activity in the vine tea samples,including superoxide anion radical scavenging activity(P=−0.754,P<0.05),lipid peroxidation inhibition activity(P=−0.759,P<0.05),ferric-reducing antioxidant power(P=−0.843,P<0.01),respectively.Dihydromyricetin played a dominant role in the antioxidant activities of the flavonoid-rich extract.Conclusion:Vine tea’s flavonoid-rich extract could be used as a new antioxidant source to safeguard against oxidative stress.     

In vitro and in vivo antioxidant potentials of an ethanolic extract of Ganoderma lucidum in rat mammary carcinogenesis

AIM： Considering the importance of diet in the prevention of cellular damage caused by reactive oxygen species which has been implicated for several diseases, this present study was undertaken to evaluvate the in vitro and in vivo antioxidant potential of the ethanolic extract of the fruiting bodies of Ganoderma lucidum on 7, 12-dimethylbenz（a）anthracene （DMBA）-induced mammary carcinogenesis in Sprague Dawley rats. METHODS： Ganoderrna lucidum extract was tested for in vitro antioxidant and radical scav- enging assays, such as （ABTS^-1） radical cation decolorization assay, DPPH radical scavenging, hydroxyl radical, and superoxide radical scavenging assays. The in vivo antioxidant potentials were analyzed by SOD, CAT, and GPx in plasma, mammary, and liver tissues. RESULTS： In all the in vitro antioxidant and radical scavenging assays the extract exhibited good scavenging activity. In vivo enzy- matic antioxidant levels, such as SOD, CAT, and GPx were decreased in DMBA-induced animals. Moreover, pretreatment with G. lucidum （500 mg.kg-1 bw） to DMBA-induced animals significantly （P 〈 0.05） increased the levels of SOD, CAT, and GPx in plasma, mammary, and liver tissues compared to DMBA induced animals. CONCLUSIONS： From these findings, it is suggested that G. lu- cidum extract could be considered as a potential source of natural antioxidants and can be used as an effective chemopreventive agent against mammary cancer.     

In vitro antioxidant activity of Anthriscus cerefolium L. (Hoffm.) extracts

Standardised aqueous extracts of chervil (Anthriscus cerefolium L. Hoffm.) (Apiacae) were investigated for antioxidant effect. Numerous in vitro test methods were used to determine whether the extracts, from different vegetative parts (root, herb) had H-donor, metal binding, reductive, free radical scavenging and membrane protective activity. Apiin was used as a reference material. The herb extract showed better activity in all experiments than the root extract. The present results underline that the wateric chervil extracts have antioxidant and anti-lipoperoxidant activity.     

In vitro antiplasmodial activity of extracts of Argentinian plants

Fifteen extracts from nine selected Argentine medicinal plants were tested for their antiplasmodial activity in vitro by assessing their ability to inhibit the uptake of [3H]-hypoxanthine into the Plasmodium falciparum K1 pyrimethamine/chloroquine resistant strain. The methanol extract of Satureja parvifolia showed good antiplasmodial activity (IC₅₀ 3 μg/ml). Inhibition of the growth of P. falciparum was also observed with aqueous extracts of Buddleja globosa and S. parvifolia.     

银杏叶黄酮类成分体外及经肠吸收后抗氧化活性比较

[目的]比较银杏叶提取物中三个主要的银杏黄酮苷元体外及经肠吸收后抗氧化活性。[方法]采用1,1-二苯基-2-三硝基苯肼(DPPH)法(1,1-二苯基-2-三硝基苯肼法)测定模型药物体外及肠吸收液对自由基的清除作用,测定药物的抗氧化活性。[结果]槲皮素、异鼠李素、山奈酚体外清除DPPH自由基的EC50分别为78.6μm,203.2μm,222.0μm;药物肠吸收液DPPH清除率趋势为:槲皮素异鼠李素山奈酚,其清除率较体外相比有所降低;3个单体不同配比的肠吸收液DPPH清除率显示以提取物中所含比例混合清除率数据高于其他两组。[结论]3个单体体外及肠吸收液均能够清除DPPH自由基,且清除能力为:槲皮素异鼠李素山奈酚;肠吸收后药物清除率下降,可能与单体在肠道中产生分解有关,其原因还需进一步探讨,3个单体以提取物所含比例混合后抗氧化活性要好。     

人面果叶子、根部、果实提取物体外抗氧化活性研究(英文)

目的:评价人面果叶子、根部、果实提取物体外抗氧化活性。方法:采用相应的实验体系测定总酚含量、还原能力、清除自由基能力、抑制DNA损伤作用,从而评价人面不同部位的石油醚提取物、乙酸乙酯提取物、正丁醇提取物、水提取物的抗氧化活性。结果:6个提取物显示抗氧化活性,其中叶子部位乙酸乙酯提取物的抗氧化活性与人工合成抗氧化剂BHT相当。结论:此次研究为从人面果中分离得到天然抗氧化剂提供理论基础。     

印度Anisochilus carnosus(L.F.)Wall.的体外自由基清除活性(英文)

AIM:To evaluate in vitro anti-oxidant potential of methanolic and aqueous extract of Indian habitants Anisochilus carnosus (L.F.) wall.,which is an annual shrub belonging to the family Lamiaceae commonly known asmint family.METHODS:The present study describes the effects by DPPH,alkaline DMSO,scavenging of ferric ion,NO,H 2 O 2,ABTS models.Both extracts showed good free radical scavenging property which was calculated as IC 50.RESULTS:IC 50 of aqueous and methanolic extracts were found to be 7.09 and 5.77 μ...